HYDRAULIC CONTROL DEVICE OF AUTOMATIC TRANSMISSION

摘要

A hydraulic control device that includes two hydraulic oil chambers, wherein a predetermined engagement element of the engagement elements is an engagement element that includes the two hydraulic oil chambers and is engageable and disengageable when an engagement pressure is supplied to and discharged from at least one of the two hydraulic oil chambers, and a control unit that reduces supply of the engagement pressure to one of the two hydraulic oil chambers to a level lower than that in a state in which a first shift speed is established, when the control unit performs shifting from the state in which the first shift speed is established by supplying the engagement pressures to both of the two hydraulic oil chambers and engaging the predetermined engagement element to a second shift speed by switching engagement and disengagement states of engagement elements other than the predetermined engagement element.

主权项

1. A hydraulic control device of an automatic transmission including a plurality of engagement elements and being capable of establishing a plurality of shift speeds by simultaneously engaging at least selected two of the engagement elements, the hydraulic control device comprising:
two hydraulic oil chambers, wherein a predetermined engagement element of the engagement elements is an engagement element with the two hydraulic oil chambers and is engageable and disengageable when an engagement pressure is supplied to and discharged from at least one of the two hydraulic oil chambers, and a control unit that reduces supply of the engagement pressure to one of the two hydraulic oil chambers to a level lower than that in a state in which a first shift speed is established, when the control unit performs shifting from the state in which the first shift speed is established by supplying the engagement pressures to both of the two hydraulic oil chambers and engaging the predetermined engagement element to a second shift speed by switching engagement and disengagement states of engagement elements other than the predetermined engagement element.