| 摘要 |
PROBLEM TO BE SOLVED: To provide a protection control device for an automatic transmission capable of surely preventing an oil temperature in the automatic transmission from rising.SOLUTION: When a vehicle speed is a first vehicle speed or more and an oil temperature is a first oil temperature or more, a shift stage changing means performs forcible upshift from a present shift stage and thereby the number of input rotation to an automatic transmission is lowered by the upshift, so that the oil temperature can be prevented from rising. After the forcible upshift is performed, downshift is regulated by a shift regulation means, automatic transmission and an operation of a driver and thereby the number of input rotation to the automatic transmission is increased by the downshift, so that the oil temperature can be prevented from rising again. When the oil temperature reaches a second oil temperature higher than the first oil temperature and a maximum vehicle speed is second vehicle speed higher than the first vehicle speed or more, a maximum vehicle speed regulation means regulates the maximum vehicle speed to a third vehicle speed, and thereby the oil temperature can be prevented from rising by the regulation of the maximum vehicle speed even when the present shift stage is the maximum shift stage and lowering of the oil temperature is not desired by the forcible upshift. |
