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An auxiliary piston device to be used in an internal combustion engine Disclosure Number: IPCOM000022244D
Publication Date: 2004-Mar-02

Publishing Venue

The Prior Art Database


The invention relates to an auxiliary piston device, which is placed in connection with a combustion chamber of an internal combustion engine. Preferably, the auxiliary piston device is used in an internal combustion engine of the type where a fuel-air mixture is self-ignited by the compression heat, such as HCCI-engines. By the use of such an auxiliary piston device, the volume of the combustion chamber may be varied. The auxiliary piston device comprises a controllable outlet port for the exhaust gases from the combustion chamber. Thereby, it is possible to provide an engine braking by the use of the auxiliary piston device. The auxiliary piston device may be used instead of an exhaust valve in the combustion chamber or as a separate unit working together with the ordinary exhaust valves.