Engine load management for traction vehicles
First Claim
1. A method of load management within an electric drive system, the electric drive system including an engine having an output for driving an electrical power generator, the electrical power generator providing power to one or more electric drive motors, the method comprising:
- receiving an actual fuel signal indicative of an amount of fuel commanded to the engine;
receiving an engine speed signal indicative of a rotational speed of the output for driving the electrical power generator;
receiving a throttle position signal indicative of an acceleration or deceleration commanded by an operator of a machine;
receiving a motor speed signal indicative of a rotating speed of the one or more electric drive motors;
receiving a barometric pressure signal indicative of an altitude of operation of the machine;
receiving an intake air temperature signal indicative of an ambient temperature;
receiving an intake air pressure signal indicative of a pressure of air within an intake manifold of the engine;
determining a torque limit to limit a torque command to the one or more electric drive motors based on the received signals such that the torque command is consistent with the operating capabilities of the engine.
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Accused Products
Abstract
An electric drive system includes a fuel-driven engine (202) driving an electrical power generator (204) that provides power to one or more electric drive motors (210). A method of load management in the electric drive system includes receiving an actual fuel signal, an engine speed (920) signal, a throttle position signal, a motor speed (712) signal, an intake air pressure, a barometric pressure signal, and an intake air temperature signal. These values are used to determine a torque limit. The torque limit is used to limit a torque command to the electric drive motors (210) such that the torque command is consistent with the operating capabilities of the engine (202).
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Citations
20 Claims
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1. A method of load management within an electric drive system, the electric drive system including an engine having an output for driving an electrical power generator, the electrical power generator providing power to one or more electric drive motors, the method comprising:
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receiving an actual fuel signal indicative of an amount of fuel commanded to the engine; receiving an engine speed signal indicative of a rotational speed of the output for driving the electrical power generator; receiving a throttle position signal indicative of an acceleration or deceleration commanded by an operator of a machine; receiving a motor speed signal indicative of a rotating speed of the one or more electric drive motors; receiving a barometric pressure signal indicative of an altitude of operation of the machine; receiving an intake air temperature signal indicative of an ambient temperature; receiving an intake air pressure signal indicative of a pressure of air within an intake manifold of the engine; determining a torque limit to limit a torque command to the one or more electric drive motors based on the received signals such that the torque command is consistent with the operating capabilities of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A computer-readable medium having thereon computer-executable instructions for performing load management within an electric drive system including an engine having an output for driving an electrical power generator, the electrical power generator providing power to one or more electric drive motors, the computer-executable instructions comprising:
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instructions for receiving an actual fuel signal indicative of an amount of fuel commanded to the engine; instructions for receiving an engine speed signal indicative of a rotational speed of the output driving the electrical power generator; instructions for receiving a throttle position signal indicative of an acceleration or deceleration commanded by an operator of a machine; instructions for receiving a motor speed signal indicative of a rotating speed of the one or more electric drive motors; instructions for receiving a barometric pressure signal indicative of an altitude of operation of the machine; instructions for receiving an intake air temperature signal indicative of an ambient temperature; and instructions for determining a torque limit to limit a torque command to the one or more electric drive motors based on the received values such that the torque command is consistent with the operating capabilities of the engine. - View Dependent Claims (13, 14, 15, 16)
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17. A controller for managing an engine load within an electric drive system, the electric drive system including an engine having an output for driving an electrical power generator, the electrical power generator providing power to one or more electric drive motors, the controller comprising:
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an engine predictive subroutine for calculating a maximum allowable torque that may be produced by the one or more electric drive motors in a present operational state of the engine; and a motor command modification function for receiving and modifying a motor command to yield a modified command that is consistent with the maximum allowable torque. - View Dependent Claims (18, 19, 20)
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Specification