| 摘要 |
PCT No. PCT/SE85/00439 Sec. 371 Date Jul. 7, 1986 Sec. 102(e) Date Jul. 7, 1986 PCT Filed Nov. 6, 1985 PCT Pub. No. WO86/02975 PCT Pub. Date May 22, 1986.A device for setting the speed of, in particular, an excavator engine which is to operate at a speed adapted to the type of work to be done and is automatically shifted to resting speed when no work is done. In this manner, fuel consumption and the disturbing effect of unnecessarily high noise levels are reduced. The setting device includes simple electronic control units and actuates the fuel-controlling lever of the engine fuel injection unit. A d.c. servo motor is connected to said fuel-controlling level and is supplied with a reference value signal corresponding to the desired engine speed. By manual activation of a push-button on the control lever, the device provides the possibility of manually stepping the engine working speed upwards or downwards to at least three different levels. The device also includes a resting speed unit ("idling unit") having a preset high and preset low resting speed. If the manual control means of the machine are not activated for a given short period of time, the unit provides a high resting speed, and if no manual control means is activated for a further period of time, it provides a low resting speed. On activation of any manual control means, the engine resumes the actual working speed. |
