Effect of Mixture Distribution on HC Species Formation in SI Engines

Junki Hori･Naoki Yoshioka (Mazda)･Keisuke Yamamoto (Hiroshima University)･Yuya Honda･Michiharu Kawano･Tatsuya Fujikawa (Mazda)･Masahisa Yamakawa･Akira Miyoshi (Hiroshima University)

The use of CN fuel and ZeroEM are essential for future ICE. Catalysts have different purification characteristics depending on the HC species. Low alkanes are particularly difficult to purify and must be reduced by combustion.It is known that lower alkanes remain in higher amounts under rich conditions, but the mechanism of their formation in the cylinder has not been fully understood.In this report, we analyzed the effect of the mixture distribution in the cylinder on the formation of HC species using numerical calculations and the actual engine.

Study on Clarification of Formation Factors of Deposits on Air-fuel Ratio Sensors

Kento Okusa･Kenta Furutani･Kazuho Yoshida･Kotaro Tanaka (Ibaraki University)･Shouta Tobe･Kouta Ishizaka･Tasuku Hasejima･Tetsuo Kitagawa･Masahiro Ono (SUBARU)

Deposits form on the air-fuel ratio sensor used for air-fuel ratio control in direct-injection gasoline spark-ignition engines and affect the signal response of the sensor. In this study, the formation mechanism of deposits on the air-fuel ratio sensor was investigated using an gasoline engine and the factors that affect the response of the air-fuel ratio sensor were clarified.

Material-less calibration using a One-dimensional Engine Model

Isshu Yoshiki･Hiroaki Tone･Akihiro Katsuura･Suguru Fukuda (Honda Motor)

In the development scene of internal combustion engines, there is a demand for shortening the development period and reducing development costs. This paper presents an initiative that enables the proposal of calibration values that meet the selected specifications in a short period of time, by conducting a simulation of the intake air quantity using a one-dimensional engine model, while reducing development costs without using actual machines.

Research of Micro Flow Rate Cooling Control System with Electric Water Pump for Gasoline Engine

Keijiro Koide･Takafumi Murakami･Yutaka Yoshida･Masahiro Suganuma･Naoto Sasaki (Honda Motor)

As the interest in fuel economy and emissions increases, we have defined a flow rate region called "extremely low flow rate" in order to improve engine warm-up performance. In this study, we describe the estimation method of the effect using prediction technology centered on one-dimensional simulation using MBD at the performance design stage, the mechanism of the fuel economy effect due to extremely low flow rate, and the expected additional effects.

Analysis and Model Evaluation of Post-Oxidation Phenomena in Exhaust Manifold of Gasoline Engine

Teruaki Ishikawa･Tatsuya Kuboyama･Yasuo Moriyoshi (Chiba University)

Post-oxidation in the exhaust manifold is known as a method to improve engine performance and reduce emissions. The mechanism of post-oxidation in the exhaust manifold was evaluated by conducting tests on actual engines with different exhaust systems and fuel injection patterns. The post-oxidation phenomena were incorporated into a one-dimensional simulation model to improve the accuracy of the simulation.