| 摘要 |
PCT No. PCT/SE88/00589 Sec. 371 Date Apr. 17, 1990 Sec. 102(e) Date Apr. 17, 1990 PCT Filed Nov. 1, 1988 PCT Pub. No. WO89/04432 PCT Pub. Date May 18, 1989.An electrohydraulic system for controlling the gear changing process in a mechanical, automatic gear-box having five gears. The system includes two pairs of electromagnetic valves (57, 58, and 59, 60) which control via pressure-control valves (61, 62) the flow of pressure medium to three operating cylinders (41, 42, 43). When activated individually, the electromagnetic valves control the engagement of the first, second, third and fourth gears. Simultaneous activation of the electromagnetic valves (58, 57) of the first and third gears will result in engagement of the fifth gear, whereas simultaneous activation of the electromagnetic valves (60, 59) of the second and fourth gears will result in engagement of the reverse gear.
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