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The motion parameters of the conventional engine valve is fixed, but under different operating conditions , the requirements of the engine valve is different, and the fixed valve parameter is a compromise for these requirements . For the engine to get lower emissions, lower power , higher torque and power output performance , heavily based on the camshaft variable valve internal combustion engine is proposed , in recent years, have embarked on a camless valve mechanism the valve motion parameters can be adjusted continuously research . According to Research engine cam valve train of the electro-hydraulic drive , No cam electro-hydraulic drive valve train design and experimental studies carried out on the basis of the 156FMI engine . 1 In this paper, on the basis of the basic principles of the No cam electro-hydraulic drive gas distribution agencies , according to the existing institutions of the hydraulic drive with gas analysis , test , to design a hydraulic piston , valve sleeve combination valve train key group pieces , and the supporting parts of the trial with one-way valve , solenoid valve , hydraulic pump station . Newton's second law and the pressure dynamics in combination on this basis to establish a mathematical model of the single valve system , the single valve system dynamics calculations . Paper according to the law of motion of cam electro-hydraulic drive gas distribution agencies , design the open-loop controller camless electro-hydraulic drive with gas agencies able to operate according to a predetermined design . In this paper, the engine test on 156FMI no cam electro-hydraulic drive with gas operation and commissioning work . Summarizes the electro-hydraulic drive gas distribution mechanism by artificial input signal (i.e. , engine speed) , the open-loop control , the detection analysis of different high and low voltage , different speed valve lift law , turn on the relationship between the factors such as the duration, the volume of the cavity , the actual motion parameters and influencing factors . By analyzing the test results , no cam designed electro-hydraulic drive gas distribution agency to meet the purpose of the initial design . Laid a good foundation for further cam - free electro-hydraulic drive with gas agencies .
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