Whole vehicle control device and control method for electric vehicle

Abstract

The invention provides a whole vehicle control device and control method for an electric vehicle. The control device comprises a whole vehicle control unit, a digital intelligent display screen, a motor control unit, a drive motor, a power battery pack and a battery management unit, wherein the whole vehicle control unit is respectively connected with the digital intelligent display screen, the motor control unit and the battery management unit through communication buses; the drive motor is in two-way connection with the motor control unit respectively through a signal wire harness and a power supply wire harness; the battery management unit is connected with the power battery pack through a detection signal wire harness. The battery management unit comprises a plurality of single power battery protection circuits, a low-electricity-quantity warning signal drive circuit, a discharging protection signal drive circuit and a charging protection signal drive circuit, and the whole vehicle control unit comprises a main control chip, a power input and adjustment port circuit, a separation sensor signal input port circuit, a communication port and a digital intelligent display screen output port circuit. According to the whole vehicle control device and the control method, safety performance is improved, energy is saved and low-carbon performance and environment protection are achieved.

Description

Technical field [0001] The invention involves the field of electric vehicle control, especially an electric vehicle control device and its control method. Background technique [0002] In recent years, urban transportation issues have attracted increasing attention. Although cars, motorcycles, etc. are gradually popularized in the world due to their advantages such as convenience, such as convenient use of urban cars and motorcycles, environmental pollution problems have continued to increase, environmental pollution problemsAnd energy issues are becoming increasingly serious.With the continuous progress of the new high -energy secondary battery technology, especially lithium -ion power battery technology, the technology development and promotion of electric motorcycles, electric bicycles, electric scooters, and electric leisure vehicles has been increasingly valued. [0003] New high -energy secondary batteries such as lithium -ion batteries and nickel -metal hydride batteries h...

AI Technical Summary

Problems solved by technology

However, due to the active characteristics of new high-energy secondary batteries such as lithium batteries and nickel-metal hydride batteries, there are strict requirements on the voltage, current and working environment of charging and discharging. Overcharging or overdischarging will cause permanent damage and even bring safety. Hidden dangers, to ensure that the power battery normally provides driving energy for electric vehicles, it must be equipped with a vehicle control unit to manage and protect its operation

At present, the electric vehicle drive and management unit using lithium-ion power battery as electric energy in the market lacks system design. On the original electric vehicle drive unit using lead-acid battery as electric energy, only a simple protection function is added to manage the driving energy. Both protection and protection are completed with simple protection functions. The MOSFET in the battery protection unit is used as a medium to control the energy transmission from the battery pack to the motor, and at the same time as a battery when the voltage of a single battery in the battery pack is too high or too low. The protection unit controls the MOSFET to turn off the main circuit of the battery pack to protect the safe execution device of the battery pack

There are three main problems with this approach:

[0004] (1) MOSFET is easily damaged due to overheating when working with high current, and cannot work stably and reliably for a long time under high current conditions; When the main circuit is assembled, due to high voltage and large current, large surge impacts are generated, which can easily damage the components directly connected to it and on the electrical path; in order to ensure load balance, the battery protection unit must be equipped with MOSFETs and Equipped with a load balancing control module, the technology is complicated and the cost is high

[0005] (2) Without energy feedback charging protection, it is easy to cause the battery to be overcharged

[0006] (3) Lack of low battery warning function, which may easily cause electric vehicles to break down during driving, affecting driving safety

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