| 摘要 |
PROBLEM TO BE SOLVED: To provide a failure determination device for a transmission that can reduce time from the occurrence of transmission failure to failure determination in comparison with a conventional device and can improve accuracy in the failure determination.SOLUTION: A failure determination device for a transmission includes a transmission for shifting a rotational force input from an input shaft and outputting the rotational force to an output shaft, and determines a transmission failure based on failure determination conditions. The failure determination conditions include a first failure determination condition that determines whether actual transmission ration is higher than Pwith respect to a target transmission ratio, a second failure determination condition that determines whether a change ratio of the actual transmission ratio is higher than P, a third failure determination condition that determines whether a change ratio in a difference between the actual transmission ratio and the target transmission ratio is higher than Pand a fourth failure determination condition that determines whether a change ratio in a rotation speed of the output shaft is smaller that P, wherein when each of the failure determination conditions are all met, the transmission failure is determined. |
