Agile position controlling system and method based on air pressure balance control strategy of high speed on-off valve
A technology of high-speed switching valve and air pressure balance, which is applied in the direction of fluid pressure actuation system components, fluid pressure actuation devices, servo motors, etc., can solve the problems of control dead zone and low control precision, and achieve the reduction of control dead zone, Solve the effect of controlling large pulsation, avoiding waste of air source and noise
Active Publication Date: 2018-02-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0005] Purpose of the invention: In view of the above-mentioned existing problems and deficiencies, the purpose of the invention is to solve the problems of low control precision and control dead zone in the traditional PWM-controlled high-speed switch valve position control system
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[0018] The present invention will be further explained below in conjunction with the accompanying drawings.
[0019]The agile position control system based on the high-speed switching valve air pressure balance regulation strategy is inspired by the PWM method. In the traditional PWM control position control system, there is no correlation between the opening and closing movements of different valves, but the biggest difference between the new method adopted by the present invention and the PWM method lies in the reasonable planning and combination of various high-speed switching valves. The opening and closing time of the switch, and different control strategies are adopted for different position error segments, which greatly improves the control accuracy. At the same time, considering the limit position jamming problem in the traditional PWM control position control system, a control strategy to adapt to the air pressure balance is added, which stipulates that the internal a...
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The invention discloses an agile position controlling system and method based on an air pressure balance control strategy of a high speed on-off valve. A controller in the system detects the positionof a output rod of an air cylinder, and according to the size of the target position and according to the difference value relationship between the sum of the pressure of a left cavity and a right cavity of the single-lever double-action air cylinder and the sum of the pressure of a high pressure gas source and the atmosphere, the output rod of the air cylinder is made to move towards the right and the left by combining starting of an inflatable valve and an air exhaust valve, so that accurate and rapid control of the position of the output rod of the air cylinder is achieved; according to therelationship of the sum of the internal pressure and the external pressure, different control strategies are adopted, the strategy of air pressure balance and the strategy segmented according to position error are combined to form a complete high-precision control method; and the control pulsation is small, gas source waste and noise caused by frequent air inflating and exhausting when a PWM method is used are avoided, the control dead zone of the limit position is reduced, and the service life of the valve and the position control accuracy are greatly improved.
Description
technical field [0001] The invention belongs to the field of pneumatic servo control, in particular to an agile position control system based on a high-speed switching valve air pressure balance control strategy. Background technique [0002] Pneumatic servo control is a technology that uses compressed air as the working medium to transmit power and control signals, control and drive various machinery and equipment, and realize the mechanization and automation of the production process. Due to a series of advantages such as low cost of compressed air acquisition, no environmental pollution, low maintenance cost, low environmental requirements for system design, and long service life, pneumatic servo control technology is widely used in various industrial production processes. In the modern automobile welding production line, the movement of each process of the body, the rapid positioning of the body shell and the rapid approach of the welding torch all require precise pneuma...
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IPC IPC(8): F15B11/12F15B11/06F15B13/04F15B21/02
CPCF15B11/06F15B11/121F15B13/04F15B21/02F15B2211/7653
Inventor 林忠麟谢琦张天宏黄向华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS