Method for controlling input torque provided to a transmission
First Claim
1. A method for controlling an input torque provided to a transmission, said method comprising:
- executing a first iterative search within a first range of permissible torque values to determine a first torque value based on a first cost value, the first cost value being based on a first set of powertrain measurements measured at a first time;
calculating a second cost value based on a second torque value and the first set of powertrain measurements measured at the first time, the second for torque value being determined using a second set of powertrain measurements measured at a second time, the second time being prior to the first time; and
selecting one of the first torque value and the second torque value based on the first cost value and the second cost value;
wherein the first search function executes less than ten iteration steps; and
wherein at a ninth iteration step a torque value candidate tolerance level is less than +/−
6 Newton-meters.
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Accused Products
Abstract
A method for controlling an input torque provided to a transmission includes executing a first iterative search within a first range of permissible torque values to determine a first torque value based on a first cost value. The first cost value is based on a first set of powertrain measurements measured at a first time. A second cost value based on a second torque value and the first set of powertrain measurements measured at the first time is calculated. The second torque value is determined using a second set of powertrain measurements measured at a second time prior to the first time. One of the first torque value and the second torque value is then selected based on the first cost value and the second cost value.
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Citations
18 Claims
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1. A method for controlling an input torque provided to a transmission, said method comprising:
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executing a first iterative search within a first range of permissible torque values to determine a first torque value based on a first cost value, the first cost value being based on a first set of powertrain measurements measured at a first time; calculating a second cost value based on a second torque value and the first set of powertrain measurements measured at the first time, the second for torque value being determined using a second set of powertrain measurements measured at a second time, the second time being prior to the first time; and selecting one of the first torque value and the second torque value based on the first cost value and the second cost value; wherein the first search function executes less than ten iteration steps; and wherein at a ninth iteration step a torque value candidate tolerance level is less than +/−
6 Newton-meters. - View Dependent Claims (2)
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3. A method for controlling an input torque provided to a transmission, said method comprising:
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executing a first iterative search within a first range of permissible torque values to determine a first torque value associated with a first cost value, said first range of permissible torque values being based on a first engine condition measurement measured at a first time, said first cost value being based on a first set of powertrain measurements measured at the first time; executing a second iterative search function within a second range of permissible torque values to determine a second torque value associated with a second cost value, said second range of permissible torque values being based on a second engine condition measurement measured at a second time, said second cost value being based on a second set of powertrain measurements measured at the second time; calculating a third cost value using the first torque value, the third cost value being based on the second set of powertrain measurements; selecting either the first torque value or the second torque value based on the second cost value and the third cost value; and controlling operation of an engine to achieve the selected one of the first and second torque values. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for controlling an input torque provided to a transmission, said method comprising:
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iteratively determining a first torque value based on a first cost value at a first time, and a second torque value based on a second cost value at a second time; calculating a third cost value at the second time based on the first torque value; and selecting either the first torque value or the second torque value based on a lower cost value at the second time. - View Dependent Claims (17, 18)
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Specification