SYSTEM / Control System E Mode Control Purpose: Decreases the pump suction torque to 85 % in order to reduce the engine load and im- prove fuel consumption rate. Engine stall is prevented when inferior fuel is used or the machine operates under adverse conditions such as operating at high altitude. Operation: 1. When the E mode switch is turned ON, MC re- ceives the signal. 2. MC calculates a target pump displacement angle according to the signal from the pump delivery pressure sensor. MC compares the target pump displacement an- gle with the actual pump displacement angle de- tected by the pump regulator pressure sensor. 3.
MC actuates the pump control solenoid valve in order to compensate for the difference between the actual and target pump displacement angles, and reduces the main pump displacement angle. Then, the main pump flow rate decreases. Q Flow Rate Decrease E Mode Base Torque Pressure P T166-02-01-006 T2-2-26