Braking control system for an electric vehicle
First Claim
1. A regenerative braking control system for an electric vehicle having an electric motor with coils and a battery, said control system comprising:
- braking period setting means for setting a braking period, said braking period starting and ending within a half of a period of an AC voltage generated in said coils of the electric motor when a speed of said electric vehicle is decreasing;
regenerative means for directing an induced current corresponding to energy accumulated in the coils at the end of said braking period to the battery; and
braking means for braking the electric vehicle by consuming energy generated during said braking period.
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Accused Products
Abstract
A regenerative braking control system consumes energy generated in a period corresponding to an angle θ1 which starts in a half of a period of an AC voltage produced in a drive motor during the braking of the drive motor. The regenerative braking control system also consumes energy generated in a period corresponding to an angle θ2 that ends at the end of a half of a period of the AC voltage. The regenerative rate of braking control system utilizes a current induced in the driving coils of the drive motor at the end of the period corresponding to the angle θ1 to recharge a battery. By utilizing two periods to carry out the regenerative braking process, the recharging energy and the braking force can be controlled individually. Moreover, a controller monitors the electric control system to determine whether a malfunction is present. If a malfunction is detected, an electrical brake electrically brakes the drive motor. This electrical braking after the detection of a malfunction in the electrical system provides satisfactory controllability of the electric vehicle.
31 Citations
35 Claims
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1. A regenerative braking control system for an electric vehicle having an electric motor with coils and a battery, said control system comprising:
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braking period setting means for setting a braking period, said braking period starting and ending within a half of a period of an AC voltage generated in said coils of the electric motor when a speed of said electric vehicle is decreasing; regenerative means for directing an induced current corresponding to energy accumulated in the coils at the end of said braking period to the battery; and braking means for braking the electric vehicle by consuming energy generated during said braking period. - View Dependent Claims (2, 3, 4, 5, 6, 19)
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7. (Amended) A regenerative braking control system for an electric vehicle having an electric motor with coils and a battery, said control system comprising:
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first braking period setting means for setting a first braking period during an initial half of a half period of an AC voltage generated in the coils of the electric motor when a speed of said electric vehciel is decreasing; second braking period setting means for setting a second braking period during a latter half of said half period of the AC voltage generated in the coils of the electric motor; regenerative means for directing an induced current corresponding to energy accumulated at an end of said first braking period to the battery; and braking means for braking the electric vehicle by consuming energy generated in said first braking period and energy generated in said second braking period. - View Dependent Claims (8, 9, 10, 11, 13, 14, 15, 17, 18, 20, 21)
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12. A braking control system for an electric vehicle having an electric motor with coils and a battery, said control system comprising:
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braking period setting means for setting a braking period, said braking period starting from a predetermined voltage during a half of a period of an AC voltage produced in the coils and ending at a zero voltage of the AC voltage generated in the coils of the electric motor; and braking means for braking the electric vehicle by consuming energy generated in said braking period. - View Dependent Claims (16)
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22. A method for controlling a braking system for an electric vehicle having an electric motor with coils and a battery, said method comprising the steps of:
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(a) setting a braking period which starts and ends within a half of a period of an AC voltage produced in the coils of the electric motor; (b) recharging the battery using an induced current corresponding to energy stored in the coils at the end of said braking period established in step (a); and (c) braking the electric vehicle by consuming energy generated during said braking period. - View Dependent Claims (23, 24, 25, 26)
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27. A method for controlling a regenerative braking system for an electric vehicle having an electric motor with coils and a battery, said method comprising the steps of:
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(a) setting a first braking period which starts within a half of a period of an AC voltage produced in the coils of the electric motor; (b) setting a second braking period which ends within said half of a period of the AC voltage produced in the coils of the electric motor; (c) recharging the battery using an induced current corresponding to energy stored in the coils at an end of the first braking period; and (d) braking said electric vehicle by consuming energy generated during the second braking period. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35)
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Specification