Electro-hydraulic power-assisted steering system and control method thereof
阅读说明：本技术 一种电动液压助力转向系统及其控制方法 (Electro-hydraulic power-assisted steering system and control method thereof ) 是由 孟天宝 李振山 陈运来 闫帅林 王浩宇 吴海波 谭二雷 于 2018-07-04 设计创作，主要内容包括：本发明涉及车辆控制技术领域,特别是一种电动液压助力转向系统及其控制方法。该系统包括转向电机、用于向转向器提供液压能的转向油泵、电机控制器和设置于转向电机中的电流信息采集模块；转向电机通过离合器驱动连接转向油泵,电流信息采集模块用于采集转向电机的电流信息；电机控制器判断电流值与电流设定值的大小关系,若电流值大于电流设定值且持续第一设定时间,则电机控制器控制离合器结合；若电流值小于电流设定值且持续第二设定时间,则电机控制器控制离合器分离；实现了车辆的转向助力,解决了现有驱动电机与离合器控制存在响应时差导致驱动电机转速大幅突变造成的电机寿命降低的问题。(The invention relates to the technical field of vehicle control, in particular to an electro-hydraulic power steering system and a control method thereof. The system comprises a steering motor, a steering oil pump for providing hydraulic energy for a steering gear, a motor controller and a current information acquisition module arranged in the steering motor; the steering motor is connected with the steering oil pump through the driving of the clutch, and the current information acquisition module is used for acquiring current information of the steering motor; the motor controller judges the magnitude relation between the current value and the current set value, and if the current value is greater than the current set value and lasts for a first set time, the motor controller controls the clutch to be combined; if the current value is smaller than the current set value and lasts for a second set time, the motor controller controls the clutch to be separated; the steering assisting device realizes the steering assisting of the vehicle and solves the problem that the service life of the motor is reduced due to the fact that the rotating speed of the driving motor is greatly changed suddenly due to the fact that the response time difference exists between the existing driving motor and the clutch.)
1. A control method of an electro-hydraulic power steering system is characterized by comprising the following steps:
1) acquiring current information of a steering motor;
2) judging the magnitude relation between the current value and the current set value, and controlling the clutch to be combined if the current value is greater than the current set value and lasts for a first set time; and if the current value is less than the current set value and lasts for a second set time, controlling the clutch to be separated.
2. The electrohydraulic power steering system control method according to claim 1, wherein the current set value is a static current value of a steering motor corresponding to a non-operation of the steering gear.
3. The electro-hydraulic power-assisted steering system comprises a steering motor and a steering oil pump, wherein the steering oil pump is used for providing hydraulic energy for a steering gear, and the steering motor is connected with the steering oil pump through a clutch in a driving way; the motor controller is connected with the current information acquisition module in a sampling manner so as to acquire current information of the steering motor; the motor controller judges the magnitude relation between the current value and the current set value, and controls the clutch to be combined if the current value is greater than the current set value and lasts for a first set time; and if the current value is less than the current set value and lasts for a second set time, the motor controller controls the clutch to be separated.
4. The electro-hydraulic power steering system according to claim 3, wherein the current set value is a static current value of the steering motor corresponding to the non-operation of the steering gear.
5. The electro-hydraulic power steering system according to claim 4, further comprising an oil tank and a circulation line for connecting an oil inlet and an oil outlet of a steering gear, wherein the steering oil pump and the oil tank are disposed on the circulation line.
Technical Field
The invention relates to the technical field of vehicle control, in particular to an electro-hydraulic power steering system and a control method thereof.
Background
The mainstream electric commercial vehicle, electric bus etc. all adopt the motor and turn to the mode that the oil pump passes through flexible coupling direct linking to each other in the market at present, and electric steering oil pump is when receiving whole car enable signal like this, and the motor drives always turns to the oil pump operation, and hydraulic oil is in the circulation flow state in a steering system, when increasing energy consumption, also can increase a steering system's temperature to along with the noise of fluid pulse, influence the promotion of whole car feel.
The patent document with Chinese patent publication No. CN103112351B discloses an electric vehicle and an auxiliary engine driving device and an auxiliary engine driving system thereof, which comprise a driving motor and a power-assisted steering pump in driving connection with the motor, wherein the driving motor and the power-assisted steering pump are controlled to be separated and combined through a clutch, and the whole vehicle controller controls the separation and the combination of the clutch through a steering signal under the judgment condition, so that the response effect of steering assistance is ensured, the energy consumption is reduced, the vibration of the driving motor is absorbed, and the system noise is reduced.
The separation of mode control clutch through the turn signal still uses this turn signal control driving motor's operation with the in-process that combines, but according to the characteristics of driving motor and clutch itself, driving motor's response speed is slower than the response speed of clutch, if when needing the power assisted steering, driving motor has not reached corresponding rotational speed according to the turn signal yet, driving motor rotational speed this moment is lower, and the clutch closure can cause driving motor's rotational speed to reduce suddenly this moment, lead to the power assisted steering to appear fluctuating by a wide margin, influence driver's steering control experience, and cause the influence to driving motor's bearing easily, reduce driving motor life.
Disclosure of Invention
The invention aims to provide an electro-hydraulic power-assisted steering system and a control method thereof, which are used for solving the problem that the service life of a motor is shortened due to the fact that the rotating speed of a driving motor is greatly suddenly changed due to the fact that the response time difference exists between the existing driving motor and a clutch.
In order to realize the steering assistance of a vehicle, the problem that the service life of a motor is reduced due to the fact that the rotating speed of the driving motor is greatly suddenly changed due to the fact that the response time difference exists between the existing driving motor and the clutch control is solved. The invention provides a control method of an electric hydraulic power-assisted steering system, which comprises the following steps:
1) acquiring current information of a steering motor;
2) judging the magnitude relation between the current value and the current set value, and controlling the clutch to be combined if the current value is greater than the current set value and lasts for a first set time; and if the current value is less than the current set value and lasts for a second set time, controlling the clutch to be separated.
Further, the current set value is a static current value of the steering motor corresponding to the steering gear when the steering gear is not in motion.
In order to realize the steering assistance of the vehicle, the invention also provides an electric hydraulic power-assisted steering system, which comprises a steering motor, a steering oil pump, a motor controller and a current information acquisition module, wherein the steering oil pump is used for providing hydraulic energy for a steering gear; the motor controller is connected with the current information acquisition module in a sampling manner so as to acquire current information of the steering motor; the motor controller judges the magnitude relation between the current value and the current set value, and controls the clutch to be combined if the current value is greater than the current set value and lasts for a first set time; and if the current value is less than the current set value and lasts for a second set time, the motor controller controls the clutch to be separated.
Furthermore, the current set value in the system is a static current value of the corresponding steering motor when the steering gear is not in motion.
Further, still include the oil storage tank and be used for connecting the oil inlet and outlet's of steering gear circulation pipeline, be provided with on the circulation pipeline turn to the oil pump with the oil storage tank.
Drawings
Fig. 1 is a schematic configuration diagram of an electro-hydraulic power steering system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides an electro-hydraulic power-assisted steering system, which comprises a steering motor 1, a motor controller and a steering oil pump 3 for providing hydraulic energy for a steering gear 5, wherein the motor controller is connected with a current information acquisition module arranged in the steering motor 1 in a sampling manner so as to acquire current information of the steering motor; the motor controller controls the
The steering motor 1 drives a steering oil pump 3 through a
The motor controller is used for carrying out CAN communication on the whole vehicle through a corresponding CAN interface, and the motor controller is used for controlling the current of a steering motor by connecting the high-voltage power distribution of the whole vehicle according to the steering information of the vehicle so as to realize the control of the rotating speed and the frequency of the motor.
The invention provides a control method of an electro-hydraulic power steering system, which is used in the power steering system and comprises the following steps:
1) and acquiring current information of the steering motor.
2) Judging the magnitude relation between the current value and the current set value, and controlling the clutch to be combined if the current value is greater than the current set value and lasts for a first set time; and if the current value is less than the current set value and lasts for a second set time, controlling the clutch to be separated.
When the steering gear is set to have no steering action or within a set steering angle, the motor is in a static state, the static current is a current set value I1, the corresponding static frequency is f1, and the corresponding rotating speed is n 1. The control has a current feedback mechanism, implements the monitoring current magnitude, and realizes the current closed-loop control.
If the current of the steering motor is greater than I1 and the duration time is greater than a first set time t1, controlling the clutch to be combined, controlling the frequency and the rotating speed of the steering motor to increase along with the increase of the current value, driving the steering oil pump to operate by the steering motor, and controlling the transmission ratio to be 1: and 1, starting the hydraulic boosting to work.
If the steering motor current is less than I1 and the duration time is longer than a second set time t2, controlling the clutch to be disengaged, and controlling the steering motor to operate at a frequency f1 corresponding to I1, wherein the corresponding rotating speed is n1, or controlling the rotating speed and the frequency of the steering motor to be reduced along with the reduction of the current value; the power transmission between the motor and the oil pump is cut off, the hydraulic power assisting does not work, and the electric energy is saved. In addition, the second set time may be 0 s.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
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