| 摘要 |
The oil reservoir (4) is connected through a pump (5) and solenoid-controlled valve (3) to the engine (1). A non-return valve (11) in the delivery pipe (2) prevents oil bleeding into the engine when idle. A by-pass pipe (10), also with non-return valve (6), returns some of the pumped oil to the reservoir side of the pump from the control valve. The delivery and by-pass pipe dimensions are chosen to ensure the minimum delivery needed by the engine when the valve opens the by-pass, and the maximum when it closes it. Opt., the valve is arranged to vary the by-pass flow by intermediate displacement, or oscillatory operation at variable frequency. The valve is controlled by an electronic unit (7) with input from a thermal sensor (8) on the engine, e.g. included in the sparking-plug gasket (12), on the engine, e.g. included in the sparking-plug gasket (12), in air-cooled engines, or immersed in the coolant of liquid-cooled engines. Opt., supplementary control is derived from throttle action (applied (9) direct to the pump this provides an alternative control should the electronic system fail).
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