Apparatus and method for controlling internal combustion engine
First Claim
1. An apparatus for controlling an internal combustion engine including a rotating sensor which outputs a rotation signal having a waveform that is different depending on whether an output shaft of the engine is rotated forward or in reverse, and a fuel injection valve for injecting fuel to the internal combustion engine, comprising:
- a control unit comprising a processor and a memory having programmed instructions stored thereon, which when executed by the processor, cause the control unit toreceive the rotation signal and output an operation signal to the fuel injection valve;
measure a waveform of the rotation signal;
calculate a difference between a rotational signal value which is currently measured and a rotational signal value which is previously measureddetect a changeover from forward rotation to reverse rotation when a difference calculated by the control unit exceeds a first threshold value for detection of the changeover from forward rotation to reverse rotation;
detect a changeover from reverse rotation to forward rotation when a difference calculated by the control unit exceeds a second threshold value for detection of the changeover from reverse rotation to forward rotation;
detect an angular position of the output shaft during stop of the internal combustion engine, based on a detection result of rotation by the control unit; and
control fuel injection timing by the fuel injection valve when the internal combustion engine is restarted, based on the angular position of the output shaft.
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Accused Products
Abstract
An apparatus and a method for controlling an internal combustion engine, detects a rotating direction of an output shaft of the internal combustion engine. The internal combustion engine includes a crank angle sensor for outputting a pulse signal in accordance with rotation of a crankshaft. The crank angle sensor outputs at the time of reverse rotation of the crankshaft a pulse signal POS having a wider pulse width than that at the time of forward rotation. A control unit receiving pulse signal POS calculates a difference between a present value and a previous value of a pulse width of pulse signal POS and detects switching of a rotating direction of the crankshaft based on a magnitude of this difference. Thus, it is possible to suppress lowering of detection accuracy of a rotating direction of the crankshaft under the influence of variation of measurement values of the pulse width.
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Citations
20 Claims
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1. An apparatus for controlling an internal combustion engine including a rotating sensor which outputs a rotation signal having a waveform that is different depending on whether an output shaft of the engine is rotated forward or in reverse, and a fuel injection valve for injecting fuel to the internal combustion engine, comprising:
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a control unit comprising a processor and a memory having programmed instructions stored thereon, which when executed by the processor, cause the control unit to receive the rotation signal and output an operation signal to the fuel injection valve; measure a waveform of the rotation signal; calculate a difference between a rotational signal value which is currently measured and a rotational signal value which is previously measured detect a changeover from forward rotation to reverse rotation when a difference calculated by the control unit exceeds a first threshold value for detection of the changeover from forward rotation to reverse rotation; detect a changeover from reverse rotation to forward rotation when a difference calculated by the control unit exceeds a second threshold value for detection of the changeover from reverse rotation to forward rotation; detect an angular position of the output shaft during stop of the internal combustion engine, based on a detection result of rotation by the control unit; and control fuel injection timing by the fuel injection valve when the internal combustion engine is restarted, based on the angular position of the output shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for controlling an internal combustion engine including a rotating sensor outputting a rotation signal having a waveform that is different depending on whether an output shaft of the engine is rotated forward or in reverse, and a fuel injection valve for injecting fuel to the internal combustion engine, comprising:
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a control means for receiving the rotation signal and outputting an operation signal to the fuel injection valve, the control means including a measuring means for measuring a waveform of the rotation signal; an operation means for calculating a difference between a rotational signal value currently measured by the measuring means and a rotational signal value previously measured by the measuring means; a first detecting means for detecting a changeover from forward rotation to reverse rotation when the difference calculated by the operation means exceeds a first threshold value for detection of the changeover from forward rotation to reverse rotation; a second detecting means for detecting a changeover from reverse rotation to forward rotation when the difference calculated by the operation means exceeds a second threshold value for detection of the changeover from reverse rotation to forward rotation; a third detecting means for detecting an angular position of the output shaft during stop of the internal combustion engine, based on a detection result of rotation by the first detecting means and the second detecting means; and an injection control means for controlling fuel injection timing by the fuel injection valve when the internal combustion engine is restarted, based on the angular position of the output shaft detected by the third detecting means.
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16. A method for controlling an internal combustion engine including a rotating sensor outputting a rotation signal having a waveform that is different depending on whether an output shaft of the engine is rotated forward or in reverse, and a fuel injection valve for injecting fuel to the internal combustion engine, comprising:
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receiving, by a control unit, the rotation signal and outputting, by the control unit, an operation signal to the fuel injection valve, the control unit performing; measuring a waveform of the rotation signal; calculating a difference between a rotational signal value currently measured by the control unit and a rotational signal value previously measured by the control unit; detecting a changeover from forward rotation to reverse rotation when the difference calculated by the control unit exceeds a first threshold value for detection of the changeover from forward rotation to reverse rotation; detecting a changeover from reverse rotation to forward rotation when the difference calculated by the control unit exceeds a second threshold value for detection of the changeover from reverse rotation to forward rotation; detecting an angular position of the output shaft during stop of the internal combustion engine, based on a detection result of rotation by the control unit; and controlling fuel injection timing by the fuel injection valve when the internal combustion engine is restarted, based on the angular position of the output shaft detected by the control unit. - View Dependent Claims (17, 18, 19, 20)
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Specification