| 摘要 |
<p>PURPOSE:To provide always smooth seed change under various traveling requirements by providing a control means for varying the time dependent pattern of electric command according to respective outputs of a vehicle detecting means, throttle opening detecting means, speed change interval measuring means and speed change stage discriminating means in the speed change. CONSTITUTION:A controller 70 detects vehicle speed v from the output of an output shaft rotation sensor 65 to judge the load condition (whether the vehicle is in hill climbing, digging operation or traveling on a flat ground) from the vehicle speed v and a throttle opening signal TH. Also, an speed change interval is judged by an internal timer so that the condition of oil remaining in clutches F, R, 1-4 is judged from the speed change interval and the vehicle speed v. Further, the speed change stage (speed change from what speed stage to what speed) is judged from a lever position signal SH or the like. The controller 70 varies properly command signals C1-C6 applied to respective pressure controlling valves 51-56 according to said judging results to give any oil pressure patterns to respective clutches F, R, 1-4.</p> |
