| 摘要 |
Motor-driven tractor vehicle with an automatic clutch and gearbox between the engine and the vehicle drive wheels, and with means (6, 8; 20) which, after the vehicle has been stopped, can identify whether a load carrier (2, 11) has been attached or detached. The gearbox and the clutch are controlled by an electronic control unit (19) on the basis of a set position of a manual gear selector. The control unit is arranged, with the gear selector in the position for automatic shifting, to select, at starting off, a starting-off gear, which is determined by a first gear selection strategy stored in the control unit on the basis of information stored in the control unit on rig weight, road grade, rolling resistance, etc. The control unit is disposed at start, at least after the indication that a load carrier has been decoupled, to select the starting-off gear in accordance with a second gear selection strategy. In this case the gear selection in accordance with the second gear selection strategy involves a selection of a starting-off gear of higher ratio than the gear selection in accordance with the first gear selection strategy. |
