An electro-hydraulic composite drive system and drive method

Abstract

The invention discloses an electro-hydraulic composite drive system, comprising a power battery, an electric drive unit and a hydraulic drive unit. The electric drive unit includes a first motor, and the hydraulic drive unit includes a second motor, a flywheel, a clutch, an energy distribution device and a hydraulic pump / motor. The invention also provides an electro-hydraulic compound driving method, which determines the working state of the clutch according to the driving state of the vehicle. When the clutch is disengaged, the second motor can drive the flywheel to rotate and store energy; when the clutch is closed, the flywheel rotates and can utilize the energy distribution. The device drives the hydraulic pump / motor to move, and the hydraulic pump / motor drives the drive wheel to rotate; when the vehicle brakes, the power battery does not supply power, the speed of the flywheel increases, and the braking energy is recovered. The second motor outputs negative torque and outputs the same output as the first motor. The torque is coupled to act on the drive wheels. At the same time, a small part of the braking energy can be converted into electrical energy and stored in the power battery, and most of it is directly stored in the flywheel in the form of mechanical energy.

Description

technical field [0001] The invention relates to the technical field of electric vehicles and their surrounding 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 pollution caused by traditional vehicles powered by petroleum energy are becoming more and more serious. Therefore, vigorously developing energy-saving and environmentally friendly new energy vehicles has gradually become a trend, and pure electric vehicles have become mainstream research. [0003] During the driving process of the car, at high speed, the hydraulic braking energy recovery system can provide higher 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. ...

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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