| 摘要 |
In a reciprocating internal combustion engine, which may be turbocharged or normally aspirated, the inlet manifold is connected by a duct 10 to a bypass 9 which in turn connects the crankcase 8 to a point upstream of the throttle. Non-return valves 11 and 12 are disposed in the duct 10 and bypass 9 respectively. An adjustable diaphragm valve 14, whose operation is controlled by the pressure in a pressure sensor line 15 leading to crankcase 8, is disposed in a bypass 13 to the valve 12. The arrangement operates to prevent crankcase overpressure under normal operating conditions of the engine.
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