Electric hydraulic steering control device

Abstract

The invention relates to the field of electrically controlled hydraulic steering systems of automobiles and discloses an electric hydraulic steering control device. The electric hydraulic steering control device is characterized by comprising a frequency-voltage converting chip, a voltage comparing module, a logical operation module, a magnetic valve driving module, a power module and an over-current protection module. The electric hydraulic steering control device performs combination control over the opening state and closing state of a magnetic valve according to vehicle speed signals; by the adjustment to bypass flow, good steering feel can be effectively guaranteed; the over-current protection module detects the feedback voltage of a feedback resistor.

Description

technical field [0001] The invention relates to the field of electronically controlled hydraulic steering systems of automobiles, in particular to a bypass device capable of changing the pressure and flow of liquid flowing into a rotary valve of a power steering gear and a control device thereof, which is suitable for commercial vehicles such as large passenger cars and trucks . Background technique [0002] At present, the hydraulic power steering system is widely used in the field of commercial vehicles, which only has fixed hand force characteristics. When the car is running at low speed, the steering wheel has better portability. When the speed is faster, the steering oil pump The speed also rises, resulting in an increase in the flow of hydraulic oil, resulting in greater power assistance, making the steering wheel too light to turn, easy to lose the sense of road, causing the problem of "floating" in the car, reducing the safety performance of commercial vehicles at hi...

AI Technical Summary

Problems solved by technology

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; in the national utility model patent 200820227155.9, an electromagnetic proportional valve is used to adjust the throttling of the bypass valve. The size of the orifice is used to control the flow of hydraulic oil. However, this solution has higher requirements on the precision of the electromagnetic proportional valve itself, and more stringent requirements on the controller, and the needle valve often cannot withstand high pressure in actual use and often opens. Unstable phenomenon; the national utility model patent 200720034596.2 uses a DC motor to directly drive the oil pump, and indirectly controls the flow and pressure of the hydraulic pump by controlling the power supply voltage and current. This structure adds a motor and other connections to the original power steering Mechanism, the structure is more complicated, and the control of the DC motor is also difficult

[0004] The above-mentioned solutions are generally difficult to control, the product cost is high, and the structure is complicated. It is difficult to obtain the good power-assisted feel required by the driver.

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