Fuel injection apparatus to compensate for temperature and pressure variations in the ambient atmosphere

Claim 1

In an injection fuel compensation apparatus in a fuel injection type internal combustion engine wherein a suction pipe has an interior behind a throttle valve connected to a negative pressure chamber of a fuel injection apparatus via a pipe, an improvement comprising means providing communication between ambient atmosphere and the negative pressure chamber of the fuel injection apparatus, valve means for controlling flow of air from the ambient atmosphere to said negative pressure chamber, and means acting on said valve means in response to the pressure and temperature of the air flowing to said negative pressure chamber from the ambient atmosphere to regulate the flow of said air, the latter said means comprising a pressure sensitive member and a temperature sensitive member, said valve means comprising a displaceable valve member, and a slidable frame carrying the valve member, means connecting one of the sensitive members to the valve member for displacing the valve member with respect to the frame, means connecting the other sensitive member to the frame for displacing the frame and valve member therewith, a housing containing the valve means and the temperature and pressure sensitive members, said means which provides communication between the ambient atmosphere and the negative pressure comprising an inlet in the housing connected to ambient atmosphere, said valve member being insErted in said inlet to control flow from the ambient atmosphere into said housing, and an outlet conduit leading from the housing to the negative pressure chamber.