Variable stroke direct injection fuel pump system
AssigneeFca US LLC
InventorGlen R Macfarlane
Life of this patent
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Abstract
A variable stroke direct injection (DI) fuel pump system for an engine includes a DI fuel pump having a stroke member and configured to pump a quantity of fuel based on a stroke of the stroke member. The system includes a variable fuel pump actuator assembly comprising an actuator member configured to actuate the stroke member, a control valve configured to control a flow of hydraulic fluid to the actuator member, and a hydraulic fluid pump configured to pump the hydraulic fluid and be actuated by one or more lobes of a camshaft. The system also includes an engine control unit (ECU) configured to control a variable stroke of the stroke member by controlling the control valve based on one or more operating parameters of the engine.
Claims18
A variable stroke direct injection fuel pump system for an engine, the system comprising:
- a direct injection (DI) fuel pump including a stroke member and configured to pump a quantity of fuel based on a stroke of the stroke member, wherein the stroke member is a plunger;
- a variable fuel pump actuator assembly associated with a cylinder head of the engine and configured to activate the DI fuel pump, the variable fuel pump actuator assembly comprising:
- an actuator member in fluid communication with a control valve and configured to actuate the stroke member in response to a pressure of hydraulic fluid at the actuator member, wherein the actuator member includes a piston,
- the control valve configured to control the fluid pressure at the actuator member by controlling a flow of hydraulic fluid to the actuator member, and
- a hydraulic fluid pump configured to pump the hydraulic fluid to the control valve and selectively to the actuator member in response to actuation by one or more lobes of a camshaft;
- and
- an engine control unit (ECU) configured to control a variable stroke of the stroke member by controlling the control valve to deliver a controlled amount of hydraulic fluid pressure to the actuation member based on one or more operating parameters of the engine.
A method, comprising:
- receiving, at an engine control unit (ECU) having one or more processors, one or more operating parameters of a direct injection (DI) engine;
- and
- controlling, by the ECU, a stroke of a stroke member of a DI fuel pump by controlling a control valve of a variable fuel pump actuator assembly associated with a cylinder head of the engine based on the one or more engine operating parameters,
- the variable fuel pump actuator assembly including an actuator member configured to actuate the stroke member, a hydraulic fluid pump configured to pump hydraulic fluid to the actuator member and be actuated by one or more lobes of a camshaft of the DI engine,
- wherein the control valve is configured to control a variable stroke of the stroke member by delivering a predetermined amount of hydraulic fluid flow to the actuator member, wherein the stroke member is a plunger, and wherein the actuator member includes a piston.
Dependencies are inferred from the claim text.