Engineering mechanical vehicle, vehicle steering following control system and vehicle steering following control method

Abstract

An engineering mechanical vehicle, a vehicle steering following control system and a vehicle steering following control method. The system comprises a control valve group (10), a steering actuation cylinder (11) and a centering cylinder (12). The control valve group (10) comprises a servo valve (20), a solenoid valve (24), a hydraulic control check valve (21), and a hydraulic control reversing valve (22). The servo valve (20) is connected with the steering actuation cylinder (11); the solenoid valve (24) is connected with the centering cylinder (12). The hydraulic control check valve (21) comprises first oil ports (B1, b1), second oil ports (B3, b3), and control oil ports (B2, b2); the first oil ports (B1, b1) of the hydraulic control check valve (21) are connected with the steering actuation cylinder (11); the second oil ports (B3, b3) of the hydraulic control check valve (21) are connected with an oil returning tank (T). The hydraulic control reversing valve (22) comprises a control oil port (C1) and a working oil port (C2); the control oil port (C1) of the hydraulic control reversing valve (22) is in communication with a hydraulic circuit arranged between the solenoid valve (24) and the centering cylinder (12); the working oil port (C2) of the hydraulic control reversing valve (22) is connected with the control oil ports (B2, b2) of the hydraulic control check valve (21). Hence, fast response of the steering actuation cylinder (11) in following and steering processes is improved and meanwhile, a fast lockout function of the hydraulic control check valve (21) is ensured.

Description

technical field [0001] The invention relates to the field of vehicle steering, in particular to an engineering machinery vehicle, a vehicle steering follow-up control system and a vehicle steering follow-up control method. Background technique [0002] In the prior art, a device used for a series of actions such as changing direction or maintaining direction is called a vehicle steering system (steering system). The function of the vehicle steering system is to control the driving direction of the vehicle according to the driver's operation. The vehicle steering system is very important to the driving safety of the vehicle, so the parts of the vehicle steering system are called security parts. [0003] When the vehicle is turning, in order to resist the steering resistance and allow the driver to easily operate the vehicle, especially large vehicles, power steering is generally used, including hydraulic power steering and electric power steering. The steering angle is also...

AI Technical Summary

Problems solved by technology

The follow-up control method of the patent DE10245618 (A1) is mainly to control the centering of the centering cylinder and the follow-up action with the steering cylinder through the two-position five-way solenoid valve, but the locking performance of the two-position five-way solenoid valve is not ideal. It affects the volumetric efficiency in the steering process, and because the two-position five-way solenoid valve is an uncommon hydraulic component, it indirectly puts forward higher requirements for other hydraulic components, increasing production costs

[0006] In other prior art, there are also two solenoid valves to control the follow-up action of the power steering cylinder and the centering cylinder, but this follow-up control method must ensure that the two solenoid valves are powered on and off at the same time, otherwise It will cause wheel wear and even safety accidents. Therefore, there are potential safety hazards in practical applications.

[0007] How to solve the technical problem of potential safety hazards in the prior art due to the low performance of the steering follow-up system of the centering cylinder and the power steering cylinder is a problem that those skilled in the art need to solve urgently

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