| 摘要 |
The invention relates to a method and a device for signaling to a vehicle operator that a higher gear should be selected. A microprocessor (1) is connected so that it can sense the rotational speed of the engine (via 3) and the vehicle road speed (via 2). The quotient of the road speed and the engine speed is determined and is commpared with a series of predetermined quotients, one for each of the gear selector positions, and the engaged gear is thus determined. For each gear there is registered the quotient of its own gear ratio and that of the next higher gear position, the quotient being zero for the highest gear. The engine speed signal is multiplied by this gear ratio value for the gear engaged and is compared with a maximum value, and if the result exceeds the maximum value, a signal is sent to indicate that a gear change should be made. In accordance with a preferred embodiment, the fact is utilized that the generator, if the generator belts slips, will produce an engine speed value which is too low, so that the first mentioned measured quotient will not agree with the predetermined quotient. An error indication is then sent indicating the need for service. |
