| 摘要 |
PROBLEM TO BE SOLVED: To provide a shift controller of an automatic transmission, capable of adjusting an uncertain movement of a cut valve, and certainly shifting to a predetermined gear. SOLUTION: In the shift controller, as shown in Fig. 7, a group of shift control valves to control the oil pressure feeding into LOW to 5TH clutches is comprised of three linear solenoid valves 86 to 88, four shift valves 60, 62, 64 and 66, and two cut valves 90 and 92 to select an oil passage so as to selectively feed line pressure PL or shift control oil pressure to the clutches, and three on/off solenoid valves 81 to 84 to control the operation of the shift valves. The gear is set by controlling the operation of the shift valved with the on/off solenoid valved. In each of the operating state and set state of the cut valves, the same on/off operation combination of the on/off solenoid valves is set to select a different gear. In shifting to LOW stationary control, LOW is output in a fixed period with the maximum value, so that two cut valves are shifted to the LOW side. COPYRIGHT: (C)2007,JPO&INPIT |
