Shifting control for synchromesh-type transmission

摘要

In a shifting device which changes the gear ratio of a synchromesh-type transmission by using an electrically operated or controlled actuator, the actuator is controlled to stabilise or equalise the time durations required for effecting respective synchronisations. A driving signal for each of the synchronisation controls is decided in accordance with a relationship between the driving signal to be applied to the actuator and the relative rotation number between an idle gear and a sleeve when the synchronisation control is initiated. Prior to each synchronisation control, the above relation is corrected based on four variables obtained at the immediately preceding synchronisation control. These four variables are: (i) an input rotation number deviation summation £”N in ; (ii) a synchronisation time duration deviation T syn ; (iii) an elapse-time input rotation number deviation ”N in P ; and (iv) a change grade deviation ”dN in .