Motor thermodynamic protection method for dual-motor steer-by-wire system
A technology of steer-by-wire and steering system, which is applied in the direction of electric steering mechanism, steering mechanism, power steering mechanism, etc. It can solve the problems of motor life impact, safety hazards, and difficulty in guaranteeing motor steering characteristics, so as to ensure steering characteristics and thermodynamic protection prevent effect
Active Publication Date: 2021-08-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
In the steering process, the steering motor is the power source of the steering. Once the motor fails, the steering characteristics of the motor are difficult to guarantee, and there may be a greater safety hazard
The working environment of the steering motor is harsh, and the life of the motor is greatly affected by the temperature of the motor. At the same time, the motor is easily damaged due to overheating and affects the steering performance of the vehicle. Therefore, it is necessary to formulate a corresponding motor thermodynamic protection strategy for the steer-by-wire system. , while ensuring the steering performance of the steer-by-wire system, improve the working conditions of the steering motor and increase the service life of the steering motor
Method used
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[0080] The present invention will be further described below with reference to the accompanying drawings.
[0081] A two-motor wire-controlled steering system structure considering the thermodynamic protection of the present invention figure 1 As shown, including the acquisition unit, a steering wheel assembly, an ECU control module, a main auxiliary double motor execution unit.
[0082]Among them, the acquisition unit is connected to the ECU control module, a steering wheel assembly, a main auxiliary double motor; the acquisition unit includes a steering wheel corner sensor 4, a steering wheel torque sensor 5, a main steering motor torque, and a rotational speed sensor 9, auxiliary Steering motor torque and speed sensor 12, vehicle speed sensor 19, a sensor of the transverse angle velocity sensor collects the car status; and transfer the collected signal or instruction to the ECU control module, the steering wheel assembly, the main auxiliary double motor execution unit, Specific...
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The invention provides a motor thermodynamic protection method for a dual-motor wire-controlled steering system, which uses a model predictive control (MPC) to predict the motor temperature through a motor thermal model. When a motor is overheated, the temperature of the motor can be reduced by reducing the output torque of the motor, and another motor is used for torque compensation. When the overheated motor cools down, the dual motors return to normal work distribution. To sum up, a control strategy for a dual-motor steer-by-wire system that considers motor thermodynamic protection proposed in the patent of the present invention can not only realize the thermodynamic protection of the steering motor of the steer-by-wire system to prevent motor thermodynamic damage, but also ensure the steering characteristics of the car.
Description
Technical field [0001] The present invention relates to the field of motor thermal protection fault tolerance, and is specifically a motor thermodynamic protection method for a two-motor wire-controlled steering system. Background technique [0002] Line-controlled steering as an intelligent electronic control technology increasingly highlights its unique advantages. The line-control steering system can achieve active steering, significantly improve the operation stability of the steering system. The cancellation of mechanical connection increases car stability and operational stability, but the wire control is used to make fault tolerance control into the key to ensuring the safety of line control. Steering execution motors act as a system acting as a system, acts as an important component during the steering process, which has a great influence on the car steering. During the steering process, the steering motor is the power source of the steering. Once the motor is faulty, the...
Claims
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IPC IPC(8): B62D5/04
CPCB62D5/0463B62D5/0487
Inventor 赵万忠王安张寒王春燕陈莉娟匡登明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS