Combustion air supply apparatus for an internal combustion engine

Claim 1

An internal combustion engine comprising: an air supply line for supplying combustion air to combustion chamber means of said engine, a load regulating member disposed in said air supply line for controlling the flow of combustion air therethrough, a by-pass line extending in by-passing relationship to said load regulating member from a position upstream of said load regulating member to a position downstream thereof, a supplementary air valve disposed in said by-pass line for controlling the flow of combustion air therethrough, and supplementary air valve control means for controlling said supplementary air valve as a function of the suction pressure in said air supply line of a position downstream of said load regulating member, wherein said supplementary air valve includes: a housing, a valve means for controlling the opening of said by-pass line in dependence on its position, a membrane connected to and moveable with the valve disk, atmosphere opening means in said housing for communicating atmospheric air to one side of said membrane, means for communicating the suction pressure in said air supply line to the other side of said membrane, and spring means engaged between the housing and the valve means, and wherein a separation wall is arranged in the housing between the membrane and the valve means, and wherein a throttle opening is provided in said separation wall.