| 摘要 |
Anti-creep apparatus controls, via valve 13, hydraulic pressure Pc to forward clutch 12 and maintains the pressure Pc at a present level or increases it by a predetermined amount (see * capital Greek delta *P, fig 2) when a relative rotation of the clutch 12 is detected. Control unit 15 decides when a relative rotation of the clutch 12 is generated by comparing turbine rotational speed Nt, detected by sensor 166, with a predetermined value (Ntset, fig 2). If the rotational speed Nt is greater than the predetermined value, ie relative rotation has taken place, and a flag is 1 (F=1, fig 2), then the pressure Pc is incremented by the predetermined amount (* capital Greek delta *P, fig 2) and this incremented pressure is set as a lower limit value(Plim=Pc, fig 2). In the next control cycle, if the flag is greater than 1, the control unit 15 decides if a rotational speed difference (Ns, fig 2) between an engine and the turbine, ie Ne-Nt), is smaller than another predetermined value (Nfbset, fig 2) or not. If it is not then the lower limit value (Plim, fig 2) is set as the present pressure Pc (Pc=Plim, fig 2). On the other hand, if rotational speed difference is greater the control 15 executes a feedback control so as to correspond the rotation speed difference (Ns, fig 2) with that of a target rotational speed difference (Nstgt, fig 2). The control unit then determines command hydraulic pressure Pc by means of an equation. |
