Electric forklift driving and hydraulic integrated power system and control method thereof

Abstract

The invention discloses an electric forklift driving and hydraulic integrated power system and a control method thereof. The system comprises an electric forklift driving power subsystem, an electricforklift hydraulic power subsystem and an upper power control subsystem; the electric forklift driving power subsystem comprises a driving motor, a driving motor control unit and a high speed ratio reducer; the electric forklift hydraulic power subsystem comprises an oil pump motor, an oil pump motor control unit and an oil pump; the electric forklift upper power control subsystem comprises an upper power system controller; and the driving motor control unit and the oil pump motor control unit are integrated and form a driving motor-oil pump motor two-in-one controller. The electric forklift driving and hydraulic power subsystem is high in integration degree, connection of a three-phase power harness and a low-voltage sampling control harness between an external motor and the motor controller is omitted, and the power transmission loss is greatly reduced; and the driving and hydraulic integrated power system is easier to assemble and mounted with a complete vehicle.

Description

technical field [0001] The invention belongs to the field of electric forklifts, and relates to an integrated power technology of electric forklifts, in particular to an electric forklift driving and hydraulic integrated power system and a control method thereof. Background technique [0002] China's forklift truck market has broad development space, especially the market potential of electric forklift trucks is huge. With the continuous development of the economy, higher requirements are put forward for the electric forklift drive and hydraulic power system. [0003] The existing electric forklift driving and hydraulic power system has a single technical route, basically using the driving motor and the front axle reducer to form the walking power unit, the oil pump motor and the oil pump to form the hydraulic power unit, and the drive motor controller and the oil pump motor controller to form the motor. Control unit; the entire power system adopts a large-scale decentraliz...

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Problems solved by technology

[0003] The existing electric forklift driving and hydraulic power system has a single technical route, basically using the driving motor and the front axle reducer to form the walking power unit, the oil pump motor and the oil pump to form the hydraulic power unit, and the drive motor controller and the oil pump motor controller to form the motor. Control unit; the entire power system adopts a large-scale decentralized arrangement, the walking power unit is arranged at the front axle of the car body, the hydraulic power unit is arranged at the middle or rear of the car body, and the motor control unit is arranged at the middle or rear of the car body; In the system, the walking power unit and the hydraulic power unit are far away from the motor control unit, and the length of the connecting cable is too long, which is not conducive to the assembly of the whole vehicle, and the too long cable will increase the cost and affect the efficiency of electric energy, which will eventually lead to the failure of the whole vehicle. The energy consumption of the vehicle has increased significantly; for the state where the driving and hydraulic power systems are distributed in a large area, the heat dissipation efficiency and functions are not easy to realize, and each unit needs to be cooled or dissipated separately, resulting in a very complicated structure and a substantial increase in cost

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