US 11,724,734 B2
Full-hydraulic synchronous steering system for low-speed heavy-load vehicle and control method thereof
Guang Xia, Hefei (CN); Peng Shi, Hefei (CN); Yang Zhang, Hefei (CN); Liping Xu, Hefei (CN); Mingzhuo Zhao, Hefei (CN); Jun Gao, Hefei (CN); Meng Yang, Hefei (CN); Shaojie Wang, Hefei (CN); and Baoqun Sun, Hefei (CN)
Assigned to HEFEI UNIVERSITY OF TECHNOLOGY, Hefei (CN)
Filed by HEFEI UNIVERSITY OF TECHNOLOGY, Hefei (CN)
Filed on Sep. 13, 2021, as Appl. No. 17/473,950.
Application 17/473,950 is a continuation of application No. PCT/CN2019/083785, filed on Apr. 23, 2019.
Claims priority of application No. CN201910190247 (CN), filed on Mar. 13, 2019.
Prior Publication US 2021/0404488 A1, Dec. 30, 2021
Int. Cl. B62D 5/08 (2006.01); B62D 5/065 (2006.01); B62D 5/093 (2006.01)
CPC B62D 5/08 (2013.01) [B62D 5/065 (2013.01); B62D 5/093 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A full hydraulic synchronous steering system for a low-speed heavy-load vehicle, comprising a steering control mechanism and a steering actuator;
wherein the steering control mechanism comprises: a steering wheel, a controller, a steering wheel angle sensor, and a rear wheel angle sensor;
the steering actuator comprises: an oil tank (1), an oil pump (2), a load-sensitive solenoid valve (3), an oil discharge solenoid valve (4), an oil replenishment solenoid valve (5), a left-right reversing valve (6), a steering cylinder (7), a hydraulic steering pump (8) and an oil discharge throttle valve (13);
the steering wheel angle sensor is disposed on a drive shaft of the steering wheel, and the steering wheel angle sensor rotates with the steering wheel and is configured to collect a steering wheel angle signal;
the rear wheel angle sensor is disposed on an overhanging section of a left piston rod in a left working chamber of the steering cylinder (7), and is configured to collect a rear wheel angle signal;
an oil outlet of the left-right reversing valve (6) is connected to the hydraulic steering pump (8), and an oil inlet of the left-right reversing valve (6) is connected to the load-sensitive solenoid valve (3) through a main oil line and the oil replenishment solenoid valve (5);
the hydraulic steering pump (8) is connected to the steering wheel through a steering column;
the load-sensitive solenoid valve (3) is disposed on the main oil line, and is located between a branch of the main oil line and the oil pump (2);
two ends of the oil discharge solenoid valve (4) are connected to an oil outlet of the load-sensitive solenoid valve (3) and the oil tank (1), respectively;
two ends of the oil discharge throttle valve (13) are connected to the oil tank (1) and an oil outlet of the oil discharge solenoid valve (4), respectively;
two ends of the oil replenishment solenoid valve (5) are connected to the oil outlet of the load-sensitive solenoid valve (3) and an oil outlet of the hydraulic steering pump (8), respectively;
when steering, the load-sensitive solenoid valve (3) is opened, the oil pump (2) supplies oil to the hydraulic steering pump (8), and the controller performs an oil replenishment operation or an oil discharge operation on the steering cylinder (7) according to the steering wheel angle signal and the rear wheel angle signal collected, so as to implement synchronous steering of a steering wheel angle and a rear wheel angle; and
when there is no steering requirement, the load-sensitive solenoid valve (3) is closed to enable the hydraulic steering pump (8) to be closed, and oil liquid is supplied to other hydraulic circuits for usage through an EF port of the load-sensitive solenoid valve (3).