US5146899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel control system for injected engine
Assignee: Yamaha Motor Co Ltd
•
Filing: 1991-09-25
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Granted: 1992-09-15
•
Expires: 2011-09-25
Abstract
Abstract A fuel injection control system for a two cycle crankcase compression internal combustion engine that employs two sensors for sensing engine load. One of the sensor, a throttle valve position sensor, is more sensitive at low speed and low load conditions and the other of the sensor, a crankcase pressure sensor, is more sensitive under high speed and high load conditions. The output of the fuel injectors is controlled by a map ratio showing the input signals from the two sensors in response to their areas of greatest selectivity.
Inventors
- 👤 Takeshi Tanaka
- 👤 Kunio Kajiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:52
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/26; F02D41/28; F02D41/02; F02D41/18; F02D41/30; F02D41/32; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/12; F02B2075/125; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1808; F02D2400/00; F02D2400/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 61
Claim 1
Independent Claim
103 words
A fuel control system for an internal combustion engine operating over a range of speed and load conditions, a first sensor for sensing a certain engine condition, a second sensor for sensing a certain engine condition, said first sensor being more accurate in certain portions of the engine range than said second sensor is in that range portion, and control means for receiving input signals from said first and said second sensors for controlling the amount of fuel delivered to said engine, said control means being more responsive to the input signal from said first sensor when operating in the certain range portion.
Claim 2
Dependent Claim
103 words
A fuel control system for an internal combustion engine operating over a range of speed and load conditions, a first sensor for sensing a certain engine condition, a second sensor for sensing a certain engine condition, said first sensor being more accurate in certain portions of the engine range than said second sensor is in that range portion, and control means for receiving input signals from said first and said second sensors for controlling the amount of fuel delivered to said engine, said control means being more responsive to the input signal from said first sensor when operating in the certain range portion.
Claim 3
Dependent Claim
50 words
A fuel control system as set forth in claim 1 wherein the second sensor is more accurate in a second certain portion of the engine range than the first sensor and wherein the control means is more responsive to the input from said second sensor in said second range portion.
Claim 4
Dependent Claim
27 words
A fuel control system as set forth in claim 1 wherein the control means is responsive under all conditions to the signals from both of the sensors.
Claim 5
Dependent Claim
50 words
A fuel control system as set forth in claim 3 wherein the second sensor is more accurate in a second certain portion of the engine range than the first sensor and wherein the control means is more responsive to the input from said second sensor in said second range portion.
Claim 6
Dependent Claim
20 words
A fuel control system as set forth in claim 4 wherein both of the sensors sense the same engine condition.
Claim 7
Dependent Claim
17 words
A fuel control system as set forth in claim 5 wherein the sensed engine condition is load.
Claim 8
Dependent Claim
20 words
A fuel control system as set forth in claim 6 wherein the first sensor senses load by throttle valve position.
Claim 9
Dependent Claim
25 words
A fuel control system as set forth in claim 6 wherein the second sensor senses load by pressure in the induction system of the engine.
Claim 10
Dependent Claim
29 words
A fuel control system as set forth in claim 8 wherein the engine operates on a two cycle crankcase compression principal and the sensed pressure is crankcase chamber pressure.
Claim 11
Dependent Claim
20 words
A fuel control system as set forth in claim 9 wherein the first sensor senses load by throttle valve position.
Claim 12
Dependent Claim
20 words
A fuel control system as set forth in claim 1 wherein both of the sensors sense the same engine condition.
Claim 13
Dependent Claim
20 words
A fuel control system as set forth in claim 11 wherein the first sensor senses load by throttle valve position.
Claim 14
Dependent Claim
25 words
A fuel control system as set forth in claim 12 wherein the throttle position sensor is more sensitive in the low speed low load condition.
Claim 15
Dependent Claim
25 words
A fuel control system as set forth in claim 11 wherein the second sensor senses load by pressure in the induction system of the engine.
Claim 16
Dependent Claim
29 words
A fuel control system as set forth in claim 14 wherein the engine operates on a two cycle crankcase compression principal and the sensed pressure is crankcase chamber pressure.
Claim 17
Dependent Claim
25 words
A fuel control system as set forth in claim 15 wherein the crankcase pressure sensor is more sensitive in the high load high speed ranges.
Claim 18
Dependent Claim
20 words
A fuel control system as set forth in claim 6 wherein the first sensor senses load by throttle valve position.
Claim 19
Dependent Claim
25 words
A fuel control system as set forth in claim 17 wherein the throttle position sensor is more sensitive in the low speed low load condition.
Claim 20
Dependent Claim
20 words
A fuel control system as set forth in claim 1 wherein the fuel control system is a fuel injection system.
Claim 21
Dependent Claim
24 words
A fuel control system as set forth in claim 19 wherein the amount of fuel is controlled by controlling the duration of fuel injection.
Claim 22
Dependent Claim
20 words
A fuel control system as set forth in claim 20 wherein the first sensor senses load by throttle valve position.
Claim 23
Dependent Claim
25 words
A fuel control system as set forth in claim 21 wherein the throttle position sensor is more sensitive in the low speed low load condition.
Claim 24
Dependent Claim
25 words
A fuel control system as set forth in claim 20 wherein the second sensor senses load by pressure in the induction system of the engine.
Claim 25
Dependent Claim
29 words
A fuel control system as set forth in claim 23 wherein the engine operates on a two cycle crankcase compression principal and the sensed pressure is crankcase chamber pressure.
Claim 26
Dependent Claim
25 words
A fuel control system as set forth in claim 24 wherein the crankcase pressure sensor is more sensitive in the high load high speed ranges.
Claim 27
Dependent Claim
20 words
A fuel control system as set forth in claim 25 wherein the first sensor senses load by throttle valve position.
Claim 28
Dependent Claim
25 words
A fuel control system as set forth in claim 26 wherein the throttle position sensor is more sensitive in the low speed low load condition.
Claim 29
Dependent Claim
46 words
A fuel control system as set forth in claim 1 wherein there is further provided means for checking the operating characteristics of one of the sensors and controlling the fuel solely by the other of the sensors when the one sensor is determined to be malfunctioning.
Claim 30
Dependent Claim
41 words
A fuel control system as set forth in claim 28 wherein the operating condition of each of the sensors is checked and control is maintained by the other of the sensors when one of the sensors is deemed to be malfunctioning.
Claim 31
Dependent Claim
46 words
A fuel control system as set forth in claim 11 wherein there is further provided means for checking the operating characteristics of one of the sensors and controlling the fuel solely by the other of the sensors when the one sensor is determined to be malfunctioning.
Claim 32
Independent Claim
113 words
A method of fuel control system for an internal combustion engine operating over a range of speed and load conditions, the engine having a first sensor for sensing a certain engine condition, and a second sensor for sensing a certain engine condition, the first sensor being more accurate in certain portions of the engine range than said second sensor is in that range portion, said method comprising the steps of receiving input signals from the first and said second sensors for controlling the amount of fuel delivered to said engine, proportioning the fuel in a rate more responsive to the input signal from the first sensor when operating in the certain range portion.
Claim 33
Independent Claim
113 words
A method of fuel control system for an internal combustion engine operating over a range of speed and load conditions, the engine having a first sensor for sensing a certain engine condition, and a second sensor for sensing a certain engine condition, the first sensor being more accurate in certain portions of the engine range than said second sensor is in that range portion, said method comprising the steps of receiving input signals from the first and said second sensors for controlling the amount of fuel delivered to said engine, proportioning the fuel in a rate more responsive to the input signal from the first sensor when operating in the certain range portion.
Claim 34
Dependent Claim
52 words
A method of fuel control system as set forth in claim 31 wherein the second sensor is more accurate in a second certain portion of the engine range than the first sensor and wherein the proportioning rate is more responsive to the input from said second sensor in said second range portion.
Claim 35
Dependent Claim
28 words
A method of fuel control system as set forth in claim 31 wherein the control is responsive under all conditions to the signals from both of the sensors.
Claim 36
Dependent Claim
52 words
A method of fuel control system as set forth in claim 33 wherein the second sensor is more accurate in a second certain portion of the engine range than the first sensor and wherein the fuel proportion is more responsive to the input from the second sensor in the second range portion.
Claim 37
Dependent Claim
22 words
A method of fuel control system as set forth in claim 34 wherein both of the sensors sense the same engine condition.
Claim 38
Dependent Claim
19 words
A method of fuel control system as set forth in claim 35 wherein the sensed engine condition is load.
Claim 39
Dependent Claim
22 words
A method of fuel control system as set forth in claim 36 wherein the first sensor senses load by throttle valve position.
Claim 40
Dependent Claim
27 words
A method of fuel control system as set forth in claim 37 wherein the second sensor senses load by pressure in the induction system of the engine.
Claim 41
Dependent Claim
31 words
A method of fuel control system as set forth in claim 38 wherein the engine operates on a two cycle crankcase compression principal and the sensed pressure is crankcase chamber pressure.
Claim 42
Dependent Claim
22 words
A method of fuel control system as set forth in claim 39 wherein the first sensor senses load by throttle valve position.
Claim 43
Dependent Claim
22 words
A method of fuel control system as set forth in claim 31 wherein both of the sensors sense the same engine condition.
Claim 44
Dependent Claim
22 words
A method of fuel control system as set forth in claim 41 wherein the first sensor senses load by throttle valve position.
Claim 45
Dependent Claim
27 words
A method of fuel control system as set forth in claim 42 wherein the throttle position sensor is more sensitive in the low speed low load condition.
Claim 46
Dependent Claim
27 words
A method of fuel control system as set forth in claim 41 wherein the second sensor senses load by pressure in the induction system of the engine.
Claim 47
Dependent Claim
31 words
A method of fuel control system as set forth in claim 44 wherein the engine operates on a two cycle crankcase compression principal and the sensed pressure is crankcase chamber pressure.
Claim 48
Dependent Claim
27 words
A method of fuel control system as set forth in claim 45 wherein the crankcase pressure sensor is more sensitive in the high load high speed ranges.
Claim 49
Dependent Claim
22 words
A method of fuel control system as set forth in claim 46 wherein the first sensor senses load by throttle valve position.
Claim 50
Dependent Claim
27 words
A method of fuel control system as set forth in claim 47 wherein the throttle position sensor is more sensitive in the low speed low load condition.
Claim 51
Dependent Claim
22 words
A method of fuel control system as set forth in claim 31 wherein the fuel control system is a fuel injection system.
Claim 52
Dependent Claim
26 words
A method of fuel control system as set forth in claim 49 wherein the amount of fuel is controlled by controlling the duration of fuel injection.
Claim 53
Dependent Claim
22 words
A method of fuel control system as set forth in claim 50 wherein the first sensor senses load by throttle valve position.
Claim 54
Dependent Claim
27 words
A method of fuel control system as set forth in claim 51 wherein the throttle position sensor is more sensitive in the low speed low load condition.
Claim 55
Dependent Claim
27 words
A method of fuel control system as set forth in claim 50 wherein the second sensor senses load by pressure in the induction system of the engine.
Claim 56
Dependent Claim
31 words
A method of fuel control system as set forth in claim 53 wherein the engine operates on a two cycle crankcase compression principal and the sensed pressure is crankcase chamber pressure.
Claim 57
Dependent Claim
27 words
A method of fuel control system as set forth in claim 54 wherein the crankcase pressure sensor is more sensitive in the high load high speed ranges.
Claim 58
Dependent Claim
22 words
A method of fuel control system as set forth in claim 55 wherein the first sensor senses load by throttle valve position.
Claim 59
Dependent Claim
27 words
A method of fuel control system as set forth in claim 56 wherein the throttle position sensor is more sensitive in the low speed low load condition.
Claim 60
Dependent Claim
45 words
A method of fuel control system as set forth in claim 31 further including the step of testing the operation of one of the sensors and controlling the fuel only by the other of the sensors when the one sensor is tested to be defective.
Claim 61
Dependent Claim
40 words
A method of fuel control system as set forth in claim 58 wherein the operation of each of the sensors is tested and control is by the other of the sensors when one of the sensors is tested as defective.
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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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |