US5492102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of throttle fuel lean-out for internal combustion engines
Assignee: FCA US LLC
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Filing: 1994-05-04
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Granted: 1996-02-20
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Expires: 2014-05-04
Abstract
Abstract A method of throttle fuel lean-out for an internal combustion engine including the steps of sensing a throttle position of a throttle for the engine with a throttle position sensor, calculating a delta throttle value based on the sensed throttle position, determining whether the engine is in a throttle deceleration condition based on the calculated delta throttle value, linearizing the change in throttle position with respect to absolute throttle position and engine speed if the engine is in a throttle deceleration condition, calculating a throttle deceleration fuel lean-out multiplier value based on the linearized change in throttle position, and applying the calculated throttle deceleration fuel lean-out multiplier value to a fuel pulsewidth value of fuel injectors for the engine and reducing the amount of fuel injected into the engine by the fuel injectors.
Inventors
- 👤 Christopher P. Thomas
- 👤 Gregory T. Weber
- 👤 Glen E. Tallarek
- 👤 Gregory J. Dykstra
- 👤 Joseph B. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:38
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/12; F02D41/045
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 words
A method of throttle fuel lean-out for an internal combustion engine, said method comprising the steps of: sensing a throttle position of a throttle for the engine with a throttle position sensor; calculating a delta throttle value based on the sensed throttle position; determining whether the engine is in a throttle deceleration condition based on the calculated delta throttle value; linearizing the change in throttle position with respect to absolute throttle position and engine speed if the engine is in a throttle deceleration condition; calculating a throttle deceleration fuel lean-out multiplier value based on the linearized change in throttle position; and applying the calculated throttle deceleration fuel lean-out multiplier value to a fuel pulsewidth value of fuel injectors for the engine and reducing the amount of fuel injected into the engine by the fuel injectors.
Claim 2
Independent Claim
135 words
A method of throttle fuel lean-out for an internal combustion engine, said method comprising the steps of: sensing a throttle position of a throttle for the engine with a throttle position sensor; calculating a delta throttle value based on the sensed throttle position; determining whether the engine is in a throttle deceleration condition based on the calculated delta throttle value; linearizing the change in throttle position with respect to absolute throttle position and engine speed if the engine is in a throttle deceleration condition; calculating a throttle deceleration fuel lean-out multiplier value based on the linearized change in throttle position; and applying the calculated throttle deceleration fuel lean-out multiplier value to a fuel pulsewidth value of fuel injectors for the engine and reducing the amount of fuel injected into the engine by the fuel injectors.
Claim 3
Independent Claim
216 words
A method of throttle fuel lean-out for an internal combustion engine, said method comprising the steps of: sensing a throttle position of a throttle for the engine with a throttle position sensor; calculating a delta throttle value by subtracting an instantaneous sensed throttle position value from a time averaged sensed throttle position value; determining whether the engine is in a throttle deceleration condition based on the calculated delta throttle value; determining a first value from a relative mass airflow surface as a function of a time averaged sensed throttle position and current engine speed, determining a second value from the relative mass airflow surface as a function of current instantaneous sensed throttle position and current engine speed, and subtracting the second value from the first value to obtain a delta relative mass airflow value if the calculated delta throttle value is positive if the engine is in a throttle deceleration condition; calculating a throttle deceleration fuel lean-out multiplier value multiplying the delta relative mass airflow value with a predetermined throttle lean-out multiplier value to obtain the throttle deceleration fuel lean-out value; and applying the calculated throttle deceleration fuel lean-out multiplier value to a fuel pulsewidth value of fuel injectors for the engine and reducing the amount of fuel injected into the engine by the fuel injectors.
Claim 4
Independent Claim
216 words
A method of throttle fuel lean-out for an internal combustion engine, said method comprising the steps of: sensing a throttle position of a throttle for the engine with a throttle position sensor; calculating a delta throttle value by subtracting an instantaneous sensed throttle position value from a time averaged sensed throttle position value; determining whether the engine is in a throttle deceleration condition based on the calculated delta throttle value; determining a first value from a relative mass airflow surface as a function of a time averaged sensed throttle position and current engine speed, determining a second value from the relative mass airflow surface as a function of current instantaneous sensed throttle position and current engine speed, and subtracting the second value from the first value to obtain a delta relative mass airflow value if the calculated delta throttle value is positive if the engine is in a throttle deceleration condition; calculating a throttle deceleration fuel lean-out multiplier value multiplying the delta relative mass airflow value with a predetermined throttle lean-out multiplier value to obtain the throttle deceleration fuel lean-out value; and applying the calculated throttle deceleration fuel lean-out multiplier value to a fuel pulsewidth value of fuel injectors for the engine and reducing the amount of fuel injected into the engine by the fuel injectors.
Claim 5
Independent Claim
145 words
A method of throttle fuel lean-out for an internal combustion engine, said method comprising the steps of: sensing a throttle position of a throttle for the engine with a throttle position sensor; calculating a delta throttle value by subtracting an instantaneous sensed throttle position value from a time averaged sensed throttle position value; determining whether the engine is in a throttle deceleration condition based on the calculated delta throttle value; linearizing the change in throttle position with respect to absolute throttle position and engine speed if the engine is in a throttle deceleration condition; calculating a throttle deceleration fuel lean-out multiplier value based on the linearized change in throttle position; and applying the calculated throttle deceleration fuel lean-out multiplier value to a fuel pulsewidth value of fuel injectors for the engine and reducing the amount of fuel injected into the engine by the fuel injectors.
Claim 6
Independent Claim
145 words
A method of throttle fuel lean-out for an internal combustion engine, said method comprising the steps of: sensing a throttle position of a throttle for the engine with a throttle position sensor; calculating a delta throttle value by subtracting an instantaneous sensed throttle position value from a time averaged sensed throttle position value; determining whether the engine is in a throttle deceleration condition based on the calculated delta throttle value; linearizing the change in throttle position with respect to absolute throttle position and engine speed if the engine is in a throttle deceleration condition; calculating a throttle deceleration fuel lean-out multiplier value based on the linearized change in throttle position; and applying the calculated throttle deceleration fuel lean-out multiplier value to a fuel pulsewidth value of fuel injectors for the engine and reducing the amount of fuel injected into the engine by the fuel injectors.
Claim 7
Dependent Claim
23 words
A method as set forth in claim 3 wherein said step of determining comprises determining whether the calculated delta throttle value is positive.
Claim 8
Dependent Claim
86 words
A method as set forth in claim 3 wherein said step of linearizing comprises determining a first value from a relative mass airflow surface as a function of a time averaged sensed throttle position and current engine speed, determining a second value from the relative mass airflow surface as a function of current instantaneous sensed throttle position and current engine speed, and subtracting the second value from the first value to obtain a delta relative mass airflow value if the calculated delta throttle value is positive.
Claim 9
Dependent Claim
44 words
A method as set forth in claim 5 wherein said step of calculating the throttle deceleration fuel lean-out multiplier value comprises multiplying the delta relative mass airflow value with a predetermined throttle lean-out multiplier value to obtain the throttle deceleration fuel lean-out multiplier value.
Claim 10
Dependent Claim
40 words
A method as set forth in claim 6 including the step of clearing the delta relative mass airflow value to zero and the throttle deceleration fuel lean-out multiplier value to zero if the calculated delta throttle value is not positive.
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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) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |