Effective driveline vibration detection algorithm in transmission TCC slip control
First Claim
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1. A method for determining a desired torque converter slip for a torque converter that transfers torque between a vehicle engine and a vehicle transmission, said method comprising:
- setting a predetermined minimum converter slip for the torque converter for a certain transmission gear, engine speed and engine torque;
providing a sensor signal from a sensor at an output of the transmission that measures transmission output behavior;
transforming the sensor signal to a frequency signal;
determining whether an amplitude of the frequency signal exceeds a predetermined threshold; and
increasing the minimum converter slip a predetermined amount if the frequency signal does exceed the predetermined threshold, or decreasing the minimum converter slip predetermined amount if the frequency signal is below the predetermined threshold.
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Abstract
A method for adjusting the slip of a torque converter for a plurality of selected engine speeds, transmission gears and engine torque. A sensor is used to determine vibrations transmitted through the torque converter to the driveline of the vehicle. The sensor signal is sent to a controller where it is converted to the frequency domain. If the amplitude of the frequency signal exceeds a threshold, then the algorithm increases/decreases the converter slip until the driveline vibrations equal a threshold.
22 Citations
20 Claims
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1. A method for determining a desired torque converter slip for a torque converter that transfers torque between a vehicle engine and a vehicle transmission, said method comprising:
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setting a predetermined minimum converter slip for the torque converter for a certain transmission gear, engine speed and engine torque; providing a sensor signal from a sensor at an output of the transmission that measures transmission output behavior; transforming the sensor signal to a frequency signal; determining whether an amplitude of the frequency signal exceeds a predetermined threshold; and increasing the minimum converter slip a predetermined amount if the frequency signal does exceed the predetermined threshold, or decreasing the minimum converter slip predetermined amount if the frequency signal is below the predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining a desired torque converter slip in real-time for a torque converter that transfers torque between a vehicle engine and a vehicle transmission, said method comprising:
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setting a predetermined minimum converter slip for the torque converter for a selected transmission gear, engine speed and engine torque; providing a sensor signal from a sensor that measures transmission output behavior; analyzing the sensor signal to determine whether the predetermined minimum converter slip would cause significant engine disturbance signals to be transferred to the transmission through the torque converter; and increasing the minimum converter slip a predetermined amount if the predetermined minimum converter slip would cause significant engine disturbance signals to be transferred to the transmission through the torque converter. - View Dependent Claims (10, 11, 12, 13)
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14. A system for determining a desired torque converter slip for a torque converter that transfers torque between a vehicle engine and a vehicle transmission, said system comprising:
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means for setting a predetermined minimum converter slip for a torque converter for a particular transmission gear, engine speed and engine torque; means for providing a sensor signal from a sensor at an output of the transmission that measures transmission output behavior; means for transforming the sensor signal to a frequency signal; and means for increasing or decreasing the minimum converter slip by a predetermined amount so that the driveline vibrations are near a predetermined threshold. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification