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Copyright of Journal of Mechanical & Electrical Engineering is the property of Mechanical & Electrical Engineering Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mechanical & Electrical Engineering is the property of Mechanical & Electrical Engineering Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mechanical & Electrical Engineering is the property of Mechanical & Electrical Engineering Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Aiming at the development status of the amplifier for proportional valve and the control requirement of proportional directional valve, the control principle of digital amplifier for proportional directional valve(DAPDV) was analyzed and the system model of proportional directional valve was established. After the theoretical analysis, a DAPDV based on ARM7 micro-controller and the technology of the inverse-relief power driver circuit was implemented. With the aid of Visual C++ and ADS1.2 integrated development environment, the software system of the proportional amplifier was developed. The human-machine interface of host computer was designed, and the program control and close loop control of the proportional valve was realized. After determining the PID parameters of the proportional amplifier, the step response and sine wave signal response of the proportional directional valve system were tested on the electra-hydraulic proportional experiment rig. The results indicate that the system setting time for step response is short, the frequency response bandwidth is enough, and the designed proportional amplifier has good stability and dynamic performance. [ABSTRACT FROM AUTHOR]