Electrically-controlled hydraulic steering control device

Abstract

The invention discloses an electrically-controlled hydraulic steering control device, which comprises a frequency-voltage conversion chip (1), a voltage comparison module (2), a logical operation module (3), an electromagnetic valve drive module (4), a power module (5), an undervoltage protection module (6) and an overcurrent protection module (7). The control device is applicable to double-electromagnetic-valve bypass flow type electrically-controlled hydraulic steering systems. The control device controls opening and closing of the two electromagnetic valves of the double-electromagnetic-valve device jointly and adjusts the bypass flow to change flow of oil entering a steering gear, so that assisted adjustment can be realized. The electrically-controlled hydraulic steering control device is low in cost, quick in response, low in heat productivity and capable of effectively guaranteeing steering portability of an automobile at low speed and stability of the automobile at high speed, and enables a driver to have a good operating feeling.

Description

technical field [0001] The invention relates to the field of electronically controlled hydraulic steering systems for automobiles, in particular to a double solenoid valve type bypass flow type electronically controlled hydraulic steering control device capable of changing the flow rate of oil entering a power steering gear. 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 ...

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 include: National Patent 201020646637.5 proposes an electronically controlled hydraulic steering system that uses a combination of multiple solenoid valves to open and close to adjust the flow of the bypass branch, but does not involve its corresponding control device; National Patent 200820227155.9 The electromagnetic proportional valve is used to adjust the size of the throttle port of the bypass valve, so as to control the flow of hydraulic oil. However, this scheme requires high manufacturing precision of the electromagnetic proportional valve itself, and the valve core often cannot bear it in actual use. Opening is unstable due to high pressure, and this solution does not mention the corresponding control device; in the national patent 200320118460.1, a stepping motor is used to control the throttle area of ​​the bypass valve to change the flow of hydraulic oil entering the rotary valve. This improvement scheme can solve the problem of losing road feeling when the car turns at high speed to a certain extent, but this form has complex structure, high cost and is not easy to control

[0004] 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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