Servo controlled exhaust gas recycle system
AssigneeRobert Bosch GmbH
InventorWolf Wessel
Life of this patent
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Abstract
An exhaust gas recycle valve adjusts the amount of exhaust gas returned to the induction manifold and the degree of opening of the recycle valve is controlled by the main throttle valve. In one embodiment of the invention, an extended throttle shaft carries a set of contact strips and a complementary shaft, coupled to the exhaust gas valve, carries contact pins which cooperate with the contact strips to open or close an electrical connection between a power source and an electric motor. When the strips and the pins are rotated relative to one another, as when the throttle is moved, the motor is energized and adjusts the position of the exhaust gas valve until the relative position of the strips and the pins is again such as to interrupt conduction.
Claims11
In an exhaust recycle system for an internal combustion engine, said system including adjustable valve means adapted to be opened and closed in accordance with the position of the throttle of the engine, the improvement comprising switch means, composed of two complementary switch parts, the first of said switch parts being attached to and moving with said valve means and the second of said complementary switch parts being attached to and moving with said throttle;
- whereby the cooperation of said first and second switch parts provides a switching action for opening and closing said adjustable valve means.
Dependencies are inferred from the claim text.