Proportional Pressure Valve Research Articles

CLUTCH-TO-CLUTCH SHIFT CONTROL OF AN AUTOMATIC TRANSMISSION WITH PROPORTIONAL PRESSURE CONTROL VALUES

For a new kind of automatic transmissions using proportional pressure valves to control the clutches directly, a two-degree-of-freedom controller is designed for clutch slip control during the inertia phase of the shift process. The controller is designed based on a low order linear model which is derived from dynamics of the proportional pressure control valve and the vehicle drive line. The feedback gain is calculated by robust pole assignment methods while the feed-forward compensator aims to improve system response. Finally, the designed controller is tested on an AMESim powertrain simulation model. Simulation results show that the rotational speed difference of clutch can track the desired trajectory well, and shift shock can be reduced by designing suitable feed-forward compensator.

Testing device with opened hydrostatic circuit for dynamic loading of the tractor engine by power take off shaft

The developed loading device with opened hydrostatic circuit for measurement of speed and dynamic characteristics of the tractor engine by power take off is presented. This loading device may also be used as a portable type for field measurement. At present for development of these loading devices controlled hydrogenerators and electro-hydraulic proportional pressure valves directed by computer may by used to adjust geometrical volume of the hydrogenerator from zero to maximum value. There is a possibility to built these devices which consist of one hydrogenerator and one by-pass valve for the maximum power of internal combustion engine 420 kW which is sufficient from the point of view of practical need. Thus optional loading regime may be used according to the tractor engine horsepower to achieve the required accuracy of measurement.

Dynamic Model and Experimental Investigation of a Pneumatic Proportional Pressure Valve

A nonlinear dynamic model of a Honeywell Lucifer-type EPP3 J-21-U-100-10 (now Parker P3P-R) pneumatic proportional pressure valve is formulated by modeling the valve's main internal mechatronic devices in order to simulate its dynamic behavior in the time and frequency domains, for several operating conditions and different downstream loads. Mechatronic design and functionality of this valve are carefully analyzed by considering the conditions of its internal devices for each of the three standard working configurations of a three-way proportional valve. The main physical parameters introduced in formulating the dynamic model were identified by means of an experimental investigation. Finally, the experimental and simulated diagrams in the time and frequency domains are compared in order to validate the proposed model, which can be used as a general approach for modeling any pneumatic proportional pressure valve featuring a similar mechatronic design and internal structure.

Design Analysis of a Pneumatic Force Control Servosystem with Pressure Proportional Valve

We study static and dynamic performance of a force control pneumatic servosystem formed by a linear cylinder supplied by a pressure-proportional valve with a force closed-loop. Nonlinear and linearized models are presented to define design strategies, i.e., components satisfying imposed technical specifications. Through parametric analysis, we point out the effects due to circuit size and pressure-proportional valve bandwidth on overall system performance.

Optimal control of an active suspension system employing high speed ON/OFF solenoid valve

Previous studies have confirmed that an active suspension system with high speed ON/OFF solenoid valves could provide the same vibration isolation efficiency as that of system with pressure proportional valve. In this study, by using Linear—quadratic optimization technique and Kalman filter method, an optimal regulator controller with a state observer was designed for the proposed system. Simulation and experimental research was conducted on a quarter car model. The simulation analysis of the system frequency characteristic suggested that the peak value of magnitude response curve in the case of system with an optimal controller would be lowered significantly, and the experiment results also showed that an improvement in the vibration isolation effect was obtained in using the designed optimal controller over the sky hook damper controller.

A study on pressure control of a chamber by using an electro-pneumatic pressure proportional valve

We tried to control pressure of a chamber at some constant uniform pressure by using the electro-pneumatic pressure proportional valve.If compressed air of the chamber which is closed, is bled by disturbance, or if compressed air of the chamber which is open, is closed by disturbance, both cases we can control it at some constant uniform pressure by using method of feedback control system and learning control.Next we provide several step inputs of pressure to the chamber. Fluctuation of pressure servo can be made smaller and faster by control based on hysteresis of the elctro-pneumatic pressure proportional valve.

Electropneumatic clutch servomechanism and its fuzzy control for automated manual transmission

This paper describes an application of electropneumatically operated servomechanism with fuzzy control intelligence to the sophisticated control of clutch engagement for an automated manual transmission. The servomechanism is assembled with a three port pneumatic pressure proportional valve and a position sensed cylinder which controls arelease lever of 25mm stroke within the position preciseness of 0.1mm under a maximum spring load of 2kN. The fuzzy system estimates driver's will only from the accelerator pedal operation. The performance of the system is evaluated from the starting characteristics by using an oil hydraulically operated engine-vehicle simulating test rig with a maximum torque capacity of 400N·Em.

Characteristics of a pneumatic pressure proportional valve.

Characteristics of a pneumatic pressure proportional valve.

圧力比例弁による電気空気圧制御

The electropneumatic proportional valve controls the airflow rates or pressure in proportion to the electric current by using a proportional magnet. The uniqueness of the magnetic field of the proportional magnet makes it difficult to predict or reproduce its performance due to an incorrect estimation of magnetic flux's saturation and leakage. In this paper, the magnetic field of the proportional magnet is clarified by making the contour lines of flux and flux density with the aid of the FEM magnetic analysis. Next, a three-way type pressure proportional valve is developed, which enables the controlling of the pneumatic pressure in proportion to the electric current of 0.9 MPa/0.8 A within a 30 ms response time with the flow capacity of 1.33x10-2 kg/s at 0.49 MPaAbs. The pressure proportional valve is applied to the position control of servocylinder, which demonstrates that the pressure control strategy improves the fluctuation of dynamic characteristics because of the control of the penumatic compliance.