Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Ernest Fuhrmann

Ulrich Lehmann

Turbocharging apparatus for an internal combustion engine is provided which includes an exhaust gas driven turbocharger with an exhaust gas line leading to an exhaust turbine thereof to drive the same. In order to control the supply of exhaust gases to the exhaust turbine, a control valve is provided between the exhaust line and atmosphere for selectively venting a portion of the exhaust gases. The position of the control valve is in turn governed by a movable diaphragm communicated with charging air pressure by way of a regulating device, which regulating device is responsive to both the charging air pressure and the temperature of the cylinder head of the engine, to precisely control the turbocharger. In one preferred embodiment, the temperature responsive control includes a servomotor arranged in a circuit with a temperature dependent resistance, a difference-amplifier, and a potentiometer, which servomotor controls valving apparatus communicating charging air pressure to the control valve at the exhaust line. In another preferred embodiment, a temperature dependent resistance is provided which is connected with an electronic stepped circuit control device for controlling the supply of charging air pressure to chambers of a control device for the valve in the exhaust line.

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Maichingen, Austria

Ernest Fuhrmann