Multi-Input Observer for Estimation of Compressor Flow

2013 ◽  
Author(s):  
Uroš Kalabić ◽  
Ilya Kolmanovsky ◽  
Julia Buckland
Keyword(s):  
Air Flow ◽  
High Gain ◽  
Experimental Results ◽  
Flow Sensor ◽  
Pressure Measurements ◽  
Gasoline Engines ◽  
Cylinder Flow ◽  
Reference Governor

This paper presents a formulation and an application of a high-gain multi-input observer to estimate the compressor flow in turbocharged gasoline engines. Such an observer is desired in vehicles lacking a mass air flow sensor yet in which compressor flow needs to be known; for instance, it is desired in order to apply a reference governor for surge constraint avoidance. In this application, a fast estimate of the compressor flow is required so that the reference governor can take action before the compressor goes into surge. The multi-input observer uses pressure measurements and cylinder flow to estimate the compressor flow. This paper presents the derivation of the observer and both simulation and experimental results showing its feasibility in estimating the compressor flow.

Computer Simulation of Turbocharged Aftercooled Gasoline Engine

2006 ◽  
Author(s):  
Shahabaddin Kharazmi ◽  
Ali Hajilouy-Benisi ◽  
Ali Asghar Mozafari
Keyword(s):  
Computer Simulation ◽  
Diesel Engines ◽  
Equivalence Ratio ◽  
Gasoline Engine ◽  
Air Flow ◽  
Computer Code ◽  
Experimental Results ◽  
Combustion Model ◽  
Gasoline Engines ◽  
Performance Curves

Turbocharging of gasoline engines has been improved less than diesel engines due to some difficulties, especially knock phenomena. They require wider air flow range and faster response too. A computer code is developed to simulate turbocharged gasoline engine behavior. A three zone combustion model is employed. Different performance curves at speed and equivalence ratio ranges are prepared. By this code naturally aspirated and turbocharged behavior are compared. A turbocharged aftercooled engine has been studied in various cases to complete the investigation. Some aftercooler effects are described experimentally. Modeling and experimental results are compared providing valuable achievements.

scholarly journals Contaminated Ventilator Air Flow Sensor Linked toBacillus cereusColonization of Newborns

2013 ◽  
Vol 19 (5) ◽  
pp. 781-783 ◽  
Author(s):  
George Turabelidze ◽  
Jay E. Gee ◽  
Alex R. Hoffmaster ◽  
Farrin Manian ◽  
Cindy Butler ◽  
...  
Keyword(s):  
Air Flow ◽  
Flow Sensor

Average Modeling and Nonlinear Observer Design For Pneumatic Actuators With On/Off Solenoid Valves

2021 ◽  
Author(s):  
Khaled Laib ◽  
Minh Tu Pham ◽  
Xuefang LIN-SHI ◽  
Redha Meghnous
Keyword(s):  
Closed Loop ◽  
Sliding Mode ◽  
High Gain ◽  
Observer Design ◽  
Nonlinear Observer ◽  
State Model ◽  
Pressure Measurements ◽  
Pneumatic Actuators ◽  
Nonlinear Observers ◽  
Piston Position

Abstract This paper presents an averaged state model and the design of nonlinear observers for an on/off pneumatic actuator. The actuator is composed of two chambers and four on/off solenoid valves. The elaborated averaged state model has the advantage of using only one continuous input instead of four binary inputs. Based on this new model, a high gain observer and a sliding mode observer are designed using the piston position and the pressure measurements in one of the chambers. Finally, their closed-loop performances are verified and compared on an experimental benchmark.

Preliminary Design of Variable Nozzle Turbines Based on Sensitive Parameters

2020 ◽  
Author(s):  
Sebastian Wittwer ◽  
Ivo Sandor
Keyword(s):  
Engine Performance ◽  
Optimal Solution ◽  
Operating Conditions ◽  
Experimental Results ◽  
Preliminary Design ◽  
Component Level ◽  
Gasoline Engines ◽  
Functional Parameters ◽  
Predictive Quality ◽  
Recent Developments

Abstract Recent developments in turbocharged gasoline engines have established new requirements for the turbine. A simple approach of scaling or optimizing existing turbines on component level might not be sufficient in terms of finding an optimal solution according to the multi-point, multi-disciplinary layout target. In the following paper nondimensional functional parameters are derived from turbomachinery analytics and rated on corresponding values of existing turbine stages. The influence of different parameters on aerodynamic performance is discussed based on CFD results and arranged according to their sensitivity for different engine relevant operating conditions. A metamodel for the preliminary design of variable nozzle turbine stages is derived from DoE (Design of Experiments) based CFD results. It is evaluated regarding its predictive quality on several exemplary turbine stages. Both, CFD and experimental results are therefore used while the experimental results are made up of hot gas stand measurements as well as measurements on engine test bench. Thus, not only the influence of functional parameters can be verified on turbine efficiency characteristics, but beyond that also the predictive quality of engine performance can be assessed.

Implementing air flow sensor in a medical mask for breathing detection

2019 ◽  
Vol 10 (2) ◽  
pp. 405-410 ◽  
Author(s):  
Domingo Rangel ◽  
David Daniel Castelán Castillo
Keyword(s):  
Air Flow ◽  
Flow Sensor

An air flow sensor based on interface thermal wave propagation

1986 ◽  
Vol 59 (1) ◽  
pp. 59-65 ◽  
Author(s):  
David K. Lambert ◽  
Charles R. Harrington
Keyword(s):  
Wave Propagation ◽  
Thermal Wave ◽  
Air Flow ◽  
Flow Sensor
Sign in / Sign up

Export Citation Format

Share Document