Overspeed control method and system for electric automobile
A technology for overspeed control and electric vehicles, applied in electric vehicles, control drives, power management, etc., can solve problems affecting driving safety, etc., and achieve the effect of ensuring effective driving, smooth transition, and improving safety
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Embodiment 1
[0050] This embodiment provides an overspeed control method for an electric vehicle, such as figure 2 shown, including the following steps:
[0051]1. First, compare the current vehicle speed with the target limited vehicle speed, and calculate the first torque limiting coefficient. The process is specifically:
[0052] When the current vehicle speed is lower than the target limited vehicle speed, the first torque limiting coefficient is 1. The target limited vehicle speed is the limited vehicle speed of the vehicle. Since the vehicle speed has not exceeded the target limited vehicle speed, there is no need to perform torque limitation. Therefore, the value of the first torque limited coefficient obtained according to the vehicle speed is 1.
[0053] When the current vehicle speed is greater than the target limited vehicle speed, calculate the difference between the current vehicle speed and the target limited vehicle speed, perform PID adjustment, and output the first torq...
Embodiment 2
[0065] An overspeed control method of an electric vehicle is provided, and the control method involves two controllers: a vehicle controller, which manages the overall state of the vehicle; and a motor controller, which controls the operation of the motor.
[0066] The vehicle controller includes an input module, which receives signals from other controllers and peripheral devices, gear signals, accelerator pedal signals, motor speed signals, etc.; a speed limit coefficient module, which calculates the coefficient of speed limit; an output module, which converts the required torque signal sent to the motor controller, such as image 3 shown.
[0067] Among them, the input module is mainly to receive signals sent by other controllers and peripheral components to the vehicle controller. The gear shifter sends the current gear status of the vehicle to the vehicle controller through a hard wire. The gear shifter has three states: D (forward gear), N (neutral gear), and R (reverse...
Embodiment 3
[0077] Provide a kind of overspeed control system of electric vehicle in the present embodiment, such as Figure 6 shown, including:
[0078] The first torque limiting coefficient calculation unit: compare the current vehicle speed with the target limited vehicle speed, and calculate the first torque limiting coefficient;
[0079] The second torque limit coefficient calculation unit: compare the current motor speed with the target limit speed, and calculate the second torque limit coefficient;
[0080] Taking a small unit: taking the first torque limiting coefficient and the second torque limiting coefficient to be smaller to obtain a torque limiting coefficient;
[0081] Output unit: multiply the maximum torque of the motor by the torque limit coefficient to obtain the output motor torque limit value.
[0082] In this embodiment, the first torque limiting coefficient calculation unit includes:
[0083] The first comparison subunit of vehicle speed: when the current vehicle...
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