MULTI CARBURETOR SYSTEM OF VARIABLE AREA VENTURI TYPE WITH AUXILIARY FUEL SUPPLY SYSTEM

摘要

An auxiliary fuel supply system for use in a multi carburetor system of the variable area venturi type for an internal combustion engine of a motor vehicle. The auxiliary fuel supply system consists of a body having formed therein a main mixture passage, a slow running mixture circuit and a deceleration circuit. The main mixture passage is connected to intake manifolds of the engine. The slow running mixture circuit has a slow running port communicating with the main mixture passage for supplying the engine with an air-fuel mixture of optimum air-fuel ratio during low speed and light loud operations of the engine. The deceleration mixture circuit has a deceleration port which communicates with the main mixture passage for supplying the engine with an air-fuel mixture of optimum for decelerating condition of the engine. The auxiliary fuel supply system also consists of a control unit having diaphragm means responsive to an intake manifold vacuum of the engine and a valve element attached to the diaphragm means and extending into the deceleration circuit to open and close the deceleration port, the diaphragm means being moved to a position to cause the valve element to open the deceleration port when the intake manifold vacuum reachs a predetermined value.