Controllers for a combustion engine able to lower the intake air pressure to a vacuum during an engine cranking operation

摘要

The object of the present invention is to provide a controller, for a combustion engine, having a simple structure and which can reduce the exhaust emissions at the engine start-up time. The controller comprises a means for decreasing the pressure in an intake air passage downstream of a throttle valve during the engine cranking operation. A controller comprises an air pump, a means for communicating an inlet of the air pump either to the atmosphere or to an intake air passage downstream of a throttle valve, and a means for changing the inlet of the air pump from the atmosphere to the intake air passage downstream of the throttle valve and to activate the air pump during the engine cranking operation. Another controller comprises a vacuum tank, for example, a brake-booster instead of the air pump that enables it to more quickly reduce the air pressure in the intake air passage downstream the throttle valve. <IMAGE>