Caterpillar Inc.

Robert L Hercey

David L Lehman

Thomas Reilly Fenelon

Donald W Heston

Gerald A Hill

Engines having turbochargers with a mechanically actuated wastegate typically control the wastegate in response to the air pressure at an outlet of a compressor portion of the turbocharger. Some engine configurations don't provide enough compressor outlet pressure variation to suitably control the wastegate. In the present invention, a control strategy is provided for opening and closing a wastegate based on exhaust gas pressure.

Method and apparatus to control a turbocharger wastegate using exhaust pressure

A bypass system for a diesel engine having a turbocharger, a bypass conduit, a valve and a controller which cooperate to bypass a portion of the combustion air compressed by the turbocharger bypassed to a turbine portion of the turbocharger or to the atmosphere, a controller containing maps based on empirical fixed point data specific to the engine, turbocharger and bypass system responds to signals indicative of changes in atmospheric pressure, inlet manifold pressure and engine speed to control the valve and prevent the turbocharger from surging.

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Peoria, IL, United States of America

Robert L Hercey