Control Method of Automatic Driving Proportional Electromagnetic Valve Based on Beidou

PWM modulation is one of the ways to control proportional solenoid valve.By using proportional electromagnetic valve to connect double PWM modulating module，the accuracy and stability of tractor in automatic driving process can be improved.The dual PWM modulation module uses dual PWM modulation to control proportional solenoid valves.Double PWM modulation means that in the 1 PWM cycle T，second modulations are added to reduce current ripple of proportional electromagnetic current，thus impact of proportional solenoid valve is smaller，which could effectively increase service life of proportional valves and increase control accuracy of proportional solenoid valves.