Double electronic valve device

Abstract

The invention relates to a double electromagnetic valve device. The double electromagnetic valve device comprises a valve body (1), a valve shell (2) and a valve cover (3), wherein the valve shell (2) is internally provided with two groups of coils (4), armatures (5) and armature pushers (10), each armature pusher (10) is provided with a return spring (9), the valve body (1) is provided with a pressure oil inlet passage (13) and an oil return passage (15), the two oil passages are respectively communicated with the oil inlet line and the oil outlet line of a rotary valve of an automobile power steering gear to form a bypass oil line which can release partial pressure oil, and combination control is carried out on opening and closing states of two electromagnetic valves in the double electromagnetic valve device to realize flow control on the bypass oil line. The double electromagnetic valve device provided by the invention can output multiple hand power characteristic curves, an automobile can have obvious steering handfeel at high speed; meanwhile, the problem of portability during high-speed emergent steering can be solved, and vehicle control stability and safety can be improved.

Description

technical field [0001] The invention relates to a double solenoid valve device, in particular to an electronically controlled bypass double solenoid valve device capable of changing the flow rate of oil entering a power steering gear of an automobile. Background technique [0002] With the improvement of living standards, people put forward higher requirements for the maneuverability and safety of vehicles. For the automobile power steering system, not only the steering stability at high speed is required, but also the steering portability at low speed is required. At present, the hydraulic power steering system is widely used. When the car is at low speed, such as steering wheel has better portability. , when the speed of the vehicle is fast, it will generate a large boost, making the steering wheel too light to operate, easy to lose the sense of road, resulting in the problem of "fluttering" of the car, and reducing the safety performance of high-speed driving. Conversely...

AI Technical Summary

Problems solved by technology

[0003] Since the traditional hydraulic power steering system only has fixed hand force characteristics, it cannot effectively solve the contradiction between "light" and "smart" steering, as well as the mutual restriction between steering force and road feel, so people propose an electronically controlled hydraulic power steering system to control Flow into the steering gear for lightness at low speeds and good feel at high speeds

Typical solutions are: Chinese patent ZL00210849.6, named "automotive power steering dual-characteristic rotary valve", in which a bypass hole is set between the high and low speed valve ports, and the bypass circuit is controlled by a single solenoid valve, which is closed at low speed The solenoid valve meets the requirements of portability. Open the solenoid valve at high speed to increase the oil return and reduce the steering fluid pressure. However, this scheme only uses a single solenoid valve, which cannot simultaneously output various hand force characteristic curves, and cannot adapt to multi-level changes in steering assistance. Require

Chinese patent 201020646637.5, titled "Electrically Controlled Hydraulic Power Steering System for Vehicles", proposes a steering system scheme that uses multiple independent solenoid valves to open and close to obtain good power assist characteristics, but the scheme passes multiple independent solenoid valves through the pipeline Simple connection, complex structure, space occupation, difficult installation, poor practicability

Chinese patent 200820237155.9, titled "An Electro-hydraulic Steering Oil Pump", uses an electromagnetic proportional valve to adjust the size of the throttle port of the bypass valve, which can solve the problem of losing road feel when the car turns at high speed to a certain extent, but this solution The manufacturing precision of the electromagnetic proportional valve itself is high, and the valve core often cannot withstand the high pressure in actual use, and the phenomenon of opening instability occurs, which is difficult to control.

The above-mentioned solutions generally have complex structures, high product costs, and difficult control, and it is difficult to obtain the good power-assisted feel required by the driver.

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