초록 ▼

A method of controlling a four stroke internal combustion engine having at least one combustion chamber, the or each combustion chamber having at least one exhaust valve, the method including varying the timing of the closure of the or each exhaust valve with respect to the crank angle of the engine

A method of controlling a four stroke internal combustion engine having at least one combustion chamber, the or each combustion chamber having at least one exhaust valve, the method including varying the timing of the closure of the or each exhaust valve with respect to the crank angle of the engine by advancing the exhaust valve closure at least under certain engine conditions in response to an increased engine load, and/or delaying the exhaust valve closure at least under certain conditions in response to a decreased engine load.

대표청구항 ▼

[ What is claimed is:] [1.] A method of controlling a four stroke internal combustion engine having at least one combustion chamber, the at least one combustion chamber having at least one exhaust valve, the method including varying the timing of the closure of the at least one exhaust valve with re

[ What is claimed is:] [1.] A method of controlling a four stroke internal combustion engine having at least one combustion chamber, the at least one combustion chamber having at least one exhaust valve, the method including varying the timing of the closure of the at least one exhaust valve with respect to the crank angle of the engine by advancing the exhaust valve closure at least under certain engine conditions in response to an increased engine load, and/or delaying the exhaust valve closure at least under certain engine conditions in response to a decreased engine load, wherein the timing of the exhaust valve closure varies from about 20.degree. ATDC at a maximum engine load or at wide open throttle of the engine, to up to about 180.degree. ATDC at idle or at low engine loads.