Failure control method for electric drive system of four-wheel drive electric vehicle
An electric drive system and failure control technology, applied to electric vehicles, control drives, vehicle components, etc., can solve the problems of increased probability of failure of four-wheel drive electric vehicles, affecting the life safety of drivers, and potential safety hazards of electric vehicles. The effect of improving the stability of the vehicle body, avoiding safety hazards, and reducing differences
Inactive Publication Date: 2015-04-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0004] Since there are four electric drive systems in the four-wheel drive electric vehicle at the same time, the probability of failure of the four-wheel drive electric vehicle as a whole increases. At the same time, when some of the four electric drive systems fail, it will lead to potential safety hazards for the electric vehicle. , and even affect the safety of the driver, so a failure control method is needed to ensure that when the electric drive system of the four-wheel drive electric vehicle fails, it can normally perform deceleration and parking operations or maintain the speed of the vehicle.
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[0088] For the total mass of 1296kg, the moment of inertia around the Z axis is 1750kgm2, the wheelbase is 2.57m, the distance from the center of mass to the front axle is 1.25m, the distance from the center of mass to the rear axle is 1.32m, the front wheelbase is 1.405m, the rear wheelbase is 1.399m, and the height of the barycenter is 0.45 m, and a four-wheel drive electric vehicle with a wheel radius of 0.326m is used for verification.
[0089] Figure 5 is the comparison chart of the vehicle trajectory when the left front wheel motor fails, from Figure 5 It can be seen from the figure that under simple control, the four wheels have no driving force, the vehicle speed decreases rapidly, and the turning radius is significantly reduced compared with normal driving; after adding failure control, the vehicle speed and turning radius are almost the same as normal driving.
[0090] Figure 6 Four wheel drive torque curves under failure control. From Figure 6 It can be seen...
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The invention provides a failure control method for an electric drive system of a four-wheel drive electric vehicle. According to the method, firstly, failure types are judged and failure control strategies are selected according to failure of the electric drive system, and the failure is controlled by the aid of different failure control strategies, so that a driver can reliably and safely operate the four-wheel drive electric vehicle. The control target of a vehicle speed keeping failure control strategy includes that the drive torque of a target wheel is enlarged according to the failure, total drive force is maintained, so that the vehicle speed can be kept, the drive performance of the four-wheel drive electric vehicle is kept under the condition of failure, difference between an actual vehicle parameter and an ideal value is decreased by distributing longitudinal force on the target wheel, and stability of a vehicle body is improved. The control target of a speed reducing stop failure control strategy includes that tracks are kept and the vehicle rapidly stops, the running track of the four-wheel drive electric vehicle is consistent with the track of the vehicle without the failure as far as possible, potential safety hazards caused by rapid change of the track of the vehicle can be avoided, and the driving expectancy of the driver is met.
Description
technical field [0001] The invention belongs to the technical field of electric vehicle motor control, and more specifically, relates to a method of how to control when the electric drive system of a four-wheel drive electric vehicle fails, so that the electric vehicle can safely and reliably maintain the vehicle speed or decelerate to stop Control Method. Background technique [0002] In order to cope with increasingly prominent problems such as energy shortage and environmental pollution, electric vehicles have become a research hotspot due to their advantages of low emission and low noise. [0003] At present, the four-wheel drive hub car, that is, the four-wheel drive electric vehicle, will be one of the main directions of future development. Compared with the two-wheel drive electric vehicles used in today's market, since the four-wheel drive electric vehicles have four drive motors, they can run in harsher road conditions and provide greater driving force. At the sam...
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IPC IPC(8): B60L15/32
Inventor 辛晓帅郑汗耕邹见效徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA