Estimation of In-Cylinder Inhomogeneity in a Port-Fuel-Injected Spark-Ignition Engine at Cold Start
ポート噴射火花点火機関冷始動時の筒内不均質度推定
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- Publication code
- 20214583
- Paper/Info type
- JSAE Transaction
Vol.52 No.4
- Pages
- 826-832(Total 7 p)
- Date of publication
- Jul 2021
- Publisher
- JSAE
- Language
- Japanese
Detailed Information
| Category(J) | 研究論文 Translation |
|---|---|
| Category(E) | ResearchPaper |
| Author(J) | 1) 諏訪 大地, 2) 篠原 弘亘, 3) 荒木 幹也, 4) ゴンザレス・ファン, 5) 志賀 聖一 |
| Author(E) | 1) Daichi Suwa, 2) Hironobu Shinohara, 3) Mikiya Araki, 4) Juan C. Gonzalez Palencia, 5) Seiichi Shiga |
| Affiliation(J) | 1) 群馬大学大学院, 2) 群馬大学大学院, 3) 群馬大学大学院, 4) 群馬大学大学院, 5) 地域産学官連携ものづくり研究機構 |
| Abstract(J) | ポート噴射火花点火機関において，燃料が最初に筒内へ流入するサイクルに着目し，燃料液滴の存在，燃料混合気の不均質性，消炎層が燃焼に及ぼす影響を実験的に調査した．筒内の残存液滴ならびに混合気の不均質性は，燃焼範囲を過濃側にシフトさせる．不均質度推定モデルを用いることで，その影響を推算することができる． Translation |
| Abstract(E) | In-cylinder inhomogeneity in a port-fuel-injected (PFI) spark-ignition (SI) engine at cold start is investigated experimentally. The equivalence ratio distribution in cylinder is described assuming a normal distribution. The standard deviation, the degree of inhomogeneity, is determined based on the exhaust gas analysis. Before experiments, all the experimental setup including fuel is soaked for ten hours at defined soak temperatures. The test engine is driven by using a starter motor at a constant speed of 350 rpm and the fuel is injected once at a certain cycle. Just after the injection, the engine is stopped and the exhaust gas is rapidly confined using a solenoid valve installed downstream the exhaust valve. By using an FID, the exhaust mass of fuel is calculated. Without spark, the amount of fuel trapped in cylinder is measured. With the spark (with combustion), the amount of fuel trapped but not involved in combustion is measured. The standard deviation of equivalence ratio in cylinder is determined so that the exhaust mass of fuel estimated by model consistently reproduce the experimental results. The standard deviation of mixture is shown to be on the order of unity for a conventional configuration of PFI SI engine. |
