Supplementary control system and method based on MCU hill holding and hill starting

Abstract

The invention relates to an assisted control system and method based on MCU hill holding and hill starting. The method comprises the following steps of judging whether a vehicle enters a hill-holding mode or not in real time according to a control signal of the vehicle and a motor speed, wherein VCU vehicle operation mode judgment is not needed; after the vehicle enters the hill-holding mode, under the control of the MCU, switching a torque mode to a speed mode; under the speed mode, controlling the speed given to zero speed by the MCU to realize hill holding; in order to achieve zero speed constancy under the speed mode, adjusting output torque by a drive motor according to different gravity components corresponding to different slope angles; and identifying and controlling the entire hill-holding process completely and independently by the MCU, and high precision of torque control and strong real-time capability are achieved.

Description

Technical field [0001] The present invention relates to the technical field of electric power transmission, in particular to the field of standing and half-slope starting torque control of pure electric vehicles based on a motor controller (MCU) and locked-rotor protection of permanent magnet synchronous motors for electric vehicles. Auxiliary control system and method for MCU standing and half-slope start. Background technique [0002] The parking and half-slope start assist control applied to new energy vehicles is generally realized based on the programming of the vehicle controller (VCU). However, some common low-speed electric vehicles, old-generation electric vehicles and other pure electric vehicles Without the integration of VCU, it is precisely because of the particularity of the drivers of these electric vehicles that the auxiliary control of standing and half-slope start has become an inevitable state of their safety. [0003] Considering that all electric vehicles are ...

AI Technical Summary

Problems solved by technology

At different slope angles, the electric vehicle needs to overcome the gravity component to achieve the effect of standing on the slope. The torque output by the MCU is naturally different. If the MCU is still working under the torque state, then the slope at different slope angles The command torque of the upper MCU cannot be determined

Of course, this situation can also be compensated by torque calibration for different slope angles, but electric vehicles also need to install a device for judging slope angles, which also increases hardware costs, and is also not considered

[0005] In actual driving, different drivers have different operating habits, and there are often differences in the sequence of releasing the handbrake and stepping on the accelerator, so it is easy to cause the car to slip, delay, and state impact when starting on a half-slope

[0006] After the pure electric vehicle enters the parking state, the drive motor maintains a state of zero speed, which is similar to the effect of motor stalling. It is well known that the motor will maintain a large current when it is in the stalling state for a long time. The gravity component also needs to maintain a larger current. The larger the slope angle, the greater the gravity component that needs to be overcome. Naturally, the current given amount that needs to be maintained is also larger, and the motor will heat up in a short time. Similarly, the IGBT or other components in the MCU Power devices will also generate heat, causing huge losses to hardware

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