초록 ▼

An engine is provided with a variable valve mechanism capable of changing a degree of an operating angle and a phase of a valve-open period of an intake valve. A controller selectively executes at least one of a plurality of knock controls including a phase adjustment of the valve-open period of the

An engine is provided with a variable valve mechanism capable of changing a degree of an operating angle and a phase of a valve-open period of an intake valve. A controller selectively executes at least one of a plurality of knock controls including a phase adjustment of the valve-open period of the intake valve when a knocking is detected by a knock sensor. When the operating angle of the intake valve is smaller than 180 degrees, a knock control is selected and executed such that a valve-open timing IVO of the intake valve does not exceed a predetermined timing (TDC+α) retarded from a top dead center TDC by a predetermined angle α. Specifically, for example, when the operating angle is smaller than 180 degrees and the valve-open timing IVO of the intake valve is after the top dead center TDC, the valve-open timing IVO is advanced.

대표청구항 ▼

1. A control system for an internal combustion engine, comprising:an intake valve; a variable valve mechanism capable of changing a degree of an operating angle and a phase of a valve-open period of the intake valve; a knock sensor for detecting a knocking in the internal combustion engine, and a co

1. A control system for an internal combustion engine, comprising:an intake valve; a variable valve mechanism capable of changing a degree of an operating angle and a phase of a valve-open period of the intake valve; a knock sensor for detecting a knocking in the internal combustion engine, and a controller that selectively executes at least one of a plurality of knock controls including a phase adjustment of the valve-open period of the intake valve when a knocking is detected by the knock sensor, wherein the controller is adapted to perform a knock control mode in which a knock control is selected and executed such that a valve-open timing of the intake valve does not exceed a predetermined timing that is retarded from a top dead center by a predetermined angle when the operating angle of the intake valve is smaller than 180 degrees. 2. The control system according to claim 1, wherein the controller is adapted to, during the knock control mode, advance the valve-open timing of the intake valve if the valve-open timing of the intake valve is after the top dead center when a knocking occurs.3. The control system according to claim 2, wherein the controller is adapted to advance the valve-open timing of the intake valve by advancing the phase of the valve-open period while maintaining the operating angle of the intake valve.4. The control system according to claim 2, wherein the controller is adapted to advance the valve-open timing of the intake valve by increasing the operating angle of the intake valve.5. The control system according to claim 1, wherein the controller is adapted to, during the knock control mode, select a knock control such that the valve-open timing of the intake valve does not exceed the predetermined timing that is retarded from the top dead center by the predetermined angle, and a valve-close timing of the intake valve does not enter a predetermined range near a bottom dead center.6. The control system according to claim 1, wherein the controller is adapted to correct an ignition timing based on the valve-open timing and the valve-close timing of the intake valve when no knocking occurs.7. The control system according to claim 6, wherein the controller is adapted to retard the ignition timing as the valve-open timing of the intake valve is retarded from the top dead center, and the valve-close timing of the intake valve approaches the bottom dead center.8. A control system for an internal combustion engine, comprising:an intake valve; a variable valve mechanism capable of changing an operating angle of the intake valve and a phase of a valve-open period of the intake valve; a knock sensor for detecting a knocking in the internal combustion engine; and a controller that selectively executes at least one of a plurality of knock controls including a phase adjustment of the valve-open period of the intake valve when a knocking is detected by the knock sensor, wherein the controller is adapted to, when a knocking is detected by the knock sensor, determine the present setting condition of a valve-open timing and valve-close timing of the intake valve among four setting conditions: i) a first setting condition in which the valve-open timing of the intake valve is before a top dead center and the valve-close timing is before a bottom dead center; ii) a second setting condition in which the valve-open timing of the intake valve is after the top dead center and the valve-close timing is before the bottom dead center; iii) a third setting condition in which the valve-open timing of the intake valve is before the top dead center and the valve-close timing is after the bottom dead center; and iv) a fourth setting condition in which the valve-open timing of the intake valve is after the top dead center and the valve-close timing is after the bottom dead center, and execute a knock control that is selected beforehand for each of the four setting conditions. 9. The control system according to claim 8, wherein the controller is adapted to advance the valve-open timing of the intake valve if the intake valve is in the second setting condition when a knocking is detected by the knock sensor.10. A control method for an internal combustion engine with a variable valve mechanism capable of changing an operating angle of an intake valve and a phase of a valve-open period of the intake valve, the control method being characterized by comprising:a detection step of detecting a knocking in the internal combustion engine; and a selection-execution step of selectively executing at least one of a plurality of knock controls including a phase adjustment of the valve-open period of the intake valve when a knocking is detected, wherein in the selection-execution step a knock control is selected and executed such that a valve-open timing of the intake valve does not exceed a predetermined timing that is retarded from a top dead center by a predetermined angle, when the operating angle of the intake valve is smaller than 180 degrees. 11. A control method of controlling an internal combustion engine with a variable valve mechanism capable of changing an operating angle of an intake valve and a phase of a valve-open period of the intake valve, the control method being characterized by comprising:a detection step of detecting a knocking in the internal combustion engine, and a selection-execution step of selectively executing at least one of a plurality of knock controls including a phase adjustment of the valve-open period of the intake valve when a knocking is detected, wherein the selection-execution step includes determining, when a knocking is detected, the present setting condition of the valve-open timing and the valve-close timing of the intake valve among four setting conditions: i) a first setting condition in which a valve-open timing of the intake valve is before a top dead center and a valve-close timing is before a bottom dead center; ii) a second setting condition in which the valve-open timing of the intake valve is after the top dead center and the valve-close timing is before the bottom dead center; iii) a third setting condition in which the valve-open timing of the intake valve is before the top dead center and the valve-close timing is after the bottom dead center; and iv) a fourth setting condition in which the valve-open timing of the intake valve is after the top dead center and the valve-close timing is after the bottom dead center, and the selection-execution step further includes executing a knock control that is selected beforehand for each of the four setting conditions.