Two-gear pure electric speed change system, pure electric engineering vehicle and control method thereof

Abstract

The invention relates to the field of vehicles, and particularly discloses a two-gear pure electric speed change system, a pure electric engineering vehicle and a control method thereof. The two-gearpure electric speed change system can realize power output adjustment and change under different driving conditions. In the case of large loads, a brake is separated from a gear ring and is combined with a clutch, first-gear operation is carried out, and high torque output is achieved; in the case of light loads, the brake is combined with the gear ring and separated from the clutch, second-gear operation is carried out, and therefore the rotating speed is increased; and in the gear shifting process, since the clutch and the brake have a combined state all the time, no power interruption can be achieved in the gear shifting process. The pure electric engineering vehicle comprises the above-mentioned two-gear pure electric speed change system, gear shifting can be carried out according to the optimal power of the pure electric engineering vehicle, a motor runs in a high-efficiency rotating speed zone as much as possible, the loss is reduced, and the efficiency of mechanical work is improved.

Description

technical field

[0001] The invention relates to the field of vehicles, in particular to a two-speed pure electric transmission system, a pure electric engineering vehicle and a control method thereof. Background technique

[0002] Existing loaders all use traditional engine power output, specifically, the engine flywheel outputs power to the torque converter and then from the super clutch to the direct gear, and then from the direct gear to the output shaft, drive shaft, compression bag, and half shaft to finally output power to the wheel side. With the development of battery energy storage materials, the development and construction of charging infrastructure and the breakthrough of electronic control technology, the application of pure electric drive on construction machinery has been met. Due to the narrow reasonable speed range of the engine (generally 1000-4000rpm), the torque cannot be output when the speed is too low, and the engine will be in an inefficient working ...

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