| 摘要 |
During the low load operation, this fuel injection control device reduces the initial armature (44) displacement speed of the solenoid actuator(2) that drives the open-close valve(5) against the low fuel pressure in the balance chamber(30), thereby lowering impact noise produced in the solenoid portions (40,41). When the engine is determined to be idling, a command pulse width(Pw) which energizes the solenoids (43) of the solenoid actuator(2) is calculated according to the target injection amount(Qb), the common rail pressure (Pc), and the target fuel injection timing(Ti). Since the initial period of the command pulse width(Pw), i.e., pull-in current conduction period(Pwpi), is set shorter than the pull-in current conduction period(Pwpi) for the high load operation of the engine, the initial armature (44) displacement speed of the solenoid(43) becomes relatively slow reducing the impact noise of the armature (44) abutting against the stopper. <IMAGE> |
