| 摘要 |
PCT No. PCT/EP87/00220 Sec. 371 Date Oct. 26, 1988 Sec. 102(e) Date Oct. 26, 1988 PCT Filed Apr. 23, 1987 PCT Pub. No. WO87/06670 PCT Pub. Date Nov. 5, 1987.Electric-hydraulic control for an automatic transmission (1) with a selecting slide (4), at least for the neutral position (N), as well as the forward drive position (D) and the reverse drive position (R), an electronic control device (5), which is connected to at least one sensor (55) for detecting the gear output speed, with solenoid valves (6, 65) held in neutral position by spring force, a pressure-medium source (7), pressure-control valves (8) and switch valves (9) and dampers for the actuation of gear-selecting clutches and -brakes (A-E) as well as with a R-gear safety mechanism which is created by the cooperation of a solenoid valve (6) and a switch valve (9), both of them being already used in other gear-selecting operations. The solenoid valve (6) is either immediately switched by moving the selecting slide (4) into the R-gear when the speed of the forward motion reaches or falls below a definite value, or the switching is interrupted until the speed of forward motion reaches or falls below the definite value. The electronic control device ( 5) switches off the solenoid valve (6), whereby the R-gear coupling B and -brake (D) are activated by the operational pressure via the switching valve (9). |
