Electro-hydraulic proportional solenoid valve

Abstract

The invention provides an electro-hydraulic proportional solenoid valve. The valve comprises a valve core, an oil outlet valve sleeve, a guide sleeve, a magnetism isolating ring, a pole shoe and a coil, wherein the magnetism isolating ring is of a non-magnetic material; the two ends of the magnetism isolating ring are connected with the guide sleeve and the pole shoe respectively to form a sleeve; the coil is arranged on the outer side of the sleeve; the oil outlet valve sleeve is provided with at least one oil outlet hole; one end of the oil outlet valve sleeve is in interference fit with the guide sleeve; the outer circumferential surface of the end part at one end of the valve core is provided with at least one oil inlet wedged groove, and the end face is provided with a straight groove which is communicated with the oil inlet wedged groove; the valve core is positioned in the sleeve; the position of the oil inlet wedged groove corresponds to the position of the oil outlet hole and is not overlapped with the oil outlet hole; a pre-tightening screw is arranged in the pole shoe; a return spring is arranged between the pre-tightening screw and the valve core. The assist characteristic of an automobile steering system can be continuously changed with vehicle speed, so the assist effect is better; the valve has the advantages of compact structure, easiness in control and low cost.

Description

technical field [0001] The invention designs an automobile accessory, in particular an electro-hydraulic proportional solenoid valve. Background technique [0002] With the advancement of science and technology and the improvement of living standards, issues such as vehicle control safety, energy saving, and environmental protection are increasingly being paid attention to. At present, the power assist characteristics of the hydraulic power steering system commonly used in vehicles, especially commercial vehicles, are fixed. The design is mainly based on the convenience of steering in situ and at low speeds. Small but the power output of the steering gear is not reduced, so the driver feels "light" when turning the steering wheel, easily loses the "road feel", and reduces the safety of high-speed driving. In the case of overtaking, avoiding, or cornering, the driver is prone to oversteer when he turns the steering wheel quickly, which may cause accidents such as rear-end co...

AI Technical Summary

Problems solved by technology

At present, the power assist characteristics of the hydraulic power steering system commonly used in vehicles, especially commercial vehicles, are fixed. The design is mainly based on the convenience of steering in situ and at low speeds. Small but the power output of the steering gear is not reduced, so the driver feels "light" when turning the steering wheel, easily loses the "road feel", and reduces the safety of high-speed driving

In the case of overtaking, avoiding, cornering, etc., the driver is prone to oversteer when turning the steering wheel quickly, resulting in rear-end collisions, collisions, rollovers and other accidents

[0003] Since the traditional hydraulic power steering system cannot effectively solve the contradiction between "steering lightness" and maintaining "road feel", people have proposed an electronically controlled hydraulic power steering system to control the flow into the steering gear to meet the lightness of the car at low speed steering and high speed. have a good feel

Typical solutions are: Chinese patent ZL00210849.6, named "automotive power steering dual-characteristic rotary valve", this patent uses a single solenoid valve to control the bypass oil circuit, close the solenoid valve at low speed to meet the lightness requirement, and open it at high speed The solenoid valve bypasses the amount of oil entering the rotary valve to reduce the power assist. However, due to the use of a single solenoid valve, the output power boost characteristic curve is single, which cannot meet the requirements of multi-level changes in steering power.

Chinese patent application 201020646637.5, titled "Electrically Controlled Hydraulic Power Steering System for Vehicles", proposes a scheme of using multiple solenoid valves to open and close to obtain multiple booster characteristic curves, but this scheme passes multiple solenoid valves through the pipeline Simple connection, complex structure, space occupation, difficult installation, poor practicability

Chinese patent application 201110367078.3, titled "A Double Solenoid Valve Device", proposes to use the open and closed states of the two solenoid valves in the double solenoid valve device for combined control to realize the flow regulation of the bypass oil circuit, but this solution only It can realize four different bypass flow modes, and output four booster characteristic curves. The bypass oil volume cannot be continuously adjusted, and the change can realize the change of the booster effect with the speed.

[0004] The above-mentioned solutions generally have the disadvantages of complex structure, difficult installation, difficult control, high product cost, etc., and it is difficult to obtain a good road feel that meets the needs of the vehicle at low speed and lightness and changes with the speed of the driver.

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