Abstract
In this paper, an adaptive header height control system is designed. Through the influence of the natural frequency, ωn, and damping ratio, ζ, on the system’s dynamic index, the optimal hydraulic cylinder parameters are determined comprehensively. The ground profiling monitoring mechanism and the header height feedback mechanism based on the angle sensor are designed. An integrated electromagnetic proportional valve was installed to replace the original header-controlled, electronically-controlled reversing valve, and a PWM (pulse width modulation) control-simulated counterweight test was performed. The limitation of traditional PID facing the integral saturation state is analysed, and a new EVPIVS-PID algorithm is proposed and simulated. Through the analysis of multiple groups of sample data in the field test, the accuracy of the control system in the header height control and output PWM value is demonstrated. The effectiveness of the EVPIVS-PID control algorithm to change the corresponding PID parameters based on the monitoring operation speed is analysed and demonstrated. Experiments show that the adaptive control system of header height based on ground profiling has a stable control effect. The height error of cutting stubble is not more than 2 cm, which can meet the requirements of a 5–11 km/h harvesting speed in plain areas.
Highlights
In grain harvesting operations, 75% of the harvest losses are caused by improper height adjustment of the cutting table [1,2,3]
If the harvester header is too high, the stubble height will increase, which will aggravate the loss of harvesting links [4,5], and even affect the subsequent seeding quality
A profiling roll and an angle sensor were installed at the bottom of the header to monitor the fluctuations of the ground and serve as a signal input device for the electro-hydraulic control system
Summary
75% of the harvest losses are caused by improper height adjustment of the cutting table [1,2,3]. If the harvester header is too high, the stubble height will increase, which will aggravate the loss of harvesting links [4,5], and even affect the subsequent seeding quality. With the increasing speed of grain combine harvesting operations, the way drivers manually adjust harvester parameters has been unable to meet the current harvester needs [6]. The adaptive control function of the header has been regarded as an effective method to reduce the harvest loss, reduce the driver’s work intensity, and avoid the damage of the header equipment [7]. In the 1970s, many foreign combine harvester companies began to develop automatic header control systems [8]. The Canadian company Syfogg used the magnetic suction sensing mechanism, relying on the control principle of the swing of the fan-shaped iron plate to attract the corresponding contacts, and to pull in the circuit to generate the action
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
