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Monitoring method and system for running safety of electric vehicle

A safety monitoring system and technology for electric vehicles, applied in electric vehicles, electrical devices, vehicle components, etc., can solve the problems of inability to correct judgment errors, monitoring failure, and low signal accuracy.

Inactive Publication Date: 2015-08-26
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is that the signal for torque comparison in the prior art comes from a single controller, and the signal accuracy is not high when disturbed; at the same time, the monitoring method is single, and it cannot be corrected when the judgment is wrong; In addition, if there is a problem with the communication after the controller calculates, there will be monitoring failure or misjudgment, so a kind of electric vehicle driving with the signals for torque comparison coming from different controllers, using multiple monitoring methods and mutual verification Safety monitoring method and system

Method used

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  • Monitoring method and system for running safety of electric vehicle
  • Monitoring method and system for running safety of electric vehicle

Examples

Experimental program
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Effect test

Embodiment 1

[0119] This embodiment provides a method for monitoring electric vehicle driving safety, the flow chart of which is as follows figure 1 shown, including the following steps:

[0120] (1) Determine the torque demand.

[0121] Torque demand refers to the torque required by the driver in the process of driving the vehicle, which can be obtained according to the driver's operation on the vehicle, such as the opening of the accelerator pedal, whether the brake pedal is depressed, etc. The action of the vehicle can obtain the torque required by the driver, and the torque demand can be obtained by means of the prior art.

[0122] (2) Calculate the power demand required to meet the torque demand. After the driver's torque demand is obtained, the power corresponding to the torque demand can be obtained through formula calculation, and this power is taken as the power demand.

[0123] (3) Obtain the actual torque of the current electric drive system as a torque parameter.

[0124] T...

Embodiment 2

[0134] This embodiment provides another electric vehicle driving safety monitoring method, which is the same as the five steps in embodiment 1, but in this embodiment, an implementation method with better effect is provided for each step.

[0135] (1) Determine the torque demand, the specific process is as follows, see figure 2 Shown:

[0136] S1.1. Calculate the driving demand according to the driver's operation, including:

[0137] Collect one or more signals from accelerator pedal opening, brake pedal depression depth, gear handle position and cruise mode signals; according to the accelerator pedal opening degree, brake pedal depression depth, gear lever position and cruise mode One or more signals among the signals are analyzed to calculate the driver's requirements for the vehicle's speed, acceleration, and direction of travel to obtain the driving requirements.

[0138] S1.2. Determine the driver's final demand according to the driving demand, including: setting the d...

Embodiment 3

[0174] In the above-mentioned first and second embodiments, the fault judgment is carried out according to the conditions of torque and power. In order to strengthen the monitoring of the hardware and software of the electric drive system, this embodiment further includes checking whether the storage area and the program flow appear If there is a problem in the storage area or program of the electric drive system, the fault will also be monitored, so as to achieve the monitoring of the driving safety of the electric vehicle. On the basis of the above power characteristic and torque characteristic monitoring, increase It improves the monitoring of hardware storage and software operation, and further improves the safety performance of the vehicle.

[0175] Specifically, in this embodiment, a method for monitoring the driving safety of electric vehicles is also provided, the essence of which is the same as that of Embodiments 1 and 2, except that in this embodiment, the method is ...

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Abstract

The invention provides a monitoring method for running safety of an electric vehicle. The method comprises steps as follows: firstly, determining the torque requirement, and then calculating the power requirement for meeting the torque requirement; secondarily, calculating and taking one or more kinds of actual torque and / or one or more kinds of nominal torque of a current electric drive system as a torque parameter, and then calculating and taking one or more kinds of actual power of the electric drive system as a power parameter; finally, comparing the torque requirement with the torque parameter and / or comparing the power requirement with the power parameter for failure judgment, so that the running safety of the electric vehicle is monitored. The safety performance of the vehicle is judged by using two characteristics, namely, torque and power, problems that only the torque characteristic is used, the judging method is single and erroneous judgment and missing judgment can be caused easily in the prior art are solved, the vehicle safety is monitored by using the power characteristic and the torque characteristic, multi-aspect redundancy check can be performed by using various signals, the failure detection sensitivity is increased, and the detection credibility is increased through mutual check.

Description

technical field [0001] The invention relates to an electric vehicle safety monitoring method and system. Specifically, it is a driving safety monitoring method and system for an electric vehicle. Background technique [0002] The depletion of global energy sources and the increasingly serious environmental pollution caused by petrochemical energy also restrict the development of society and economy. The realization of green travel and energy saving and environmental protection has become the main direction advocated by the society, which has made substantial progress in the development of electric vehicles. New energy vehicles, especially pure electric vehicles, are strongly supported by the government in our country, and are gradually moving towards private rental and private purchase markets through regional demonstration operations. The safety of electric vehicles has undoubtedly become an important assessment indicator for whether they can be accepted by the market. ...

Claims

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Application Information

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IPC IPC(8): B60L3/00
Inventor 梁汝川
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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