Variable valve control system and method for internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorShigeki Shindou
Life of this patent
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Abstract
There is provided a variable valve control system for an internal combustion engine, including an intake valve event and lift control mechanism capable of varying an operation angle of an intake valve of the engine; an intake valve timing control mechanism capable of varying a center phase of the operation angle of the intake valve; a detection unit to detect a malfunction in the intake valve timing control mechanism; and a fail-safe unit to control the intake valve event and lift control mechanism upon detection of the malfunction in the intake valve timing control mechanism in such a manner that intake valve opening timing becomes advanced with respect to top dead center.
Claims12
A variable valve control system for an internal combustion engine, comprising:
- an intake valve event and lift control mechanism capable of varying an operation angle of an intake valve of the engine;
- an intake valve timing control mechanism capable of varying a center phase of the operation angle of the intake valve;
- a detection unit to detect a malfunction in the intake valve timing control mechanism;
- and
- a fail-safe unit to control the intake valve event and lift control mechanism so as to advance intake valve opening timing with respect to top dead center in such a manner as to limit the amount of advance of the intake valve opening timing with respect to top dead center to within a predetermined range when the malfunction in the intake valve timing control mechanism is detected.
A variable valve control system for an internal combustion engine, comprising:
- an intake valve event and lift control mechanism capable of varying an operation angle of an intake valve of the engine;
- an intake valve timing control mechanism capable of varying a center phase of the operation angle of the intake valve;
- a detection unit to detect a malfunction in the intake valve timing control mechanism;
- and
- a fail-safe unit to control the intake valve event and lift control mechanism, upon detection of the malfunction in the intake valve timing control mechanism, so as to advance intake valve opening timing with respect to top dead center in such a manner as to limit the amount of advance of the intake valve opening timing with respect to top dead center to within a predetermined range when the engine is in a high-load operating state and to retard the intake valve opening timing with respect to top dead center when the engine is in a low/middle-load operating state.
A variable valve control system for an internal combustion engine, comprising:
- first intake valve control means for varying an intake valve operation angle of the engine;
- second intake valve control means for varying a center phase of the intake valve operation angle;
- malfunction detecting means for detecting a malfunction in said second intake valve control means;
- and
- fail-safe means for controlling said first intake valve control means so as to secure a valve overlap before top dead center and limit the amount of advance of intake valve opening timing with respect to top dead center to within a predetermined range upon detection of the malfunction in said second intake valve control means.
A variable valve control method for an internal combustion engine, comprising:
- detecting a malfunction in intake valve timing control of the engine;
- and
- performing a fail-safe control operation to secure a valve overlap before top dead center and limit an amount of advance of the intake valve opening timing with respect to top dead center to within a predetermined range upon detection of the malfunction in intake valve timing control of the engine.
Dependencies are inferred from the claim text.