Method and system for controlling torque in an electric drive powertrain
First Claim
1. A method of controlling an electric drive powertrain system of a machine, the machine including an inverter, a transmission having a plurality of selectable gears, and a transmission control unit including a memory unit and a processor, comprising:
- providing an electric motor capable of running between a motor minimum speed and a motor maximum speed, the electric motor configured to produce torque between a first region defined between the motor minimum speed and a motor base speed and a second region defined between the motor base speed and the motor maximum speed;
receiving a signal from one or more operator control inputs;
determining a desired transmission output torque based on the signal received from the one or more operator inputs;
determining a desired motor torque based on the desired transmission output torque;
while operating the electric motor in the first region, controllably operating the electric motor at a current less than or equal to an amount of current required at a maximum motor torque at the motor base speed; and
producing a greater amount of torque at the motor base speed than an amount of torque produced at the motor minimum speed.
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Accused Products
Abstract
This disclosure provides a method of controlling an electric drive powertrain system. The method includes providing an electric motor capable of running between a motor minimum speed and a motor maximum speed such that the electric motor can produce different amounts of torque between a first region defined between the motor minimum speed and a motor base speed and a second region defined between the motor base speed and the motor maximum speed. The method includes receiving a signal from operator inputs and determining a desired transmission output torque based on the signal received from the operator inputs. The method also includes determining a desired motor torque based on the desired transmission output torque, operating the electric motor at a current corresponding to the desired motor torque and producing a greater amount of torque at the motor base speed than at the motor minimum speed.
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Citations
20 Claims
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1. A method of controlling an electric drive powertrain system of a machine, the machine including an inverter, a transmission having a plurality of selectable gears, and a transmission control unit including a memory unit and a processor, comprising:
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providing an electric motor capable of running between a motor minimum speed and a motor maximum speed, the electric motor configured to produce torque between a first region defined between the motor minimum speed and a motor base speed and a second region defined between the motor base speed and the motor maximum speed; receiving a signal from one or more operator control inputs; determining a desired transmission output torque based on the signal received from the one or more operator inputs; determining a desired motor torque based on the desired transmission output torque; while operating the electric motor in the first region, controllably operating the electric motor at a current less than or equal to an amount of current required at a maximum motor torque at the motor base speed; and producing a greater amount of torque at the motor base speed than an amount of torque produced at the motor minimum speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for controlling an electric motor of an electric drive powertrain for a work machine, comprising:
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a plurality of operator inputs configured to control the machine; a transmission having a plurality of selectable gears; a transmission control unit for controlling the transmission, the transmission control unit including a memory unit and a processor; and an electric motor coupled to an output of the inverter and an input of the transmission, the electric motor being operable between a motor minimum speed and a motor maximum speed; wherein, the motor is controllable to produce torque between a first region of motor speeds defined between the motor minimum speed and a motor base speed and a second region of motor speeds defined between the motor base speed and the motor maximum speed; further wherein, a set of instructions is stored in the memory unit of the transmission control unit and executed by the processor, the set of instructions being executed to receive a signal from each of the plurality of operator inputs, determine a desired transmission output torque based on the signal received, determine a desired motor torque based on the desired transmission output torque, controllably operate the electric motor at a current less than or equal to an amount of current required at a maximum motor torque at the motor base speed, and produce a greater amount of torque at the motor base speed than a first amount of torque produced at the motor minimum speed. - View Dependent Claims (12, 13, 14, 15)
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16. A method of controlling an amount of torque produced by an electric drive powertrain system of a machine, the machine including one or more operator inputs, an inverter, a transmission having a plurality of selectable gears, and a transmission control unit including a memory unit and a processor, comprising:
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providing an electric motor capable of running between a motor minimum speed and a motor maximum speed, the electric motor configured to produce torque between a first range of motor speeds defined between the motor minimum speed and a motor base speed and a second range of motor speeds defined between the motor base speed and the motor maximum speed; storing a maximum torque curve in the memory unit; operating the electric motor at a motor speed between the motor minimum speed and the motor maximum speed; receiving a signal from the one or more operator control inputs; determining a desired transmission output torque based on the signal received from the one or more operator inputs; determining a desired motor torque based on the desired transmission output torque; determining a maximum torque limit from the maximum torque curve at the motor speed; comparing the desired motor torque with the maximum torque limit; determining an amount of current to supply to the electric motor to produce the desired motor torque; producing the desired motor torque if the desired motor torque is less than the maximum torque limit; and producing a first amount of torque at the motor minimum speed and a second amount of torque at the motor base speed, wherein the first amount of torque is less than the second amount of torque. - View Dependent Claims (17, 18, 19, 20)
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Specification