US6044642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct fuel injection engine
Assignee: Mazda Motor Corp
•
Filing: 1998-01-28
•
Granted: 2000-04-04
•
Expires: 2018-01-28
Abstract
Abstract A direct injection engine including, an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature senisor for detecting a coolant temperature condition of the catalyst, a control unit, for receiving signals from the sensor to determine that the catalyst is lower than an activation temperature when the engine coolant temperature is lower than a predetermined value, for calculating a fuel injection timing and fuel injection amount from the injector to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion as mixture having a theoretical air fuel ratio and a fuel lean combustion as mixture leaner than the combustion as mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture when it is determined that the temperature of the catalyst is lower than an activation temperature, and, for producing signals to the injector to inject the fuel at the fuel injection timing. The emission performance of the exhaust gas is improved. The warming up of the catalyst as well as the engine is facilitated.
Inventors
- 👤 Hirofumi Nishimura
- 👤 Hiroyuki Yamashita
- 👤 Youichi Kuji
- 👤 Noriyuki Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:51
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F02P5/1506; F02M; F02M69/00; F02D; F02D41/00; F02D41/02; F02D41/021; F02D41/0235; F02D41/024; F02D41/30; F02D41/3011; F02D41/3017; F02D41/3023; F02D41/38; F02D41/40; F02D41/402; F02B; F02B75/00; F02B75/12; F02B2075/125; F02D2041/389; F02D41/3029; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
161 words
A direct injection engine comprising: an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion has mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surround said area of the fuel rich combustion gas mixture by means of the injector just before an ignition timing so that the air fuel ratio of the combustion gas mixture in the combustion chamber is of substantially the theoretical one as a whole when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means.
Claim 2
Dependent Claim
161 words
A direct injection engine comprising: an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion has mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surround said area of the fuel rich combustion gas mixture by means of the injector just before an ignition timing so that the air fuel ratio of the combustion gas mixture in the combustion chamber is of substantially the theoretical one as a whole when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means.
Claim 3
Dependent Claim
127 words
A direct injection engine as recited in claim 1 wherein the fuel supply means is actuated to form the fuel rich combustion as mixture around the ignition plug equivalent to or richer than the combustion gas mixture having the theoretical air fuel ratio by injection the fuel from the injector in a compression stroke when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means and to form a fuel lean combustion gas mixture leaner than said combustion as mixture of the theoretical air fuel ratio in said area surround said area of the fuel rich combustion gas mixture another fuel supply which is executed at a timing before said fuel injection to the compression stroke.
Claim 4
Dependent Claim
42 words
A direct injection engine as recited in claim 2 wherein the fuel supply means executes a separate injection in which the fuel is injected from the injector directly into the combustion chamber in both an intake stroke and compression combustion stroke respectively.
Claim 5
Dependent Claim
52 words
A direct injection engine as recited in claim 1 wherein the temperature condition judging means infers the temperature of the catalyst based on an engine coolant temperature to determine that the temperature of the catalyst is lower than the activation temperature when the engine coolant temperature is lower than a predetermined value.
Claim 6
Dependent Claim
54 words
A direct injection engine as recited claim 1 wherein the fuel supply means is actuated to form the fuel rich combustion gas mixture around the ignition plug and a fuel lean combustion gas mixture in the area surrounding said area of the fuel rich combustion gas mixture after an engine starting operation is completed.
Claim 7
Dependent Claim
155 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion, as mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion, as mixture leaner than the combustion as mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector just before an ignition timing so that the air fuel ratio of the combustion gas mixture in the combustion chamber is of substantially the theoretical one as a whole when the engine is in a cold condition.
Claim 8
Dependent Claim
155 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion, as mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion, as mixture leaner than the combustion as mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector just before an ignition timing so that the air fuel ratio of the combustion gas mixture in the combustion chamber is of substantially the theoretical one as a whole when the engine is in a cold condition.
Claim 9
Dependent Claim
128 words
A direct injection engine as recited in claim 6 wherein the fuel supply means is actuated to form the fuel rich combustion gas mixture around the ignition plug equivalent to or richer than the combustion gas mixture having the theoretical air fuel ratio by injecting the fuel from the injector in a compression stroke when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means and to form a fuel lean combustion gas mixture leaner than said combustion gas mixture of the theoretical air fuel ratio in said area surrounding said area of the fuel rich combustion gas mixture by another fuel supply which is executed at a timing before said fuel injection in the compression stroke.
Claim 10
Dependent Claim
41 words
A direct injection engine as recited in claim 7 wherein the fuel supply means executes a separate injection in which the fuel is injected from the injector directly into the combustion chamber in both an intake stroke and compresssion stroke respectively.
Claim 11
Dependent Claim
32 words
A direct injection engine as recited in claim 7 wherein it is determined that the engine is in the cold condition when an engine coolant temperature is lower than a predetermined value.
Claim 12
Dependent Claim
54 words
A direct injection engine as recited claim 6 wherein the fuel supply means is actuated to form the fuel rich combustion gas mixture around the ignition plug and a fuel lean combustion gas mixture in the area surrounding said area of the fuel rich combustion gas mixture after an engine starting operation is completed.
Claim 13
Dependent Claim
269 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means, the fuel supply means being actuated to form the fuel rich combustion gas mixture around the ignition plug equivalent to or richer than the combustion gas mixture having the theoretical air fuel ratio by injecting the fuel from the injector in a compression stroke when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means and to form a fuel lean combustion gas mixture leaner than said combustion gas mixture of the theoretical air fuel ratio in said area surrounding said area of the fuel rich combustion gas mixture by another fuel supply, and, a fuel injection rate being determined such that an injection fuel amount in the intake stroke is greater than that in the compression stroke.
Claim 14
Dependent Claim
269 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means, the fuel supply means being actuated to form the fuel rich combustion gas mixture around the ignition plug equivalent to or richer than the combustion gas mixture having the theoretical air fuel ratio by injecting the fuel from the injector in a compression stroke when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means and to form a fuel lean combustion gas mixture leaner than said combustion gas mixture of the theoretical air fuel ratio in said area surrounding said area of the fuel rich combustion gas mixture by another fuel supply, and, a fuel injection rate being determined such that an injection fuel amount in the intake stroke is greater than that in the compression stroke.
Claim 15
Dependent Claim
54 words
A direct injection engine as recited claim 11 wherein the fuel supply means is actuated to form the fuel rich combustion gas mixture around the ignition plug and a fuel lean combustion gas mixture in the area surrounding said area of the fuel rich combustion gas mixture after an engine starting operation is completed.
Claim 16
Dependent Claim
30 words
A direct injection engine as recited claim 11 wherein the fuel being injected from the injector directly into the combustion chamber in both an intake stroke and combustion stroke respectively.
Claim 17
Dependent Claim
289 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means, the fuel supply means being actuated to form the fuel rich combustion gas mixture around the ignition plug equivalent to or richer than the combustion gas mixture having the theoretical air fuel ratio by injecting the fuel from the injector in a compression stroke when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means and to form a fuel lean combustion gas mixture leaner than said combustion gas mixture of the theoretical air fuel ratio in said area surrounding said area of the fuel rich combustion gas mixture by another fuel supply, a fuel injection rate being determined such that an injection fuel amount in the intake stroke is greater than that in the compression stroke, and, the injection rate of the fuel injection amount in the intake stroke is increased as an engine load is increased.
Claim 18
Dependent Claim
289 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means, the fuel supply means being actuated to form the fuel rich combustion gas mixture around the ignition plug equivalent to or richer than the combustion gas mixture having the theoretical air fuel ratio by injecting the fuel from the injector in a compression stroke when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means and to form a fuel lean combustion gas mixture leaner than said combustion gas mixture of the theoretical air fuel ratio in said area surrounding said area of the fuel rich combustion gas mixture by another fuel supply, a fuel injection rate being determined such that an injection fuel amount in the intake stroke is greater than that in the compression stroke, and, the injection rate of the fuel injection amount in the intake stroke is increased as an engine load is increased.
Claim 19
Dependent Claim
54 words
A direct injection engine as recited claim 14 wherein the fuel supply means is actuated to form the fuel rich combustion gas mixture around the ignition plug and a fuel lean combustion gas mixture in the area surrounding said area of the fuel rich combustion gas mixture after an engine starting operation is completed.
Claim 20
Dependent Claim
218 words
A direct injection engine comprising; all ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having theoretical air fuel ratio including an excessive fuel not to be combusted at an initial combustion stage in the combustion chamber and a fuel lean combustion gas mixture layer that the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture so as to reduce the combustion speed at a mean combustion stage following the initial combustion stage by means of the injector just before an ignition timing so that the air fuel ratio of the combustion gas mixture in the combustion chamber is of substantially the theoretical one as a whole when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means, whereby the excessive fuel is combusted in an late combustion stage following the main combustion stage.
Claim 21
Dependent Claim
218 words
A direct injection engine comprising; all ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means for forming a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having theoretical air fuel ratio including an excessive fuel not to be combusted at an initial combustion stage in the combustion chamber and a fuel lean combustion gas mixture layer that the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture so as to reduce the combustion speed at a mean combustion stage following the initial combustion stage by means of the injector just before an ignition timing so that the air fuel ratio of the combustion gas mixture in the combustion chamber is of substantially the theoretical one as a whole when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means, whereby the excessive fuel is combusted in an late combustion stage following the main combustion stage.
Claim 22
Dependent Claim
127 words
A direct injection engine as recited in claim 16, wherein the fuel supply means is actuated to form the fuel rich combustion gas mixture around the ignition plug equivalent to or richer than the combustion gas mixture having the theoretical air fuel ratio by injecting the fuel from the injector in a compression stroke when the temperature of the catalyst is lower than activation temperature based on the judgment of the temperature condition judging means and to form a fuel lean combustion gas mixture leaner than said combustion gas mixture of the theoretical air fuel ratio in said area surrounding said area of the fuel rich combustion gas mixture by another fuel supply which is executed at a timing before said fuel injection in the compression stroke.
Claim 23
Dependent Claim
41 words
A direct injection engine as recited in claim 17 wherein the fuel supply means executes a separate injection in which the fuel is injected from the injector directly into the combustion chamber in both an intake stroke and compression stroke respectively.
Claim 24
Dependent Claim
52 words
A direct injection engine as recited in claim 18 wherein the temperature condition judging means infers the temperature of the catalyst based on an engine coolant temperature to determine that the temperature of the catalyst is lower than the activation temperature when the engine coolant temperature is lower than a predetermined value.
Claim 25
Dependent Claim
54 words
A direct injection engine as recited claim 16 wherein the fuel supply means is actuated to form the fuel rich combustion gas mixture around the ignition plug and a fuel lean combustion gas mixture in the area surrounding said area of the fuel rich combustion gas mixture after an engine starting operation is completed.
Claim 26
Dependent Claim
213 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature sensor for detecting a coolant temperature condition of the catalyst, a control unit; for receiving signals from the sensor to determine that the catalyst is lower than an activation temperature when the engine coolant temperature is lower than a predetermined value, for calculating a fuel injection timing and fuel injection amount from the injector to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture just before an ignition timing so that the air fuel ratio of the combustion as mixture in the combustion chamber is of substantially the theoretical one as a whole when it is determined that the temperature of the catalyst is lower than an activation temperature, and for producing signals to the injector to inject the fuel at the fuel injection timing.
Claim 27
Dependent Claim
213 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature sensor for detecting a coolant temperature condition of the catalyst, a control unit; for receiving signals from the sensor to determine that the catalyst is lower than an activation temperature when the engine coolant temperature is lower than a predetermined value, for calculating a fuel injection timing and fuel injection amount from the injector to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture just before an ignition timing so that the air fuel ratio of the combustion as mixture in the combustion chamber is of substantially the theoretical one as a whole when it is determined that the temperature of the catalyst is lower than an activation temperature, and for producing signals to the injector to inject the fuel at the fuel injection timing.
Claim 28
Dependent Claim
211 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, A temperature sensor for detecting a coolant temperature condition of the catalyst, a control unit; for receiving signals from the sensor to determine that the catalyst is lower than an activating temperature when the engine coolant temperature is lower than a predetermined value, for calculating a first fuel injection timing in a compression stroke and first fuel injection amount from the injector to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and calculating a second fuel injection timing in an intake stroke and second fuel injection amount from the injector to form a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture when it is determined that the temperature of the catalyst is lower than all activation temperature, and for producing signals to the injector to inject the fuel at the fuel injection timings respectively.
Claim 29
Dependent Claim
211 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, A temperature sensor for detecting a coolant temperature condition of the catalyst, a control unit; for receiving signals from the sensor to determine that the catalyst is lower than an activating temperature when the engine coolant temperature is lower than a predetermined value, for calculating a first fuel injection timing in a compression stroke and first fuel injection amount from the injector to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and calculating a second fuel injection timing in an intake stroke and second fuel injection amount from the injector to form a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture when it is determined that the temperature of the catalyst is lower than all activation temperature, and for producing signals to the injector to inject the fuel at the fuel injection timings respectively.
Claim 30
Dependent Claim
38 words
A direct injection engine as recited in claim 22 wherein a total amount of the first and second fuel injections provide a combustion gas mixture having the theoretical air fuel ratio in the combustion chamber as a whole.
Claim 31
Dependent Claim
175 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber an injector for injecting a fuel directly into the combustion chamber a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means which executes a separate injection in which the fuel is injected from the injector directly into the combustion chamber in both an intake stroke and compression stroke respectively so as to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector just before an ignition timing when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means.
Claim 32
Dependent Claim
175 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber an injector for injecting a fuel directly into the combustion chamber a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means which executes a separate injection in which the fuel is injected from the injector directly into the combustion chamber in both an intake stroke and compression stroke respectively so as to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector just before an ignition timing when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means.
Claim 33
Dependent Claim
34 words
A direct injection engine as recited in claim 24 wherein a fuel injection rate is determined such that an injection fuel amount in the intake stroke is greater than that in the compression stroke.
Claim 34
Dependent Claim
31 words
A direct injection engine as recited in claim 24 wherein the fuel injection rate of the fuel injection amount in the intake stroke is increased as an engine load is increased.
Claim 35
Dependent Claim
54 words
A direct injection engine as recited in claim 24 further comprising an ignition timing control means for retarding the ignition timing from a base ignition timing when the separate injection is executed in the case where the catalyst is in a cold condition in which the catalyst temperature is lower than the activation temperature.
Claim 36
Dependent Claim
59 words
A direct injection engine as recited in claim 27 wherein the ignition timing is retarded in a very low engine load condition and in the cold condition of the catalyst, and wherein the separate injection is executed with an increased supply of an amount of air and fuel which is greater than those corresponding to an engine operating condition.
Claim 37
Dependent Claim
46 words
A direct injection engine as recited in claim 28 wherein the retardation of the ignition timing and the increased supply of the air and fuel is canceled when the engine load is increased from the very low engine load condition to a predetermined engine load condition.
Claim 38
Dependent Claim
24 words
A direct injection engine as recited in claim 27 wherein the retardation of the ignition timing is reduced when a running condition is established.
Claim 39
Dependent Claim
48 words
A direct injection engine as recited in claim 24 wherein the separate injection is executed where the catalyst is in a cold condition where the catalyst temperature is lower than the activation temperature, and wherein only an intake stroke injection is executed after the catalyst is warmed up.
Claim 40
Dependent Claim
23 words
A direct injection engine as recited in claim 31 wherein only a compression stroke injection is executed after the engine is warmed up.
Claim 41
Dependent Claim
48 words
A direct injection engine as recited in claim 24 wherein the separate injection is executed where the catalyst is in a cold condition where the catalyst temperature is lower than the activation temperature, and wherein only a compression stroke injection is executed after the catalyst is warmed up.
Claim 42
Dependent Claim
23 words
A direct injection engine as recited in claim 24 wherein the compression stroke injection is executed in a range of BTDC 50°-60° CA.
Claim 43
Dependent Claim
24 words
A direct injection engine as recited in claim 24 wherein the intake stroke injection is executed in a range of ATDC 70° 20° CA.
Claim 44
Dependent Claim
53 words
A direct injection engine as recited in claim 24 wherein a cavity of a concave configuration is formed on a top portion of a piston which partly define the combustion chamber so that an injected fuel through the compression stroke injection is reflected on the cavity surface to stay around the ignition plug.
Claim 45
Dependent Claim
161 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means which executes a separate injection in which the fuel is injected from the injector directly into the combustion chamber in both an intake stroke and compression stroke respectively so as to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector just before an ignition timing when the engine is in a cold condition.
Claim 46
Dependent Claim
161 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel supply means which executes a separate injection in which the fuel is injected from the injector directly into the combustion chamber in both an intake stroke and compression stroke respectively so as to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture by means of the injector just before an ignition timing when the engine is in a cold condition.
Claim 47
Dependent Claim
224 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel slipply means executes a separate injection in which the fuel is injected form the injector directly into the combustion chamber in both all intake stroke and combustion stroke respectively so as to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio including an excessive fuel not to be combusted at an initial combustion stage in the combustion chamber and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture so as to reduce the combustion speed at a main combustion stage following the initial combustion stage by means of the injector just before an ignition timing when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means, whereby the excessive fuel is combusted in a late combustion stage following the main combustion stage.
Claim 48
Dependent Claim
224 words
A direct injection engine comprising; an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature condition judging means for judging a temperature condition of the catalyst, a fuel slipply means executes a separate injection in which the fuel is injected form the injector directly into the combustion chamber in both all intake stroke and combustion stroke respectively so as to form a fuel rich combustion gas mixture around the ignition plug equivalent to or richer than a combustion gas mixture having a theoretical air fuel ratio including an excessive fuel not to be combusted at an initial combustion stage in the combustion chamber and a fuel lean combustion gas mixture leaner than the combustion gas mixture having the theoretical air fuel ratio in an area surrounding said area of the fuel rich combustion gas mixture so as to reduce the combustion speed at a main combustion stage following the initial combustion stage by means of the injector just before an ignition timing when the temperature of the catalyst is lower than an activation temperature based on the judgment of the temperature condition judging means, whereby the excessive fuel is combusted in a late combustion stage following the main combustion stage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-04 | 2003-10-04 | 2004-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-04 | 2007-10-04 | 2008-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-04 | 2011-10-04 | 2012-04-04 | $7700.00 | Window Closed / Lapsed |