Privious Issue

Volume 47 Number 2 (2016.6)

Special Feature

Analytic Technologies of Powertrain

Part I. Special Feature

2. Laser Diagnosis Using Optically Accessible Single Cylinder Engine(1,762kB)

pages 1-11
Kenji Fukui, Taketoshi Fujikawa, Mamoru Tohyama, Yoshiaki Hattori and Kazuhiro Akihama

A novel diagnostic technique termed the tracer-producing laser induced fluorescence (LIF) technique, which enables 2-dimensional measurement of the internal EGR in an engine cylinder, was developed. The distinguishing feature of this technique is the utilization of a fuel additive that does not itself emit an LIF signal under irradiation with UV-light, but whose combustion products produce strong LIF emissions. An inhomogeneous internal EGR distribution was confirmed to exist at the time of ignition.
3. Noise-cancelling Spike Combustion: A New Concept to Reduce Combustion Noise by Interference of Two Pressure Rise Peaks (766kB)

pages 13-21
Takayuki Fuyuto, Masahiro Taki, Hiroshi Kuzuyama and Tsutomu Umehara

Noise-cancelling occurs between the two peaks in the pressure rise rate, which reduces the overall combustion noise by reducing the maximum frequency component of the noise spectrum. The period of this frequency is twice as long as the interval between the two peaks. We named this noise reduction technique “Noise-cancelling Spike Combustion”.

4. Ignition of Fuel-air Mixture by a Lubricant Oil Droplet(1,282kB)

pages 23-31
Mitsuaki Ohtomo, Hiroshi Miyagawa, Makoto Koike, Nozomi Yokoo and Koichi Nakata

The oil droplet initiated the flame propagation of the fuel-air mixture when the initial droplet temperature is over 250℃. The oil droplet heated by burned gas and remaining in the combustion chamber until the next cycle has a possibility to trigger the abnormal combustion called as LSPI.

5. A Study of Fuel Economy Improvements, and the Degradation and Recovery of Reforming Catalysts, in Engine EGR Reforming Based on Steam Reforming Fueled by Ethanol-blended Gasoline(1,194kB)

pages 33-47
Susumu Nagano

Engine exhaust-gas recirculation (EGR) reforming system improved the fuel economy of a 2.4 L spark ignition engine. And new catalysis activity recovery was shown with test pieces. It was found that the hydrogen generation was not degraded when the CZA (Ceria Zirconia Alumina) catalyst carrier is used over a period of 70 hours, using E85 fuel.

6. Multiple Experimental Approaches to Investigate Oil Transport Mechanism of Piston-liner System (3,101kB)

pages 49-59
Tomohisa Yamada, Hideto Inagaki, Yu Nozawa, Norikazu Katsumi, Kentaro Yamashita and Kiyoyuki Kawai

Lubricating oil transport phenomena and fluctuation of oil consumption were investigated using combinations of some unique measuring techniques. The oil consumption is dependent on the 2nd land pressure level, which is affected by the piston ring behavior. Therefore, control of the land pressure with an appropriate ring design is important.

7. Application of Stochastic Resonance to Improve the Performance of Pedestrian-recognition Systems in Halation Environments(1,762kB)

pages 61-69
Yukihiro Tadokoro, Seiya Kasai, Akihisa Ichiki and Hiroya Tanaka

Under glare conditions, sensors are saturated, which results in the failure of recognizing pedestrians. To avoid this situation, we propose simple method utilizing the phenomenon of supra-threshold stochastic resonance. We demonstrate that just adding noise to the driving voltage on sensors enhances the dynamic range, which enables the recognition in the concerned situation.

8. Automatic Process Design Technology for Two-dimensional Machining (489kB)

pages 71-73
Mitsuhiro Fujita and Kazunari Teramoto

This discussion describes an automated process design technology for two-dimensional machining that is capable of flexibly supporting the daily progress made in machining methods of machining. These changes can result from specific conditions or from knowledge of holes, grooves and surface planes of mold structures and other parts.