CONTINUOUS VARIABLE CONTROL METHODS FOR HYDRAULIC POWERTRAIN SYSTEMS OF A VEHICLE
First Claim
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1. A method of controlling a powertrain of a vehicle comprising:
- generating an engine torque versus engine revolutions per minute (RPM) reference for an engine of the powertrain;
determining a current engine speed of said engine; and
generating a fuel input signal and a continuous variable transmission control signal in response to said engine torque versus engine RPM reference and said current engine speed to maintain an approximately constant engine speed for a plurality of engine loading conditions.
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Abstract
A method of controlling a powertrain of a vehicle includes the generation of an engine torque versus engine revolutions per minute (RPM) reference for an engine. A current engine speed is determined. A fuel input signal and a continuous variable transmission control signal are generated in response to the engine torque versus engine RPM reference and the current engine speed to maintain an approximately constant engine speed for various engine loading conditions.
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Citations
21 Claims
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1. A method of controlling a powertrain of a vehicle comprising:
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generating an engine torque versus engine revolutions per minute (RPM) reference for an engine of the powertrain;
determining a current engine speed of said engine; and
generating a fuel input signal and a continuous variable transmission control signal in response to said engine torque versus engine RPM reference and said current engine speed to maintain an approximately constant engine speed for a plurality of engine loading conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A powertrain system control circuit comprising:
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a memory having a stored engine torque versus engine rpm reference;
an engine speed sensor generating an engine speed signal; and
a controller coupled to said memory and said engine speed sensor and generating a fuel input signal and a continuous variable transmission control signal in response to said engine torque versus engine rpm reference and said engine speed signal to maintain an approximately constant engine speed for a plurality of engine loading conditions. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A powertrain system comprising:
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an engine;
an engine speed sensor generating an engine speed signal;
at least one hydraulic pump coupled to said engine;
at least one drive motor coupled to and receiving a hydraulic fluid from said at least one hydraulic pump, said at least one drive motor supplying energy for translation of the vehicle in response to said received hydraulic fluid; and
a controller coupled to said engine, said engine speed sensor, said at least one hydraulic pump, and said at least one drive motor, and generating a fuel input signal, a hydraulic pump signal, and a drive motor signal in response to at least one efficiency reference and said engine speed signal to maintain an approximately constant engine speed for a plurality of engine loading conditions. - View Dependent Claims (20, 21)
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Specification