Drive torque transfer scheme
First Claim
1. A method of controlling torque transfer in a drive train of a wheeled vehicle, said drive train comprising a source of power, a first driveline, a second driveline, and a torque transfer unit configured to couple said source of power to said first and second drivelines, said method comprising:
- generating a delta signal indicative of a rotational condition of said first driveline; and
controlling said torque transfer unit as a function of a torque transfer control algorithm, wherein said torque transfer control algorithm is a function of said delta signal indicative of said rotational condition of said first driveline, said torque transfer control algorithm is substantially independent of any rotational condition of said second driveline over a primary operational range of said algorithm; and
said torque transfer control algorithm commands a transfer torque representing an amount of torque to transfer from said source of power to one of said first and second drivelines.
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Accused Products
Abstract
The present invention relates to methods of torque transfer, torque transfer units, and vehicles incorporating the same. According to the method, a delta signal indicative of a rotational condition of the first driveline is generated and a torque transfer unit is controlled as a function of a torque transfer control algorithm. The control algorithm commands a transfer torque representing an amount of torque to transfer from the source of power to one of the first and second drivelines. The torque transfer control algorithm is a function of the delta signal and is substantially independent of any rotational condition of the second driveline over a primary operational range of the algorithm. Reference values may comprise a desired vehicle acceleration value, an actual vehicle acceleration value, a vehicle ground speed value, temporally displaced first driveline acceleration values, temporally displaced first driveline speed values, and combinations thereof.
106 Citations
78 Claims
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1. A method of controlling torque transfer in a drive train of a wheeled vehicle, said drive train comprising a source of power, a first driveline, a second driveline, and a torque transfer unit configured to couple said source of power to said first and second drivelines, said method comprising:
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generating a delta signal indicative of a rotational condition of said first driveline; and
controlling said torque transfer unit as a function of a torque transfer control algorithm, wherein said torque transfer control algorithm is a function of said delta signal indicative of said rotational condition of said first driveline, said torque transfer control algorithm is substantially independent of any rotational condition of said second driveline over a primary operational range of said algorithm; and
said torque transfer control algorithm commands a transfer torque representing an amount of torque to transfer from said source of power to one of said first and second drivelines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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66. A method of controlling torque transfer in a drive train of a wheeled vehicle, said drive train comprising a source of power, a first driveline, a second driveline, and a torque transfer unit configured to couple said source of power to said first and second drivelines, said method comprising:
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generating a delta signal indicative of a difference between a reference value and a rotational condition of said first driveline, wherein said reference value comprises a desired vehicle acceleration value determined as a function of maximum output torque, a desired torque command signal generated by a throttle position sensor, vehicle weight, and grade, and said rotational condition of said first driveline is indicative of a temporal change in one of rotational speed or rotational acceleration of said first driveline; and
controlling said torque transfer unit as a function of a torque transfer control algorithm, wherein said torque transfer control algorithm is a function of said delta signal indicative of said rotational condition of said first driveline, said torque transfer control algorithm commands a transfer torque representing an amount of torque to transfer from said source of power to one of said first and second drivelines.
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67. A method of controlling torque transfer in a drive train of a wheeled vehicle, said drive train comprising a source of power, a first driveline, a second driveline, and a torque transfer unit configured to couple said source of power to said first and second drivelines, said method comprising:
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generating a delta signal indicative of a rotational condition of said first driveline, wherein said delta signal comprises a signal indicative of a difference between a reference value and a selected one of a plurality of different rotational conditions of said first driveline, including a primary rotational condition and at least one alternative rotational condition, and wherein said reference value comprises one of a desired vehicle acceleration value, an actual vehicle acceleration value, a vehicle ground speed value, temporally displaced first driveline acceleration values, temporally displaced first driveline speed values, and combinations thereof; and
controlling said torque transfer unit as a function of a torque transfer control algorithm, wherein said control algorithm determines said selected rotational condition and exhibits a preference for said alternative rotational condition over said primary rotational condition when a difference between said reference value and said rotational condition does not exceed a torque transfer threshold and when a difference between said reference value and said alternative rotational condition exceeds said torque transfer threshold, said torque transfer control algorithm is a function of said delta signal indicative of said selected rotational condition of said first driveline, and said torque transfer control algorithm commands a transfer torque representing an amount of torque to transfer from said source of power to one of said first and second drivelines.
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68. A torque transfer unit configured to couple a source of power to said first and second drivelines of a wheeled vehicle, said transfer unit comprising a controller programmed to:
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generate a delta signal indicative of a rotational condition of said first driveline; and
control said torque transfer unit as a function of a torque transfer control algorithm, wherein said torque transfer control algorithm is a function of said delta signal indicative of said rotational condition of said first driveline, said torque transfer control algorithm is substantially independent of any rotational condition of said second driveline over a primary operational range of said algorithm; and
said torque transfer control algorithm commands a transfer torque representing an amount of torque to transfer from said source of power to one of said first and second drivelines. - View Dependent Claims (69, 70, 71)
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72. A vehicle comprising:
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a source of power;
a first driveline including a first set of driven wheels;
a second driveline including a second set of driven wheels; and
a torque transfer unit configured to couple said source of power to said first and second drivelines, said torque transfer unit comprising a controller programmed to generate a delta signal indicative of a rotational condition of said first driveline, and control said torque transfer unit as a function of a torque transfer control algorithm, wherein said torque transfer control algorithm is a function of said delta signal indicative of said rotational condition of said first driveline, said torque transfer control algorithm is substantially independent of any rotational condition of said second driveline over a primary operational range of said algorithm, and said torque transfer control algorithm commands a transfer torque representing an amount of torque to transfer from said source of power to one of said first and second drivelines. - View Dependent Claims (73, 74, 75, 76, 77)
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78. A method of controlling torque transfer in a drive train of a wheeled vehicle, said drive train comprising a source of power, a first driveline, a second driveline, and a torque transfer unit configured to couple said source of power to said first and second drivelines, said method comprising:
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generating a delta signal indicative of a rotational condition of said first driveline, wherein said delta signal is totally independent of any rotational condition of said second driveline; and
controlling said torque transfer unit as a function of a torque transfer control algorithm, wherein said torque transfer control algorithm is a function of said delta signal indicative of said rotational condition of said first driveline; and
said torque transfer control algorithm commands a transfer torque representing an amount of torque to transfer from said source of power to one of said first and second drivelines.
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Specification