{"id":8437,"date":"2023-11-02T08:05:27","date_gmt":"2023-11-02T08:05:27","guid":{"rendered":"https:\/\/lhm-instrumentation.eu\/?p=8437"},"modified":"2023-11-02T08:09:16","modified_gmt":"2023-11-02T08:09:16","slug":"quel-est-le-cycle-de-travail","status":"publish","type":"post","link":"https:\/\/lhm-instrumentation.eu\/fr\/kenniscentrum\/algemeen\/wat-is-de-duty-cycle\/","title":{"rendered":"Qu'est-ce que le cycle de travail ?"},"content":{"rendered":"
\n\t
\n\t\t
\n\t\t\t

Qu'est-ce que le cycle de service ?<\/h4>\n

\"Quel<\/p>\n

Le cycle de travail<\/strong>\u00a0est le rapport entre la dur\u00e9e pendant laquelle une charge ou un circuit est sous tension et la dur\u00e9e pendant laquelle la charge ou le circuit est hors tension.<\/p>\n

Le rapport cyclique, parfois appel\u00e9 \u2018facteur de service\u2019, est exprim\u00e9 en pourcentage de la dur\u00e9e d'activation. Un rapport cyclique de 60% indique qu'un signal est activ\u00e9 60% du temps et d\u00e9sactiv\u00e9 40% le reste du temps.<\/p>\n

\"qu'est-ce<\/p>\n

 <\/p>\n

De nombreuses charges sont rapidement allum\u00e9es et \u00e9teintes par l'interm\u00e9diaire d'un commutateur \u00e9lectronique \u00e0 action rapide qui g\u00e8re avec pr\u00e9cision la puissance de sortie de la charge. Le fonctionnement de la charge - comme la luminosit\u00e9 d'une lampe, la puissance d'un \u00e9l\u00e9ment chauffant et la force magn\u00e9tique d'une bobine - peut \u00eatre contr\u00f4l\u00e9 sur la base d'un cycle de travail via des p\u00e9riodes d'allumage et d'extinction ou des cycles par seconde.<\/p>\n

 <\/p>\n

Cycle de travail simplifi\u00e9<\/h4>\n

Si l'atomiseur est activ\u00e9 par impulsions avec une dur\u00e9e variable (on parle de modulation de largeur d'impulsion), le rapport cyclique est toujours diff\u00e9rent. Si l'atomiseur est activ\u00e9 par impulsions pendant 0,05 seconde d'un cycle de 0,1 seconde, le rapport cyclique de l'atomiseur de carburant est de 50%. Si l'atomiseur est activ\u00e9 par impulsions pendant 0,09 seconde du m\u00eame cycle de 0,1 seconde, le rapport cyclique de l'injecteur de carburant est de 90%.<\/p>\n

 <\/p>\n

Exemple de cycle de travail<\/h4>\n

Dans un syst\u00e8me d'injection \u00e9lectronique de carburant de voiture, les impulsions de tension envoy\u00e9es au sol\u00e9no\u00efde de la soupape d'injection de carburant commandent cette derni\u00e8re \u00e0 une fr\u00e9quence fixe de 10 cycles par seconde ou 10 Hz.<\/p>\n

La modulation de largeur d'impulsion permet un contr\u00f4le \u00e9lectronique pr\u00e9cis de l'alimentation en carburant du moteur. La tension moyenne pour chaque cycle de travail est d\u00e9termin\u00e9e par la dur\u00e9e de l'impulsion.<\/p>\n

Les \u00e9lectrovannes \u00e0 commande par cycle de travail utilisent un signal de cycle de travail variable pour faire varier le d\u00e9bit ou ajuster la pression. Plus l'\u00e9lectrovanne reste ouverte longtemps, plus le d\u00e9bit est important et plus la pression accumul\u00e9e est faible. Ces \u00e9lectrovannes sont command\u00e9es par l'alimentation \u00e9lectrique ou la masse.<\/p>\n

 <\/p>\n

Qu'est-ce que la largeur d'impulsion ?<\/h4>\n

La largeur d'impulsion est une mesure du cycle de fonctionnement r\u00e9el en millisecondes. Le temps de d\u00e9sactivation n'affecte pas la largeur d'impulsion du signal. La seule valeur mesur\u00e9e est la dur\u00e9e pendant laquelle le signal est activ\u00e9 (contr\u00f4l\u00e9e par la masse).<\/p>\n

R\u00e9f\u00e9rence :<\/strong>\u00a0Digital Multimeter Principles par Glen A. Mazur, American Technical Publishers.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>

<\/span><\/div><\/div><\/div><\/div><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"Qu'est-ce que le rapport cyclique ? Le rapport cyclique est le rapport entre la dur\u00e9e pendant laquelle une charge ou un circuit est sous tension et la dur\u00e9e pendant laquelle la charge ou le circuit est hors tension. Le rapport cyclique, parfois \u00e9galement appel\u00e9 'facteur de service', est exprim\u00e9...","protected":false},"author":9,"featured_media":8438,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[302,279],"tags":[],"class_list":["post-8437","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-algemeen","category-kenniscentrum"],"yoast_head":"\nwat is de duty-cycle?<\/title>\n<meta name=\"description\" content=\"De duty-cycle is de verhouding tussen de duur die een belasting of circuit AAN is ten opzichte van de duur gedurende welk de belasting of het circuit UIT is\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lhm-instrumentation.eu\/fr\/centre-de-connaissances\/general\/quel-est-le-cycle-de-travail\/\" \/>\n<meta property=\"og:locale\" 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