| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection-quantity learning device improved in the learning accuracy of fuel injection quantity by stabilizing the driving of a supply pump. SOLUTION: When the injection quantity of a fuel from an injector is learned, a rail pressure feedback control of a common rail is stopped. Namely, when the injection quantity of the fuel from the injector is learned, the control of a fuel flow by a suction quantity control valve is stopped. Since the flow of the fuel discharged from the supply pump to the common rail is made constant, the variation of a load required for operating the supply pump is reduced. The variation of a load on a diesel engine driving the supply pump is also reduced thereby. Since the variation of the operating load of the diesel engine by the supply pump is reduced, the variation of the rotation of the diesel engine by fuel injection from the injector is accurately detected. The accuracy of detecting the fuel injection quantity according to the variation of rotation of the diesel engine is then improved. COPYRIGHT: (C)2009,JPO&INPIT
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