| 摘要 |
<p>A work vehicle such as an agricultural tractor includes means for the operator to select between manual or automatic engine speed control and to select among multiple automatic modes each having a different amount by which the engine speed is reduced when the load is reduced and the transmission is up-shifted to maintain the vehicle ground speed. This enables the operator to match the degree of engine speed reduction to the particular task at hand for improved performance and productivity. Preferably, the transmission is an infinitely variable transmission whereby the engine speed and the transmission can both be varied infinitely.</p> |
