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Engine Compression Release
Coopera/ 3 de Maig de 2012

Engine Compression Release (12 LU 87GA 3OZM)

A large US company is looking for proposals for development of a mechanism that can release cylinder pressure upon cranking a multi-cylinder engine at startup.
They are interested in licensing, product acquisition, contract research, proof of concept leading to scale up to manufacturing, joint development, supplier agreement, etc.

Country: Luxembourg  Date: 26.04.2012

Significant fuel economy gains can be achieved in city driving conditions using engine start-stop systems. Today, high-cost, high energy batteries and cranking motors are needed to perform the required start-stop functions in automobile engines with this feature. Also, newer engine designs are incorporating higher compression ratios to enhance thermal efficiencies. This adds additional torque requirements to the cranking system. Finally, cold start conditions impose additional challenges due to both higher starting torques and reduced battery performance at low ambient temperatures.
To lower the cost and size of electrical starter systems in vehicles, engine compression release mechanisms (either innovative valvetrain designs or other solutions) are desired by our client. A quick patent search reveals 13 patents in the area, however the most recent was in 1998.
Automotive engine designs are substantially different today than they were 14 years ago due to expanded fuel economy and emissions requirements.
Our client invites proposals for the development of a compression release mechanism that reduces unfired pressure pulsations in a multicylinder internal combustion engine (both diesel and high-compression gasoline) for an intermittent period such as during engine start.
The successful mechanism will 1) engage with minimal external effort (or self-engage) in preparation for engine cranking, 2) reduce cylinder compression pressure significantly during the first one or two crankshaft revolutions, 3) disengage with minimal effort prior to the first
engine firing event, and 4) cause no disruption to engine operation.

+Info: Here

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