Internal combustion engine controller and control method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKeiichi Sato
Life of this patent
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Abstract
A controller is used in an internal combustion engine provided with an EGR device recirculating some of exhaust gas flowing in an exhaust passage to an intake passage as EGR gas. The EGR device includes an EGR passage and an EGR valve. The controller includes a CPU that controls opening and closing of the EGR valve. The CPU executes determining process of determining whether the temperature of the internal combustion engine is about the same as the outside air temperature, and an axis displacement eliminating process of opening and closing the EGR valve when it is determined that the temperature of the internal combustion engine is about the same as the outside air temperature in the determining process during the operation stop of the internal combustion engine.
Claims19
An internal combustion engine controller for an internal combustion engine, wherein the internal combustion engine includes:
- an intake passage;
- an exhaust passage;
- and
- an EGR device that recirculates some of exhaust gas flowing through the exhaust passage to the intake passage as EGR gas,
- the EGR device includes:
- an EGR passage including
- a first end connected to the exhaust passage, and
- a second end connected to the intake passage;
- and
- an EGR valve provided in the EGR passage,
- the EGR valve includes:
- a metal valve housing in which the EGR passage is formed;
- a valve seat provided in the metal valve housing;
- a valve member supported by the metal valve housing so as to be movable in a separating direction away from the valve seat and an approaching direction opposite to the separating direction and approaching the valve seat;
- and
- an actuator that operates to move the valve member in the separating direction and the approaching direction,
- the EGR valve is configured to
- restrict a flow of the EGR gas in the EGR passage by pressing the valve member against the valve seat when the EGR valve is closed, and
- allow the flow of the EGR gas in the EGR passage by separating the valve member from the valve seat when the EGR valve is opened,
- the internal combustion engine controller includes processing circuitry configured to control the EGR valve by operating the actuator, and
- the processing circuitry is configured to execute:
- a determining process of determining whether a temperature of the internal combustion engine is substantially equal to an outside air temperature;
- and
- in response to determining, in the determining process, that the temperature of the internal combustion engine is substantially equal to the outside air temperature during a stopped state of the internal combustion engine, an axis displacement eliminating process of causing the EGR valve to perform an opening/closing operation to eliminate a displacement between a central axis of the valve seat and a central axis of the valve member.
A method of controlling an internal combustion engine, wherein
- the internal combustion engine includes:
- an intake passage;
- an exhaust passage;
- and
- an EGR device that recirculates some of exhaust gas flowing through the exhaust passage to the intake passage as EGR gas,
- the EGR device includes:
- an EGR passage including
- a first end connected to the exhaust passage, and
- a second end connected to the intake passage;
- and
- an EGR valve provided in the EGR passage,
- the EGR valve includes:
- a metal valve housing in which the EGR passage is formed;
- a valve seat provided in the metal valve housing;
- a valve member supported by the metal valve housing so as to be movable in a separating direction away from the valve seat and an approaching direction opposite to the separating direction and approaching the valve seat;
- and
- an actuator that operates to move the valve member in the separating direction and the approaching direction,
- the EGR valve is configured to
- restrict a flow of the EGR gas in the EGR passage by pressing the valve member against the valve seat when the EGR valve is closed, and
- allow the flow of the EGR gas in the EGR passage by separating the valve member from the valve seat when the EGR valve is opened,
- the method comprising:
- determining whether a temperature of the internal combustion engine is substantially equal to an outside air temperature;
- and
- in response to determining that the temperature of the internal combustion engine is substantially equal to the outside air temperature during a stopped state of the internal combustion engine, causing the EGR valve to perform an opening/closing operation to eliminate a displacement between a central axis of the valve seat and a central axis of the valve member.
Dependencies are inferred from the claim text.