Control system for internal combustion engine
First Claim
1. A control system for an intra-cylinder injection type internal combustion engine, comprising:
- a fuel injection device for supplying a fuel directly into a combustion chamber of the internal combustion engine;
injection mode selecting means for selecting, according to a state of operation of the internal combustion engine, either a suction stroke injection mode in which a fuel injection is performed mainly in a suction stroke or a compression stroke injection mode in which the fuel injection is performed mainly in a compression stroke;
fuel injection control means for controlling said fuel injection device in accordance with the injection mode selected by said injection mode selecting means; and
idling speed setting means for setting a first target idling speed for said compression stroke injection mode and a second target idling speed for the suction stroke injection mode, said idling speed setting means setting said first target idling speed at a lower speed than said second target idling speed.
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Accused Products
Abstract
In an intra-cylinder injection type engine, a first fuel cut-off starting rotational speed, a first return rotational speed and a first target idling speed in a compression stroke injection mode, which is superior in both combustion and responsivity, are set at lower speeds than a second fuel cut-off starting rotational speed, a second return rotational speed, and a second target idling speed in a suction stroke injection mode. During an operation in the compression stroke injection mode, a fuel cut-off mode and an idle running of the engine are practiced at a low engine speed, to improve the fuel economy without causing deterioration of combustion.
14 Citations
16 Claims
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1. A control system for an intra-cylinder injection type internal combustion engine, comprising:
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a fuel injection device for supplying a fuel directly into a combustion chamber of the internal combustion engine; injection mode selecting means for selecting, according to a state of operation of the internal combustion engine, either a suction stroke injection mode in which a fuel injection is performed mainly in a suction stroke or a compression stroke injection mode in which the fuel injection is performed mainly in a compression stroke; fuel injection control means for controlling said fuel injection device in accordance with the injection mode selected by said injection mode selecting means; and idling speed setting means for setting a first target idling speed for said compression stroke injection mode and a second target idling speed for the suction stroke injection mode, said idling speed setting means setting said first target idling speed at a lower speed than said second target idling speed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control system for an intra-cylinder injection type internal combustion engine, comprising:
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a fuel injection device for supplying a fuel directly into a combustion chamber of the internal combustion engine; injection mode selecting means for selecting one of a suction stroke injection mode in which a fuel injection is performed mainly in a suction stroke, a compression stroke injection mode in which the fuel injection is performed mainly in a compression stroke, and a fuel cut-off mode for stopping the injection of fuel, according to a state of an operation of the internal combustion engine; fuel injection control means for controlling said fuel injection device in accordance with said suction stroke injection mode, said compression stroke injection mode, or said fuel cut-off mode, selected by said injection mode selecting means; and return rotational speed setting means for setting a first return rotational speed for restarting the supply of fuel at the time of return from said fuel cut-off mode to said compression stroke injection mode, and a second return rotational speed for restarting the supply of fuel at the time of return from said fuel cut-off mode to said suction stroke injection mode, said return rotational speed setting means setting said first return rotational speed at a lower speed than said second return rotational speed. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A control system for an intra-cylinder injection type internal combustion engine, comprising:
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a fuel injection device for supplying a fuel directly into a combustion chamber of the internal combustion engine; injection mode selecting means for selecting, according to the state of operation of the internal combustion engine, one of a suction stroke injection mode in which a fuel injection is performed mainly in a suction stroke, a compression stroke injection mode in which the fuel injection is performed mainly in a compression stroke, and a fuel cut-off mode for stopping the injection of fuel; fuel injection control means for controlling said fuel injection device in accordance with said suction stroke injection mode, said compression stroke injection mode, or said fuel cut-off mode, selected by said injection mode selecting means; and fuel cut-off lower-limit rotational speed setting means for setting a first fuel cut-off lower-limit rotational speed which, on a low rotational speed side of the internal combustion engine, permits change-over from said compression stroke injection mode to said fuel cut-off mode and also for setting a second fuel cut-off lower-limit rotational speed which, on said low rotational speed side, permits change-over from said suction stroke injection mode to said fuel cut-off mode, said fuel cut-off lower-limit rotational speed setting means setting said first fuel cut-off lower-limit rotational speed at a lower speed than said second fuel cut-off lower-limit rotational speed. - View Dependent Claims (16)
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Specification