Linde 350 Series Service Training page 29

Service Training
If the engine power is exceeded (engine stalls), the electronic controller will reduce the pump swashplate
angle (reduced power demand) until the engine speed (actual value) corresponds again to the value specified
with the accelerator pedal. Through this variance comparison of the engine speed, the power demand of
the working hydraulics is also included in the controller.
WORKING HYDRAULICS SPEED CONTROL
Two pressure switches, 6 and 14 bar, are screwed into the signal port for the engine speed on the working
hydraulics way valve block. When a pressure of 6 bar is reached, one switch transmits a signal to the
electronic controller which cause the engine to accelerate to approx. 1200 RPM (tilting and auxiliary
hydraulics).
When lifting, the 14 bar switch will put out a signal and the engine speed will increase to the maximum limit.
SPEED CONTROL WITH SPEED SIGNAL FROM ACCELERATOR PEDAL AND WORKING HYDRAULICS
The engine speed and the position of the pump swashplate angle are controlled by the electronic controller
based on the position of the accelerator pedal. If a higher speed signal is entered into the electronic controller
by the working hydraulics than already specified by the accelerator pedal, the controller will respond to the
higher value and increase engine speed. As the actual engine speed now exceeds the value specified by
the accelerator pedal, the electronic controller reduces the pump swashplate angle to prevent an increase
in truck speed. The response is so fast that the driver will not notice a change in speed.
BRAKING
The time required to set the swashplate angle from Q
controller. In order to obtain a braking deceleration nearly uninfluenced by the load condition on the engine,
the electronic controller regulates the pump swashplate angle dependent on the engine speed within a fixed
time.
REVERSAL OF DIRECTION OF TRAVEL
When reversing the direction of travel, the signals for the new direction and the engine speed are only
released when the electronic controller has sensed the neutral (zero) position of the variable pump. (This
ensures that the engine speed drops to low idle speed and will increase only when the new direction has
been selected.).
to Q or from Q to Q
min max max
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is specified by the electronic
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