| 摘要 |
In a mechanical fuel pump control device for a diesel engine, air at intake manifold pressure is fed to an actuator that is used to control the amount of fuel being injected into the engine cylinders. The mechanism is designed such that an increase in air pressure reduces fuelling and a decrease in air pressure increases fuelling. By this means the engine's (rotational) speed is held substantially constant at a predetermined value, the variation in (rotational) speed with increasing load (speed droop) being controllable within the design by altering the effective rate of fuel increase for given pressure decrease. This mechanism may be mechanically linked to the operator's main control of engine output, such as (1) fully independently, so the governor will continue to operate to control engine fuelling if the engine's (rotational) speed falls below the predetermined value (commonly known as idle speed governing), or (2) so the operator adjusts elements within the mechanism such that the governor continues to function to control the fuelling to try to achieve the (new value of) intake manifold pressure (commonly known as all speed governing).
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