A practical control strategy for servo-pneumatic actuator systems

Wang, Jihong; Pu, Junsheng; Moore, Philip

doi:10.1016/s0967-0661(99)00115-x

Cited by 149 publications

(85 citation statements)

References 8 publications

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“…PID control and position feedforward is then applied. In Wang et al (1999) acceleration feedback, PID control and a nonlinear compensator is used to track a velocity reference. Approximate feedback linearization is proposed in Xiang and Wikander (2004) to provide accurate position control.…”

Section: Modeling and Control Of Pneumatic Actuatorsmentioning

confidence: 99%

“…Force control of pneumatic cylinders are considered in Richer and Hurmuzulu (1999), where a nonlinear sliding mode controller is designed. The closely related pressure control problem is studied in Wang et al (1999), where an LQG self-tuning controller is proposed.…”

Section: Modeling and Control Of Pneumatic Actuatorsmentioning

confidence: 99%

“…A control strategy for a pneumatic system, based on using actuator acceleration feedback is presented in Wang et al (1999). No air leakages, constant supply pressure and measurement of actuator position to estimate acceleration was assumed.…”

Section: Related Research and Contributionsmentioning

confidence: 99%

“…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. The valve flow is modeled with valve position dependent effective flow areas, and the actuator is modeled using an emptying and filling approach.…”

Section: Related Research and Contributionsmentioning

confidence: 99%

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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: Modeling and Control Of Pneumatic Actuatorsmentioning

confidence: 99%

Section: Modeling and Control Of Pneumatic Actuatorsmentioning

confidence: 99%

Section: Related Research and Contributionsmentioning

confidence: 99%

Section: Related Research and Contributionsmentioning

confidence: 99%

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

Thomasson¹

2014

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“…Pneumatic actuators have the advantages of low cost, high power-to-weight ratio, ease of maintenance, cleanliness, power source being readily available and cheap [10]. The compressibility of air results in very low stiffness (compared with the hydraulic system) leading to low natural frequency.…”

Section: Introductionmentioning

confidence: 99%

Vibration control of a pneumatic driven piezoelectric flexible manipulator using self-organizing map based multiple models

Zhao

Qiu

Zhang

et al. 2016

Mechanical Systems and Signal Processing

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A cascade control approach to active suspension using pneumatic actuators

Feng

Wang

2019

Asian Journal of Control

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Operators of forest machinery suffer from intensive whole body vibrations, which are big threats to their health. Therefore, it is important to investigate effective seat undercarriages and control methods for vibration reduction. This paper addresses the control problem of a novel seat undercarriage with pneumatic actuators customized for forest machinery. A two-layer cascade control structure is developed, where the top layer consists of a group of proportional controllers to regulate the position of pneumatic actuators and the bottom layer is a sliding mode controller for force and stiffness tracking. The advantage of the sliding mode control is to achieve robust control performance with coarse system models. The paper demonstrates that the proposed control structure is better than a traditional PID controller. The robust stability of the sliding mode controller is proved by the Lyapunov's method. Experiments show its capability of reducing at least 20% amplitude of seat vibrations from 0.5 to 1 Hz.

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A practical control strategy for servo-pneumatic actuator systems

Cited by 149 publications

References 8 publications

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

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

Vibration control of a pneumatic driven piezoelectric flexible manipulator using self-organizing map based multiple models

A cascade control approach to active suspension using pneumatic actuators

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