Model based vehicle overspeed algorithm
First Claim
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1. A speed-limited powertrain for a vehicle, comprising:
- a motor that develops torque for propelling the vehicle;
a speed sensor that generates a speed signal based on a speed of the vehicle; and
a control module that (i) generates a first torque signal based on a difference between a predetermined maximum speed of the vehicle and a speed of the vehicle, wherein the predetermined maximum speed of the vehicle is a maximum speed that the vehicle can safely travel, (ii) generates a second torque signal based on the vehicle speed and an aerodynamic drag coefficient of the vehicle, and (iii) generates a torque control signal based on a sum of the first and second torque signals, wherein the torque control signal is adapted to control an output torque of the motor and the output torque of the motor is related to an axle torque by a gear ratio.
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Abstract
A system for limiting the speed of a vehicle includes a first module that generates a first torque signal based on a vehicle speed, a second module that generates a second torque signal based on a difference between a predetermined vehicle speed limit and the vehicle speed, and a third module that generates an output torque signal based on the first and second torque signals. The output torque signal is adapted to control the output torque of a motor.
28 Citations
8 Claims
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1. A speed-limited powertrain for a vehicle, comprising:
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a motor that develops torque for propelling the vehicle; a speed sensor that generates a speed signal based on a speed of the vehicle; and a control module that (i) generates a first torque signal based on a difference between a predetermined maximum speed of the vehicle and a speed of the vehicle, wherein the predetermined maximum speed of the vehicle is a maximum speed that the vehicle can safely travel, (ii) generates a second torque signal based on the vehicle speed and an aerodynamic drag coefficient of the vehicle, and (iii) generates a torque control signal based on a sum of the first and second torque signals, wherein the torque control signal is adapted to control an output torque of the motor and the output torque of the motor is related to an axle torque by a gear ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification