Method for achieving slope sliding prevention control of new energy electric vehicle

An electric vehicle, protection and control technology, applied in electric vehicles, control drives, control devices, etc., can solve the problems of increasing hardware equipment, increasing the distance of slopes, and increasing hardware costs, so as to ensure driving safety and reduce slopes. effect of distance

CN111674268AActive Publication Date: 2020-09-18DONGFENG ELECTRONICS TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-09-18

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Abstract

The invention relates to a method for achieving slope sliding prevention control over a new energy electric automobile. The method comprises the steps: acquiring whole automobile state information bya whole automobile controller; determining whether the gear information of the whole vehicle is a forward gear or not; determining whether the rotating speed is negative and greater than a threshold;triggering a generator controller to enter a current loop fixed rotor position angle locked-rotor anti-slip strategy; waiting for 1 second, determining whether the absolute value of the rotating speedis greater than a threshold value or not, and if so, entering a rotating speed ring locked-rotor anti-slip strategy with a rotating speed instruction of zero; otherwise, continuing to determine whether the condition of exiting the slope sliding mode is reached; waiting for 1 second, and determining whether the condition of exiting the slope sliding mode is reached and determining whether the gearis a reverse gear; determining whether the rotating speed is positive and greater than a threshold value. By means of the method for realizing slope sliding prevention protection control of a new energy electric vehicle, on the premise that the hardware cost is not increased, a traditional slope sliding mode control strategy is changed, the advantages of rotation speed ring stalling and current ring fixed rotor position angle stalling are combined, the slope sliding distance in the slope sliding mode can be reduced to the maximum degree, and the driving safety of the whole vehicle is guaranteed.
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Description

technical field

[0001] The invention relates to the field of new energy electric vehicles, in particular to the field of anti-slope protection control, and specifically refers to a method for realizing anti-slope protection and control of new energy electric vehicles. Background technique

[0002] When the electric vehicle is started on a slope, the driver needs to switch between the accelerator pedal and the brake pedal. Due to the different habits of the driver, improper operation may cause the phenomenon of sliding backwards, which will affect driving safety.

[0003] Traditional slope protection control strategies include: adding an inclination sensor, speed ring blocking method:

[0004] Adding an inclination sensor to achieve slope protection is to achieve slope control by obtaining the current vehicle elevation information, vehicle gear information, accelerator pedal information, and brake pedal information. In neutral, when the accelerator pedal signal is lower than...

Examples

specific Embodiment

[0062] Take a permanent magnet synchronous motor with a peak speed of 8000rpm, a peak torque of 200Nm, and a current amplitude of 500A under the output peak torque as an example. If the phase current output is 150A, the maximum output torque is 70N.

[0063] First, judge whether it is necessary to enter the downhill mode according to the gear information and speed information. If the current gear is forward and the motor speed is -15rpm, the downhill mode will be triggered at this moment.

[0064] After entering the slope slope mode, the current rotor position angle is 20 degrees, then first enter the current loop fixed rotor position angle stall strategy, given the d-axis output current of 150A, and the given rotor position angle of 30 degrees, at this time the motor outputs a fixed vector current , and suck the rotor, and check the rotor speed after 1 second. If the rotor speed is -2rpm after 1 second, it is considered that the stall is successful, and the vcu sends the outpu...