Engine fuel injection system

A fuel injection system for an internal combustion engine including a fuel pump for periodically transmitting pressurized pulses of fuel through a conduit, said system comprising:

• a. electronic circuit means coupled to the engine for measuring engine performance and for generating an electrical output signal to control engine performance;
• b. valve actuator means coupled to said electronic circuit means for converting the electrical output signal into mechanical displacements between a first and second position;
• c. a servo valve coupled through the conduit to said fuel pump and displaceable by said valve actuator means between a first and a second position for transmitting pressurized fuel through an exit passageway when in the first position and for receiving pressurized fuel through the exit passageway when in the second position;
• and
• d. valve means having a first valve face coupled to the exit passageway of said servo valve and a second valve face coupled through the conduit to said fuel pump for opening said valve means to inject pressurized fuel into a cylinder of said engine when pressurized fuel is both applied to the second face of said valve means by said fuel pump and discharged from the first face of said valve means by the exit passageway of said servo valve.

A fuel injection system for an internal combustion engine including a fuel pump for periodically transmitting pressurized pulses of fuel through a conduit, said system comprising:

• a. engine performance sensor means coupled to said engine for sensing various performance parameters of said engine and generating an engine performance signal;
• b. electronic control means coupled to said engine performance sensor means for receiving the engine performance signal and a control signal and for generating an electrical output signal;
• c. valve actuator means coupled to said electronic control means for converting the electrical output signal into mechanical displacements between a first and a second position;
• d. a servo valve coupled through the conduit to said fuel pump and displacement by said valve actuator means between a first and a second position for transmitting pressurized fuel through an exit passageway when in the first position and for receiving pressurized fuel through the exit passageway when in the second position;
• and
• e. valve means having a first valve face coupled to the exit passageway of said servo valve and a second valve face coupled through the conduit to said fuel pump for injecting measured amounts of pressurized fuel into a cylinder of said engine when pressurized fuel is both applied to the second face of said valve means by said fuel pump and discharged from the first face of said valve means by the exit passageway of said servo valve and for terminating the injection of pressurized fuel into the cylinder when the servo valve is displaced into the second position;
• whereby a measured amount of pressurized fuel is injected into the cylinder of said engine at predetermined variable time intervals independent of the arrival or termination of the pressurized pulse of fuel at said valve means.

A method of injecting a measured quantity of fuel into a cylinder of an internal combustion engine at predetermined variable time intervals comprising the steps of:

• a. generating pressurized pulses of fuel at time intervals having fixed relationship to the position of the engine crank shaft;
• b. transmitting the pressurized pulses of fuel through a conduit to a fuel injector valve;
• c. comparing actual engine operating parameters with desired engine operating parameters to generate an injector control signal;
• and
• d. opening the fuel injector valve a predetermined controllable time after the fuel pressure pulse has arrived at the fuel injector valve in response to the injection control signal and closing the fuel injector valve after a predetermined desired injection time in response to the injection control signal independent of the arrival or termination time of the fuel pressure pulse at the fuel injector valve.