阅读说明：本技术 一种双电机电动液压转向助力系统及一种车辆 (Dual-motor electric hydraulic steering power-assisted system and vehicle ) 是由 陈运来 闫帅林 王浩宇 于 2018-07-04 设计创作，主要内容包括：本发明涉及车辆转向控制技术领域,特别是一种双电机电动液压转向助力系统及一种车辆。该车辆包括转向系统和转向助力系统,该转向系统包括转向器,该助力转向系统包括用于连接转向器的双轴转向油泵、第一转向电机和第二转向电机,双轴转向油泵的传动轴从油泵的两端伸出,传动轴的一端连接第一转向电机,传动轴的另一端连接第二转向电机,实现了车辆的液压助力转向,辅助驾驶员进行转向操作,解决了现有双电机带动转向油泵时通过同步带的连接方式容易出现故障的问题。(The invention relates to the technical field of vehicle steering control, in particular to a double-motor electric hydraulic steering power-assisted system and a vehicle. This vehicle includes a steering system and a power steering system, this steering system includes the steering gear, this power steering system is including the biax steering oil pump that is used for connecting the steering gear, first steering motor and second steering motor, the transmission shaft of biax steering oil pump stretches out from the both ends of oil pump, first steering motor is connected to the one end of transmission shaft, the second steering motor is connected to the other end of transmission shaft, the hydraulic power steering of vehicle has been realized, supplementary driver turns to the operation, the problem of breaking down easily through the connected mode of hold-in range when having solved current bi-motor drive steering oil pump.)

1. The double-motor electric hydraulic steering power-assisted system is characterized by comprising a double-shaft steering oil pump, a first steering motor and a second steering motor, wherein the double-shaft steering oil pump is used for being connected with a steering gear, a transmission shaft of the double-shaft steering oil pump extends out of two ends of the oil pump, one end of the transmission shaft is connected with the first steering motor, and the other end of the transmission shaft is connected with the second steering motor.

2. The dual-motor electro-hydraulic steering power-assisted system according to claim 1, further comprising a power-assisted oil path for connecting a steering gear and an oil storage tank disposed on the power-assisted oil path, wherein the dual-shaft steering oil pump is further disposed on the power-assisted oil path.

3. The dual-motor electro-hydraulic steering assist system according to claim 2, further comprising a motor control module consisting of two motor control units, each motor control unit being connected to a steering motor.

4. The dual-motor electro-hydraulic steering assist system of claim 3 wherein the control module is configured to communicatively couple to a vehicle controller.

5. The utility model provides a vehicle, includes a steering system, a steering system includes the steering gear, its characterized in that, this vehicle still includes a power steering system, power steering system includes biax steering oil pump, first steering motor and second steering motor, the transmission shaft of biax steering oil pump stretches out from the both ends of oil pump, the one end of transmission shaft is connected first steering motor, the other end of transmission shaft is connected the second steering motor, power steering system still including connecting the helping hand oil circuit of steering gear, be provided with on the helping hand oil circuit biax steering oil pump.

6. The vehicle of claim 5, wherein the power steering system further comprises an oil reservoir, and the power assist circuit is provided with the oil reservoir.

7. The vehicle of claim 6, characterized in that the power steering system further comprises a motor control module consisting of two motor control units, each motor control unit being in control connection with a steering motor.

8. The vehicle of claim 7, wherein a vehicle control unit is disposed on the vehicle, and the control module is communicatively coupled to the vehicle control unit.

Technical Field

The invention relates to the technical field of vehicle steering control, in particular to a double-motor electric hydraulic steering power-assisted system and a vehicle.

Background

At present, a hydraulic power-assisted steering system is adopted by a large commercial vehicle, and a power-assisted pump required by a steering actuating mechanism (a steering gear) provides large pressure and flow because the actual load and a steering axle of the hydraulic power-assisted steering system are relatively heavy. Most vehicles at present are provided with a steering motor and a control unit for driving a hydraulic steering pump. Most commercial vehicles are equipped with a steering motor and control unit to drive a hydraulic steering pump. The single steering motor and the control unit bear larger load, which firstly causes large long-term load, large noise and easy aging; and secondly, a set of steering motor and a control unit are easy to break down, so that the potential safety hazard of driving is caused.

The patent document with Chinese patent publication No. CN103625544A discloses a dual-motor driving device of an electric hydraulic power steering oil pump, wherein a main driving motor directly drives the oil pump to rotate, an auxiliary driving motor works in time, the working states of the dual-motor, such as rotating speed, torque and the like, are adjusted according to signals, such as the rotating speed of a steering wheel, the vehicle speed, the current of the two motors and the like, acquired by an electronic control unit ECU, and the two signals are coupled through a synchronous belt and a belt wheel by means of power of a one-way clutch, so that the control freedom degree of a steering system is improved, the low-speed steering is portable, the high-speed road feel is good, the motors only work at high speed when power is needed, the low-speed steering is carried out when the power is not turned, the energy consumption is low, when one. The problems that the single motor is large in load, large in noise, easy to age, easy to break down in a control unit, and has potential safety hazards in driving and the like can be solved to a certain extent.

However, when the auxiliary driving motor of the above-mentioned device is coupled with the main driving motor through the synchronous belt, the synchronous belt is easy to have the following disadvantages: the belt has poor environmental adaptability and is easy to break due to expansion with heat and contraction with cold; when the service life is longer, the tension becomes small and is loosened, and the reliability is poor due to easy slipping; and the mechanical efficiency of belt connection is low; and the problem that the motors at the two ends of the steering pump work asynchronously due to belt connection, and the bearings at the two ends of the steering pump can be twisted off asynchronously and the like.

Disclosure of Invention

The invention aims to provide a double-motor electric hydraulic steering power-assisted system, which is used for solving the problem that faults are easy to occur through a synchronous belt connection mode when a steering oil pump is driven by the existing double motors. The invention also provides a vehicle.

In order to realize the hydraulic power-assisted steering of a vehicle, a driver is assisted to perform steering operation, and the problem that faults easily occur in the connection mode of a synchronous belt when the conventional double motors drive a steering oil pump is solved. The invention provides a double-motor electric hydraulic steering power-assisted system which comprises a double-shaft steering oil pump, a first steering motor and a second steering motor, wherein the double-shaft steering oil pump is used for being connected with a steering gear, a transmission shaft of the double-shaft steering oil pump extends out of two ends of the oil pump, one end of the transmission shaft is connected with the first steering motor, and the other end of the transmission shaft is connected with the second steering motor.

Furthermore, the power-assisted steering system further comprises a power-assisted oil path used for connecting a steering gear and an oil storage tank arranged on the power-assisted oil path, and the double-shaft steering oil pump is further arranged on the power-assisted oil path.

Furthermore, the power steering system also comprises a motor control module consisting of two motor control units, and each motor control unit is connected with one steering motor in a control mode.

Further, the control module is used for being connected with the whole vehicle controller in a communication mode.

The invention also provides a vehicle which comprises a steering system, wherein the steering system comprises a steering gear, the vehicle also comprises a power-assisted steering system, the power-assisted steering system comprises a double-shaft steering oil pump, a first steering motor and a second steering motor, a transmission shaft of the double-shaft steering oil pump extends out of two ends of the oil pump, one end of the transmission shaft is connected with the first steering motor, the other end of the transmission shaft is connected with the second steering motor, the power-assisted steering system also comprises a power-assisted oil path connected with the steering gear, and the double-shaft steering oil pump is arranged on the power-assisted oil path.

Further, the power steering system further comprises an oil storage tank, and the oil storage tank is arranged on the power-assisted oil path.

Furthermore, the power steering system also comprises a motor control module consisting of two motor control units, and each motor control unit is connected with one steering motor in a control mode.

Further, a vehicle control unit is arranged on the vehicle, and the control module is in communication connection with the vehicle control unit.

Drawings

FIG. 1 is a schematic structural view of a dual motor electro-hydraulic steering assist system;

fig. 2 is an electrical schematic diagram of a dual motor electro-hydraulic steering assist system.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The invention provides a vehicle which comprises a steering system, wherein a steering gear is arranged in the steering system, the vehicle also comprises a power-assisted steering system, the power-assisted steering system is preferably a hydraulic power-assisted steering system, the system comprises a double-shaft steering oil pump, a first steering motor and a second steering motor, a transmission shaft of the double-shaft steering oil pump extends out of two ends of the oil pump, one end of the transmission shaft is connected with the first steering motor, the other end of the transmission shaft is connected with the second steering motor, the power-assisted steering system also comprises a power-assisted oil way connected with the steering gear, and the double-shaft steering oil pump is arranged on the power-assisted.

The first steering motor is in driving connection with the transmission shaft through a first connecting mechanism, and the second steering motor is in driving connection with the transmission shaft through a second connecting mechanism; the first connecting mechanism and the second connecting mechanism can be connecting blocks or couplings.

The hydraulic power-assisted steering system is mainly applied to large commercial vehicles with large loads, can meet the requirements that the load of a real vehicle and a steering axle are relatively heavy, and a steering execution mechanism, namely a power-assisted pump required by a steering gear, provides large pressure and flow. The system can provide large steering power for the whole vehicle, improve the reliability of the steering power system and prolong the service life of the steering power system.

The steering power-assisted system further comprises an oil storage tank, wherein the oil storage tank is arranged on the power-assisted oil path, and the oil storage tank is used for forming power assistance for steering of the vehicle by applying the pressurization of the steering oil pump to the steering gear in the form of hydraulic energy.

The power steering system also comprises a motor control module consisting of two motor control units, and each motor control unit is connected with one steering motor in a control mode. The control module is used for being in communication connection with the whole vehicle controller, and the two motor control units are also in communication. Meanwhile, each motor control unit and the corresponding motor can be arranged in an integrated mode, and the motor control units and the corresponding motors can also be arranged independently and connected through cables.

Under normal conditions, two sets of steering motors and corresponding control units simultaneously drive the double-shaft steering pump, and the two sets of steering motors respectively bear half of load, so that the two steering motors always work under a light-load working condition. Under special working conditions, when one set of steering motor and the corresponding control unit are in failure, the other set of steering motor and the corresponding control unit work independently to independently drive the hydraulic steering oil pump, so that continuous and stable hydraulic steering assistance is provided for the whole vehicle, and the driving safety of the whole vehicle is ensured.

As shown in fig. 1, the steering assist system applies hydraulic oil in an oil tank 4 to a steering gear 5 as hydraulic energy by pressurization of a steering oil pump 1, and assists steering of a vehicle. Normal operation is clockwise when viewed from the shaft end L2 and normal operation is counterclockwise when viewed from the shaft end L1. The second steering motor 3, M2, must work counterclockwise when viewed from its shaft end; the first steering motor 2, i.e. M1, must operate clockwise, as seen from its axial end. As shown in fig. 2, the control unit C2 controls the second steering motor M2 to operate counterclockwise; the control unit C1 controls the first steering motor M1 to operate clockwise.

Because the conventional internal combustion engine commercial vehicle generally only has a 24V low-voltage power supply, a driving system in the electric commercial vehicle supplies power for a high-voltage power supply, and a whole vehicle lighting and control system is a low-voltage power supply. The requirements for the power supply and steering motor and control unit assembly are therefore as follows:

if the vehicle is a traditional internal combustion engine commercial vehicle, two sets of steering motor and control unit assemblies and the corresponding power supply 7 adopt a low-voltage type; if the electric commercial automobile is adopted, the two sets of steering motors, the control unit assemblies and the corresponding power supplies 7 can be of a high-voltage type or a low-voltage type.

In addition, according to the above structure, it is required that the first steering motor M1 and the second steering motor M2 should be identical motors of the same type, the same model, etc., the input power and the input control signals are identical, and the two control units C1 and C2 should communicate with the vehicle control unit 6, respectively, in addition to the mutual communication. a. b are CAN _ H, CAN _ L communication interfaces respectively; c is an ignition signal, namely enabling control signals of the two steering motors and the control unit.

The working conditions of the two steering motors and the control unit CAN be known through CAN communication, one of the steering motors and the control unit has a fault, and the whole vehicle controller controls the other steering motor and the other control unit to immediately and independently work through CAN communication and drive the steering oil pump so as to provide steering assistance for the whole vehicle.

The construction of the steering gear, the steering wheel, the knuckle arm, the steering wheel, etc. is well known and will not be described in detail.

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.