초록 ▼

A control method adjusts fuel injection into an engine having a variable compression ratio. The method determines the cylinder air amount based on various sensors and the current compression ratio. The disclosed fuel injection method can perform both open loop and closed loop control. A method is al

A control method adjusts fuel injection into an engine having a variable compression ratio. The method determines the cylinder air amount based on various sensors and the current compression ratio. The disclosed fuel injection method can perform both open loop and closed loop control. A method is also disclosed for putting the compression ratio to a base value during engine shutdown so that subsequent engine starts occur with a consistent compression ratio.

대표청구항 ▼

1. A method for controlling an internal combustion engine having a variable compression ratio mechanism for varying compression ratio of the engine cylinders, the method comprising:indicating degradation of the variable compression ratio mechanism based on an operating condition; andin response to s

1. A method for controlling an internal combustion engine having a variable compression ratio mechanism for varying compression ratio of the engine cylinders, the method comprising:indicating degradation of the variable compression ratio mechanism based on an operating condition; andin response to said indication, adjusting a fuel injection amount based on said indication. 2. The method recited in claim 1, wherein said operating condition is a position of the variable compression ratio mechanism. 3. The method recited in claim 1, wherein said indicating degradation further comprises indicating when the variable compression ratio mechanism is not following a request signal. 4. The method recited in claim 1 in response to said indication, an ignition timing is further adjusted in response to said indication. 5. The method recited in claim 4 wherein said variable compression ratio mechanism varies compression ratio of the engine cylinders by changing the effective length of a connecting rod of the cylinder, said variable compression ratio mechanism coupled to a crank-shaft end of said connecting rod. 6. A system for controlling an internal combustion engine, the engine having a crankshaft coupled to connecting rods of cylinders in the engine, the system comprising:a variable compression ratio means for varying compression ratio of at least an engine cylinder, said compression ratio means coupled to a crank-shaft end of a connecting rod for said engine cylinder; anda controller for detecting degradation of the variable compression ratio mechanism based on an operating condition, and in response to said detected degradation, adjusting at least one of a fuel injection amount and an ignition timing based on said indication. 7. The system of claim 6 wherein said controller detects degradation of the variable compression ratio mechanism by determining whether said variable compression ratio means remains in a single position even though its desired position changes. 8. A system for controlling an internal combustion engine, the engine having a crankshaft coupled to connecting rods of cylinders in the engine, the system comprising:a variable compression ratio means for varying compression ratio of at least an engine cylinder, said compression ratio means coupled to a crank-shaft end of a connecting rod for said engine cylinder; anda controller for detecting degradation of the variable compression ratio mechanism based on an operating condition, and in response to said detected degradation, adjusting a fuel injection amount and an ignition timing based on said indication. 9. The system of claim 8 wherein said controller detects degradation of the variable compression ratio mechanism by determining whether said variable compression ratio means remains in a single position even though its desired position changes.