| 摘要 |
An instantaneous revolution speed Nm of an input shaft is calculated from an input period of a pulse signal from a revolution sensor, a revolution speed Nf is calculated by filter processing the instantaneous revolution speed Nm, a determination is made that a belt slip occurs when, during a stop of a vehicle, a state in which the revolution speed Nf is equal to or higher than a slip determination speed N SL is continued for a time equal to or longer than slip determination time T SL , and an immediately prior revolution speed Nf is held until a time of a pulse signal no input exceeds a road wheel lock corresponding time T WL which is longer than a slip determination time T SL . If the instantaneous revolution speed Nm is in a zone between a first reference speed N S1 and a second reference speed N S2 within a reference time T S1 from a time at which the signal no input is an input state, the instantaneous revolution speed gives promptly 0 due to a generation of the pulse signal no input. If the instantaneous revolution speed Nm is in a zone equal to or higher than a second reference speed N S2 , a value of immediately prior revolution speed Nf is held. Thus, erroneous determinations of a line breakage of an input revolution sensor of a belt type continuous variable transmission connected to a power plant via a clutch and a belt slip can be avoided. |
