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Method of braking an electrically driven vehicle

a technology of electrical drive and brake, which is applied in the direction of electric vehicles, braking systems, propulsion by batteries/cells, etc., can solve the problems of wheel lock, wheel lock risk, wheel wear and tear, etc., and achieve the effect of minimizing the risk of wheel lock

Inactive Publication Date: 2001-06-14
BT INDS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] The object of the invention is to provide a method to brake an industrial truck where the brake distance is relatively independent of the load of the truck, where maximum brake torque can be limited in order to prevent overloading of tie gearbox, and where the risk of wheel locking is minimized.

Problems solved by technology

These solutions leads to a variation of the brake distance, depending on how heavily loaded the truck is since a heavier load requires greater breaking torque to retain a given break distance.
Further there is the risk that such a high braking torque is applied that the wheels lock which in addition to longer braking distance also leads to increased wear on wheel as well as gearbox.
The wheel also risk becoming locked where the friction is insufficient, e.g. at an oil spot, where it thus will be locked when sufficient friction again exists which can give the mentioned damages.
Furthermore this can lead to technical control problems since the control system can get the impression of the truck standing still when the wheel no longer rotates and therefore interrupts the braking which then can lead to serious accidents.

Method used

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  • Method of braking an electrically driven vehicle

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Embodiment Construction

[0023] The industrial truck 1 shown in FIG. I is preferably used indoors and includes as essential parts a chassis 2 to which a mast assembly 4 for the handling of goods is arranged. The truck is driven via an asynchronous motor 6 transferring power to a driving wheel 10 via a gearbox 8. The truck is further provided with support wheels 12 in the front end of the support arms 13. The support wheels 12 and the drive wheel 10 can be braked with electromagnetic brakes (not shown in FIG. 1).

[0024] The truck is maneuvered in the usual way with among other things an accelerator 14 and a break pedal 16 whose starting position is define as fully released position. Further there is a travel direction switch 18 and a steering wheel 20. The components for goods handling are maneuvered in some known manner that does not influence the invention and are therefor not described here.

[0025] At use the driver gives signals to the truck regarding desired travel speed in the usual way by means of the a...

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PUM

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Abstract

Method of braking a vehicle driven by an electric motor, in particular industrial truck, where the rotational speed of the motor is reduced according to a predetermined deceleration characteristic (a-d) when braking is activated. Preferably the deceleration characteristic is chosen in dependency of the length of depression of a brake pedal.

Description

[0001] This invention concerns a method of braking a vehicle driven by an electric motor in accordance with the preamble of claim 1.STATE OF THE ART[0002] The industrial trucks of today that are used indoors are usually provided with an electric motor in the form of a DC-motor driving a drive wheel via a gearbox. The truck is further provided with a number of pivot wheels and / or support wheels.[0003] The truck is among other things maneuvered by means of a throttle pedal or accelerator that dependent on its position sends signals to an electronic control unit that furthers signals to the control unit of the motor regarding suitable rotational speed for the driving of the truck with the chosen travel speed.[0004] The truck is further maneuvered with a brake pedal that influence hydraulically controlled mechanical brakes that can influence support wheels as well as drive wheel with suitable torque in dependency of the position of the brake pedal.[0005] The truck can also be braked by ...

Claims

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Application Information

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IPC IPC(8): B60L7/26B60L11/18
CPCB60L7/26B60L11/1803Y02T10/646Y02T10/7005Y02T10/7258Y02T10/648B60L50/51Y02T10/70Y02T10/72Y02T10/64
Inventor VIKMAN, LEIFVALFRIDSSON, GORAN
Owner BT INDS