| 摘要 |
PROBLEM TO BE SOLVED: To appropriately prevent the generation of vibration in a vehicle body due to an engagement shock and after shock thereof when a shifting clutch of a next shift position is engaged during down-shifting by kickdown of an automatic transmission.SOLUTION: A shift vibration generated in a vehicle body is defined by a product ΔG×T between a maximum excess amount ΔG of an actual foot axis torque to a theoretical foot axis and convergence time T; an average value (ΔG×T)ave3 of the ΔG×T is calculated; when the average value (ΔG×T)ave3 deviates from a predetermined range for a target value DGTTRG, a slip ratio correction amount of a torque converter is set to a value (ΔG×T)ave3×KDGT obtained by multiplying the average value (ΔG×T)ave3 of the ΔG×T by a correction coefficient KDGT; and a target slip ratio ETRT of the torque converter in a torque phase during next kickdown of the same degree is set to a value obtained by subtracting the slip ratio correction amount (ΔG×T)ave3×KDGT from a previous target slip ratio ETRT.SELECTED DRAWING: Figure 7 |
