Patent ID: 6901919
Filing Date: 2005-06-07
Classification: F02D,F02M,Y02T

Abstract:
1. A system for controlling a flow of intake air in a secondary intake air passage during a start-up period of an internal combustion engine, a main intake air passage extending to an intake port of the internal combustion engine, a throttle valve located in the main intake air passage, and the secondary intake air passage connecting to the main intake air passage at a position downstream of the throttle valve, the system comprising: a heat radiating element for radiating heat in response to a drive current supplied to the heat radiating element; a thermo-sensitive valve provided in the secondary intake air passage, an opening degree of the thermo-sensitive valve being changed as the thermo-sensitive valve is heated by the heat radiating element; parameter detection means for detecting a plurality of engine operation parameters of the internal combustion engine; determination means for determining a duty ratio that controls the drive current in accordance with the plurality of engine operation parameters detected by the parameter detection means; and drive means for supplying the drive current to the heat radiating element by applying a voltage pulse having a pulse width determined by the duty ratio at a predetermined period.