Gm Global Technolgoy Operations, Inc.

David L Reuss

Tang-Wei Kuo

Paul M Najt

Alan William Hayman

Ko-Jen Wu

Rodney Brewer Rask

Andreas M Lippert

Jennifer L Liedtke

William R Matthes

Gerald A Silvas

Alexandros C Alkidas

Gerald J Schimelfening

A powertrain and a control method therefore are provided wherein ignition of a combustible charge in a combustion chamber of a controlled auto-ignition internal combustion engine equipped with in-cylinder fuel-injection and a spark ignition device is controlled. A spark-discharge plasma channel is generated between the electrodes of the spark ignition device, and the combustible charge is ignited. The spark-discharge plasma channel is moved toward and entrained by the combustible charge, effective to advance phasing of controlled auto-ignition combustion.

Combustion control method for a direct-injection controlled auto-ignition combustion engine

A powertrain, and a control method therefor, are provided, wherein ignition of a combustible charge in a combustion chamber of a controlled auto-ignition internal combustion engine equipped with in-cylinder fuel-injection and a spark ignition device is controlled. The method comprises generating a spark-discharge plasma channel between the electrodes of the spark ignition device, and igniting the combustible charge. The spark-discharge plasma channel is moved toward and entrained by the combustible charge, effective to advance phasing of controlled auto-ignition combustion.

A combustion chamber for a swirl flow two valve spark ignition direct injection engine includes a cylinder with a closed end having a wedge shaped combustion chamber recess. A fuel injector extends through the closed end near a shallow side of the wedge recess. A spark plug extends through the closed end at a deeper part of the wedge recess opposite from the injector. A single pair of laterally spaced intake and exhaust valves control intake and exhaust ports opening into the wedge recess. A piston in the cylinder has an outer diameter and includes a head end having a raised pedestal with a shallow upwardly angled face ending at a raised ridge and enclosing a shallow bowl in the head end. The bowl is generally oval with a major dimension generally aligned with a cylinder centerline through the valves.

Combustion chamber for swirl flow two valve spark ignition direct injection engine

An engine employs a dual mode combustion process including a first combustion mode for light loads utilizing premixed charge forced auto ignition (PCFA) wherein a pulse jet of reacting fuel mixture from a prechamber mixes with an ultra dilute premixed fuel-air charge in a main chamber, causing rapidly expanding combustion that ignites the remaining ultra dilute mixture by compression ignition. This improves efficiency, allows combustion phasing control and reduced NOx emissions. For higher speeds and loads, a conventional second combustion mode is utilized wherein a strong premixed mixture is ignited conventionally with spark ignition and/or pulse jet ignition. Cylinder pressures which would result from compression ignition at the higher speeds and loads are thus reduced providing overall engine operation with reduced emissions, improved fuel economy, and reduced noise through improved control of the combustion process.

Dual mode engine combustion process

A fuel system has a pump which supplies fuel under pressure to a fuel rail for distribution by fuel injectors to the cylinders of an engine. A fuel accumulator, having a volume greater than the volume of fuel required to start the engine, is disposed in fluid communication with the fuel rail to supply a charge of fuel thereto during engine start-up at a pressure level sufficient to cause fuel atomization within the cylinder. The fuel in the accumulator is stored at the ambient pressure. A spring force or a solenoid force is applied to the fuel in the accumulator such that the fuel is ejected into the fuel rail at the required pressure level. A check valve is positioned to prevent fuel flow from the fuel rail to the pump during the initial discharge from the accumulator. The accumulator is refilled by fuel from the pump during normal operation and the fuel therein is reduced to ambient pressure when the engine operation is discontinued.

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Huntington Woods, MI, United States of America

David L Reuss