Control apparatus and control method for internal combustion engine
First Claim
1. A control apparatus for an internal combustion engine;
- comprising;
an electric variable valve mechanism that is actuated by an electric actuator;
a warm-up determination portion that determines, after the internal combustion engine is started, whether a warm-up needs to be performed;
a first control portion that controls, if it is determined that the warm-up needs to be performed, the electric variable valve mechanism so that a valve overlap duration is increased;
a second control portion that controls the internal combustion engine so that ignition timing is retarded based on an increase in the valve overlap duration,a hydraulic variable valve mechanism that is hydraulically actuated by hydraulic fluid discharged from an oil pump that is driven by the internal combustion engine;
an operation determination portion that determines, based on a pressure of the hydraulic fluid, whether the hydraulic variable valve mechanism is able to operate properly; and
a switching portion that switches, if it is determined that the hydraulic variable valve mechanism is able to operate properly, a mechanism used to increase the valve overlap duration from the electric variable valve mechanism to the hydraulic variable valve mechanism.
1 Assignment
0 Petitions
Accused Products
Abstract
If it is determined that an engine has been started, an engine coolant temperature is detected. If the engine coolant temperature is equal to or lower than a threshold value, the catalyst quick warm-up control is started to retard ignition timing, and a signal indicating a command to increase an operate angle is transmitted to a VVLA controller. When a VVT hydraulic pressure is increased to a predetermined value, a signal indicating a command to decrease the operate angle is transmitted to the VVLA controller, and a signal indicating a command to advance open timing of an intake valve is transmitted to a VVT controller so that the open timing of the intake valve is not changed. If the engine coolant temperature is equal to or higher than a threshold value, the catalyst quick warm-up control ends, and the ignition timing is returned to normal timing.
2 Citations
14 Claims
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1. A control apparatus for an internal combustion engine;
- comprising;
an electric variable valve mechanism that is actuated by an electric actuator; a warm-up determination portion that determines, after the internal combustion engine is started, whether a warm-up needs to be performed; a first control portion that controls, if it is determined that the warm-up needs to be performed, the electric variable valve mechanism so that a valve overlap duration is increased; a second control portion that controls the internal combustion engine so that ignition timing is retarded based on an increase in the valve overlap duration, a hydraulic variable valve mechanism that is hydraulically actuated by hydraulic fluid discharged from an oil pump that is driven by the internal combustion engine; an operation determination portion that determines, based on a pressure of the hydraulic fluid, whether the hydraulic variable valve mechanism is able to operate properly; and a switching portion that switches, if it is determined that the hydraulic variable valve mechanism is able to operate properly, a mechanism used to increase the valve overlap duration from the electric variable valve mechanism to the hydraulic variable valve mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- comprising;
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8. A control method for an internal combustion engine, comprising
determining, after the internal combustion engine is started, whether a warm-up needs to be performed; -
controlling, if it is determined that the warm-up needs to be performed, an electric variable valve mechanism, which is actuated by an electric actuator, so that a valve overlap duration is increased; controlling the internal combustion engine so that ignition timing is retarded based on an increase in the valve overlap duration, determining, based on a pressure of hydraulic fluid discharged from an oil pump that is driven by the internal combustion engine, whether a hydraulic variable valve mechanism, which is hydraulically actuated by the hydraulic fluid, is able to operate properly; and switching, if it is determined that the hydraulic variable valve mechanism is able to operate properly, a mechanism used to increase the valve overlap duration from the electric variable valve mechanism to the hydraulic variable valve mechanism. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification