Single-motor electro-hydraulic hybrid drive system

Abstract

The invention provides a single-motor electro-hydraulic hybrid drive system and its control method, comprising: 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, first brake, planetary gear mechanism, second brake, second motor, second clutch, gearbox input shaft hydraulically driven gear, third clutch, fourth clutch, gearbox output shaft hydraulically driven gear, drive control unit, The solenoid valve drives the hydraulic motor, the output shaft of the gearbox is coupled to the gear, and the gearbox is coupled to the input shaft of the gearbox. Utilizing the mechanical coupling relationship of the planetary gear train, combined with the clutch and brake at the same time, a 2-speed shifting effect can be formed before the input shaft of the gearbox, thereby reducing the motor torque, reducing the size of the driving motor, increasing the load rate, and improving the efficiency of the electric drive system. .

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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