SUPPLEMENTAL AIR CONTROLLING SYSTEM FOR INTERNAL COMBUSTION ENGINE WITH FUEL INJECTION SYSTEM

摘要

PURPOSE:To improve accuracy of control for increasing suction air at the time of starting engine, by operating a shutter means disposed in a by-pass passage by- passing the throttle valve through thermal deformation of bimetal which is fixed hermetically at one end threof. CONSTITUTION:Shutter means 1 disposed in air passage 2 is designed to be slidable on the surface of shutter sheet 11 around stopper pin 4. Flow rate of supplemental air is controlled depending on the overlapping area of opening 11a and a hole formed in main shutter plate 1a. Connecting rod 7 fixed to subsidiary shutter plate 1b is extended through slot 11b and is arranged to be turned through thermal deformation of bimetal 3. Here, arrangement is such that leakage of air through the slot 11b is prevented since one end of the same is closed hermetically by subsidiary shutter plate 1b under any circumstances and bimetal 3 is not cooled because of provision of heat-insulating material 9, so that accuracy for the temperature control of bimetal 3 can be improved.