Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1992-05-06
1993-04-20
Cross, E. Rollins
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
123568, F02M 2506
Patent
active
052033120
ABSTRACT:
An exhaust gas recirculation system for an automotive internal combustion engine includes an exhaust gas recirculation control valve disposed in an exhaust gas recirculation passage connecting intake air and exhaust gas passageways of the engine. The exhaust gas recirculation control valve is controllably operated in response to a signal vacuum or intake vacuum downstream of a throttle valve. The signal vacuum is regulated in response to an engine operating condition by a vacuum control valve. The vacuum control valve has a diaphragm-operated valve member for closing and opening an atmospheric air introduction port through which atmospheric air is introduced to modify or dilute the signal vacuum to be supplied to the exhaust gas recirculation control valve. The diaphragm of the vacuum control valve is biased by springs, in which the biasing force of the springs is controllable by a stepper motor regulated in response to the engine operating condition. During stopping of the engine, the stepper motor is regulated in a manner so that the valve member is maintained at a position remote from the atmospheric air introduction port, thereby preventing the valve member from sticking to a pipe defining the atmospheric air introduction port, due to a sticky material which enters from the intake passageway.
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Cross E. Rollins
Macy M.
Nissan Motor Co,. Ltd.
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