| 摘要 |
PURPOSE:To maintain the normal power transmission state by installing a speed change ratio control means for once setting the speed change ratio of a speed change gear to zero and then returning the speed change ratio to a prescribed value again, on the basis of the abnormal operation detection signal supplied from an abnormal operation detecting means. CONSTITUTION:A speed change ratio calculating circuit 95 calculates the necessary speed change ratio delta, and a speed change gear driving circuit 96 is controlled according to the result of the calculation, and the operation of a driving motor 29 is controlled, and shift is performed so that the speed change ratio delta for the calculation of a speed change ring 11 is obtained. Then, a revolution speed calculating circuit 97 calculates the theoretical output revolution speed Noid of a speed change gear A on the basis of the number Nr of revolution and the number Ne of revolution of an engine. If, between the cooling operation output revolution speed No and the theoretical output revolution speed Noid, it is judged that No not equal to Noid, it is judged that abnormal slip (gross slip) is generated. When a comparison judging circuit 98 detects anomaly, the speed change ratio delta is once returned to zero and the regular speed change gear control is carried out again, and the abnormal operation for a long time is prevented, and also the abnormal abrasion due to the slippage in each contact paret of the speed change gear A is prevented. |
