초록

A system and method to control engine valve timing to improve the start of an internal combustion engine. Electromechanical valves are controlled in a manner to reduce hydrocarbon emissions during the start of an internal combustion engine.

대표청구항 ▼

The invention claimed is: 1. A method for reducing emissions of an internal combustion engine with electromechanically actuated valves, the method comprising: processing a signal to stop said engine; adjusting a valve opening position of at least a cylinder based on said processed signal; adjusting

The invention claimed is: 1. A method for reducing emissions of an internal combustion engine with electromechanically actuated valves, the method comprising: processing a signal to stop said engine; adjusting a valve opening position of at least a cylinder based on said processed signal; adjusting fuel injected into said cylinder to produce a lean mixture in said cylinder; and operating said cylinder for at least one intake stroke of said cylinder after said valve opening position adjustment and said fuel adjustment. 2. The method of claim 1 wherein said valve is an intake valve. 3. The method of claim 2 wherein said intake valve opening position is between 30 and 180 crank angle degrees after top-dead-center of the intake stroke of said cylinder. 4. The method of claim 1 wherein said valve is an exhaust valve. 5. The method of claim 1 wherein spark timing is adjusted based on said processed signal. 6. A method for reducing emissions of an internal combustion engine with electromechanically actuated valves, the method comprising: processing a signal to stop said engine; adjusting a valve opening position of at least a cylinder based on said processed signal and an estimated fuel puddle mass; and operating said cylinder for at least one intake stroke of said cylinder after said valve opening position adjustment and said fuel adjustment. 7. The method of claim 6 wherein spark timing is adjusted based on said processed signal. 8. The method of claim 6 wherein said valve is an intake valve. 9. A computer readable storage medium having stored data representing instructions executable by a computer to control an internal combustion engine to control electromechanically actuated valves, the storage medium comprising: instructions for processing a signal indicative of a request to stop said engine; instructions for adjusting a valve opening position of at least a cylinder based on said processed signal; and instructions for operating said cylinder for at least one intake stroke of said cylinder after said valve opening position adjustment.