Air flow control device of engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShinji Sadakane, Hiroki Ichinose
Life of this patent
Estimating the term…
Abstract
An air flow control device of an engine comprising an air flow control valve arranged in the intake passage and actuated by the vacuum operated diaphragm type drive apparatus. At the cranking of the engine, the air flow control valve is held in the closed state. When the engine speed exceeds a predetermined engine speed, for example, 400 rpm, a valve open signal for the air flow control valve is given to the vacuum operated diaphragm type drive device. After the valve open signal is given, during the valve opening delay period of the air flow control valve, an opening area of the idling speed control valve is increased.
Claims21
An air flow control device of an engine having an intake passage comprising:
- a throttle valve arranged in the intake passage;
- an air flow control valve arranged in the intake passage downstream of said throttle valve;
- drive means for driving said air flow control valve;
- control means for controlling said drive means to retain said air flow control valve in a closed state when the cranking operation of the engine is carried out and to give a valve open signal for said air flow control valve to said drive means when the engine speed exceeds a predetermined speed;
- said drive means opening said air flow control valve when a predetermined time has elapsed after said valve open signal is given to said drive means, due to the delay of action of said drive means;
- and
- flow area increasing means for increasing a flow area of an air flow passage by which air is fed into the intake passage downstream of said throttle valve until said predetermined time has elapsed after said valve open signal is given to said drive means.
Dependencies are inferred from the claim text.