Battery powered industrial vehicles

Abstract

A battery-type industrial vehicle capable of allowing operators to more reliably recognize that the battery will be in an over-discharged state (or cut-off state) soon if the operation continues in this state before the battery is in an over-discharged state (or cut-off state). Set a first voltage range higher than the voltage at the time of overdischarge, a further higher second voltage range, and a further higher third voltage range, and in the case of continuous driving mode, when the battery voltage is in the third voltage range, The calculated target rotational speed is updated to be lower than the upper limit rotational speed set according to the battery voltage and the drive motor is driven; when the battery voltage is in the second voltage range, the calculated target rotational speed is updated to be lower than the minimum upper limit rotational speed and the drive motor In the driving operation, when the battery voltage is within the first voltage range, the drive motor is not driven regardless of the calculated target rotational speed, but the drive motor is regeneratively operated to stop the battery-type industrial vehicle.

Description

technical field [0001] The present invention relates to a battery-type industrial vehicle including a battery device and a drive motor as a driving power source. Background technique [0002] In recent years, battery-type industrial vehicles such as electric forklifts have been used to transport goods in indoor warehouses and the like that strictly control the exhaust gas of internal combustion engines. As an example of the battery-type industrial vehicle of the present invention, for figure 1 A reach truck 10 is shown for illustration. The reach-type forklift 10 is a stand-on forklift in which a battery device and a drive motor are used as driving power sources, and the operator drives while standing. In addition, in figure 1 , the X-axis, Y-axis, and Z-axis are perpendicular to each other, the Z-axis direction shows the vertical upward direction, the X-axis direction shows the forward direction, and the Y-axis direction shows the left direction. [0003] Such as figur...

AI Technical Summary

Problems solved by technology

If the operator continues to drive the reach-type forklift without noticing the over-discharge state of the battery, the voltage of the battery will further drop, and soon it will be impossible to maintain the voltage at which the battery device functions as a power source, so the reach-type forklift cannot perform power-based operation at this time. source driver

The above state is not recommended from the point of view of work efficiency

In addition, if the battery becomes over-discharged, it will affect the life of the battery, so it is not recommended to

In addition, when an abnormality occurs in the battery device, for example, when the temperature of the battery device rises above a predetermined temperature, the input and output of the battery may be cut off. source driver

[0011] In addition, even before the battery is in an overdischarged state (or disconnected state), it may be displayed on a display device (display panel, etc. installed near the accelerator lever, etc.) that there is a battery that has been in an overdischarged state (or disconnected state) recently. Possibility and report to the operator, the operator who was absorbed in the job did not notice the report

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