If one presses the accelerator pedal when a diesel engine is running, more fuel is injected in the mid- and upper partial-load range (unregulated area), unless it concerns a pump with an engine speed governor. In the other areas, with the achievement of the allowed maximum RPMs, at the starting RPMs, in neutral, and perhaps in the lower partial-load range, with the axial piston pump, a regulation always takes place. The drivers wish does not directly affect the injection amount.
How it works
For the volume-regulation, the control gate valve is shifted by the accelerator pedal. In this process, under certain working conditions, the centrifugal force regulator engages. If the control-gate valve is shifted in the direction of the high pressure area, it opens the spill port later, the conveyor stroke becomes longer and the injected fuel amount greater. Movement in the other direction of leads to zero delivery. The control-gate valve is connected with a group of controlling levers, on which, up to five different springs, the accelerator pedal position and the centrifugal governor have an influence. The maximum RPM control spring enables the centrifugal governor to shift the control gate valve in the direction of zero delivery regardless of the accelerator pedal position. Below the maximum RPMs, the pre-tensioned maximum RPM control spring causes a rigid connection and thus, an unregulated area. The weaker compensation spring and the intermediate spring regulate in the lower partial-load range, the even smaller idling spring allows a stable idle running and the start-up spring, construed for very low RPMs, enables reliable starting by providing the highest possible injection amount. 01/10