Control system for internal combustion engine
First Claim
1. A control system for an internal combustion engine that is capable of changing valve-closing timing of an intake valve relative to valve-opening timing of an intake valve as desired by a variable intake valve timing device, the control system comprising:
- start operation-determining means for determining whether or not the engine is in starting operation;
intake valve timing-setting means for setting the valve-closing timing of the intake valve to retarded timing with respect to predetermined timing in which a compression ratio becomes equal to an expansion ratio in a combustion cycle of the engine, when it is determined by said start operation-determining means that the engine is in starting operation; and
intake control means for controlling the variable intake valve timing device, according to the set valve-closing timing of the intake valve.
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Accused Products
Abstract
A control system for an internal combustion engine, which is capable of reducing exhaust emissions during and after the start of the engine. A control system is capable of changing the valve-closing timing of intake valves relative to the valve-opening timing thereof as desired using a variable intake valve actuation assembly. The control system includes an ECU. The ECU sets a target auxiliary intake cam phase to a start value that sets the valve-closing timing of the intake valves to retarded-closing timing, during starting of the engine, and to a catalyst warmup value that sets the same to timing closer to timing in the Otto cycle operation, during catalyst warmup control after the start of the engine.
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Citations
17 Claims
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1. A control system for an internal combustion engine that is capable of changing valve-closing timing of an intake valve relative to valve-opening timing of an intake valve as desired by a variable intake valve timing device,
the control system comprising: -
start operation-determining means for determining whether or not the engine is in starting operation;
intake valve timing-setting means for setting the valve-closing timing of the intake valve to retarded timing with respect to predetermined timing in which a compression ratio becomes equal to an expansion ratio in a combustion cycle of the engine, when it is determined by said start operation-determining means that the engine is in starting operation; and
intake control means for controlling the variable intake valve timing device, according to the set valve-closing timing of the intake valve. - View Dependent Claims (2, 3, 5, 11, 13, 15)
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4. A control system for an internal combustion engine that is capable of changing valve-opening timing of an exhaust valve relative to valve-closing timing of the exhaust valve as desired by a variable exhaust valve timing device,
the control system comprising: -
start operation-determining means for determining whether or not the engine is in starting operation;
exhaust valve timing-setting means for setting the valve-opening timing of the exhaust valve to retarded timing with respect to predetermined timing in which a compression ratio becomes equal to an expansion ratio in a combustion cycle of the engine, when it is determined by said start operation-determining means that the engine is in starting operation; and
exhaust control means for controlling the variable exhaust valve timing device, according to the set valve-opening timing of the exhaust valve. - View Dependent Claims (6, 16)
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7. A control system for an internal combustion engine that has a catalytic converter provided in an exhaust passage, for reducing emissions of exhaust gases, and is capable of changing an amount of intake air as desired by a variable intake air amount device, and capable of changing valve-opening timing of an exhaust valve relative to valve-closing timing of the exhaust valve by a variable exhaust valve timing device,
the control system comprising: -
catalyst warmup-determining means for determining whether or not catalyst warmup control should be carried out after a start of the engine, for activation of the catalytic converter;
intake air amount-setting means for setting the amount of intake air to a larger value than during the starting operation of the engine, wherein it is determined by said catalyst warmup-determining means that the catalyst warmup control should be carried out;
exhaust valve timing-setting means for setting the valve-opening timing of the exhaust valve to advanced timing with respect to predetermined timing in which a compression ratio becomes equal to an expansion ratio in a combustion cycle of the engine, when it is determined that the catalyst warmup control should be carried out;
intake control means for controlling the variable intake air amount device, according to the set amount of intake air; and
exhaust control means for controlling the variable exhaust valve timing device, according to the set valve-opening timing of the exhaust valve. - View Dependent Claims (8, 9, 10, 12, 14, 17)
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Specification