Boots – shoes – and leggings
Patent
1992-06-03
1996-01-02
Teska, Kevin J.
Boots, shoes, and leggings
318139, 318587, B60L 900
Patent
active
054814600
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a controller for an electric vehicle and more particularly to a controller for an electric vehicle suitable for driving a right wheel and a left wheel by individual motors.
BACKGROUND ART
In general, an electric vehicle is designed in such a way that motors are rotated using a battery as a power source to drive the wheels, thereby to make the vehicle travel. Moreover, there is described in JP-A-59-10102 and JP-A-62-138002 a type of electric vehicle in which a left wheel and a right wheel are driven by individual motors.
When the left wheel and the right wheel are driven by individual motors, for example, it is possible to control the motors independently of each other so as to make the speed of the left wheel and that of the right wheel different from each other. Such a control provides for improved steering so that the driveability of the electric vehicle can be improved.
With the technology disclosed in the above-referenced publications, however, there is the possibility in some cases that when an abnormality occurs in the rotation of one motor, the vehicle gets into a state in which it is difficult to control it in accordance with the driver's desires. Especially, this problem becomes critical in the case of high speed driving. In a most serious case, the vehicle spins so that the steering gets uncontrollable.
DISCLOSURE OF THE INVENTION
It is therefore a principal object of the present invention to provide an electric vehicle which is capable of travelling properly even when an abnormality occurs in the rotation of one of a motor for driving a left wheel and a motor for driving a right wheel.
It is another object of the present invention to provide a control system for a vehicle which is capable, when a microprocessor used in a controller of the vehicle gets into a run away state, of preventing a motor which is driven by the microprocessor from being accelerated or decelerated abnormally, thereby to allow the vehicle to be stopped safely.
It is still another object of the present invention to provide an electric vehicle which is capable of travelling at a low speed and in safety when a plurality of microprocessors are normally operated.
The above principal object is attained by an electric vehicle having a motor for driving a first wheel; a second motor for driving a second wheel; first current supply means for supplying a current to the first motor; second current supply means for supplying a current to the second motor; and means for stopping the current supply from the first current supply means to the first motor and supplying a current from the second current supply means to the first motor when the first current supply means is in an abnormal state (the first construction).
Further, the above object is also attained by an electric vehicle having a first motor for driving a first wheel, a second motor for driving a second wheel, first current supply means for supplying a current to the first motor, second current supply means for supplying a current to the second motor, means for calculating a limit current value with which the vehicle gets into a spinning state from a travelling state, and means for performing a control so that the first or second motor will not exceed the limit current value (the second construction).
Furthermore, the above object is also attained by an electric vehicle having a first motor for driving a first wheel, a second motor for driving a second wheel, first current supply means for supplying a current to the first motor, second current supply means for supplying a current to the second motor, abnormality detection means for detecting an abnormality of a rotation state of the first or second motor, and means for limiting the current supplied to the first or second motor so that the velocity of the vehicle will not exceed a predetermined value, on the basis of an output of the abnormality detection means (the third construction).
The above object is attained by a controller for an electric vehicle for driving two or m
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Inoue Nobuo
Kajiwara Kenzo
Masaki Ryoso
Morinaga Shigeki
Suzuki Toshio
Hitachi , Ltd.
Hitachi Automotive Engineering Co. Ltd.
Teska Kevin J.
Walder, Jr. Stephen J.
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