Controller for electric vehicle
AssigneesHitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.
InventorsRyoso Masaki, Shigeki Morinaga, Kazuo Tahara, Hirohisa Yamamura, Kenzo Kajiwara, Hiroyuki Yamada, Nobuo Inoue, Toshio Suzuki
Life of this patent
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Abstract
The present invention relates to a controller for an electric vehicle in which right and left drive wheels are respectively driven by drive motors which are individually provided. The controller for an electric vehicle comprises motors for driving right and left wheels, means for detecting rotating speeds or rotation torques of the wheels, and a facility for taking a rotation deviation between output signals from the detection means close to zero. As a result, the vehicle is always operated in safety.
Claims15
A controller for an electric vehicle having a right-hand side motor for driving a right-hand wheel, a right-hand side current supply means for supplying driving current to said right-hand side motor, a left-hand side motor for driving a left-hand side wheel, a left-hand side current supply means for supplying driving current to said left-hand side motor, and control means for controlling said right-hand side current supply means and said left-hand side current supply means, wherein said control means comprises:
- means for detecting an abnormality in the operation of said right-hand side current supply means and left-hand side current supply means;
- means for controlling a current supply means, which has been detected to be abnormal, so that driving current is not supplied to said motor driven by the abnormal current supply means, when one of said current supply means is detected as being abnormal;
- switching means for connecting the outputs of said right-hand side current supply means and left-hand side current supply means;
- and
- means for activating said switching means to connect the output of a normal operating current supply means to the motor driven by an abnormally operating current supply means in response to detection of abnormal operation of one of said current supply means by said detecting means.
A controller for an electric vehicle having a right-hand side motor for driving a right-hand wheel of the vehicle, a right-hand side current supply means for supplying driving current to said right-hand side motor, a left-hand side motor for driving a left-hand side wheel of the vehicle, a left-hand side current supply means for supplying driving current to said left-hand side motor, and control means for controlling said right-hand side current supply means and said left-hand side current supply means, wherein said control means comprises:
- means for detecting an abnormality in the operation of said right-hand side current supply means and left-hand side current supply means;
- means for controlling a current supply means, which has been detected to be abnormal, so that driving current is not supplied to the motor driven by the abnormal current supply means, when one of said current supply means is detected as being abnormal;
- means for determining maximum acceleration of the motor or maximum driving force of the wheel, which maximum acceleration and maximum driving force causes a rotational moment which results in a turning of the vehicle around a vertical axis passing through a center of gravity of the vehicle;
- and
- means for controlling a current supply means which is not detected as being abnormal so as to keep the acceleration of the motor or the driving force of the wheel at a value lower than said maximum acceleration or said maximum driving force, when one of said current supply means is detected as being abnormal.
A controller for an electric vehicle having plural motors for driving respective tires of said vehicle independently of one another, plural power conversion means for supplying electric power to said motors, detection means for detecting a state of said vehicle, and control means for calculating a speed control so as to follow speed commands for said motors calculated on the basis of a signal from said detection signal to output voltage commands to said power conversion means, respectively, said controller comprising:
- connection means capable of opening and closing switching means for connecting individual output lines of said power conversion means to one another in response to output signals from said control means,
- wherein when said control means judges that some power conversion means out of said power conversion means perform respective operations different from the output voltage commands therefor, the output lines of the power conversion means of interest are connected to one another using said connection means in such a way that each of the connected motors which have been driven by the power conversion means of interest is driven by said power conversion means other than the power conversion of interest,
- wherein, when said control means judges that one of said power conversion means are out of order, after control is performed in such a way that a difference between a speed of each of said motors driven by said power conversion means, other than the one power conversion means, and a speed of each of the connected motors becomes within a predetermined value, said motors are controlled by said available power conversion means using said switching means.
A controller for an electric vehicle having plural motors for driving respective tires of said vehicle independently of one another, plural power conversion means for supplying electric power to said motors, detection means for detecting a state of said vehicle, and control means for calculating a speed control so as to follow speed commands for said motors calculated on the basis of a signal from said detection signal to output voltage commands to said power conversion means, respectively, said controller comprising:
- connection means capable of opening and closing switching means for connecting individual output lines of said power conversion means to one another in response to output signals from said control means,
- wherein when said control means judges that some power conversion means out of said power conversion means perform respective operations different from the output voltage commands therefor, the output lines of the power conversion means of interest are connected to one another using said connection means in such a way that each of the connected motors which have been driven by the power conversion means of interest is driven by said power conversion means other than the power conversion of interest,
- wherein after the output lines of the power conversion means are connected to one another using said connection means, the maximum velocity at which said vehicle can travel is set to a value less than a rated maximum velocity.
Dependencies are inferred from the claim text.