Pure electric vehicle steering pump control system

Abstract

A pure electric vehicle steering pump control system comprises an ignition switch, a hand brake switch, a gear switch and a whole vehicle controller, the ignition switch is connected to the whole vehicle controller through a CAN line, the hand brake switch is connected to the whole vehicle controller through a CAN line, and the gear switch is connected to the whole vehicle controller through a CAN line; when a vehicle is at an idle speed, the electric steering pump provides a small rotating speed, and noise and vibration are reduced; under the low-speed condition, rated power-assisted steering is provided, and it is guaranteed that steering is light and convenient at the low speed; when the vehicle runs at a high speed, the steering force of the vehicle is increased, the phenomena of vehicle drifting and the like are reduced, the energy consumption is reduced to the greatest extent while the driving safety is guaranteed, and the control strategy only needs program upgrading, does not increase the cost and is suitable for general popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of pure electric vehicle steering, in particular to a pure electric vehicle steering pump control system. Background Art

[0002] With the rapid development of the automobile industry, the requirements for vehicle handling and NVH comfort are getting higher and higher. At present, the steering system of pure electric buses adopts electric hydraulic steering pump power steering.

[0003] The principle of electric hydraulic power steering is that the steering controller inverts the DC voltage of the electric vehicle battery into AC power and provides it to the electric steering pump to make the electric steering pump work. The electric steering pump drives the steering fluid to provide assistance to the hydraulic power steering device. At present, the control strategy of most steering pumps is that the steering controller only outputs one frequency, so that the electric steering pump runs at a specified maximum speed. This can only ensure the ease of operation when driving at low speeds. However, when the vehicle is driving at high speeds, the steering force of the vehicle is too light, and there are phenomena such as floating, resulting in poor control feel and unnecessary energy consumption. The steering pump noise is more obvious when the vehicle is idling. Therefore, it is imperative to optimize the control strategy of the steering pump. It is urgent to improve the vehicle's idle NVH comfort and the control feel of users driving at high speeds and reduce energy consumption while ensuring low-speed portability.

[0004] Based on this, in order to improve the vehicle's idling NVH comfort and high-speed driving handling and reduce energy consumption, this design proposes a pure electric vehicle steering pump control system. Utility Model Content

[0005] The utility model aims to provide a steering pump control system for a pure electric vehicle.

[0006] A pure electric vehicle steering pump control system includes: an ignition switch, a handbrake switch, a gear switch, and a vehicle controller, wherein the ignition switch is connected to the vehicle controller via a CAN line, the handbrake switch is connected to the vehicle controller via a CAN line, and the gear switch is connected to the vehicle controller via a CAN line.

[0007] Preferably, the vehicle controller is connected to a vehicle speed sensor, the vehicle controller is connected to a steering pump controller via a CAN line, and the steering pump controller is connected to a steering pump.

[0008] The beneficial effects of the above scheme are:

[0009] 1. When the vehicle is idling, the electric steering pump of the utility model provides a lower speed to reduce noise and vibration. At low speed, it provides rated steering assistance to ensure easy steering at low speed. At high speed, the steering force of the vehicle is increased to reduce drifting and other phenomena, while ensuring driving safety, it reduces energy consumption to the greatest extent. Moreover, the control strategy only needs to be upgraded with a program without increasing costs, and is suitable for general promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the connection relationship structure of the utility model;

[0011] In the figure: 1. ignition switch; 2. handbrake switch; 3. gear switch; 4. vehicle speed sensor; 5. vehicle controller; 6. steering pump control; 7. steering pump. DETAILED DESCRIPTION

[0012] The present invention is further explained in detail below in conjunction with the accompanying drawings of the specification, but the protection scope of the present invention is not limited thereto.

[0013] according to Figure 1 As shown, a pure electric vehicle steering pump control system includes: an ignition switch 1, a handbrake switch 2, a gear switch 3, and a vehicle controller 5, wherein the ignition switch 1 is connected to the vehicle controller 5 via a CAN line, the handbrake switch 2 is connected to the vehicle controller 5 via a CAN line, and the gear switch 3 is connected to the vehicle controller 5 via a CAN line.

[0014] Specifically, the vehicle controller 5 is connected to the vehicle speed sensor 4, the vehicle controller 5 is connected to the steering pump controller 6 via a CAN line, and the steering pump controller 6 is connected to the steering pump 7;

[0015] When the vehicle is powered on, the vehicle controller reads the position information of the ignition switch to determine whether the high voltage is connected. After the high voltage is connected, the vehicle controller reads the speed sensor information to determine the vehicle's driving speed at this moment.

[0016] When the vehicle speed = 0Km / h, the vehicle controller first determines the handbrake on / off information. If the handbrake is not released and the gear is not in the R / D gear, the steering pump will not start; if the handbrake is released and the gear is not in the R / D gear, the vehicle controller determines the load state of the steering pump at this moment by reading the load current information of the steering pump. If the current of the steering pump is <3A, the steering pump runs at 70% of the rated speed. If the current of the steering pump is ≥3A, the steering pump runs at the original speed:

[0017] When the vehicle speed is 0Km / h<40Km / h, the steering pump runs at the rated speed. At low speed, it provides the rated steering assistance to ensure easy steering at low speed.

[0018] When the vehicle speed is greater than 40Km / h, the vehicle controller continues to judge the current load at this moment. When the current of the steering pump is less than 3A, the steering pump runs at 70% of the rated speed. When the current of the steering pump is ≥3A, the steering pump runs at the rated speed. When the vehicle is at high speed, the steering force of the vehicle is increased to reduce the phenomenon of drifting, thereby ensuring driving safety while minimizing energy consumption. In addition, this control strategy only requires program upgrades.

Claims

1. A pure electric vehicle steering pump control system, comprising: An ignition switch (1), a handbrake switch (2), a gear switch (3), and a vehicle controller (5), wherein the ignition switch (1) is connected to the vehicle controller (5) via a CAN line, the handbrake switch (2) is connected to the vehicle controller (5) via a CAN line, and the gear switch (3) is connected to the vehicle controller (5) via a CAN line.

2. A pure electric vehicle steering pump control system as claimed in claim 1, characterized in that: The vehicle controller (5) is connected to a vehicle speed sensor (4), the vehicle controller (5) is connected to a steering pump controller (6) via a CAN line, and the steering pump controller (6) is connected to a steering pump (7).

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