摘要:
The invention concerns a method of determining the velocity of a pintle assembly in a solenoid fuel injector during a closing stroke of the pintle assembly, wherein a braking step is performed during the closing stroke, which comprises operating an injector driver with current regulator to establish a braking current in the solenoid coil. The velocity of the pintle assembly is derived from the duty-cycle of the current regulator during the braking step. A method of operating a solenoid fuel injector, in particular for gaseous fuel, using the so-determined pintle velocity is also disclosed.
摘要:
Fuel pressure regulator assembly (13) for an automotive vehicle comprising a fuel pressure regulator (20) which is mounted in an adaptor housing (16) along a main axis (Al), said adaptor housing (16) comprising an intermediate chamber (24) which is closed at its bottom part by the fuel pressure regulator (20) and which is provided with at least one opening (26, 28) for communication with a fuel supply line, said fuel pressure regulator (20) comprising a casing (38) having at least one fuel inlet (48) in its upper portion for communication with the intermediate chamber (24) and having at least one fuel outlet (62) in its bottom portion, characterized by a water collector (66) inserted in the intermediate chamber (24), above the fuel inlet (48) of the fuel pressure regulator (20), said water collector (66) comprising a recess portion (68) facing the opening (26, 28) in order to retain water (H2O) flowing down by gravity from the opening (26, 28) while the fuel pump (14) is idle.
摘要:
An ignition system and method of multicharge ignition are presented. The system comprisies an ignition coil (16) having primary (18) and secondary (20) windings and a control unit (30) configured to operate charging and discharging phases of the ignition coil (16) by actuation of a switching device (22) in order to create a first spark followed by a plurality of subsequent sparks at prescribed timings (t s1 ...t s4) . The control unit (30) is further configured to, during a respective spark-interval (T si ), monitor the energy level in the secondary winding (20) and stop the discharge phase and operate a charging phase, at the moment when the remaining time until the next prescribed timing (t si ) corresponds to the time required to charge the primary winding (18) to a prescribed energy level (I P _ tgt ).
摘要:
A method of controlling an internal combustion engine with an exhaust system comprising a catalytic converter is presented, wherein the engine is operable in a heat-up mode promoting the heating rate of said catalytic converter. In the heat-up mode the heat carried by the exhaust gases is iteratively determined; and the heat-up mode is terminated when the sum of the determined heat increments meets a heat threshold.
摘要:
Méthode (5) de pilotage d'un moteur ayant deux groupes de cylindres, un injecteur par cylindre et une arrivée d'air commune, les gaz d'échappement étant évacués par des lignes d'échappement distinctes chacune reliée à un groupe, chaque ligne d'échappement comprenant un piège à oxyde d'azote (NOx), la méthode (5) comprenant les étapes suivantes d'alimenter (50) les cylindres en air et en carburant selon un mode de combustion par défaut pauvre en carburant ayant un rapport massique (R1, R2) air/carburant supérieur au rapport stoechiométrique puis dès qu'un des pièges à NOx est saturé en NOx (52), basculer (54) selon un mode de combustion homogène-riche en carburant, le rapport massique (R1, R2) air/carburant étant alors inférieur au rapport stoechiométrique de sorte que le carburant non brûlé purge les pièges à NOx, et différencier (54) les mélanges injectés dans les groupes de cylindres en injectant plus de carburant dans le groupe de cylindres dont le piège à NOx a été détecté saturé que dans l'autre groupe de cylindres, de sorte que le rapport air/carburant injecté dans le groupe dont le piège à NOx a été détecté saturé soit inférieur au rapport massique air/carburant injecté dans l'autre groupe de cylindres, le piège à NOx qui était saturé se vidant alors plus rapidement que l'autre piège à NOx qui n'était que partiellement plein, puis revenir en mode de combustion pauvre (50) par défaut lorsque la purge est terminée.