Apparatus for controlling timings of exhaust valves and method thereof

摘要

The timing for opening the exhaust valve (9) is advanced by an angle that varies depending upon the load exerted on an engine (1) and the rotational speed of the engine (1) at the cold starting of the engine (1) during a predetermined period of time after the complete combustion. The heat of combustion is positively discharged into an exhaust system and hence, an oxygen sensor and a catalytic converter disposed in the exhaust system of the engine (1) are activated more quickly. <IMAGE>