US4782810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system for internal combustion engine
Assignee: Mazda Motor Corp
•
Filing: 1987-09-09
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Granted: 1988-11-08
•
Expires: 2007-09-09
Abstract
Abstract A fuel injection system for an internal combustion engine having the normal crankshaft and plurality of cylinders each with an intake passage and an exhaust passage. An intake stroke detector is provided for detecting if a particular cylinder of the engine is experiencing an intake stroke. Responsive to an intake stroke being detected, a fuel injector is actuated to inject fuel into the intake passage of the particular cylinder during its intake stroke. The engine is equipped with an exhaust gas recirculation system for recirculating a part of exhaust gases from the exhaust passage to the intake passage of each cylinder. A fuel injection timing control mechanism is provided for advancing the fuel injection timing responsive to operation of the exhaust gas recirculation system to control the fuel injection period relative to the intake stroke.
Inventors
- 👤 Shigeaki Shimoda
- 👤 Tatsuya Tomii
- 👤 Yasunori Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:38
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/0065; F02D41/0072; F02D41/30; F02D41/32; F02D41/34; F02D41/345; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
164 words
A fuel injection system for an internal combustion engine comprising: (a) an engine having a crankshaft and a plurality of cylinders each with an intake passage and an exhaust passage; (b) intake stroke detecting means for detecting if a cylinder of said engine is experiencing an intake stroke; (c) fuel injection means actuated responsive to said intake stroke detecting means for injecting fuel into the intake passage of said cylinder during intake stroke of said cylinder; (d) exhaust gas recirculation means for recirculating a part of exhaust gases from the exhaust passage to the intake passage of said cylinder; and (e) fuel injection timing control means for advancing fuel injection timing responsive to operation of said exhaust gas recirculation means to control the fuel injection period relative to the intake stroke, said fuel injection timing control means starting fuel injection during intake stroke when said exhaust gas recirculation means is not operating, and before intake stroke when said exhaust gas recirculation means is operating.
Claim 2
Dependent Claim
164 words
A fuel injection system for an internal combustion engine comprising: (a) an engine having a crankshaft and a plurality of cylinders each with an intake passage and an exhaust passage; (b) intake stroke detecting means for detecting if a cylinder of said engine is experiencing an intake stroke; (c) fuel injection means actuated responsive to said intake stroke detecting means for injecting fuel into the intake passage of said cylinder during intake stroke of said cylinder; (d) exhaust gas recirculation means for recirculating a part of exhaust gases from the exhaust passage to the intake passage of said cylinder; and (e) fuel injection timing control means for advancing fuel injection timing responsive to operation of said exhaust gas recirculation means to control the fuel injection period relative to the intake stroke, said fuel injection timing control means starting fuel injection during intake stroke when said exhaust gas recirculation means is not operating, and before intake stroke when said exhaust gas recirculation means is operating.
Claim 3
Dependent Claim
42 words
A fuel injection system for an internal combustion engine as defined in claim 1 in which said exhaust gas recirculation means includes an EGR valve and said fuel injection timing control means is actuated responsive to the position of said EGR valve.
Claim 4
Dependent Claim
36 words
A fuel injection system for an internal combustion engine as defined in claim I in which said fuel injection timing control means provides a maximum advance of about 150° before top dead center of the crankshaft.
Claim 5
Dependent Claim
51 words
A fuel injection system for an internal combustion engine as defined in claim 1 in which said fuel injection timing control means determines the advance of fuel injection timing on the basis of the ratio of the amount of actual exhaust gas recirculation and a limit amount of exhaust gas recirculation.
Claim 6
Dependent Claim
39 words
A fuel injection system for an internal combustion engine according to claim 1 in which said fuel injection timing control means starts fuel injection at a predetermined advance before intake stroke when said exhaust gas recirculation means is operating.
Claim 7
Dependent Claim
151 words
A fuel injection system for an internal combustion engine comprising: (a) an engine having a crankshaft and a plurality of cylinders each with an intake passage and an exhaust passage; (b) intake stroke detecting means for detecting if a cylinder of said engine is experiencing an intake stroke; (c) fuel injection means actuated responsive to said intake stroke detecting means for injecting fuel into the intake passage of said cylinder during intake stroke of said cylinder; (d) exhaust gas recirculation means for recirculating a part of exhaust gases from the exhaust passage to the intake passage of said cylinder; and (e) fuel injection timing control means for advancing fuel injection timing responsive to operation of said exhaust gas recirculation means to control the fuel injection period relative to the intake stroke, said fuel injection timing control means providing a maximum advance of about 150° before top dead center of the crankshaft.
Claim 8
Dependent Claim
151 words
A fuel injection system for an internal combustion engine comprising: (a) an engine having a crankshaft and a plurality of cylinders each with an intake passage and an exhaust passage; (b) intake stroke detecting means for detecting if a cylinder of said engine is experiencing an intake stroke; (c) fuel injection means actuated responsive to said intake stroke detecting means for injecting fuel into the intake passage of said cylinder during intake stroke of said cylinder; (d) exhaust gas recirculation means for recirculating a part of exhaust gases from the exhaust passage to the intake passage of said cylinder; and (e) fuel injection timing control means for advancing fuel injection timing responsive to operation of said exhaust gas recirculation means to control the fuel injection period relative to the intake stroke, said fuel injection timing control means providing a maximum advance of about 150° before top dead center of the crankshaft.
Claim 9
Dependent Claim
49 words
A fuel injection system for an internal combustion engine as defined in claim 6 in which said fuel injection timing control means starts fuel injection during intake stroke when said exhaust gas recirculation means is not operating, and before intake stroke when said exhaust gas recirculation means is operating.
Claim 10
Dependent Claim
51 words
A fuel injection system for an internal combustion engine as defined in claim 6 in which said fuel injection timing control means determines the advance of fuel injection timing on the basis of the ratio of the amount of actual exhaust gas recirculation and a limit amount of exhaust gas recirculation.
Claim 11
Dependent Claim
39 words
A fuel injection system for an internal combustion engine according to claim 6 in which said fuel injection timing control means starts fuel injection at a predetermined advance before intake stroke when said exhaust gas recirculation means is operating.
Claim 12
Dependent Claim
42 words
A fuel injection system for an internal combustion engine as defined in claim 6 in which said exhaust gas recirculation means includes an EGR valve and said fuel injection timing control means is actuated responsive to the position of said EGR valve.
Claim 13
Dependent Claim
166 words
A fuel injection system for an internal combustion engine comprising: (a) an engine having a crankshaft and a plurality of cylinders each with an intake passage and an exhaust passage; (b) intake stroke detecting means for detecting if a cylinder of said engine is experiencing an intake stroke; (c) fuel injection means actuated responsive to said intake stroke detecting means for injecting fuel into the intake passage of said cylinder during intake stroke of said cylinder; (d) exhaust gas recirculation means for recirculating a part of exhaust gases from the exhaust passage to the intake passage of said cylinder; and (e) fuel injection timing control means for advancing fuel injection timing responsive to operation of said exhaust gas recirculation means to control the fuel injection period relative to the intake stroke, said fuel injection timing control means determining the advance of fuel injection timing on the basis of the ratio of the amount of actual exhaust gas recirculation and a limit amount of exhaust gas recirculation.
Claim 14
Dependent Claim
166 words
A fuel injection system for an internal combustion engine comprising: (a) an engine having a crankshaft and a plurality of cylinders each with an intake passage and an exhaust passage; (b) intake stroke detecting means for detecting if a cylinder of said engine is experiencing an intake stroke; (c) fuel injection means actuated responsive to said intake stroke detecting means for injecting fuel into the intake passage of said cylinder during intake stroke of said cylinder; (d) exhaust gas recirculation means for recirculating a part of exhaust gases from the exhaust passage to the intake passage of said cylinder; and (e) fuel injection timing control means for advancing fuel injection timing responsive to operation of said exhaust gas recirculation means to control the fuel injection period relative to the intake stroke, said fuel injection timing control means determining the advance of fuel injection timing on the basis of the ratio of the amount of actual exhaust gas recirculation and a limit amount of exhaust gas recirculation.
Claim 15
Dependent Claim
49 words
A fuel injection system for an internal combustion engine as defined in claim 11 in which said fuel injection timing control means starts fuel injection during intake stroke when said exhaust gas recirculation means is not operating, and before intake stroke when said exhaust gas recirculation means is operating.
Claim 16
Dependent Claim
36 words
A fuel injection system for an internal combustion engine as defined in claim 11 in which said fuel injection timing control means provides a maximum advance of about 150° before top dead center of the crankshaft.
Claim 17
Dependent Claim
39 words
A fuel injection system for an internal combustion engine according to claim 11 in which said fuel injection timing control means starts fuel injection at a predetermined advance before intake stroke when said exhaust gas recirculation means is operating.
Claim 18
Dependent Claim
42 words
A fuel injection system for an internal combustion engine as defined in claim 11 in which said exhaust gas recirculation means includes an EGR valve and said fuel injection timing control means is actuated responsive to the position of said EGR valve.
Claim 19
Dependent Claim
168 words
A fuel injection system for an internal combustion engine comprising: (a) an engine having a crankshaft and a plurality of cylinders each with an intake passage and an exhaust passage; (b) intake stroke detecting means for detecting if a cylinder of said engine is experiencing as intake stroke; (c) fuel injection means actuated responsive to said intake stroke detecting means for injecting fuel into the intake passage of said cylinder during intake stroke of said cylinder; (d) exhaust gas recirculation means for recirculating a part of exhaust gases from the exhaust passage to the intake passage of said cylinder; and (e) fuel injection timing control means for advancing fuel injection timing responsive to operation of said exhaust gas recirculation means to control the fuel injection period relative to the intake stroke, said fuel injection timing control means starting fuel injection at a predetermined advance before intake stroke when said exhaust gas recirculation means is operating and relative to fuel injection when exhaust gas recirculation means is not operating.
Claim 20
Dependent Claim
168 words
A fuel injection system for an internal combustion engine comprising: (a) an engine having a crankshaft and a plurality of cylinders each with an intake passage and an exhaust passage; (b) intake stroke detecting means for detecting if a cylinder of said engine is experiencing as intake stroke; (c) fuel injection means actuated responsive to said intake stroke detecting means for injecting fuel into the intake passage of said cylinder during intake stroke of said cylinder; (d) exhaust gas recirculation means for recirculating a part of exhaust gases from the exhaust passage to the intake passage of said cylinder; and (e) fuel injection timing control means for advancing fuel injection timing responsive to operation of said exhaust gas recirculation means to control the fuel injection period relative to the intake stroke, said fuel injection timing control means starting fuel injection at a predetermined advance before intake stroke when said exhaust gas recirculation means is operating and relative to fuel injection when exhaust gas recirculation means is not operating.
Claim 21
Dependent Claim
42 words
A fuel injection system for an internal combustion engine as defined in claim 16 in which said exhaust gas recirculation means includes an EGR valve and said fuel injection timing control means is actuated responsive to the position of said EGR valve.
Claim 22
Dependent Claim
36 words
A fuel injection system for an internal combustion engine as defined in claim 16 in which said fuel injection timing control means provides a maximum advance of about 150° before top dead center of the crankshaft.
Claim 23
Dependent Claim
51 words
A fuel injection system for an internal combustion engine as defined in claim 16 in which said fuel injection timing control means determines the advance of fuel injection timing on the basis of the ratio of the amount of actual exhaust gas recirculation and a limit amount of exhaust gas recirculation.
Claim 24
Dependent Claim
49 words
A fuel injection system for an internal combustion engine as defined in claim 16 in which said fuel injection timing control means starts fuel injection during intake stroke when said exhaust gas recirculation means is not operating, and before intake stroke when said exhaust gas recirculation means is operating.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |