METHOD AND SYSTEM FOR REDUCING TIP-OUT OSCILLATION EFFECTS IN AN AUTOMATIC TRANSMISSION
First Claim
1. A method for reducing oscillation in an automotive transmission system, the method comprising:
- detecting a tip-out of an accelerator pedal position;
responsive to said detected tip-out, adjusting a pressure command for a selected range clutch within the transmission system so as to reduce the pressure of said selected range clutch from a normal pressure level to a low pressure level, thereby producing a desired gear train slip in the transmission system; and
re-adjusting said pressure command of said selected range clutch after a determined period of time at said low pressure level so as to increase the pressure of said selected range clutch from said low pressure level, and thereby eliminating said gear train slip.
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Abstract
A method for reducing oscillation in an automotive transmission system includes detecting a tip-out of an accelerator pedal position. Responsive to the detected tip-out, a pressure command is adjusted for a selected range clutch within the transmission system so as to reduce the pressure of the selected range clutch from a normal pressure level to a low pressure level, thereby producing a desired gear train slip in the transmission system. Then, the pressure command of the selected range clutch is re-adjusted after a determined period of time at the low pressure level so as to increase the pressure of the selected range clutch from the low pressure level, and thereby eliminating the gear train slip.
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Citations
16 Claims
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1. A method for reducing oscillation in an automotive transmission system, the method comprising:
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detecting a tip-out of an accelerator pedal position;
responsive to said detected tip-out, adjusting a pressure command for a selected range clutch within the transmission system so as to reduce the pressure of said selected range clutch from a normal pressure level to a low pressure level, thereby producing a desired gear train slip in the transmission system; and
re-adjusting said pressure command of said selected range clutch after a determined period of time at said low pressure level so as to increase the pressure of said selected range clutch from said low pressure level, and thereby eliminating said gear train slip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for reducing oscillation in an automotive transmission system, comprising:
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sensing means for detecting a tip-out of an accelerator pedal position;
a controller for adjusting a pressure command for a selected range clutch within the transmission system, in response to said detected tip-out, so as to reduce the pressure of said selected range clutch from a normal pressure level to a low pressure level, thereby producing a desired gear train slip in the transmission system; and
said controller re-adjusting said pressure command of said selected range clutch after a determined period of time at said low pressure level so as to increase the pressure of said selected range clutch from said low pressure level, and thereby eliminating said gear train slip. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification