Vehicle transmission clutch engagement control system
AssigneeFord Global Technologies, LLC
InventorsGregory Michael Pietron, Qi Wang, Yuji Fujii, Rohit Hippalgaonkar, Joseph F. Kucharski, Jason Meyer, Stuart N. Ford
Life of this patent
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Abstract
A vehicle includes a transmission and a controller. The transmission has clutches that are configured to establish multiple speed ratios, including a first clutch. The first clutch has a measured drag torque distribution. The measured drag torque distribution has a median and a standard deviation. The controller is programmed to increase a pressure at a rate to engage the first clutch and to increase the rate in response to a measured first clutch torque exceeding the median by a predetermined multiple of the standard deviation.
Claims20
A vehicle comprising:
- a transmission having clutches configured to establish multiple speed ratios, including a first clutch having a measured drag torque distribution with a median and a standard deviation;
- and
- a controller programmed to increase a pressure at a rate to engage the first clutch and to increase the rate in response to a measured first clutch torque exceeding the median by a predetermined multiple of the standard deviation.
A vehicle transmission comprising:
- an oncoming clutch having a measured fluctuating torque when disengaged, the fluctuating torque having a non-zero median value and a standard deviation;
- and
- a controller programmed to, in response to a torque of the oncoming clutch increasing at a first rate during an engagement and surpassing the non-zero median value by a multiple of the standard deviation, increase the torque at a second rate that is greater than the first rate.
A method comprising:
- providing an oncoming clutch for a vehicle transmission, the oncoming clutch having a measured fluctuating disengaged torque that has a median value and a standard deviation;
- and
- increasing a rate at which torque of the oncoming clutch increases during an engagement in response to the torque of the oncoming clutch surpassing the median value by predetermined a multiple of the standard deviation.
Dependencies are inferred from the claim text.