sp\u00e9cialis\u00e9 dans la v\u00e9rification et la validation<\/strong>\u00a0des performances d\u00e9clar\u00e9es par les constructeurs automobiles.<\/h3>\nD\u2019apr\u00e8s les essais men\u00e9s par cet organisme, le moteur a atteint un\u00a0rendement thermique maximal de 45,5 %<\/strong>, un chiffre officiellement certifi\u00e9 le 22 mai et communiqu\u00e9 aujourd\u2019hui.<\/p>\nCe r\u00e9sultat est particuli\u00e8rement notable, car il concerne un 2.0 turbo d\u00e9velopp\u00e9 pour des syst\u00e8mes hybrides destin\u00e9s surtout aux\u00a0SUV et aux v\u00e9hicules de grand gabarit<\/strong>, un segment o\u00f9 il faut concilier performances \u00e9lev\u00e9es, capacit\u00e9 \u00e0 encaisser des charges importantes et efficacit\u00e9 \u00e9nerg\u00e9tique.<\/p>\n <\/p>\n
Combustion contr\u00f4l\u00e9e et r\u00e9duction du cliquetis<\/h2>\n
Le c\u0153ur du projet repose sur une nouvelle architecture de combustion baptis\u00e9e\u00a0MAKC<\/strong>, d\u00e9velopp\u00e9e par\u00a0Dongfeng\u00a0afin d\u2019am\u00e9liorer la gestion du processus thermodynamique et de limiter le ph\u00e9nom\u00e8ne de cliquetis. Le moteur adopte une configuration \u00e0 longue course avec un rapport de 1,29 entre course et al\u00e9sage, un choix qui favorise une propagation plus ma\u00eetris\u00e9e du front de flamme dans la chambre de combustion.<\/p>\n <\/p>\n
Le syst\u00e8me int\u00e8gre une\u00a0injection directe<\/strong>\u00a0haute pression \u00e0 350 bar et un syst\u00e8me d\u2019allumage \u00e0 haute \u00e9nergie, une combinaison qui permet d\u2019augmenter le taux de compression tout en maintenant le moteur dans sa plage de rendement maximal sur un large spectre de charges.<\/p>\nS\u2019y ajoute un\u00a0syst\u00e8me EGR basse pression<\/strong>\u00a0refroidi, con\u00e7u pour abaisser les temp\u00e9ratures de combustion et r\u00e9duire la propension au cliquetis. Selon les donn\u00e9es communiqu\u00e9es par l\u2019entreprise, cette solution peut am\u00e9liorer la consommation du v\u00e9hicule de 3 % \u00e0 10 %, selon les conditions d\u2019utilisation.<\/p>\n <\/p>\n
R\u00e9duction des pertes et contexte du march\u00e9 hybride<\/h2>\n
Au-del\u00e0 de la combustion, les ing\u00e9nieurs ont travaill\u00e9 sur la\u00a0r\u00e9duction des pertes m\u00e9caniques internes<\/strong>. Le moteur utilise une pompe \u00e0 huile \u00e0 cylindr\u00e9e variable \u00e0 commande \u00e9lectrique, tandis que les pi\u00e8ces en mouvement re\u00e7oivent des rev\u00eatements DLC (diamond-like carbon) afin de limiter les frottements.<\/p>\nLe\u00a0turbocompresseur \u00e0 g\u00e9om\u00e9trie variable<\/strong>\u00a0permet \u00e9galement de maintenir la puissance dans des conditions exigeantes, comme la conduite en altitude jusqu\u2019\u00e0 2 500 m\u00e8tres ou les longs trajets autoroutiers \u00e0 pleine charge. R\u00e9sultat : une zone de fonctionnement \u00e0 haut rendement \u00e9largie de 30 % par rapport aux g\u00e9n\u00e9rations pr\u00e9c\u00e9dentes.<\/p>\nLe contexte est celui d\u2019un march\u00e9 chinois de l\u2019hybride de plus en plus comp\u00e9titif, o\u00f9 un rendement thermique de 45 % est d\u00e9sormais devenu une r\u00e9f\u00e9rence technique pour les SUV de nouvelle g\u00e9n\u00e9ration. Des constructeurs comme Geely et Chery placent eux aussi la barre plus haut, avec des valeurs annonc\u00e9es encore sup\u00e9rieures ou des syst\u00e8mes hybrides de conception nouvelle.<\/p>\n
via motor<\/p>\n","protected":false},"excerpt":{"rendered":"
La Chine continue d\u2019investir dans le d\u00e9veloppement des motorisations hybrides.\u00a0Dongfeng\u00a0a annonc\u00e9 que le\u00a0nouveau Mach Power 2.0T\u00a0a obtenu la certification CATARC Huacheng, d\u00e9livr\u00e9e par un organisme chinois ind\u00e9pendant\u00a0sp\u00e9cialis\u00e9 dans la v\u00e9rification […]<\/p>\n","protected":false},"author":1,"featured_media":7539,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-7538","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-automobile"],"yoast_head":"\n
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![\"Le](\"https:\/\/cdn.motor1.com\/images\/mgl\/rKJGlE\/s3\/il-motore-ibrido-da-record-con-efficienza-al-45-5.jpg\")
<\/p>\n