An energy storage and drive device applicable to hybrid electric vehicles

Abstract

The invention relates to an energy storing and driving device allowed to be applied to a hybrid electric vehicle. The energy storing and driving device comprises an engine, a first clutch, a first motor / generator, a power distribution mechanism, a flywheel module, a second clutch and a power output device, wherein the power distribution mechanism is a double-row planetary gear transmission device; the flywheel module comprises a flywheel speed increasing driving gear, at least one flywheel speed increasing driven gear meshed with the flywheel speed increasing driving gear, at least one flywheel, at least one flywheel shaft and at least one flywheel brake; the power output device comprises a speed reducing driving gear, a speed reducing driven gear, a speed changing device and a power output shaft. The problems that brake energy is low in recovery efficiency and the acceleration performance is poor are solved. The energy storing and driving device has the advantages of high recovery efficiency of the brake energy, excellent acceleration performance, low cost of the finished vehicle and remarkable energy-saving effect.

Description

Technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to an energy storage and driving device applicable to hybrid electric vehicles. Background technique [0002] Mankind is faced with the two major challenges of the gradual exhaustion of fossil energy and the deterioration of the environment caused by excessive dependence on fossil energy. The rapid development of traditional vehicles powered by petroleum energy is causing humans to fall into a dual crisis of resources and the environment. Therefore, the development of energy-saving and environmentally friendly new energy sources Automobiles have gradually become the development trend of the industry. [0003] A hybrid electric vehicle (HEV) is a vehicle driven by an engine and a motor system. It is in line with the mainstream development direction of environmental protection and high efficiency. According to the number of power sources and the power transmission method, it...

AI Technical Summary

Problems solved by technology

[0006] However, the current braking energy feedback technology has many shortcomings, because the amount of feedback energy is limited by the vehicle's driving conditions and the state of the motor and battery

First of all, the existing braking energy feedback scheme usually requires charging the battery directly, but because the braking process time is mostly short, and there is a limitation that the battery charging rate cannot be too high, it is difficult for the battery to achieve short-term high-power charging; second , the performance requirements of the motor feedback braking energy are too high, and it is difficult to achieve arbitrary adjustment of the braking torque, which does not conform to people's operating habits for traditional brakes; third, although the super capacitor has high specific power, large specific energy, and It has many advantages such as energy storage, which can smooth the charging and discharging current of the power battery, but it is expensive and not easy to popularize; fourth, the operating conditions of electric vehicles require that the motor and transmission system have four-quadrant control functions such as forward and reverse and electric braking. However, the existing electric braking methods and devices can only recover a small amount of energy at medium and high speeds, and the energy recovery rate is almost zero at low speeds; finally, the efficiency of the recycling process of braking energy feedback is not high, because the recovered kinetic energy passes through the The generator is converted into electrical energy, then converted into chemical energy, and then converted from chemical energy into electrical energy and kinetic energy when it is reused. Considerable losses will occur in the two energy conversion processes, which leads to insufficient energy saving effect of the whole vehicle

[0007] In addition, due to the limitations of the space in the front cabin of the car and the center distance between the drive motor and the differential, the diameter of the electric vehicle motor should not be too large, and the cost of the power device of the motor controller is limited. At present, the peak torque of many electric vehicles is too small. There are problems such as poor dynamic performance, poor acceleration performance, and insufficient high-speed overtaking ability

In the Chinese patent CN201120235061.8, a driving device that uses a flywheel to improve the braking energy recovery rate is provided, but there are still problems of poor acceleration performance and insufficient high-speed overtaking ability

In the Chinese patent CN200980142123.6, a flywheel energy storage system is provided, which can quickly meet the energy storage demand in a high-load environment while reducing energy loss, but there are also problems of poor acceleration performance, insufficient high-speed overtaking ability, and high energy saving costs. Problem; Chinese patent CN200980151936.1 provides a flywheel module and a method for storing and transferring energy in the flywheel module, which is simpler and more cost-effective than the flywheel module in the existing drive system, but has poor acceleration performance and high speed The problem of insufficient overtaking ability

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