Patent ID: 6712037
Filing Date: 2004-03-30
Classification: F02B,F02F,F02M,Y02T

Abstract:
A low pressure direct injection engine system for a vehicle comprisingan engine having a plurality of cylinders, each of said cylinders including a piston wherein said cylinders and a top portion of said pistons define a plurality of combustion chambers; a plurality of direct injection fuel injectors, one of said injectors being mounted in fluid communication with each of said combustion chambers and having a nozzle adapted to disperse fuel injected through said nozzle into said combustion chamber at a fuel pressure of roughly 2 MPa; a fuel pump adapted to deliver fuel from a fuel tank within the vehicle, through a fuel rail of the vehicle, to said fuel injectors, said fuel pump comprising a rotary fuel pump mounted within the fuel tank of the vehicle and driven by an electric motor; an igniter mounted within said combustion chamber adapted to ignite fuel within said combustion chamber; and a motor controller adapted to control the speed of said electric motor and a sensor mounted within said fuel rail, said sensor adapted to sense the pressure of the fuel within the fuel rail and to send a signal to said motor controller whereby said motor controller controls the speed of said electric motor such that said fuel pump maintains a roughly constant fuel pressure.