Modeling and self-tuning pressure regulator design for pneumatic-pressure–load systems

Wang, Xuesong; Cheng, Yuhu; Peng, Guangzheng

doi:10.1016/j.conengprac.2007.02.001

Cited by 35 publications

(21 citation statements)

References 16 publications

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“…No air leakages, constant supply pressure and measurement of actuator position to estimate acceleration was assumed. A self-tuning LQG pressure regulator for a pneumatic pressure load systems is presented in Wang et al (2007). Compared to the control strategy in Wang et al (1999), the requirement of acceleration feedback is removed.…”

Section: Related Research and Contributionsmentioning

confidence: 99%

Modeling and control of actuators and co-surge in turbocharged engines

Thomasson¹

2014

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Paper 1 is reproduced here with permission from IFP Energies nouvelles Paper 2 is reproduced here with permission from IFAC Paper 3 is reproduced here with permission from Elsevier Paper 4 is reproduced here with permission from IFAC The cover: Photo of an electronic throttle, a pneumatic actuator, and a measurement of mass flows during co-surge, illustrating the main topics of the thesis. Typeset with L A T E X 2εPrinted by LiU-Tryck, Linköping, Sweden 2014 i AbstractThe torque response of the engine is important for the driving experience of a vehicle. In spark ignited engines, torque is proportional to the air flow into the cylinders. Controlling torque therefore implies controlling air flow. In modern turbocharged engines, the driver commands are interpreted by an electronic control unit that controls the engine through electromechanical and pneumatic actuators. Air flow to the intake manifold is controlled by an electronic throttle, and a wastegate controls the energy to the turbine, affecting boost pressure and air flow. These actuators and their dynamics affect the torque response and a lot of time is put into calibration of controllers for these actuators. By modeling and understanding the actuator behavior this dynamics can be compensated for, leaving a reduced control problem, which can shorten the calibration time.Electronic throttle servo control is the first problem studied. By constructing a control oriented model for the throttle servo and inverting that model, the resulting controller becomes two static compensators for friction and limp-home nonlinearities, together with a PD-controller. A gain-scheduled I-part is added for robustness to handle model errors. The sensitivity to model errors is studied and a method for tuning the controller is presented. The performance has been evaluated in simulation, in test vehicle, and in a throttle control benchmark.A model for a pneumatic wastegate actuator and solenoid control valve, used for boost pressure control, is presented. The actuator dynamics is shown to be important for the transient boost pressure response. The model is incorporated in a mean value engine model and shown to give accurate description of the transient response. A tuning method for the feedback (PID) part of a boost controller is proposed, based on step responses in wastegate control signal. Together with static feedforward the controller is shown to achieve the desired boost pressure response. Submodels for an advanced boost control system consisting of several vacuum actuators, solenoid valves, a vacuum tank and a vacuum pump are developed. The submodels and integrated system are evaluated on a two stage series sequential turbo system, and control with system voltage disturbance rejection is demonstrated on an engine in a test cell.Turbocharged V-type engines often have two parallel turbochargers, each powered by one bank of cylinders. When the two air paths are connected before the throttle an unwanted oscillation can occur. When the compressors operate close to the surge lin...

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Section: Related Research and Contributionsmentioning

confidence: 99%

Modeling and control of actuators and co-surge in turbocharged engines

Thomasson¹

2014

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“…These valves are usually used in different automation processes requiring continuous pressure control, for example tank pressure control, control of cylinder force, tension control, counterbalancing control, nozzle flow control, etc. (Wang et al, 2007). However, controlling the pressure in the cylinder chambers and achieving an external position feedback, these valves can also be used in realization of an electro-pneumatic servo-drive for positioning tasks (Hashimoto and Ishida, 2000;Sorli et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Control of a pneumatic drive using electronic pressure valves

Šitum

2013

Transactions of the Institute of Measurement and Control

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The primary task of the electronic pressure (E/P) valves is to control the pressure continuously in different industrial automation processes. Their use in pneumatic drives allows regulating pressures in both cylinder chambers and so it is possible to achieve a direct force controlled actuator. Additionally to the force control, position control of the pneumatic actuator using E/P valves has been presented. A dynamic model for control purposes of the process has been derived, followed by the PID controller tuned according to damping optimum criteria. The control algorithms have been experimentally verified on an industrial cylindrical rod-less actuator controlled by two E/P valves. The control performances are comparable with the set-up with proportional directional control valves (servo-valves). Based on the experimental results, it can be concluded that these valves have potential for successful implementation in industry for position and force control applications.

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“…The independent pressure control system generally consists of air supply, electro-pneumatic proportional valve, chamber and pressure sensor, for example, constant pressure system [14], pneumatic-pressure-load system [15] and pneumatic pressure signal generator [16]. Lu et al [14] presented a constant pressure control system that consisted of frictionless cylinders, a large tank and a pneumatic proportional pressure valve.…”

Section: Introductionmentioning

confidence: 99%

“…The pneumatic-pressure-load system researched in Ref. [15], applied to intensity testing devices, was constructed by electro-pneumatic proportional pressure valve. In order to adapt to the parameter variability of the pressure load system and obtain better dynamic and static performances, a linear quadratic Gaussian self-tuning pressure regulator was proposed to realize an adaptive control of pressure in the chamber.…”

Section: Introductionmentioning

confidence: 99%

“…The occurrence and development of electro-pneumatic proportional control valves place pneumatic control techniques beyond the limitation of point-to-point control. Electro-pneumatic proportional control valves provide the necessary components for pneumatic servo control systems, such as position [5][6][7][8][9], speed [10], force [11,12], and pressure [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Asymmetric Fuzzy Control of a Positive and Negative Pneumatic Pressure Servo System

Yang

et al. 2017

Chin. J. Mech. Eng.

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The pneumatic pressure control systems have been used in some fields. However, the researches on pneumatic pressure control mainly focus on constant pressure regulation. Poor dynamic characteristics and strong nonlinearity of such systems limit its application in the field of pressure tracking control. In order to meet the demand of generating dynamic pressure signal in the application of the hardware-in-the-loop simulation of aerospace engineering, a positive and negative pneumatic pressure servo system is provided to implement dynamic adjustment of sealed chamber pressure. A mathematical model is established with simulation and experiment being implemented afterwards to discuss the characteristics of the system, which shows serious asymmetry in the process of charging and discharging. Based on the analysis of the system dynamics, a fuzzy proportional integral derivative (PID) controller with asymmetric fuzzy compensator is proposed. Different from conventional adjusting mechanisms employing the error and change in error of the controlled variable as input parameters, the current chamber pressure and charging or discharging state are chosen as inputs of the compensator, which improves adaptability. To verify the effectiveness and performance of the proposed controller, the comparison experiments tracking sinusoidal and square wave commands are conducted. Experimental results show that the proposed controller can obtain better dynamic performance and relatively consistent control performance across the scope of work (2-140 kPa). The research proposes a fuzzy control method to overcome asymmetry and enhance adaptability for the positive and negative pneumatic pressure servo system.

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Modeling and self-tuning pressure regulator design for pneumatic-pressure–load systems

Cited by 35 publications

References 16 publications

Modeling and control of actuators and co-surge in turbocharged engines

Modeling and control of actuators and co-surge in turbocharged engines

Control of a pneumatic drive using electronic pressure valves

Asymmetric Fuzzy Control of a Positive and Negative Pneumatic Pressure Servo System

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