Electro-hydraulic composite driving system and driving method

Abstract

The invention discloses an electro-hydraulic composite driving system which comprises a power battery, an electric driving unit and a hydraulic driving unit, the electric driving unit comprises a first motor, and the hydraulic driving unit comprises a second motor, a flywheel, a clutch, an energy distribution device and a hydraulic pump/motor. The invention further provides an electro-hydraulic composite driving method, the working state of the clutch is determined according to the running state of the vehicle, and when the clutch is separated, the second motor can drive the flywheel to rotate and store energy; when the clutch is closed, the flywheel rotates and can drive the hydraulic pump/motor to move through the energy distribution device, and the hydraulic pump/motor drives the driving wheel to rotate; and when the vehicle is braked, the power battery does not supply power, the rotating speed of the flywheel is increased, braking energy is recycled, and the second motor outputs negative torque which acts on the driving wheel after being coupled with torque output by the first motor. Meanwhile, a small part of braking energy can be converted into electric energy to be stored in a power battery, and most of the electric energy is directly stored in a flywheel in a mechanical energy form.

Description

technical field [0001] The invention relates to the technical field of electric vehicles and their peripheral supporting facilities, in particular to an electro-hydraulic composite drive system and a drive method. Background technique [0002] In recent years, the world is facing an energy crisis, especially the energy shortage and atmospheric environmental pollution caused by traditional vehicles powered by petroleum energy. Therefore, it has gradually become a trend to vigorously develop new energy vehicles that are energy-saving and environmentally friendly, and pure electric vehicles have become the mainstream of research. [0003] During the driving process of the car, at high speed, the hydraulic braking energy recovery system can provide high resistance torque, good braking effect and high energy recovery efficiency; at low speed, the braking torque provided by the hydraulic braking energy recovery system is unstable , the energy recovery efficiency is low. [0004]...

AI Technical Summary

Problems solved by technology

However, the existing braking energy recovery scheme usually directly charges the battery. Because the braking process is usually short, it is difficult to charge the battery with high power in a short period of time. Secondly, the efficiency of the braking energy feedback process is low, because the kinetic energy is converted into electrical energy through the generator. , and then converted into chemical energy through the battery, and then converted from chemical energy into electrical energy and kinetic energy when reused, such repeated conversions lead to low energy utilization of the vehicle

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