| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection-quantity learning device for learning the injection quantity of a fuel in a wide pressure range in a short period of time. SOLUTION: When there is an undetected high rail pressure for which the learning of fuel injection quantity is not completed, the learning of fuel injection quantity is performed according to the rail pressure for which the learning has been completed. In this case, the learning of the fuel injection quantity at the undetected rail pressure is performed by using the learned value of the fuel injection quantity learned at a rail pressure with increased correlation to the undetected rail pressure. Even when the chance of learning of a minute fuel injection quantity is less in the same way as when the pressure in a common rail is high, therefore, the change of the fuel injection quantity due to the change of the characteristic with time of the injector is learned. As a result, the error between an actually measured value and the learned value is reduced in the wide range of the rail pressure, and the fuel injection quantity is precisely controlled. COPYRIGHT: (C)2009,JPO&INPIT
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