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CN-121973631-A - Trailer mode control method and system of electric automobile and vehicle

CN121973631ACN 121973631 ACN121973631 ACN 121973631ACN-121973631-A

Abstract

The invention belongs to the technical field of automobiles, and particularly relates to a trailer mode control method and system of an electric automobile and the automobile. The method comprises the steps of obtaining fault state information of a vehicle, judging whether the vehicle enters a normal mode or a fault mode according to the fault state information, judging whether the vehicle enters a trailer mode and a trailer prohibition mode from the normal mode and the fault mode by combining user input information confirmation or vehicle state information confirmation, monitoring a steering signal state in real time after entering the trailer mode, controlling an oil pump to maintain a first rotating speed to operate if the steering state is met, monitoring the fault state of the whole vehicle in real time when the vehicle is in the trailer mode, judging whether the vehicle enters the trailer prohibition mode according to the fault state, and sending alarm information if the vehicle enters the trailer prohibition mode. The method is used for solving the problem of real-time monitoring missing after the trailer mode enters and enters. The real-time monitoring steering signal is convenient to enable steering, the fault state is monitored in real time, and reminding is made, so that accidents in the process of trailer are avoided.

Inventors

  • LI ANNAN
  • LIU PENG

Assignees

  • 扬州亚星客车股份有限公司

Dates

Publication Date
20260505
Application Date
20260316

Claims (9)

  1. 1. The trailer mode control method of the electric automobile is characterized by comprising the following steps of: Acquiring fault state information of the vehicle, and judging whether the vehicle enters a normal mode or a fault mode according to the fault state information; Judging whether the vehicle enters a trailer mode and a disabled trailer mode from a normal mode and a fault mode respectively by combining user input information confirmation or vehicle state information confirmation; After entering a trailer mode, monitoring a steering signal state in real time, and if the steering state is met, controlling an oil pump to maintain a first rotating speed to operate; When the vehicle is in the trailer mode, the fault state of the whole vehicle is monitored in real time, whether the vehicle enters the trailer prohibition mode is judged according to the fault state, and if yes, alarm information is sent out.
  2. 2. The trailer mode control method as recited in claim 1, wherein said user input information confirmation comprises the steps of: Monitoring a first switch starting state and a second switch starting state in sequence; If the first switch and the second switch are started, the whole vehicle feeds back a first-stage signal and broadcasts preset voice content; And starting a third switch within the first time threshold to finish confirmation of the user input information.
  3. 3. The trailer mode control method of claim 2, wherein said sequentially monitoring the first switch activation state and the second switch activation state comprises: Monitoring whether the first switch starting switch is larger than a first opening threshold value, and keeping the opening fall-back of the first switch not to exceed a second opening threshold value and the duration to exceed a second time threshold value; And monitoring that the opening and closing times of the second switch reach the first quantity threshold value in the third time threshold value, and meanwhile, the opening and closing interval of the second switch is larger than the fourth time threshold value.
  4. 4. The method of claim 1, further comprising monitoring in real time whether the low voltage circuit is below a first voltage threshold while in the trailer mode, and if not enabling the low voltage circuit, powering emergency lighting and a double flashing light; and monitoring whether the braking air pressure is lower than a first air pressure threshold value in real time, and if not, enabling the braking air cylinder.
  5. 5. The trailer mode control method as recited in claim 1, wherein said obtaining fault status information of the vehicle, determining whether the vehicle enters a normal mode or a fault mode based on the fault status information comprises: acquiring fault code information of the monitoring BMS, the air pump controller, the oil pump controller and the all-in-one controller in real time; If no fault code information exists, judging to enter a normal mode; If the fault code information is judged to be serious, a fault mode is entered, and a brake cylinder is started at the same time.
  6. 6. The trailer mode control method of claim 1, wherein monitoring the turn signal condition in real time, and if the turn condition is satisfied, controlling the oil pump to maintain the first rotational speed operation comprises: monitoring steering wheel angle signals, steering lamp signals, gear signals and hand brake signals in real time; If the steering wheel angle signal and/or the steering lamp signal are/is triggered and the gear signal and the hand brake signal are not triggered, judging that the steering state is met, and controlling the oil pump to maintain the first rotating speed.
  7. 7. The method for controlling a trailer mode according to claim 1, wherein the real-time monitoring of the failure state of the whole vehicle, judging whether to enter a disabled trailer mode according to the failure state, and if yes, sending out the alarm information comprises: dividing the whole vehicle fault into at least two grades; when the primary fault is detected, judging that the vehicle enters a mode of prohibiting the trailer, and simultaneously sending primary alarm information; when the secondary fault is detected, the vehicle is judged to enter a mode of prohibiting the trailer, and secondary alarm information is sent out.
  8. 8. A trailer mode control system for an electric vehicle, comprising: the first judging module is used for acquiring fault state information of the vehicle and judging whether the vehicle enters a normal mode or a fault mode according to the fault state information; The second judging module is used for judging whether the vehicle enters a trailer mode and a trailer prohibition mode from a normal mode and a failure mode respectively according to the user input information confirmation and the vehicle state information confirmation; The first real-time monitoring module is used for monitoring the steering signal state in real time, and controlling the oil pump to maintain a first rotating speed to operate if the steering state is met; the second real-time monitoring module is used for monitoring the fault state of the whole vehicle in real time, judging whether to enter a mode of prohibiting the trailer according to the fault state, and if yes, sending out alarm information.
  9. 9. A vehicle comprising the trailer mode control system of claim 8.

Description

Trailer mode control method and system of electric automobile and vehicle Technical Field The invention belongs to the technical field of automobiles, and particularly relates to a trailer mode control method and system of an electric automobile and the automobile. Background With the continuous increase of the storage capacity of electric vehicles, the demand for road rescue caused by the power shortage of low-voltage storage batteries, the failure of high-voltage systems or the failure of driving motors is increasing. The traditional trailer mode comprises lifting front wheels or using a flat car, the trailer mode cannot be realized for a car body with larger carrying capacity, the trailer can only be carried out through traction, in the trailer mode, the existing research on the electric car trailer mode is concentrated on power assembly protection, motor enabling, speed control and the like, the actual control requirements in the trailer process are not considered, meanwhile, the mode of entering the trailer mode is basically realized by arranging special physical keys on an instrument panel, the probability of occurrence of a fault trailer scene in a daily car is considered to be lower, and the special physical keys of the trailer are arranged, so that the hardware cost is increased synchronously. Therefore, how to realize the activation and the exit of the trailer mode and to cooperatively control the trailer in the process of the trailer without additional hardware investment, and to ensure the operation stability of the vehicle in the passive towing state, has become a key technical problem to be solved in the field of electric automobile fault rescue. Disclosure of Invention Aiming at the defects of the prior art, a trailer mode control method and system of an electric automobile and the automobile are provided, and the method and system are used for solving the problem of real-time monitoring missing after entering a trailer mode. In a first aspect, the present invention provides a method for controlling a trailer mode of an electric vehicle, comprising the steps of: Acquiring fault state information of the vehicle, and judging whether the vehicle enters a normal mode or a fault mode according to the fault state information; Judging whether the vehicle enters a trailer mode and a disabled trailer mode from a normal mode and a fault mode respectively by combining user input information confirmation or vehicle state information confirmation; After entering a trailer mode, monitoring a steering signal state in real time, and if the steering state is met, controlling an oil pump to maintain a first rotating speed to operate; When the vehicle is in the trailer mode, the fault state of the whole vehicle is monitored in real time, whether the vehicle enters the trailer prohibition mode is judged according to the fault state, and if yes, alarm information is sent out. Compared with the prior art, the technical scheme has the following beneficial effects: The vehicle is divided into a normal mode and a fault mode by combining the fault state of the vehicle before entering the trailer mode, whether the vehicle can enter the trailer mode or not is judged through preliminary judgment, then the vehicle can enter the trailer mode through user input information, the condition can be met through vehicle state information monitoring, false triggering can be avoided through a mode of user input information, after the vehicle enters the trailer mode, the steering is monitored in real time, the steering is conveniently enabled, transverse auxiliary power control can be achieved when longitudinal driving force is not available, the fault state is monitored in real time after the vehicle enters the trailer mode, and reminding is carried out, so that accidents in the trailer process are avoided. Based on the technical scheme, the embodiment of the application can be further improved as follows: in one embodiment, the user input information confirmation includes the steps of: Monitoring a first switch starting state and a second switch starting state in sequence; If the first switch and the second switch are started, the whole vehicle feeds back a first-stage signal and broadcasts preset voice content; And starting a third switch within the first time threshold to finish confirmation of the user input information. In an embodiment, the sequentially monitoring the first switch activation state and the second switch activation state includes: Monitoring whether the first switch starting switch is larger than a first opening threshold value, and keeping the opening fall-back of the first switch not to exceed a second opening threshold value and the duration to exceed a second time threshold value; And monitoring that the opening and closing times of the second switch reach the first quantity threshold value in the third time threshold value, and meanwhile, the opening and closing interval of the second switch is larger than