Method for controlling a transmission coupled to an engine that may be automatically stopped
First Claim
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1. A method for controlling a transmission coupled to an engine during an engine start, comprising:
- applying a first pressure to a clutch tying a transmission input shaft to a transmission case during a first engine start; and
applying a second pressure to the clutch tying the transmission input shaft to the transmission case during a second engine start, where the second pressure is applied based on the first pressure and an operating condition of the transmission.
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Abstract
Methods and systems for controlling a transmission coupled to an engine during an engine start are presented. In one example, a method adjusts a transmission tie-up force in response to an indication of transmission slip. The method may improve vehicle launch for stop/start vehicles.
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Citations
19 Claims
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1. A method for controlling a transmission coupled to an engine during an engine start, comprising:
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applying a first pressure to a clutch tying a transmission input shaft to a transmission case during a first engine start; and applying a second pressure to the clutch tying the transmission input shaft to the transmission case during a second engine start, where the second pressure is applied based on the first pressure and an operating condition of the transmission. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a transmission coupled to an engine during an engine start, comprising:
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applying a first clutch to tie a transmission input shaft to a transmission case during a first engine start; and adjusting an oil pressure supplied to the first clutch during a second engine start in response to a delay time between engine speed and an indication of transmission input shaft acceleration during the first engine start. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system for controlling a transmission during an engine start, comprising:
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an engine; a transmission coupled to the engine, the transmission including a tie-up clutch that couples an input shaft of the transmission to a case of the transmission; an engine speed sensor; a transmission input shaft speed sensor; and a controller including executable instructions stored in a non-transitory medium to adjust an oil pressure supplied to the tie-up clutch in response to a delay time between an output of the engine speed sensor and an output of the transmission input shaft speed sensor. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification