Method for controlling a hybrid powertrain system based upon hydraulic pressure and clutch reactive torque capacity
First Claim
1. Method for controlling a powertrain system including an engine coupled to an electro-mechanical transmission to transfer power between the engine and a plurality of torque generating machines and an output member, the transmission operative in one of a plurality of operating range states through selective application of torque transfer clutches and the engine operatively coupled to a main hydraulic pump to supply pressurized fluid to a hydraulic circuit operative to apply the torque transfer clutches, the method comprising:
- determining an output torque request to the output member;
determining a pressure output of the main hydraulic pump based upon an engine input speed;
calculating a clutch reactive torque capacity for each applied torque transfer clutch based upon the pressure output of the main hydraulic pump; and
determining a preferred engine input speed to achieve the clutch reactive torque capacity to meet the output torque request to the output member.
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Accused Products
Abstract
A powertrain system includes an engine coupled to an electro-mechanical transmission to transfer power between the engine and a plurality of torque generating machines and an output member. The transmission is operative in one of a plurality of operating range states through selective application of torque transfer clutches and the engine is operatively coupled to a main hydraulic pump to supply pressurized fluid to a hydraulic circuit operative to apply the torque transfer clutches. A method for controlling the powertrain system includes determining an output torque request to the output member, determining a pressure output of the main hydraulic pump based upon an engine input speed, calculating a clutch reactive torque capacity for each applied torque transfer clutch based upon the pressure output of the main hydraulic pump, and determining a preferred engine input speed to achieve the clutch reactive torque capacity to meet the output torque request to the output member.
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Citations
15 Claims
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1. Method for controlling a powertrain system including an engine coupled to an electro-mechanical transmission to transfer power between the engine and a plurality of torque generating machines and an output member, the transmission operative in one of a plurality of operating range states through selective application of torque transfer clutches and the engine operatively coupled to a main hydraulic pump to supply pressurized fluid to a hydraulic circuit operative to apply the torque transfer clutches, the method comprising:
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determining an output torque request to the output member; determining a pressure output of the main hydraulic pump based upon an engine input speed; calculating a clutch reactive torque capacity for each applied torque transfer clutch based upon the pressure output of the main hydraulic pump; and determining a preferred engine input speed to achieve the clutch reactive torque capacity to meet the output torque request to the output member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Method for controlling a powertrain system including an engine coupled to an electro-mechanical transmission to transfer power between the engine and a plurality of torque generating machines and an output member, the transmission operative in one of a plurality of operating range states through selective application of torque transfer clutches and the engine operatively coupled to a main hydraulic pump to supply pressurized fluid to a hydraulic circuit operative to apply the torque transfer clutches, the method comprising:
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determining an output torque request to the output member; determining a pressure output of the main hydraulic pump based upon an engine input speed; calculating a clutch reactive torque capacity for the applied torque transfer clutch based upon the pressure output of the main hydraulic pump; and controlling the engine to a preferred engine input speed to achieve the clutch reactive torque capacity and controlling the torque generating machines to meet the output torque request to the output member. - View Dependent Claims (14)
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15. Method for controlling a powertrain system including a hybrid transmission operative to transfer power between an engine and a torque machine and an output member through application of torque transfer clutches, the engine operatively coupled to a main hydraulic pump to supply pressurized fluid to a hydraulic circuit operative to apply the torque transfer clutches, the method comprising:
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determining an output torque request to the output member; determining a pressure output of the main hydraulic pump based upon an engine input speed; calculating clutch reactive torque capacity for the applied torque transfer clutch based upon the pressure output of the main hydraulic pump; and controlling the engine to a preferred engine input speed to achieve the clutch reactive torque capacity and controlling the torque generating machines to meet the output torque request to the output member.
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Specification