Single-motor electro-hydraulic hybrid drive system

Abstract

The invention provides a single-motor electric-hydraulic hybrid driving system and a control method thereof, and the single-motor electric-hydraulic hybrid driving system comprises a hydraulic oil tank assembly, a hydraulic oil pump, a hydraulic oil pump clutch, an energy accumulator, an overflow valve, a one-way valve, a first motor, a first clutch, a first brake, a planet wheel mechanism, a second brake, a second motor, a second clutch, a gearbox input shaft hydraulic driving gear, a third clutch, a fourth clutch, a gearbox output shaft hydraulic driving gear, a driving control unit, an electromagnetic valve, a driving hydraulic motor, a gearbox output shaft coupling gear, a gearbox and a gearbox input shaft coupling gear. By utilizing the mechanical coupling relation of the planetary gear train and combining the clutchs and the brake, a two-gear speed changing effect can be formed in front of the input shaft of the gearbox, so that the motor torque is reduced, the size of a driving motor is reduced, the load rate is improved, and the efficiency of an electric driving system is improved.

Description

technical field [0001] The invention relates to the hydraulic field of pure electric vehicles, in particular to a single-motor electro-hydraulic hybrid drive system. Background technique [0002] The following problems often occur in electric vehicles under the working conditions of frequent heavy-load starting, heavy-load climbing, frequent heavy-load start-stop, off-road heavy-load low-speed driving in the above working scenarios: 1. The starting power is insufficient. In order to start normally, it is usually equipped with Larger drive motors or gearboxes with more gears; 2. When power is interrupted during heavy-duty climbing and shifting, it is easy to cause the risk of slipping; the demand characteristics for these vehicles or scenarios are: [0003] 1. The speed is not high, and the start and stop are frequent; [0004] 2. Starting with great resistance or starting on a slope requires peak drive torque compensation, and the motor or gearbox cannot be infinitely incre...

AI Technical Summary

Problems solved by technology

[0002] The following problems often occur in electric vehicles under the working conditions of frequent heavy-load starting, heavy-load climbing, frequent heavy-load start-stop, off-road heavy-load low-speed driving in the above working scenarios: 1. The starting power is insufficient. In order to start normally, it is usually equipped with Larger drive motors or gearboxes with more gears; 2. When power is interrupted during heavy-duty climbing and shifting, it is easy to cause the risk of slipping; the demand characteristics for these vehicles or scenarios are:

[0003] 1. The speed is not high, and the start and stop are frequent;

[0004] 2. Starting with great resistance or starting on a slope requires peak drive torque compensation, and the motor or gearbox cannot be infinitely increased;

[0007] 5. Reduce the size of the motor and transmission to increase the load rate and efficiency, but not reduce the drive capacity

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