Patent ID: 6431143
Filing Date: 2002-08-13
Classification: F02D,F02M

Abstract:
A controller for adjusting the quantity of fuel delivered by a fuel injection unit pump, said controller comprising:a base defining a control piston bore; a control piston received in said control piston bore for axial reciprocation therein; a rack rod connected to said control piston for axial movement therewith; a source of engine oil pressure, said engine oil pressure increasing from a first low pressure at engine start up to a second higher pressure after engine warm up; a source of engine intake manifold air pressure, said intake manifold air pressure increasing when the engine is under load; first control means for controlling the axial position of said control piston in response to said engine oil pressure; and second control means for controlling the axial position of said control piston in response to said engine intake manifold air pressure, wherein at said first oil pressure the axial position of said control piston is a function of the oil pressure and at oil pressure above a pre-established threshold between said first and second pressures, the axial position of said control piston is a function of the intake manifold air pressure, said control piston moving axially to increase fuel delivery in response to engine oil pressure below said pre-established threshold or increased intake manifold air pressure.