ディーゼルエンジンの過渡制御のための吸気温度推定手法の開発（第1報）
-定常運転における吸気温度の推定式の提案-

稲垣　和久（豊田中央研究所）・上野　彰孝（豊田自動織機）・菅野　翼（トヨタ自動車）・西尾　健（豊田自動織機）

最新のコモンレール式ディーゼルエンジンでは，多段燃料噴射により騒音と排出ガスを制御している．パイロット噴射の最適化には吸気温度予測が重要であり，本研究では吸気バルブ閉時の筒内温度Tivcを定義し，定常運転での予測式を提案．Tivcはインマニ温度・冷却水温・出力の線形和で推定可能で，シミュレーション結果は実験と一致し，式の妥当性が確認された．

Range extender ICE solutions to accelerate time-to-market for HD BEV trucks

Anton Arnberger (AVL List)･Toro Nishizawa (AVL Japan K.K.)･Daniele Corsini･Bernhard Raser (AVL List)

In different markets, commercial vehicle manufacturers face increasingly stringent CO₂ regulations. Today, there are viable use cases for battery-electric trucks (BEVs), particularly when cost-effective charging at depots is possible. However, operational flexibility remains limited: public charging infrastructure is often unavailable, impractical in dense metropoles such as those in Japan, or expensive in terms of cost per kWh. This presentation introduces a diesel-based industrial range extender (REX) integrated into a BEV truck as a bridging solution. Diesel offers efficiency, durability, and logistical compatibility for this application. Nevertheless, its role as a range extender requires targeted modifications to achieve maximum efficiency across relevant mission profiles while ensuring the most compact packaging. The publication will address the dedicated engine design for REX applications as well as key aspects of vehicle integration.

Evolving HD Engine Efficiency to the next level
-A Pathway to 56% Brake Thermal Efficiency for Commercial Applications-

Anton Thomas Koerfer (FEV Group GmbH)･Lukas Virnich (FEV Europe)･Michael Franke (FEV North America Ltd.)･Stefano Ghetti･Ulrich Gruetering (FEV Europe)

The Diesel powerplant in heavy applications characterizes all over the world the backbone of goods transport. Driven by a variety of objectives, fuel efficiency has always displayed an engineering goal and will continue in the mid-term horizon. This paper reviews an innovative study based on an in-series engine definition in the 2 l/cyl class. The most important aspects include design elements as uplifted combustion pressure with higher compression ratios and innovative bowl geometries, supported by upgradations on fuel and air delivery side, but include also novel S/B ratios and adjusted stroke characteristics, plus thermal coating for reduction of heat losses

壁面に衝突した燃料噴霧火炎の流動と壁面粗さの関係

座間　淑夫・深町　優晴（群馬大学大学院）・古川　伸哉（いすゞ中央研究所）

本報告では衝突噴霧火炎の流動に及ぼす壁面粗さの影響をマクロからミクロの領域における速度場情報を用いて議論した．その結果，実験で用いた壁面の粗さが粘性底層厚さより小さいことが推察され壁面上を流れる火炎流動に及ぼす壁面粗さの影響は現れなかった．

High-heels型熱発生率によるディーゼル機関の熱効率改善
-（マルチインジェクタ燃焼系を用いた実機試験結果と解析）-

町井　輝男・内田　登（新エィシーイー）

冷却損失増加の可能性から更なる高等容度化は必ずしも熱効率改善に寄与しない．本研究ではむしろ等容度を低減するHigh-heels型熱発生率を提案し，これまでにマルチインジェクタ燃焼系による熱発生率プロフィール制御の可能性を主に数値計算にて検討してきた．本報では実機にて性能試験を行い，その熱効率改善要因の解析を実施した．