Electric forklift double built-in spline pump motor control method and control system thereof

Abstract

The invention relates to an electric forklift double built-in spline pump motor control method and a control system thereof. The electric forklift double built-in spline pump motor control method comprises a traction motor controller, a pump motor controller, a brake switch, a relay and a DC-DC power inverter. One end of the brake switch is connected with the power output end of the DC-DC power inverter, the other end of the brake switch is connected with the negative pole wiring end of the pump motor controller through the relay, a direction switch is connected between the digital input end of the traction motor controller and the forward switch signal end and the backward switch signal end of the traction motor controller in series, and the power end of a traction motor is connected withan accelerator. One end of a rotor of a pump motor is connected with a steering oil pump through a spline, and the other end of the rotor of the pump motor is connected with a braking oil pump through a spline. The low-power pump motor provides power, the overall arrangement of the forklift is easier, through matching of an oil pump displacement, the working performance point efficiency of the pump motor is improved, and the energy consumption of the system is reduced.

Description

technical field [0001] The invention relates to the technical field of forklift control, in particular to a motor control method and a control system of a dual built-in spline pump for an electric forklift. Background technique [0002] With the increase of the tonnage of electric forklifts, manual braking and manual steering are no longer suitable for application in the drive system of large-tonnage electric forklifts, which requires the use of electric motors to provide a power source for the dynamic braking system and steering system. In this case, there are usually two solutions. The first solution is that the steering system is driven by a low-power steering motor, and the brake drive is driven by a high-power pump motor that drives the lifting system to drive the oil pump to divert to the brake through the oil circuit. The high-power pump motor drives the small-volume oil pump to run, which makes the efficiency of the motor low, the oil circuit is more complicated, and...

AI Technical Summary

Problems solved by technology

In this case, there are usually two solutions. The first solution is that the steering system is driven by a low-power steering motor, and the brake drive is driven by a high-power pump motor that drives the lifting system to drive the oil pump to shunt the oil to the brake through the oil circuit. The high-power pump motor drives the small-volume oil pump to run, so the efficiency of the motor is low, the oil circuit is more complicated, and the system loss is relatively large

Another solution is that the steering system is driven by a low-power steering motor, and the braking system is driven by another low-power motor to drive the oil pump to fill the brakes. In this case, the motor has high efficiency and low heat loss, but the cost is high. The layout design of the car is also relatively difficult

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