Braking control apparatus for an electric motor operated vehicle
First Claim
1. In an electric motive power system including an electric driving motor supplied with power from a battery through a chopper and drive direction switching means for selectively switching the connection of said battery to said electric driving motor to effect forward and backward operation thereof, a braking control apparatus comprising regeneration switch means for switching connection of said battery to said electric drive motor to effect regenerative braking of said motor, detecting means for sensing a predetermined operating condition of said electric driving motor, and control means responsive to said detecting means for operating said regeneration switch means at the time of operation of said drive direction switching means to effect regenerative braking prior to sensing of said predetermined operating condition by said detecting means and for releasing said regeneration switch means in response to said detecting means to thereafter provide plugging braking.
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Accused Products
Abstract
In cases of subjecting an electric motor operated vehicle to electric braking, regenerative braking is performed during the first stage of the braking operation thereby supplying the armature current to the battery as a load, and a plugging operation is performed during the last stage thereof to complete the braking operation, whereby the efficiency of operation is enhanced by conserving the armature current to extend the traveling distance of the vehicle per charge of the vehicle battery, and the generation of excessive heat in the motor is suppressed.
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Citations
11 Claims
- 1. In an electric motive power system including an electric driving motor supplied with power from a battery through a chopper and drive direction switching means for selectively switching the connection of said battery to said electric driving motor to effect forward and backward operation thereof, a braking control apparatus comprising regeneration switch means for switching connection of said battery to said electric drive motor to effect regenerative braking of said motor, detecting means for sensing a predetermined operating condition of said electric driving motor, and control means responsive to said detecting means for operating said regeneration switch means at the time of operation of said drive direction switching means to effect regenerative braking prior to sensing of said predetermined operating condition by said detecting means and for releasing said regeneration switch means in response to said detecting means to thereafter provide plugging braking.
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10. In a braking control apparatus for an electric vehicle including a d.c. electric motor for driving the vehicle, a battery supplying the d.c. motor with electric power, a chopper for controlling the d.c. motor, drive direction switching means for selectively switching the connection of the battery to the d.c. motor to effect forward and backward operation thereof, and a current detector for detecting an armature current of the d.c. motor, the improvement comprising:
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means for generating a reference of the braking force; regeneration switch means for switching connection of the battery to the d.c motor to effect regenerative braking of the d.c. motor; a chopper control means for controlling a duty factor of the chopper in accordance with the comparison between the braking force reference and the output of the current detector so that the regenerative braking force produced by the d.c. motor is kept at a certain constant value; detecting means for sensing a predetermined operating condition of the d.c. motor, the predetermined operating condition being the operating condition under the minimum rotating speed of the d.c. motor above which the regenerative braking of the certain constant value of braking force is actuated; and control means responsive to the detecting means for operating the regenerative switch means at the time of operation of said drive direction switching means to effect regenerative braking prior to sensing of the predetermined operating condition by the detecting means and for releasing the regeneration switch means in response to the detecting means to thereafter provide plugging braking, wherein the braking force of the regenerative braking and the plugging braking is kept equal to the certain constant value at the time of transfer from the regenerative braking to the plugging braking. - View Dependent Claims (11)
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Specification