| 摘要 |
PCT No. PCT/EP92/01586 Sec. 371 Date Mar. 17, 1994 Sec. 102(e) Date Mar. 17, 1994 PCT Filed Jul. 13, 1992 PCT Pub. No. WO93/02253 PCT Pub. Date Feb. 4, 1993.A method of determining and displaying during operation an actual degree of soil compaction achieved with a soil compacting device includes the steps of driving the soil compaction device with a motor and compacting the soil with the soil compacting device. The motor is secured against surpassing a predetermined maximum rpm limit by providing a protective rpm limiting circuit. The ignition impulse is delayed with the protective rpm limiting circuit, when the predetermined maximum rpm limit is surpassed. Within a time interval the average of the delay of the ignition impulse is determined as a base value for a display value of the actual degree of compaction. For a large surface area to be compacted it is possible to compact the soil within a test portion to the desired degree of compaction and save the corresponding display value as a reference value to be used during compaction of the remaining portions.
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