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Kang J.,Institute of SANY Heavy Machine | Shang S.,Institute of SANY Heavy Machine | Jiao W.,Institute of SANY Heavy Machine | Wang X.,Institute of SANY Heavy Machine | And 4 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

In applications of excavator or other industrial machines, proportional electromagnetic valve was usually driven by PWM signals of embedded control system. However, due to pulse output characteristics of electromagnet, the performance of proportional electromagnetic valve was limited, even impacted stability of the system. A frequency-varying method of PWM driving was proposed. According to different duty ratio of PWM, the embedded control system output PWM with different frequencies. Through this method, the output oil pressure of proportional electromagnetic valve maintains within a determinated range, the valve-core's zero-average oscillations is reserved and power consumption of proportional electromagnetic valve is relatively low. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved.

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