Control device for internal combustion engine
AssigneeDenso Corporation
InventorsShinichi HIRAOKA, Yukitoshi SHIDA
Life of this patent
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Abstract
When an engine is started, an ECU determines whether an inside of a cylinder is in a wet concerned state in which there is a concern about fuel wet, or the inside of the cylinder is in a liquid particle float state in which a large volume of floating liquid particle of fuel arise. On determination that it is in the wet concerned state, the ECU performs a first control for reducing an intake air amount as a control of an opening timing and a closing timing by using the variable valve device. On determination that it is in the floating liquid particle state, the ECU performs a second control for increasing an in-cylinder temperature as a control of the opening timing and the closing timing by using the variable valve device.
Claims6
A control device for an internal combustion engine, the internal combustion engine including a fuel injection valve configured to inject fuel into a cylinder and a variable valve device configured to change an opening timing and a closing timing of at least an intake valve among the intake valve and an exhaust valve, the control device for the internal combustion engine configured to control a fuel injection amount based on an intake air amount of the internal combustion engine and control the opening timing and the closing timing of the intake valve with the variable valve device based on an operating state of the internal combustion engine, the control device for the internal combustion engine comprising:
- a computation unit configured to compute an amount of unvaporized fuel generated in the cylinder based on at least one of a temperature of the internal combustion engine, a fuel injection amount of the fuel injection valve, or a fuel pressure of fuel supplied to the fuel injection valve;
- a determination unit configured to determine whether an inside of a cylinder is in a wet concerned state in which fuel wet is concerned or the inside of the cylinder is in a liquid particle float state in which a large volume of floating liquid particle of fuel arise based on the amount of unvaporized fuel generated in the cylinder and computed by the computation unit, when the internal combustion engine is started;
- a first control unit configured to perform, as a control of the opening timing and the closing timing with the variable valve device, a first control to reduce the intake air amount when the determination unit determines that the inside of the cylinder is in the wet concerned state;
- and
- a second control unit configured to perform, as the control of the opening timing and the closing timing with the variable valve device, a second control to raise an in-cylinder temperature when the determination unit determines that the inside of the cylinder is in the liquid particle float state.
A control device for an internal combustion engine, the internal combustion engine including a fuel injection valve configured to inject fuel into a cylinder and a variable valve device configured to change an opening timing and a closing timing of at least an intake valve among the intake valve and an exhaust valve, the control device for the internal combustion engine configured to control a fuel injection amount based on an intake air amount of the internal combustion engine and control the opening timing and the closing timing of the intake valve with the variable valve device based on an operating state of the internal combustion engine, the control device for the internal combustion engine comprising:
- a determination unit configured to determine whether an inside of a cylinder is in a wet concerned state in which fuel wet is concerned or the inside of the cylinder is in a liquid particle float state in which a large volume of floating liquid particle of fuel arise, when the internal combustion engine is started;
- a first control unit configured to perform, as a control of the opening timing and the closing timing with the variable valve device, a first control to reduce the intake air amount when the determination unit determines that the inside of the cylinder is in the wet concerned state;
- and
- a second control unit configured to perform, as the control of the opening timing and the closing timing with the variable valve device, a second control to raise an in-cylinder temperature when the determination unit determines that the inside of the cylinder is in the liquid particle float state, wherein a first period is a period of one combustion cycle from first explosion of the internal combustion engine after the internal combustion engine is initially rotated with a starting device to rotate an output shaft of the internal combustion engine,
- a second period follows the period of the one combustion cycle after the first explosion, and
- the determination unit is configured to
- determine that the inside of the cylinder is in the wet concerned state in the first period and
- determine that the inside of the cylinder is in the liquid particle float state in the second period.
A control device for an internal combustion engine, the internal combustion engine including a fuel injection valve configured to inject fuel into a cylinder and a variable valve device configured to change an opening timing and a closing timing of at least an intake valve among the intake valve and an exhaust valve, the control device for the internal combustion engine configured to control a fuel injection amount based on an intake air amount of the internal combustion engine and control the opening timing and the closing timing of the intake valve with the variable valve device based on an operating state of the internal combustion engine, the control device for the internal combustion engine comprising:
- a determination unit configured to determine whether an inside of a cylinder is in a wet concerned state in which fuel wet is concerned or the inside of the cylinder is in a liquid particle float state in which a large volume of floating liquid particle of fuel arise, when the internal combustion engine is started;
- a first control unit configured to perform, as a control of the opening timing and the closing timing with the variable valve device, a first control to reduce the intake air amount when the determination unit determines that the inside of the cylinder is in the wet concerned state;
- and
- a second control unit configured to perform, as the control of the opening timing and the closing timing with the variable valve device, a second control to raise an in-cylinder temperature when the determination unit determines that the inside of the cylinder is in the liquid particle float state;
- a restart control unit configured to automatically stop the internal combustion engine when a predetermined automatic stop condition is satisfied and subsequently to automatically start the internal combustion engine when a predetermined restart condition is satisfied, wherein
- on condition that the internal combustion engine is started by the restart control unit, a first period is after the internal combustion engine is initially rotated with the starting device to rotate the output shaft of the internal combustion engine until a rotation speed of the internal combustion engine becomes stable, and a second period is after the rotation speed of the internal combustion engine becomes stable,
- on condition that the internal combustion engine is not started by the restart control unit, the first period is a period of one combustion cycle after first explosion of the internal combustion engine, and the second period follows the period of the one combustion cycle after the first explosion, and
- the determination unit is configured to
- determine that the inside of the cylinder is in the wet concerned state in the first period and
- determine that the inside of the cylinder is in the liquid particle float state in the second period.
Dependencies are inferred from the claim text.