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US 11,235,773 B2Granted
Control device for vehicle power transmission device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroyuki Aono, Naoki Hiura
Life of this patent
Estimating the term…
Abstract
An electronic control unit engages two of friction engagement elements provided in an automatic transmission in a neutral range. The electronic control unit disengages one of the two friction engagement elements engaged in the neutral range at the time of starting gear stage switching of an auxiliary transmission from a low-speed gear stage to a high-speed gear stage in the neutral range, and re-engages the friction engagement element that has been disengaged when determining that the gear stage switching has been completed.
Claims4
A control device for a vehicle power transmission device,
- the control device being applied to the vehicle power transmission device, the vehicle power transmission device including an automatic transmission and an auxiliary transmission, the automatic transmission changing a combination of friction engagement elements to be engaged, among a plurality of friction engagement elements, to change a gear train in accordance with a shift range, and establishing a neutral range in a state where two or more of friction engagement elements are engaged in a shift range that is used at a time of starting a vehicle, and the auxiliary transmission being provided on a power transmission path between the automatic transmission and a driving wheel,
- the control device performing gear stage switching of the auxiliary transmission when the shift range is the neutral range, and
- the control device executing, at a time of starting the gear stage switching, a disengagement process of disengaging one or more friction engagement elements while maintaining engagement of one or more friction engagement elements, among the friction engagement elements that are engaged in the neutral range, and executing a re-engagement process of re-engaging the friction engagement elements disengaged in the disengagement process when determining that the gear stage switching has been completed.
Dependencies are inferred from the claim text.