Method and apparatus for braking and stopping vehicles having an electric drive
First Claim
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1. A method of braking and stopping a vehicle having at least one traction wheel driven by an electric motor, comprising the steps of:
- sensing a speed parameter related to the speed of the vehicle;
sensing a commanded braking rate;
generating a motor control signal to achieve a desired braking action;
producing a negative torque using the electric motor;
applying a braking force to the traction wheel using the negative torque produced by the electric motor; and
, controlling the amount of negative torque produced by the electric motor using the motor control signal to achieve the commanded braking rate.
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Abstract
A method and apparatus are provided for braking and stopping a vehicle whose powertrain includes an electric drive. The electric drive is used to generate braking torque which is used to decelerate the vehicle down to a full stop. The braking torque is achieved using any of several closed loop speed control systems. The system can be used as a substitute for or as a supplement to conventional friction bakes.
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Citations
27 Claims
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1. A method of braking and stopping a vehicle having at least one traction wheel driven by an electric motor, comprising the steps of:
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sensing a speed parameter related to the speed of the vehicle;
sensing a commanded braking rate;
generating a motor control signal to achieve a desired braking action;
producing a negative torque using the electric motor;
applying a braking force to the traction wheel using the negative torque produced by the electric motor; and
,controlling the amount of negative torque produced by the electric motor using the motor control signal to achieve the commanded braking rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of braking and stopping a vehicle powered by an electric motor driving at least one traction wheel, comprising the steps of:
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sensing a speed parameter related to the speed of the vehicle;
sensing a commanded braking rate;
generating a commanded motor speed signal;
generating a torque limiting signal using the commanded braking rate;
generating a torque command signal using the commanded motor speed signal and torque limiting signal;
controlling the motor using the torque command signal to produce negative torque; and
,applying a braking force to the traction wheel using the negative torque. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A system for braking and stopping a vehicle powered by an electric motor driving at least one traction wheel, comprising:
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a torque command signal generator for generating a torque command signal used to drive the motor and produce negative torque for braking the traction wheel; and
,a torque limiting signal generator for converting brake pedal and accelerator pedal position values into torque limiting signals used to modify the torque command signal. - View Dependent Claims (25, 26, 27)
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Specification