| 摘要 |
<p>A fluid control system for cleaning exhaust gases of an internal combustion engine by injecting additional air into the exhaust manifold of the downstream of the combustion chamber of the engine according to the engine operating conditions. This system includes a vacuum control valve which supplies vacuum on-off signals to a flow control valve device which meters injecting of additional air. The vacuum control valve device includes a housing, a diaphragm dividing the housing into a first chamber communicating with the engine intake manifold which forms a vacuum source and a second chamber communicating with atmosphere, a valve assembly securely fixed to a center portion of the diaphragm and having a passage intercommunicating the first and second chambers and a valve body normally closing the intercommunicating passage, a solenoid device provided in the second chamber for on-off driving of the diaphragm in response to on-off signals, and a stopper adapted to open the intercommunicating passage by pressing the valve body when the valve assembly is displayed by a predetermined distance for feeding vacuum signals proportional to the engine load from an output port of the housing to a flow control valve when on-off signals are supplied to the solenoid device.</p> |
