CN114738272A - Speed-following control method for electric steering pump for new energy passenger car - Google Patents

Abstract

The invention discloses a speed following control method of an electric steering pump for a new energy passenger car. When the vehicle speed of the whole vehicle is lower than or equal to a set threshold value V0, the rotating speed of the electric steering pump is omega 1; when the vehicle speed of the whole vehicle is higher than a set threshold value V0, the rotating speed of the electric steering pump is omega 2, and omega 2 is smaller than omega 1. According to the speed-following control method of the electric steering pump for the new energy passenger car, provided by the invention, the flow of the electric steering pump is controlled along with the speed, so that low-speed large flow and high-speed small flow are realized, the purposes of light hand feeling at low speed and heavy hand feeling at high speed are achieved, and meanwhile, the energy consumption of the electric steering pump can be reduced.

Description

A speed-following control method of an electric steering pump for a new energy passenger car

technical field

The invention relates to the field of new energy passenger cars, in particular to a speed-following control method of an electric steering pump for a new energy passenger car.

Background technique

With the rapid development of new energy passenger cars, passenger car energy consumption optimization and handling stability are one of the research tasks of engineers in major OEMs.

Passenger cars generally use hydraulic power steering, and the control of the hydraulic system is not as accurate as the electronically controlled steering system of passenger cars, and the overall size of the passenger car is too large, which makes it easy to "float" when driving at high speed.

The output flow of the electric steering pump is related to the speed of the motor and the displacement of the pump. Generally, the displacement of the pump cannot be changed. To change, only the speed of the motor can be changed. The traditional engine increases with the speed of the vehicle, and the speed of the engine increases, resulting in an increase in the speed of the pump and the speed of the vehicle. The higher the speed, the higher the pump speed and the greater the output flow, resulting in a lighter and more floating direction; the electric vehicle adopts an electric steering pump, and the pump is driven by a motor, which provides conditions for controlling the output flow of the pump.

The present invention designs a new speed-dependent control method for the electric steering pump through the research on the bench test of the electric steering pump and the road test of the actual vehicle, which can achieve large flow at low speed and small flow at high speed, thereby improving driving safety, and at the same time Reduce electric power steering pump energy consumption.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a speed-following control method for an electric steering pump for a new energy passenger car, which improves the steering stability of the whole vehicle and reduces the energy consumption of the electric steering pump.

The technical scheme of the present invention is:

A speed-following control method for an electric steering pump for a new energy passenger vehicle, comprising:

When the vehicle speed is lower than or equal to the set threshold V0, the electric steering pump speed is ω1;

When the vehicle speed is higher than the set threshold V0, the electric steering pump speed is ω2, and ω2<ω1.

Preferably, the rotational speed of the electric steering pump is electrically associated with the vehicle speed signal, and after the vehicle is started, the electric steering pump collects the vehicle speed signal of the entire vehicle.

Preferably, the ω1 is equal to the rated rotational speed ω0 of the electric steering pump.

Preferably, the ω2 is set to be 80%-90% of the rated rotational speed ω0 of the electric steering pump.

The advantages of the present invention are:

The invention provides a speed-dependent control method for an electric steering pump for a new energy passenger vehicle, the flow of the electric steering pump is controlled with the speed, and realizes large flow at low speed and small flow at high speed, so as to achieve the purpose of light hand feeling at low speed and heavy hand feeling at high speed, and at the same time, the electric steering can be reduced. Pump energy consumption.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the present invention is further described:

FIG. 1 is a parameter table of the electric steering pump in the embodiment.

Detailed ways

As shown in FIG. 1 , the parameter table of the electric steering pump used in this embodiment is shown. In this embodiment, the following control method is set for the electric steering pump. The principle is: according to the size of the vehicle speed, determine the rotation speed of the corresponding steering pump. When the vehicle speed is low, the rotational speed of the electric pump is high, and when the vehicle speed is high, the rotational speed of the electric pump is low. Thereby realizing the effect of low-speed large flow and high-speed small flow.

When the vehicle speed is 0-20km/h, the electric steering pump speed is 1200r/min (rated speed);

When the vehicle speed is above 20km/h, the electric steering pump speed is reduced to 1000r/min (low speed).

Steering program: The DCAC driver program changes for the corresponding pump; the VCU program is implemented according to the speed-sequential method.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All modifications made according to the spirit and essence of the main technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims (4)

1. a new energy passenger vehicle electric steering pump with speed control method, is characterized in that, comprises: When the vehicle speed is lower than or equal to the set threshold V0, the electric steering pump speed is ω1; When the vehicle speed is higher than the set threshold V0, the electric steering pump speed is ω2, and ω2<ω1. 2 . The speed-following control method of an electric steering pump for a new energy passenger vehicle according to claim 1 , wherein the rotational speed of the electric steering pump is electrically associated with the vehicle speed signal, and after the vehicle is started, the electric steering pump collects the vehicle speed signal. 3 . 3 . The speed-following control method of an electric steering pump for a new energy passenger vehicle according to claim 1 , wherein the ω1 is equal to the rated rotational speed ω0 of the electric steering pump. 4 . 4 . The speed-following control method of an electric steering pump for a new energy passenger vehicle according to claim 3 , wherein the ω2 is set to 80%-90% of the rated rotational speed ω0 of the electric steering pump. 5 .

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