User Manual

10/16 Bosch Rexroth AG Mobile Hydraulics
Dual Path Control DPC
RE 95 325/03.04
Steering Behavior
Steering behavior is controlled by two variables:
• The steering direction and the setpoint are defined by the
steering potentiometer.
• The control of the PWM outputs for the specified setpoint
is defined on the basis of a variable steering behavior curve.
Four curves are available (linear, hard, medium, soft).
The steering potentiometer is in the neutral position if it is po
-
sitioned within a user-definable range around the zero position
(dead band).
The steering angle is set when the steering potentiometer is
moved to a position outside the dead band. The actual current
at the PWM outputs changes depending on the deflection of
the lever and the selected curve. The corresponding propor
-
tional solenoids of the left and right pumps are actuated.
Setting the drives to slip steering, so as to achieve the smallest
possible turning radius, can only be done with the vehicle at a
standstill. Slip steering is turned on and off by a switch on the
vehicle.
Steering Regulation
During the commissioning of the vehicle, steering regula-
tion can be activated to make it easier to control the steering
behavior.
The setpoint defined with the steering potentiometer deter
-
mines the steering angle. The steering function is realized
by having the hydraulic motors run at different speeds. The
steering regulation governs the speed ratio of the left and right
hydraulic motors, in such a way that the defined steering angle
is set. To achieve this, the actual speeds of the left and right
hydraulic motors are detected separately by sensors.
Figure 5: Dual path control DPCB: How it works
EMERGENCY STOP (also switches RC off)
Actual speed of left motor
Actual speed of right motor
Stop / Go
Drive setpoint
Max. velocity
Steering setpoint
Slip steering
Steering sensor
Steering sensor position
Automatic steering
Transport mode / work mode
Setpoint
preparation
Setpoint
preparation
Time ramps
Steering behavior
Speed
and
steering regulator
E
M
E
R
G
E
N
C
Y
S
T
O
P
Pump
Left
Pump
Right
Brake
Motor
Left/Right