Westport Germany Gmbh

Westport Power Inc.

Ulrich Hilger

Bernd Bartunek

Kevin Kwame Oversby

Richard Wing

Kenneth R C Mann

John Gordon Crawford

Martin Blank

Ian Hayden Lockley

A high-pressure gas compressor comprises a single-acting cam driven piston with a pressure compensation chamber disposed between the piston and the cam. A roller tappet assembly transmits reciprocating motion from the cam to the piston. A pressurized gas directed to the pressure compensation chamber offsets forces acting on the piston from the compression chamber gas pressure, thereby reducing Hertzian pressure between the tappet roller and the cam. Overall efficiency and durability can be improved by reducing friction between compressor components, for example by employing thin film coatings to reduce friction, pressurized oil lubrication systems and higher cylinder bore diameter to piston stroke ratios. The service life of gas seals and compression efficiency can be improved by thermal management strategies, including liquid-cooled compressor cylinder liners and intercoolers between compression stages. Employing a poppet-style intake valve and reducing parasitic volume in the compression chamber can improve compressor volumetric efficiency.

High-pressure gas compressor and method of operating a high-pressure gas compressor

An internal combustion engine comprises a fuel injection nozzle for injecting a gaseous fuel directly into the combustion chamber. shield, is installed in close proximity to the fuel injection nozzle, provides a shielded space around a hot surface igniter and restricts flow between the shielded space and the combustion chamber. The nozzle comprises a fuel injection port oriented to direct a fuel spray against a surface of the sleeve An inlet in the sleeve allows air and fuel to enter the shielded space to form a combustible mixture therein. The sleeve contains a substantial amount of the combustible mixture within the shielded space until it ignites and pressure builds within the shielded space to propel a combustion flame through at least one discharge opening and into contact with the fuel sprays emerging from the fuel injection nozzle.

Internal combustion engine with injection of gaseous fuel

An internal combustion engine comprises a fuel injection nozzle for injecting a gaseous fuel directly into the combustion chamber. Installed in close proximity to the fuel injection nozzle is an ignition device, comprising a sleeve that provides a shielded space around a hot surface igniter. The sleeve restricts flow between the shielded space and the combustion chamber. An inlet opening in the sleeve allows air and fuel to enter the shielded space to form a combustible mixture therein. The sleeve contains a substantial amount of the combustible mixture within the shielded space until it ignites and pressure builds within the shielded space to propel a combustion flame through at least one discharge opening that is oriented to direct the combustion flame into contact with the fuel spray roots emerging from the fuel injection nozzle.

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Essen, Germany

Ulrich Hilger