Gm Global Technolgoy Operations, Inc.

Stephen F De Nagel

Edward D Klomp

Arun S Solomon

Andrzej M Pawlak

Edward G Groff

An injector for delivering a charge of fuel and air to an engine includes a central passage extending from an air inlet to a valve seat, a poppet valve secured on a valve stem extending through the central passage and engageable with the valve seat, a poppet valve engageable with a valve seat for controlling flow therethrough, a fuel nozzle opening into the air passage near the valve seat, apparatus for periodically metering fuel through the nozzle into the central passage to create a fuel-air charge in the central passage concentrated near the valve seat, and apparatus for periodically disengaging the poppet valve from the valve seat for delivering the fuel-air charge from the central passage.

Fuel injection

A solenoid actuated valve assembly has first and second valve members, first and second valve seats, a solenoid coil, a first armature effective when the coil is energized with a positive current to permit displacement of the first valve member from the first valve seat, and a second armature effective when the coil is energized with a negative current to displace the second valve member from the second valve seat. The first valve member engages the first valve seat when the coil is energized with a negative current, and the second valve member engages the second valve seat when the coil is energized with a positive current.

Solenoid actuated valve assembly

In an engine having direct fuel injection or injection at individual intake ports, the fuel injectors are of the positive displacement type and are equipped with plunger displacement sensors to yield a displacement signal representing the quantity of fuel injected. This signal is used as feedback to a closed loop PID control which compares the injected quantity to a demand quantity to determine an error and calculates a control pulsewidth which reduces the error eventually to zero. An open loop injector calibration of pulsewidth versus approximate fuel quantity is used as a base pulsewidth to which the closed loop adds a correction value.

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Warren, MI, United States of America

Stephen F De Nagel