Torque estimation method for an internal combustion engine
First Claim
Patent Images
1. A method for use with an internal combustion engine in a powertrain coupled to a device having an input speed and an output speed, comprising:
- indicating that powertrain output torque is less than a predetermined value based on the input speed and the output speed of the device; and
learning a powertrain torque adjustment value in response to said indication.
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Abstract
A method is presented for correcting estimates of engine output torque and accessory load torque. Engine output torque estimates are corrected when the accessory is disengaged from the engine. Accessory load torque is learned, or corrected, when the accessory is engaged to the engine. In one example, these corrections are made when engine output torque is known to be substantially zero from torque converter speed ratio or from the timing of the overrunning clutch engagement. This information is then used to control engine output torque to improve drive feel and vehicle performance.
48 Citations
22 Claims
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1. A method for use with an internal combustion engine in a powertrain coupled to a device having an input speed and an output speed, comprising:
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indicating that powertrain output torque is less than a predetermined value based on the input speed and the output speed of the device; and
learning a powertrain torque adjustment value in response to said indication. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A powertrain torque estimation method for use with an internal combustion engine in a powertrain coupled to a device having an input speed and an output speed, comprising:
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indicating that powertrain output torque is less than a predetermined value based on the input speed and the output speed of the device, learning a powertrain torque adjustment value in response to said indication, calculating actual powertrain torque based on a powertrain operating condition and said powertrain adjustment value, determining desired powertrain torque based on an operator input; and
controlling a powertrain parameter to reduce a difference between said actual powertrain torque and said desired powertrain torque. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An article of manufacture comprising a computer storage medium having a computer program encoded therein for use with an internal combustion engine in a powertrain coupled to a device having an input speed and an output speed, said computer storage medium comprising:
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code for indicating that powertrain output torque is less than a predetermined value based on the input speed and the output speed of the device;
code for learning a powertrain torque adjustment value in response to said indication;
code for calculating actual powertrain torque based on a powertrain operating condition and said powertrain adjustment value;
code for determining desired powertrain torque based on an operator input; and
code for controlling a powertrain parameter to reduce the difference between said actual powertrain torque and said desired powertrain torque.
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Specification