| 摘要 |
PURPOSE:To apply load to all clutches to prevent the life of a particular clutch from being shortened by controlling the modulation waveform of oil pressure to a transmission clutch using the change rate of the rotating speed ratio upon speed changes. CONSTITUTION:The numbers of revolutions of an input shaft 31, an intermediate shaft 35, and an output shaft 39 are N1, N2, and N3, respectively. The reduction gear ratios of a Hi.Lo side speed reducer 33 before and after a speed change are rho1, rho1i and the reduction gear ratios of a speed side speed reducer 37 before and after a speed change are rho2, rho2i. When control operation starts, a control computer 46 calculates the rotating speed change rate of the Hi.Lo side alpha and the rotating speed change rate of the speed side beta. If the change is rapid, modulating valves 44, 45 are used to reduce the oil pressure gradient of a clutch cylinder and if the change is slow, the oil pressure gradient is increased. When the oil pressure in the clutch cylinder reaches the instructed value, a speed change completes. This constitution allows the life of clutches to be longer. |
