System and method for controlling a vehicle
First Claim
1. A vehicle control system comprising:
- a controller configured to determine an upper non-zero limit on deceleration of a vehicle, the controller configured to determine the upper non-zero limit to prevent rollback of the vehicle down a grade being traveled up on by the vehicle, the upper non-zero limit on deceleration determined by the controller based on a payload carried by the vehicle, a speed of the vehicle, and a grade of a route being traveled upon by the vehicle,wherein the controller is configured to monitor the deceleration of the vehicle, the controller configured to automatically prevent the deceleration of the vehicle from exceeding the upper non-zero limit by applying a direct current to an alternating current motor of the vehicle, andwherein the controller configured to supply the direct current to the motor of the vehicle to prevent rollback of the vehicle while the vehicle is moving up the grade at a non-zero speed.
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Accused Products
Abstract
A vehicle control system determines an upper non-zero limit on deceleration of a vehicle to prevent rollback of the vehicle down a grade being traveled up on by the vehicle. The upper non-zero limit on deceleration is determined by the controller based on a payload carried by the vehicle, a speed of the vehicle, and a grade of a route being traveled upon by the vehicle. The controller is configured to monitor the deceleration of the vehicle, and to automatically prevent the deceleration of the vehicle from exceeding the upper non-zero limit by controlling one or more of a brake or a motor of the vehicle. The controller also is configured to one or more of actuate the brake or supply current to the motor of the vehicle to prevent rollback of the vehicle while the vehicle is moving up the grade at a non-zero speed.
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Citations
20 Claims
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1. A vehicle control system comprising:
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a controller configured to determine an upper non-zero limit on deceleration of a vehicle, the controller configured to determine the upper non-zero limit to prevent rollback of the vehicle down a grade being traveled up on by the vehicle, the upper non-zero limit on deceleration determined by the controller based on a payload carried by the vehicle, a speed of the vehicle, and a grade of a route being traveled upon by the vehicle, wherein the controller is configured to monitor the deceleration of the vehicle, the controller configured to automatically prevent the deceleration of the vehicle from exceeding the upper non-zero limit by applying a direct current to an alternating current motor of the vehicle, and wherein the controller configured to supply the direct current to the motor of the vehicle to prevent rollback of the vehicle while the vehicle is moving up the grade at a non-zero speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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determining an upper non-zero limit on deceleration of a vehicle to prevent rollback of the vehicle down a grade being traveled up on by the vehicle, the upper non-zero limit on deceleration determined based on a payload carried by the vehicle, a speed of the vehicle, and a grade of a route being traveled upon by the vehicle; monitoring the deceleration of the vehicle; and automatically preventing the deceleration of the vehicle from exceeding the upper non-zero limit by applying a direct current to an alternating current motor of the vehicle, wherein deceleration of the vehicle is prevented from exceeding the upper non-zero limit by supplying the direct current to the alternating current motor of the vehicle to prevent rollback of the vehicle while the vehicle is moving up the grade at a non-zero speed. - View Dependent Claims (13, 14, 15)
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16. A vehicle control system comprising:
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a controller configured to determine a selected direction of travel of a vehicle, an operational direction of an alternating current motor of the vehicle, and an operational speed of the alternating current motor, the controller configured to identify a rollback condition of the vehicle responsive to the operational direction of the motor of the vehicle being different from the selected direction of travel of the vehicle, wherein the controller also is configured to automatically slow or stop movement of the vehicle by applying a direct current to an alternating current motor responsive to the rollback condition being identified and the operational speed of the alternating current motor exceeding a designated, non-zero speed threshold. - View Dependent Claims (17)
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18. A vehicle control system comprising:
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a controller configured to determine a lower limit on speed of a vehicle, the controller configured to determine the lower limit to prevent rollback of the vehicle down a grade being traveled up on by the vehicle, the lower limit determined by the controller based on a payload carried by the vehicle and a grade of a route being traveled upon by the vehicle, wherein the controller is configured to monitor the speed of the vehicle and to automatically prevent the speed of the vehicle from falling below the lower limit by actuating a brake of the vehicle, the controller configured to actuate the brake based on the speed of the vehicle and independent of acceleration of the vehicle, and wherein the controller configured to apply a direct current to an alternating current to prevent rollback of the vehicle while the vehicle is moving up the grade at a non-zero speed. - View Dependent Claims (19, 20)
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Specification