Method and system for starting combustion engines

Details Method and system for starting combustion engines Method and system for starting combustion engines

F - Mech Eng,Light,Heat,Weapons

02

D

F02D 41/06 (2006.01) F02D 41/34 (2006.01)

Patent

CA 2367739

The invention relates to a method and system for controlling fuel supply to a combustion engine (1) comprising at least two cylinders (4a...4d) during a start attempt. Injectors (13) for individual cylinders (4a...4d) are controlled such that the air-fuel ratio (A/F) obtained varies for each cylinder (4a...4d) by an amount .DELTA.f. The fuel injection to the cylinders (4a...4d) varies between the leanest air-fuel ratio and the richest airfuel ratio practically feasible during starting. If the engine (1) does not start within a predetermined number of cycles an incremental increase (.DELTA.fSTEP) of the fuel supply is initiated for each predetermined number of cycles following thereafter.

L'invention concerne un procédé et un système de commande de l'alimentation en carburant d'un moteur à combustion (1) comprenant au moins deux cylindres (4a 4d), lors d'un essai de démarrage. Les injecteurs (13) des cylindres (4a 4d) sont commandés de manière que le rapport air-carburant varie pour chaque cylindre (4a 4d) selon une quantité .DELTA.f. L'injection de carburant dans les cylindres (4a...4d) varie du rapport air-carburant le plus pauvre au rapport air-carburant le plus riche, qui puissent exister de manière pratique, lors du démarrage. Si le moteur (1) ne démarre pas dans l'intervalle d'un nombre déterminé de cycles, une augmentation incrémentielle (.DELTA.f¿STEP?) de l'alimentation en carburant se produit pour chaque nombre déterminé de cycles suivants.

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