Stanadyne Operating Company LLC

Stanadyne Corporation

Michael Hornby

Srinu Gunturu

James Bennardi

Michael Kaput

Robert G Lucas

Clark Klyza

Donald Holder

An electric GDI pump is configured to allow fuel being pumped to cool the electric motor and associated motor control/drive circuit, and cool and lubricate a drive region of a high-pressure pump before passing through an inlet check valve of the high-pressure pump. The rotational speed of an electric GDI pump is de-coupled from the rotational speed of the internal combustion engine. In such a fuel supply system, the quantity of fuel pressurized can be regulated by changing the rotational speed of the electric GDI pump. According to aspects of the disclosure an electric GDI pump is driven by a variable speed direct current motor having a motor housing with a fuel inlet and a motor drive shaft connected to a rotor. The electric GDI pump may incorporate a low-pressure pump driven by one end of the drive shaft and an eccentric drive driven by an opposite end of the drive shaft.

Fuel feed for motor-driven high pressure fuel pump

A high-pressure fuel supply pump for a fuel system that supplies a high-pressure fuel injection (GDI) apparatus and a low-pressure fuel injection (PFI) apparatus incorporates an inlet check valve to isolate a low-pressure fuel feed channel in the pump from pressure fluctuations at the inlet of an inlet control valve. Upstream of the inlet check valve, the low-pressure fuel feed channel is connected to a seal chamber surrounding the pumping plunger. Circulating fresh low-pressure fuel through the seal chamber ensures that the pumping plunger and the clearance between the plunger and the pump bore are cooled and lubricated with fuel, even when high pressure fuel is not produced by the high-pressure pump. The low-pressure fuel feed channel is connected to the low-pressure PFI outlet downstream of the seal chamber. This pump configuration provides stable source of low-pressure fuel for a PFI system.

High-pressure GDI pump with low-pressure bypass

An axisymmetric injector hold-down load ring includes an annular body and an odd numbered plurality of resilient arms integrally extending from the annular body. Each resilient arm has a curvature concentric with the annular body and extends in a first circumferential direction along an outer periphery of the annular body an equal circumferential distance from a connection with the annular body to a free end. The free end of each resilient arm includes a contact surface facing axially opposite a first surface of the annular body, the contact surface of each resilient arm is axially offset from the first surface of the annular body an equal axial distance. This configuration positions the connections and contact surfaces in radial alignment so that force is transmitted along the resilient arms between the circumferentially spaced connections and contact surfaces when the load ring is in use.

Axisymmetric injector hold-down load ring

A port fuel injection system includes a fuel pump configured to produce a flow of pressurized liquid fuel at a pressure between 10 and 50 bar. A fuel rail is connected to receive the flow of pressurized liquid fuel from the fuel pump, the fuel rail. A plurality of fuel injectors, including one fuel injector positioned in the intake port of each engine cylinder upstream of the intake valve for the engine cylinder are connected to receive pressurized fuel from the fuel rail. An engine control unit (ECU) receives signals from sensors on the internal combustion engine and is programmed to actuate the fuel injectors to deliver fuel to each engine cylinder over a full range of engine operating conditions. A port fuel injection system with high pressure and fast acting fuel injectors improves fuel delivery and performance over the full range of engine operating conditions.

High pressure port fuel injection system

An electromagnetic fuel injection valve includes a coupling between an armature and the valve member that allows limited relative movement of the valve member and armature in both the opening and closing directions of the valve member. An injector body includes a non-magnetic section to focus magnetic flux and attractive force through the armature and pole. A modular power group reduces the cost of assembly and includes a plastic encapsulated coil that is protected from environmental moisture and corrosion. A valve seat incorporates a valve seal which improves fuel flow past the valve member when the fuel injection valve is in the open position.

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Emerald Isle, NC, United States of America

Michael Hornby