| 摘要 |
The invention relates to a device for controlling the steering of a commercial vehicle comprising: two front wheels (126, 127) that can be oriented according to a first turning angle by means of at least one first actuator (120); two rear wheels (136, 137) that can be oriented according to a second turning angle by means of at least one second actuator (130); and a power circuit (101) comprising a pressurised fluid source and power components (111, 112, 113, 114, 115) that can transmit the hydraulic power to the actuators, said power components (111, 112, 113, 114, 115) being controllable in such away as to configure the power circuit (101) according to different coupling modes between the front wheels (126, 127) and the rear wheels (136, 137). The inventive device can be characterised in that it comprises a control circuit (151) containing a pressurised fluid source and control components (153, 154, 155, 156, 163) that are electrically controlled by an electrical control unit, said control components (153, 154, 155, 156, 163) being able to transmit hydraulic commands relating to one of said determined coupling modes to the power components (111, 112, 113, 114, 115). Furthermore, the control components are hydraulically connected in such a way that, in the event of a fault in the electrical control of the control components (153, 154, 155, 156, 163), the commands are upheld in such a way as to permanently maintain the configuration of the power circuit (101) according to the current coupling mode between the front wheels (126, 127) and the rear wheels (136, 137).
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