Novel engineering machine steer-by-wire system

[0021] Example 1:

[0022] see figure 2 , a new type of wire-controlled steering system, mainly including 1-variable pump steering wheel, 2-variable oil cylinder, 3-proportional three-way valve, 4-electromagnetic on-off valve, 5-accumulator, 6-ECU (electronic control unit) , 7-angular displacement sensor, 8-steering wheel, 9-force feedback motor, 10-steering cylinder, 11-hydraulic control check valve, 12-pressure sensor, 13-filling valve, 14-shuttle valve, 15-hydraulic control One-way valve, 16-relief valve, 17-electromagnetic reversing valve, 18-check valve, 19-relief valve, 20-filter, 21-oil tank. The steering wheel of the new construction machinery steering-by-wire system is connected to the ECU through an angular displacement sensor; the ECU is connected to the steering wheel through a force feedback motor; the electrical signal input end of the variable control valve is connected to the output end of the ECU, and the input end of the hydraulic oil of the proportional three

[0023] Embodiment 2:

[0024] see image 3 , the difference from the first embodiment is that the electromagnetic reversing valve is replaced by an electro-hydraulic reversing valve, the electro-hydraulic reversing valve is controlled by an electromagnetic reversing valve, and its control oil source is provided by an external stable oil source.

[0025] Embodiment three:

[0026] see Figure 4 , the difference from the first embodiment is that the control oil of the proportional three-way valve is provided by the accumulator, and the oil provided by the accumulator supplies oil to the proportional three-way valve through the pressure reducing valve.