scholarly journals An Entropy-Based Propagation Speed Estimation Method for Near-Field Subsurface Radar Imaging

2010 ◽  
Vol 2010 (1) ◽  
Author(s):  
Daniel Flores-Tapia ◽  
Stephen Pistorius
2011 ◽  
Vol 176 (3) ◽  
pp. 59-68
Author(s):  
Koichi Nishibata ◽  
Muneaki Ishida ◽  
Shinji Doki ◽  
Takashi Masuzawa ◽  
Masami Fujitsuna

2011 ◽  
Vol 130-134 ◽  
pp. 1361-1364
Author(s):  
Shou Qiang Chen ◽  
Fan Li ◽  
Yu Long

Based on stator-field-orientation control combining with both direct torque control (DTC) and rotor-field-orientation control a speed estimation scheme is presented in this paper. Two key problems are discussed in detail. First is to use phase operation to decide stator-field-orientation angle θs and then the discrete-tracking-differential (DTD) technique is employed to high quality stator current. The experiments show that accurate speed estimation can be obtained by the method.


2020 ◽  
Vol 35 (8) ◽  
pp. 8429-8442 ◽  
Author(s):  
Chao Du ◽  
Zhonggang Yin ◽  
Jing Liu ◽  
Yanqing Zhang ◽  
Xiangdong Sun

Author(s):  
Jinli Wang ◽  
Fuyuan Yang ◽  
Minggao Ouyang ◽  
Ying Huang

Cylinder pressure based combustion state control is a direction that has drawn much attention in the field of internal combustion engine control, especially in the field of diesel HCCI (Homogeneous Charge Compression Ignition) research. In-cylinder pressure sensors have the potential to diagnose or even replace many traditional sensors, including camshaft and crankshaft sensors. This paper did research on engine synchronization method based on in-cylinder pressure signal. The research was based on a 4-cylinder high pressure common rail diesel engine equipped with 4 PSG (Pressure Sensor Glow Plug) type piezo-resistance cylinder pressure sensors, intended for HCCI research. Through theoretical analysis and experimental proof, methods and models for cylinder identification, engine phase estimation and engine speed estimation are given and further verified by experiments. Results show that cylinder pressure sensor could be used to identify cylinder instead of cam shaft sensor. The models for engine phase and speed estimation have been proved to have precision of 3° crank angle and 4.6rpm, respectively. The precision of engine phase and speed estimation provides a possibility for the engine to run if the crankshaft sensor fails, but more researches have to be carried out with respect to crankshaft sensor replacement.


Sign in / Sign up

Export Citation Format

Share Document