| 摘要 |
<p>A four-wheel-drive vehicle having an auxiliary transmission is provided with a low range gear estimating map used when the auxiliary transmission is in a low range, and a high range gear estimating map used when the auxiliary transmission is in a high range. When an NV ratio (i.e., a ratio of the engine speed to the vehicle speed) while the vehicle is taking off is within a range of NV ratios unique to the low range that are established only with the low range gear estimating map, it is determined that the auxiliary transmission is in the low range, and when that NV ratio is outside of this range of NV ratios unique to the low range, it is determined that the auxiliary transmission is in the high range. The current gear of the main transmission is determined based on this and the result is used in shift instructing control. Accordingly, the range position of the auxiliary transmission can be accurately identified without requiring a switch or the like for determining the range of the auxiliary transmission.</p> |
