Control system for internal combustion engine
First Claim
1. An engine control system for controlling an internal combustion engine mounted on a vehicle, said engine control system comprising:
- throttle opening detection means for detecting a throttle opening of the engine;
rotational speed detection means for detecting a rotational speed of the engine;
prediction means for predicting an engine load and a change in said engine load with time in a specified period of time from an occurrence of driver'"'"'s operation for causing an increase in throttle opening on the basis of said throttle opening and said rotational speed when said occurrence of driver'"'"'s operation is detected on the basis of a result of detection by said throttle opening detection means;
filter means for extracting a resonant frequency component that is coincide with a resonant frequency of a driveline of the vehicle from of said change in engine load predicted by said prediction means; and
torque control means for performing torque reduction control which reduces engine torque by an amount meeting said resonant frequency component at a torque reduction timing corresponding to an occurrence of said resonant frequency component.
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Accused Products
Abstract
An engine control system for diminishing driveline vibrations extracts resonant frequency component coincident in frequency with a driveline resonant vibration according to a gear ratio of a transmission of the driveline from a change in charging efficiency with time that is detected on the basis of a signal representative of an amount of intake air, converts the resonant frequency component to a demanded amount of engine torque reduction after having adjusted the resonant frequency component in phase, and causes the demanded amount of engine torque reduction by retarding an ignition timing and/or reducing an amount of fuel injection.
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Citations
12 Claims
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1. An engine control system for controlling an internal combustion engine mounted on a vehicle, said engine control system comprising:
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throttle opening detection means for detecting a throttle opening of the engine;
rotational speed detection means for detecting a rotational speed of the engine;
prediction means for predicting an engine load and a change in said engine load with time in a specified period of time from an occurrence of driver'"'"'s operation for causing an increase in throttle opening on the basis of said throttle opening and said rotational speed when said occurrence of driver'"'"'s operation is detected on the basis of a result of detection by said throttle opening detection means;
filter means for extracting a resonant frequency component that is coincide with a resonant frequency of a driveline of the vehicle from of said change in engine load predicted by said prediction means; and
torque control means for performing torque reduction control which reduces engine torque by an amount meeting said resonant frequency component at a torque reduction timing corresponding to an occurrence of said resonant frequency component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An engine control system for controlling an internal combustion engine mounted on a vehicle, said engine control system comprising:
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a throttle opening sensor for detecting a throttle opening of a throttle valve;
a rotational speed sensor for detecting a rotational speed of the engine; and
a control unit operative to control a fuel injector on the basis of said throttle opening and said rotational speed;
wherein said control unit predicts an engine load and a change in (said) engine load with time in a specified period of time from an occurrence of driver'"'"'s operation for causing an increase in throttle opening on the basis of said throttle opening and said rotational speed when said occurrence of driver'"'"'s operation is detected on the basis of a result of detection by said throttle opening sensor;
extracts a resonant frequency component that is coincide with a resonant frequency of a driveline of the vehicle from of said change in engine load predicted, and controlling said fuel injector so as to reduce engine torque by an amount meeting said resonant frequency component at a torque reduction timing corresponding to an occurrence of said resonant frequency component.
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Specification