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Electric drive vehicle

An electric drive and vehicle technology, applied in the field of electric drive vehicles, can solve the problems of unstable behavior, difficulty in stable driving, inconvenient steering operation, etc., and achieve the effect of shortening braking distance and suppressing vibration

Active Publication Date: 2013-04-24
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such a slip occurs, the behavior of the vehicle body is unstable. In addition, the steering operation is not flexible, and it is difficult to drive stably.

Method used

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Examples

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Embodiment Construction

[0026] Embodiments of the present invention will be described below using the drawings.

[0027] figure 1 It is an overall view of the electric drive vehicle according to the first embodiment of the present invention. The electric drive vehicle shown in this figure includes: driving wheel 3 and driving wheel 6; driven wheel 7 and driven wheel 8; motor 1 driving driving wheel 3 by means of gear 2; motor 4 driving driving wheel 6 by means of gear 5; control motor 1 and a motor controller (motor control mechanism) 33 of the motor 4; a slip detector 18 which calculates the slip rates of the drive wheel 3 and the drive wheel 6 to determine whether slip occurs.

[0028] Motor controller 33 includes torque command calculator 17 , torque controller 16 and power converter 13 . The motors 1, 4 are controlled by a motor controller 33, and by driving the drive wheels 3, 6 by the motors 1, 4 via gears 2, 5, the vehicle moves forward or backward.

[0029] also, figure 1 The electric dri...

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Abstract

The present invention is provided with electric motors (1 and 4) for driving or braking drive wheels (3 and 6), wheel speed detectors (9 to 12) for detecting the wheel speed of the drive wheels and the driven wheels (7 and 8) in an electric drive vehicle provided with an electric motor controller (33) for controlling the electric motors, computing means (22 to 28, 35 to 38) for computing the slip ratio of the drive wheels on the basis of the wheel speeds of the drive wheels and the driven wheels, and a determiner (29) for determining that drive wheels are slipping if the slip ratio exceeds a slip ratio assessment value. At the determiner (29), when the wheel speed of the driven wheels is lower than a set speed (Va2 or Vb2), the slip ratio determination value is modified to the value having the same sign as, and a greater absolute value than, the value (?a2 or ?b2) used when the wheel speed of the driven wheels is greater than the set speed (Va2 or Vb2). As a result, the acceleration time when the vehicle is accelerating and the braking distance when the vehicle is decelerating are shortened and vibration of the electric drive vehicle is suppressed.

Description

technical field [0001] The present invention relates to an electrically driven vehicle that travels by driving drive wheels with an electric motor. Background technique [0002] For vehicles running on slippery roads such as frozen roads and snow-covered roads, when the driver tries to step on the accelerator to accelerate the vehicle, the rotation speed of the driving wheels will increase sharply, and sometimes the driving wheels will spin. Also, conversely, when the driver decelerates the vehicle by stepping on the brakes, the rotation speed of the driving wheels suddenly decreases, and the phenomenon of locking of the driving wheels may occur (hereinafter, these phenomena are collectively referred to as slip). When such a slip occurs, the behavior of the vehicle body is unstable, and the steering operation is also inconvenient, making it difficult to drive stably. Therefore, it is important to reliably suppress the occurrence of such slippage. [0003] As a conventional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K7/00B60K28/16B60L15/20B60T8/1761
CPCY02T10/646B60K2007/0061B60W2520/28B60T2201/04Y02T10/648B60T8/17616B60L15/20B60K28/16B60W2520/263G06F17/00B60K7/0007Y02T10/64Y02T10/72
Inventor 小林启之菊池辉安田知彦佐藤隆之中岛吉男
Owner NIHON KENKI CO LTD
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