Patent ID: 9206894
Filing Date: 2015-12-08
Classification: F16H

Abstract:
1. A control device for a speed change device including a speed change mechanism including at least three or more friction engagement elements and capable of establishing a plurality of shift speeds by engaging two or more of the three or more friction engagement elements concurrently with each other, and a plurality of pressure regulation valves that each regulate a hydraulic pressure for the corresponding friction engagement element on the basis of a target hydraulic pressure, the control device configured to: determine a part of the two or more friction engagement elements engaged concurrently with each other as an abnormal-time engagement element and determining a remainder of the two or more friction engagement elements as an abnormal-time slipping element, the abnormal-time engagement element being kept engaged when an abnormality occurs in which at least one friction engagement element other than the two or more friction engagement elements is engaged during concurrent engagement of the two or more friction engagement elements, and the abnormal-time slipping element being caused to slip when the abnormality occurs; set respective target hydraulic pressures for pressure regulation valves corresponding to the two or more friction engagement elements on the basis of input torque for the speed change mechanism and a torque distribution ratio determined in advance such that the two or more friction engagement elements are not caused to slip with the shift speed established through engagement of the two or more friction engagement elements and such that the abnormal-time slipping element is caused to slip when the abnormality occurs; and set respective target hydraulic pressures for the pressure regulation valves corresponding to the two or more friction engagement elements such that the abnormal-time slipping element is supplied with a hydraulic pressure matching distributed torque based on the input torque and a torque distribution ratio for the abnormal-time slipping element determined in advance in accordance with the shift speed, and such that the abnormal-time engagement element is supplied with a hydraulic pressure obtained by raising on the basis of the distributed torque for the abnormal-time slipping element a hydraulic pressure matching distributed torque based on the input torque and a torque distribution ratio for the abnormal-time engagement element determined in advance in accordance with the shift speed wherein the abnormal-time engagement element and the abnormal-time slipping element are selected so as to establish a shift speed that is higher than the shift speed established through concurrent engagement of the two or more friction engagement elements.