US4471741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized throttle control system
Assignee: Ford Motor Co
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Filing: 1982-12-20
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Granted: 1984-09-18
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Expires: 2002-12-20
Abstract
Abstract The rate of change of throttle position in an internal combustion engine is used to stabilize throttle response when controlling the throttle to a desired position in response to a fuel demand. A constant voltage is generated which controls the throttle position to achieve a direct level of manifold absolute pressure. The constant voltage is equal to the difference between a command voltage representing a desired manifold absolute pressure and a feedback voltage which is the sum of a first product of a first constant and a voltage representing actual manifold absolute pressure and of a second product of a second constant and a voltage representing throttle velocity.
Inventors
- 👤 Joseph R. Asik
- 👤 Jody M. Kirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:42
CPC Classifications
F; F02; F02D; F02D43/00; F02D41/00; F02D41/02; F02D41/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
A closed loop method of controlling a throttle in an internal combustion engine having an intake manifold and controlling air entering the engine as a function of engine operator controlled fuel demand, said method including controlling the throttle as a function of the rate of change of throttle position with respect to time, thereby stabilizing throttle response, and generating a control voltage for controlling throttle position to achieve a desired level of manifold absolute pressure, said control voltage being equal to the difference between a command voltage representing a desired manifold absolute pressure and a feedback voltage which is the sum of a first product of a first constant and a voltage representing actual manifold absolute pressure and of a second product of a second constant and a voltage representing throttle velocity.
Claim 2
Dependent Claim
132 words
A closed loop method of controlling a throttle in an internal combustion engine having an intake manifold and controlling air entering the engine as a function of engine operator controlled fuel demand, said method including controlling the throttle as a function of the rate of change of throttle position with respect to time, thereby stabilizing throttle response, and generating a control voltage for controlling throttle position to achieve a desired level of manifold absolute pressure, said control voltage being equal to the difference between a command voltage representing a desired manifold absolute pressure and a feedback voltage which is the sum of a first product of a first constant and a voltage representing actual manifold absolute pressure and of a second product of a second constant and a voltage representing throttle velocity.
Claim 3
Dependent Claim
34 words
A method of controlling a throttle as recited in claim 1 wherein said command voltage representing a desired manifold absolute pressure is determined as a function of demanded fuel quantity and engine coolant temperature.
Claim 4
Dependent Claim
24 words
A method of controlling a throttle as recited in claim 2 wherein throttle velocity is determined as a function of sensed throttle valve position.
Claim 5
Dependent Claim
130 words
A method as recited in claim 3 further comprising the steps of: directly establishing the quantity of fuel desired; establishing the desired amount of exhaust gas recirculation (EGR); generating a voltage, V MAP ACTUAL, indicative of actual intake manifold absolute pressure; generating a voltage, V TH POS, indicative of throttle position; generating a voltage representative of a desired manifold absolute pressure, V MAP DESIRED ; determining the engine speed (rpm); applying inputs indicative of engine rpm, actual manifold absolute pressure and EGR valve position to an engine electronic control unit means for processing information; generating in the electronic engine control unit means an EGR valve control command, a spark timing control signal, and a throttle position command signal; and adjusting the throttle in accordance with the throttle position command signal.
Claim 6
Independent Claim
133 words
A method of controlling a throttle in an internal combustion engine having an intake manifold including the steps of: generating a voltage, V MAP ACTUAL, representative of actual manifold absolute pressure; generating a voltage, V TH POS, representative of throttle valve position; generating a MAP command voltage representative of a desired manifold absolute pressure; generating a feedback voltage representative of the sum of a first product of a first constant and V MAP ACTUAL, and of a second product of a second constant and a voltage representative of the derivative, with respect to time, of V TH POS ; generating a throttle position command voltage as a function of the difference between the MAP command voltage and the feedback voltage; and adjusting the throttle as a function of the throttle position command voltage.
Claim 7
Independent Claim
133 words
A method of controlling a throttle in an internal combustion engine having an intake manifold including the steps of: generating a voltage, V MAP ACTUAL, representative of actual manifold absolute pressure; generating a voltage, V TH POS, representative of throttle valve position; generating a MAP command voltage representative of a desired manifold absolute pressure; generating a feedback voltage representative of the sum of a first product of a first constant and V MAP ACTUAL, and of a second product of a second constant and a voltage representative of the derivative, with respect to time, of V TH POS ; generating a throttle position command voltage as a function of the difference between the MAP command voltage and the feedback voltage; and adjusting the throttle as a function of the throttle position command voltage.
Claim 8
Independent Claim
191 words
An apparatus for controlling a throttle in an internal combustion engine having an intake manifold, said apparatus including: a manifold absolute pressure sensor means for generating a voltage representative of actual manifold absolute pressure; a throttle valve position sensor means for generating a voltage representative of throttle valve position; an engine electronic control unit means coupled to said pressure sensor means and said position sensor means for generating a MAP command voltage representative of desired manifold absolute pressure and a feedback voltage representative of the sum of a first product of a first constant and the voltage representing actual manifold absolute pressure and of a second product of a second constant and a voltage representative of the derivative, with respect to time, of the voltage representative of throttle valve position; a servo control unit means coupled to said engine electronic control unit means for generating a throttle position command voltage as a function of the difference between the MAP command voltage and the feedback voltage; and a throttle valve actuator means coupled to said servo control unit means for positioning the throttle as a function of the throttle position command voltage.
Claim 9
Independent Claim
191 words
An apparatus for controlling a throttle in an internal combustion engine having an intake manifold, said apparatus including: a manifold absolute pressure sensor means for generating a voltage representative of actual manifold absolute pressure; a throttle valve position sensor means for generating a voltage representative of throttle valve position; an engine electronic control unit means coupled to said pressure sensor means and said position sensor means for generating a MAP command voltage representative of desired manifold absolute pressure and a feedback voltage representative of the sum of a first product of a first constant and the voltage representing actual manifold absolute pressure and of a second product of a second constant and a voltage representative of the derivative, with respect to time, of the voltage representative of throttle valve position; a servo control unit means coupled to said engine electronic control unit means for generating a throttle position command voltage as a function of the difference between the MAP command voltage and the feedback voltage; and a throttle valve actuator means coupled to said servo control unit means for positioning the throttle as a function of the throttle position command voltage.
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) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |