Throttle control apparatus
First Claim
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1. A throttle control apparatus comprising:
- an engine which executes a fuel cut at a first predetermined engine rotational number to prevent overrevolution in a high rotational number region;
a throttle system including a throttle valve which is electrically operated to control an operating state of the engine;
a twofold detecting means for detecting failure in the throttle system;
an idle switch for detecting that an accelerator pedal for controlling the engine is in an engine idling operational state; and
control means for executing the fuel cut of the engine to a second engine rotational number lower than the first predetermined engine rotational number when one of the twofold detecting means is determined to be in a failed state, and for executing the fuel cut of the engine to a third engine rotational number lower than the second engine rotational number when one of the twofold detecting means is determined to be in a failed state and the accelerator pedal is in the engine idling operational state.
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Abstract
A throttle control apparatus for an engine is provided with a twofold or redundant detecting unit and when one of the detecting units fails, the maximum opening degree of a throttle valve is decreased, and a control unit controls the engine. The control unit also provides for executing the start of a fuel cut to reduce the maximum engine rotational number to a lower maximum engine rotational number when one detecting unit of the twofold detecting unit fails.
23 Citations
16 Claims
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1. A throttle control apparatus comprising:
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an engine which executes a fuel cut at a first predetermined engine rotational number to prevent overrevolution in a high rotational number region;
a throttle system including a throttle valve which is electrically operated to control an operating state of the engine;
a twofold detecting means for detecting failure in the throttle system;
an idle switch for detecting that an accelerator pedal for controlling the engine is in an engine idling operational state; and
control means for executing the fuel cut of the engine to a second engine rotational number lower than the first predetermined engine rotational number when one of the twofold detecting means is determined to be in a failed state, and for executing the fuel cut of the engine to a third engine rotational number lower than the second engine rotational number when one of the twofold detecting means is determined to be in a failed state and the accelerator pedal is in the engine idling operational state. - View Dependent Claims (2, 3, 4)
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5. A throttle control apparatus for an engine, comprising:
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a throttle system including throttle valve electrically operated to a target throttle opening degree to control an operating state of the engine;
a twofold detecting means for detecting failure in the throttle system;
an idle switch for detecting that an accelerator pedal for controlling the engine is in an engine idling operational state; and
control means for restricting operation of the throttle valve to about one-half of a maximum throttle opening degree when one of the twofold detecting means is in a failed state and for restricting the throttle valve to open less than about one-half of the maximum throttle valve opening degree when the accelerator pedal is in the engine idling operational state and one of the twofold detecting means is in a failed state. - View Dependent Claims (6)
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7. A throttle control apparatus for an engine, comprising:
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accelerator position sensors for detecting a depressed amount of an accelerator pedal which controls the engine, throttle position sensors for detecting a throttle opening degree of a throttle valve, coils of a throttle driving motor for driving a throttle valve, a control device for controlling the throttle opening degree of the throttle valve by communicating with the accelerator position sensors, the throttle position sensors and at least one of the coils, two routes of control circuits each arranged with a respective one of the accelerator position sensors, the throttle position sensors and the coils, and an idle switch coacting with both routes of the control circuits for detecting that the engine is in an engine idling operational state, and the control device controlling an output restriction when one of the control circuits fails and further restricts the output restriction when the idle switch is in an ON state indicating that the accelerator pedal is in the idling operating state. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification