scholarly journals Review of Sensing Methodologies for Estimation of Combustion Metrics

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Libin Jia ◽  
Jeffrey D. Naber ◽  
Jason R. Blough
Keyword(s):  
Signal Processing ◽  
Closed Loop ◽  
Combustion Process ◽  
Signal Acquisition ◽  
Closed Loop Control ◽  
Cylinder Pressure ◽  
Response Signal ◽  
Loop Control ◽  
Processing Techniques ◽  
Signal Processing Techniques

For reduction of engine-out emissions and improvement of fuel economy, closed-loop control of the combustion process has been explored and documented by many researchers. In the closed-loop control, the engine control parameters are optimized according to the estimated instantaneous combustion metrics provided by the combustion sensing process. Combustion sensing process is primarily composed of two aspects: combustion response signal acquisition and response signal processing. As a number of different signals have been employed as the response signal and the signal processing techniques can be different, this paper did a review work concerning the two aspects: combustion response signals and signal processing techniques. In-cylinder pressure signal was not investigated as one of the response signals in this paper since it has been studied and documented in many publications and also due to its high cost and inconvenience in the application.

The Design of Monitoring System in Large Hydraulic Press Aiming at the Precise Closed-Loop Control

2014 ◽  
Vol 989-994 ◽  
pp. 3062-3069
Author(s):  
Heng Du ◽  
Bin Huang ◽  
Lin Wang ◽  
Shu Mei Chen
Keyword(s):  
Data Acquisition ◽  
Monitoring System ◽  
High Speed ◽  
Closed Loop ◽  
Hydraulic Press ◽  
Signal Acquisition ◽  
Closed Loop Control ◽  
Repeated Testing ◽  
Loop Control ◽  
The Status

In the research and development of the precise closed-loop control system in large hydraulic press, the touch screen and PLC are frequently applied to design, debug and test for the system. Though a better closed-loop control characteristic can be acquired after repeated testing by this way, the comprehensive state data of hydraulic press are unable to get, which leads to a long research cycle and also restricts the maintenance and upgrade with the equipment in the later period. In order to obtain the whole state information of hydraulic press easily and effectively, a monitor system of precise closed-loop control in large hydraulic press is designed. Based on reasonable cooperation of sensors and high-speed data-acquisition card, high-speed and precise signal acquisition is realized. In addition, data-acquisition software program is designed base on LabVIEW, it can achieve the functions of collecting, storing, displaying and analyzing data. Through the real measuring and analyzing on a certain large ceramic hydraulic press, the status of key parameters can be acquired effectively during the whole pressing process. So the monitoring system supplies the significant data basis to the precise closed-loop control, accelerates the design and development of high characteristic precise closed-loop control and also strongly supports to the maintenance and upgrade with the equipments in the later period.

Design of Parametric Loudspeaker and Receiver System

2014 ◽  
Vol 909 ◽  
pp. 222-227
Author(s):  
Zi Yu Chen ◽  
Xin Wei Zhang
Keyword(s):  
Signal Processing ◽  
Digital Signal ◽  
Signal Acquisition ◽  
Median Filtering ◽  
Receiver System ◽  
Audible Sound ◽  
Processing Techniques ◽  
Conventional Systems ◽  
Signal Processing Techniques ◽  
Mean Filtering

Parametric loudspeaker systems have been widely used for projecting highly directional audible sound to a specified area. However, the demodulated signal from parametric loudspeaker suffers from high distortion since the nonlinear interaction among primary waves also generate harmonics. In order to reduce distortion, signal acquisition and digital signal processing techniques can be applied at the receiver. In this paper, a parametric loudspeaker and receiver system is designed to reduce distortion using median filtering and mean filtering at the receiver. Compared to conventional systems, the demodulated signal using proposed techniques exhibits lower distortion.

Weak GNSS Signal Acquisition for Indoor Environments

2018 ◽  
pp. 485-514
Author(s):  
Seung-Hyun Kong
Keyword(s):  
Signal Processing ◽  
State Of The Art ◽  
High Sensitivity ◽  
Urban Canyon ◽  
Signal Acquisition ◽  
Indoor Environments ◽  
Weak Signals ◽  
Fast Acquisition ◽  
Processing Techniques ◽  
Signal Processing Techniques

High sensitivity and fast acquisition are two important goals that must be considered in the development of signal processing techniques for a GNSS acquisition function to meet the demands for LBS in GNSS-challenged environments, such as indoor and urban canyon. This chapter introduces the fundamentals of GNSS acquisition functions, GNSS acquisition techniques for new GNSS signals, and GNSS acquisition techniques achieving high sensitivity and fast acquisition. Therefore, this chapter contains useful information for engineers who study the fundamentals and principles of GNSS acquisition and the state-of-the-art GNSS signal acquisition techniques for weak signals.

scholarly journals Accommodation Closed-loop Control of Dieseline Fueled Flexible Fuel Engine Based on In-cylinder Pressure Sensor

2016 ◽  
Vol 49 (11) ◽  
pp. 202-209 ◽  
Author(s):  
Yaodong Hu ◽  
Tianyuan Zhou ◽  
Changsheng Yao ◽  
Fuyuan Yang ◽  
Jinli Wang ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Cylinder Pressure ◽  
Loop Control

Closed-Loop Control of Spark Advance and Air-Fuel Ratio in SI Engines Using Cylinder Pressure

2000 ◽  
Author(s):  
Paljoo Yoon ◽  
Seungbum Park ◽  
Myoungho Sunwoo ◽  
Inyong Ohm ◽  
K. J. Yoon
Keyword(s):  
Closed Loop ◽  
Closed Loop Control ◽  
Cylinder Pressure ◽  
Loop Control ◽  
Fuel Ratio ◽  
Si Engines

scholarly journals Integrated cylinder pressure measurement for gas engine control

2011 ◽  
Vol 146 (3) ◽  
pp. 16-23
Author(s):  
Stefan NEUMANN
Keyword(s):  
Pressure Measurement ◽  
Closed Loop ◽  
Pressure Sensors ◽  
Pressure Curve ◽  
Closed Loop Control ◽  
Engine Control ◽  
Cylinder Pressure ◽  
Loop Control ◽  
Gas Engine ◽  
Amount Of Information

Closed loop control based on cylinder pressure measurement has been investigated for over 20 years. The aim has been to improve combustion control and online engine diagnostics. However the price of cylinder pressure sensors and the high demands on processor capacity have been preventing the development. Lately however sensor technologies have improved and as a result costs have been reduced. The purpose of this work is to show the large amount of information that can be read out from the cylinder pressure curve and to evaluate a cylinder pressure based closed loop engine control.

Closed Loop Control of Spark Advance Using a Cylinder Pressure Sensor

1976 ◽  
Vol 98 (4) ◽  
pp. 414-420 ◽  
Author(s):  
M. Hubbard ◽  
P. D. Dobson ◽  
J. D. Powell
Keyword(s):  
Pressure Sensor ◽  
Environmental Conditions ◽  
Engine Speed ◽  
Closed Loop ◽  
Operating Regime ◽  
Control Technique ◽  
Closed Loop Control ◽  
Cylinder Pressure ◽  
Closed Loop System ◽  
Loop Control

The objective of the spark advance control technique discussed in this paper is to provide a schedule which is optimum in the presence of changing engine and environmental conditions. The paper shows the benefits of adaptable spark control, describes the ability of a cylinder pressure based system to adapt to optimum spark on a single cylinder laboratory engine and describes the transient performance of a controller mechanized in the laboratory. Averaged over the entire engine speed-load operating regime, the closed loop system yields average brake horsepower within 0.1 percent of optimum based solely on the cylinder pressure information. The system has demonstrated a transient settling time of 0.1 second.

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