A digital steer-by-wire system and its control method and device

Abstract

A digital steering by wire system of the present invention is characterized in that it comprises: an angle sensor for collecting the steering angle signal of the steering wheel; a deceleration mechanism for transmitting the steering torque signal of the steering wheel to the force feedback motor according to the steering angle signal collected by the angle sensor; One of the first pressure sensor and the second pressure sensor is used to collect the first pressure signal on the oil return circuit of the digital flow reversing valve, and the other is used to collect the second pressure signal on the oil outlet circuit of the digital flow reversing valve, The displacement sensor is used to collect the piston telescopic displacement signal of the steering cylinder; the controller is used to use the steering angle signal and the steering torque signal converted by the A / D converter as input signals; and the first pressure converted by the A / D converter The signal, the second pressure signal and the displacement signal are used as feedback signals; the target number of steps of the stepper motor is determined according to the input signal and the feedback signal, so as to precisely control the opening size of the digital flow reversing valve.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of construction machinery, and in particular, to a digital steering-by-wire system and a control method and device thereof. Background technique [0002] Loaders are suitable for urban construction sites such as roads, railways, ports, docks, coal, mines, airports, etc. It is mainly used for shoveling, loading, unloading, transporting and other bulk materials, and can also lightly carry Shovel is an indispensable mechanical equipment for national defense engineering, mine construction, urban and rural road construction and water conservancy construction. [0003] With the rapid development of my country's international cooperation and construction, and the competitive pressure of overseas construction machinery manufacturers, the demand for construction machinery is not only large in quantity, but also puts forward quite high requirements for the technical level of construction mach...

AI Technical Summary

Problems solved by technology

[0004] At present, the traditional wheel loader uses the steering gear for walking and steering. The high-pressure oil of the steering pump enters the steering cylinder through the steering gear to control the expansion and contraction of the steering cylinder piston to realize the rotation of the hinge point of the loader. The existing problem is that the general steering The control accuracy of the controller is low, and part of the high-pressure oil overflows back to the fuel tank in actual operation, resulting in a waste of engine energy

In order to solve this problem, with the update of the steering system of the loader, a flow amplification technology has been introduced, which is to use a small flow to control a large flow (the flow of the steering gear acts on the pilot spool of the electromagnetic reversing valve to control the solenoid valve. Valve reversing), although this technology reduces energy consumption under certain conditions, it does not fundamentally solve the problem

Images