RPM Governor of a fuel injection pump

Claim 1

In an rpm governor of a fuel injection pump for internal combustion engines, including a housing, an adjustable stop for limiting the maximum injection quantity (full load), a piston in said housing which is hydraulically displaceable counter to a restoring force for varying the position of the stop, said piston having only one end thereof which is exposed to fluid within a work chamber, an inflow conduit in said housing through which fluid from a fluid source flows into said work chamber and pressure control means for controlling the pressure of the fluid within the work chamber, the improvement including: a throttle disposed in the inflow conduit for restricting fluid flow into said work chamber from said fluid source; a fluid outflow conduit in said housing extending from said work chamber to a fluid return line for permitting fluid flow from said work chamber, said pressure control means for controlling the pressure in the work chamber is a magnetic valve which is disposed relative to said outflow conduit extending from said work chamber for controlling fluid flow from said work chamber in accordance with load and rpm of an engine to determine a full load injection quantity, and an electric travel path transducer which is connected with an electronic control unit for measuring the stroke of the piston.