SYSTEM AND METHOD FOR MONITORING OPERATION OF RETARDING GRID ASSOCIATED WITH TRACTION MOTOR OF MACHINE
First Claim
1. A system for monitoring operation of a retarding grid associated with a traction motor of a machine, the system comprising:
- a pressure sensor configured to measure atmospheric pressure;
a temperature sensor configured to measure atmospheric temperature; and
a controller communicably coupled to each of the traction motor, the pressure sensor, and the temperature sensor, the controller configured to;
receive the atmospheric pressure and the atmospheric temperature from the pressure sensor and the temperature sensor respectively;
determine a current air density on the basis of the received atmospheric pressure and temperature;
determine a threshold retarding power limit for the retarding grid on the basis of the current air density;
determine a threshold torque limit for the traction motor on the basis of the determined threshold retarding power limit and a current wheel speed of the machine;
determine a current retarding torque at the traction motor; and
selectively generate a warning signal to an operator of the machine on the basis of the threshold torque limit determined for the traction motor and the current retarding torque at the traction motor.
1 Assignment
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Accused Products
Abstract
A system for monitoring operation of a retarding grid associated with a traction motor of a machine includes a pressure sensor and a temperature sensor for measuring atmospheric pressure and temperature in real time. The system further includes a controller that determines a current air density on the basis of the measured atmospheric pressure and temperature. The controller then determines a threshold retarding power limit for the retarding grid on the basis of the current air density; and a threshold torque limit for the traction motor on the basis of the determined threshold retarding power limit and a current wheel speed of the machine. The controller determines a current retarding torque at the traction motor, and selectively generates a warning signal to an operator of the machine on the basis of the threshold torque limit determined for the traction motor and the current retarding torque at the traction motor.
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Citations
20 Claims
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1. A system for monitoring operation of a retarding grid associated with a traction motor of a machine, the system comprising:
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a pressure sensor configured to measure atmospheric pressure; a temperature sensor configured to measure atmospheric temperature; and a controller communicably coupled to each of the traction motor, the pressure sensor, and the temperature sensor, the controller configured to; receive the atmospheric pressure and the atmospheric temperature from the pressure sensor and the temperature sensor respectively; determine a current air density on the basis of the received atmospheric pressure and temperature; determine a threshold retarding power limit for the retarding grid on the basis of the current air density; determine a threshold torque limit for the traction motor on the basis of the determined threshold retarding power limit and a current wheel speed of the machine; determine a current retarding torque at the traction motor; and selectively generate a warning signal to an operator of the machine on the basis of the threshold torque limit determined for the traction motor and the current retarding torque at the traction motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for monitoring operation of a retarding grid associated with a traction motor of a machine, the method comprising:
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measuring, by a pressure sensor, atmospheric pressure; measuring, by a temperature sensor, atmospheric temperature; and performing, by a controller, the following steps comprising of; receiving the atmospheric pressure and the atmospheric temperature from the pressure sensor and the temperature sensor respectively; determining a current air density on the basis of the received atmospheric pressure and temperature; determining a threshold retarding power limit for the retarding grid on the basis of the current air density; determining a threshold torque limit for the traction motor on the basis of the determined threshold retarding power limit and a current wheel speed of the machine; determining a current retarding torque at the traction motor; and selectively generating a warning signal to an operator of the machine on the basis of the threshold torque limit determined for the traction motor and the current retarding torque at the traction motor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A machine comprising:
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a traction motor; at least one retarding grid communicably coupled to the traction motor, the retarding grid configured to operatively provide electric power to the traction motor; and a system for monitoring operation of the at least one retarding grid, the system comprising; a pressure sensor configured to measure atmospheric pressure; a temperature sensor configured to measure atmospheric temperature; and a controller communicably coupled to each of the traction motor, the pressure sensor, and the temperature sensor, the controller configured to; receive the atmospheric pressure and the atmospheric temperature from the pressure sensor and the temperature sensor respectively; determine a current air density on the basis of the received atmospheric pressure and temperature; determine a threshold retarding power limit for the retarding grid on the basis of the current air density; determine a threshold torque limit for the traction motor on the basis of the determined threshold retarding power limit and a current wheel speed of the machine; determine a current retarding torque at the traction motor; and selectively generate a warning signal to an operator of the machine on the basis of the threshold torque limit determined for the traction motor and the current retarding torque at the traction motor, wherein the controller is configured to generate the warning signal if the current retarding torque at the traction motor approaches the threshold torque limit determined for the traction motor. - View Dependent Claims (18, 19, 20)
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Specification