| 摘要 |
The present invention generally provides a method of automatic control for a scraper bowl by measuring a first force as applied to the scraper bowl during forward movement of the scraper. Preferably, the first force is derived by measuring the hydraulic pressure within the hydraulic actuator that controls the scraper bowl. A target force value is then subtracted from the first force to obtain a force error signal which is converted into a position command signal. The position command signal is preferably used to automatically adjust the depth of cut performed by the scraper blade without diversion of the operator's attention. Additionally, the scraper blade can be further controlled by constraining the vertical adjustment speed signal of the cutting blade to prevent the cutting blade from digging to deep or breaking through the ground by providing an upper constraint limit and a lower constraint limit which can be set according to tractive effort and the material condition acting upon the scraper blade.
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