# Equal Coded Digital Hydraulic Valve System – Improving Tracking Control with Pulse Frequency Modulation

> Research article (Procedia Engineering, 2015) · cited 16× · AI/ML

**Wikidata**: [openalex:W641443411](https://www.wikidata.org/wiki/openalex:W641443411)  
**Source**: https://4ort.xyz/entity/equal-coded-digital-hydraulic-valve-system-improving-tracking-control-with-pulse-frequency-modulation