Four-wheel steering control system and control method therefor

A control method for a four-wheel steering control system, the method being applied to a four-wheel steering control system that comprises:

• a front drive axle and a front drive cylinder, wherein the front drive cylinder is drivingly connected to the front drive axle;
• a rear drive axle and a rear drive cylinder, wherein the rear drive cylinder is drivingly connected to the rear drive axle;
• a first reversing valve and a second reversing valve, wherein a first working oil port of the first reversing valve communicates with one oil chamber of the front drive cylinder, a second working oil port of the first reversing valve communicates with an oil inlet of the second reversing valve, an oil return port of the second reversing valve communicates with another oil chamber of the front drive cylinder, and two working oil ports of the second reversing valve communicate with two oil chambers of the rear drive cylinder one to one;
• a switch valve, wherein the oil return port of the second reversing valve communicates with an oil tank through the switch valve;
• and
• a first detection member and a second detection member which are disposed on the front drive axle and the rear drive axle respectively and are configured to detect position states of front wheels and rear wheels respectively, wherein the position states comprise a middle position, a left side of the middle position, and a right side of the middle position;
• the first detection member is configured to output a first signal in response to the front wheels being in the middle position, and the second detection member is configured to output a first signal in response to the rear wheels being in the middle position;
• and the first detection member is configured to output a second signal in response to at least one of the front wheels being not in the middle position, and the second detection member is configured to output a second signal in response to at least one of the rear wheels being not in the middle position;
• and
• the method comprising:
• in a front-wheel steering mode, controlling the first reversing valve to switch to a first work position, the second reversing valve to maintain a middle position, and the switch valve to maintain a closed position, so as to drive front wheels to steer in a first direction;
• or controlling the first reversing valve to switch to a second work position, the second reversing valve to maintain the middle position, and the switch valve to maintain the closed position, so as to drive the front wheels to steer in a second direction;
• and
• in a rear-wheel steering mode, controlling the first reversing valve to switch to the second work position, the second reversing valve to switch to a second work position, and the switch valve to switch to a conduction position, so as to drive rear wheels to steer in the first direction;
• or controlling the first reversing valve to switch to the second work position, the second reversing valve to switch to a first work position, and the switch valve to switch to the conduction position, so as to drive the rear wheels to steer in the second direction.