Control apparatus and control method for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNao Murase, Hiroki Ichinose, Yuuichi Katou
Life of this patent
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Abstract
In at least a first cycle at startup, an opening timing of an exhaust valve is controlled to 45 degrees before-bottom-dead-center of an exhaust stroke, or to a retard side of the normal closing timing that is set after warm-up is complete. Also, the closing timing of the exhaust valve is preferably controlled to an advance side of top-dead-center in a second cycle at startup and thereafter at the latest. Accordingly, the amount of unburned HC discharged during a cold start of an internal combustion engine is reduced.
Claims14
A control apparatus for an internal combustion engine, comprising:
- a controller that changes an opening timing and a closing timing of an exhaust valve with an operation angle of the exhaust valve being fixed and remaining constant;
- controls the opening timing of the exhaust valve to a retard side of the opening timing set in a second cycle and thereafter until a first cycle at startup ends;
- controls an injection timing of fuel into an intake port from a fuel injection valve;
- and
- sets the fuel injection timing in the first cycle at startup to within a period during which an intake valve is closed, and sets the fuel injection timing in the second cycle at startup and thereafter to match the opening timing of the intake valve.
A control apparatus for an internal combustion engine, comprising:
- a controller that changes an opening timing and a closing timing of an exhaust valve either independently or in association with an operation angle of the exhaust valve and with operation angle being variable;
- controls the opening timing of the exhaust valve to a retard side of the opening timing set in a cycle that is next after a predetermined cycle and thereafter from startup until the predetermined cycle ends;
- controls an injection timing of fuel into an intake port from a fuel injection valve;
- and
- sets the fuel injection timing in the first cycle at startup to within a period during which an intake valve is closed, and sets the fuel injection timing in the second cycle at startup and thereafter to match the opening timing of the intake valve.
A control method for an internal combustion engine in which an operation angle is fixed, comprising:
- changing an opening timing and a closing timing of an exhaust valve with the operation angle remaining constant;
- controlling the opening timing of the exhaust valve to a retard side of the opening timing set in a second cycle and thereafter until a first cycle at startup ends;
- and
- when the internal combustion engine controls an injection timing of fuel into an intake port from a fuel injection valve, setting the fuel injection timing in the first cycle at startup to within a period during which the intake valve is closed, and setting the fuel injection timing in the second cycle at startup and thereafter to match the opening timing of the intake valve.
A control method for an internal combustion engine in which an operation angle is variable, comprising:
- changing an opening timing and a closing timing of an exhaust valve either independently or in association with the operation angle;
- controlling the opening timing of the exhaust valve to a retard side of the opening timing set in a cycle that is next after a predetermined cycle and thereafter from startup until the predetermined cycle ends;
- and
- when the internal combustion engine controls an injection timing of fuel into an intake port from a fuel injection valve, setting the fuel injection timing in a first cycle at startup to within a period during which an intake valve is closed, and setting the fuel injection timing in a second cycle at startup and thereafter to match the opening timing of the intake valve.
Dependencies are inferred from the claim text.