Gm Global Technolgoy Operations, Inc.

Myron U Trenne

Ronald L Colling

Timothy R Schlax

An injector for delivering fuel directly to an engine combustion chamber has a sleeve which responds to the combustion chamber pressure and cooperates with a piston in the injector to pressurize the fuel. A single valve in the injector is controlled both to permit supply of fuel to the injector and to allow injection at the appropriate time and in an appropriate amount.

Fuel injector

A hydraulic valve actuator system for an internal combustion engine in which an engine driven pump means supplies fluid, at high pressure, sequentially to an N number of outlets, each outlet being connected by a check valve and a fluid delivery conduit to an associated actuator means for a poppet valve in a set of N number of poppet valves for the engine, each actuator means including an actuator plunger reciprocably journaled in an actuator cylinder with one end of the actuator plunger positioned for abutment against the stem of an associated poppet valve that is normally held closed by an associated valve return spring. Each fluid delivery conduit is also connected via a drain conduit to a fluid reservoir used to supply fluid at a predetermined supply pressure to the inlet of the pump means, flow from each delivery conduit through its associated drain conduit being controlled by an associated normally open, solenoid valve connectable to an electric control circuit whereby each solenoid valve can be sequentially energized as a function of engine operating perimeters.

Hydraulic valve actuator system

A hydraulic valve actuator and fuel injection system for an internal combustion engine includes an engine driven pump, similar to a diesel fuel metering and distributing pump, which is used to sequentially supply pressurized fuel to each of a plurality of hydraulic actuator plungers positioned to effect opening movement of an associated normally closed inlet valve of the engine, the hydraulic line to each actuator plunger having a solenoid valve associated therewith for controlling flow from the hydraulic line to a relatively low pressure drain conduit whereby to control inlet valve lift duration. Each actuator plunger, during inlet valve opening movement, is used to pressurize liquid fuel for injection into the induction fluid flow to an associated combustion chamber of the engine. In one embodiment, one end of the actuator plunger and one end of its associated actuator cylinder functions as a variable displacement fuel pump supplying fuel to an injection nozzle, and in an alternate embodiment, each actuator plunger is operatively coupled to an associated unit type fuel injector to effect operation thereof.

Hydraulic valve actuator and fuel injection system

The output signal pulses of a constant frequency oscillator are counted between successive timing signals, each of which corresponds to a cylinder of an associated internal combustion engine. The total number of pulses counted during each count period is stored and employed to derive an engine speed advance binary code representation of the number of pulse counts corresponding to the predetermined number of degrees ignition spark engine speed advance for the speed at which the engine is operating. Vacuum advance binary code representation of the number of pulse counts corresponding to the predetermined number of degrees ignition spark vacuum advance is also produced and added to the engine speed advance binary code representation. The difference between the sum of the engine speed and vacuum advance binary code representations and the stored total number of pulses counted during the previous count period and the running total of pulses being counted during the present count period are applied to a comparator circuit which produces an output ignition initiating signal upon the detection of an equality. The oscillator circuit output signal pulses are also counted in another counter circuit between successive ignition initiating signals. The total number of pulses counted between successive ignition initiating signals is employed to derive a dwell initiating signal.

Digital electronic ignition spark timing system

The throttle of a vehicle mounted engine is biased toward its closed position by a return spring, is linked to manual throttle positioning means through a lost motion spring having a greater spring constant than that of the return spring and is provided with a rigid link having a pair of spaced apart stops. The driven member of a clutch extends between the two stops to engage one or the other and override the manual throttle positioning means to position the throttle. Means are provided for generating a signal indicative of clutch driven member position; and an actuator is engaged with the clutch driving member to drive the driven member, when the driving and driven members are engaged, in response to the driven member position signal and an override signal. The vehicle has a brake system, means to generate a signal indicative of brake actuation and means to disengage the clutch driven and driving members upon receipt of the brake actuation signal.

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Rochester, MI, United States of America

Myron U Trenne