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Edition 2002BEdition 2002B
7 Steering7 Steering
Design and functionDesign and function
GeneralGeneral
The steering movement The steering movement is transferred completely electronically, without mechanicalis transferred completely electronically, without mechanical
connection between the steering wheel and wheel. The system consists of steering wheel,connection between the steering wheel and wheel. The system consists of steering wheel,
regulator, steering servo unit and servo motor. A monitoring system is regulator, steering servo unit and servo motor. A monitoring system is built into thebuilt into the
steering servo unit, which stops the truck if an electrical fault occurs in steering servo unit, which stops the truck if an electrical fault occurs in the regulatorthe regulator..
SteeringSteering
The steering wheel is mounted in a vertically adjustable panel to allow tThe steering wheel is mounted in a vertically adjustable panel to allow the best possiblehe best possible
adjustment. The steering wheel has no mechancial contact with adjustment. The steering wheel has no mechancial contact with the wheel. All thethe wheel. All the
steering takes place by means of a sensor in the form of a steering takes place by means of a sensor in the form of a step motor under the steeringstep motor under the steering
wheel. The sensor gives a wheel. The sensor gives a signal to the signal to the servo steering regulator, which converts the signalservo steering regulator, which converts the signal
to a drive voltage for the steering servo motor to turn to the right or lefto a drive voltage for the steering servo motor to turn to the right or left, depending on thet, depending on the
direction of rotation of the steering wheel, see section 10.direction of rotation of the steering wheel, see section 10.
The steering servo motor is The steering servo motor is of the 3-phase induction motor type. of the 3-phase induction motor type. The turning movementThe turning movement
is limited by is limited by means of two limit smeans of two limit switches, S4 and S5. These are placed in the motor witches, S4 and S5. These are placed in the motor bedbed
and stop the turning and stop the turning movement before the mechanical end stop is movement before the mechanical end stop is reached.reached.
TTo maintain control of o maintain control of the acceleration during hard turns there the acceleration during hard turns there is also a 45° is also a 45° sensorsensor, S8,, S8,
on some trucks, placed in the motor bed..on some trucks, placed in the motor bed..
Figure 7.1Figure 7.1 Limit switch S4 and S5.Limit switch S4 and S5.
07_004_SM_A-Ergo_S4S5S8.eps
07_004_SM_A-Ergo_S4S5S8.eps
S4, S5S4, S5
S8S8
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