| 摘要 |
The ECU (10) controls at least one components of a fuel injection system by outputting a control signal in accordance with a fuel pressure. The ECU (10) is initially designed based on a basic pattern of an output characteristic of a common rail pressure sensor (35) defined between a fuel pressure and an output signal. The output characteristic may vary in each sensor element. The ECU (10) detects an output signal (Vatm) corresponding to an atmospheric pressure to determine and learn the actual output characteristic of the common rail sensor (35), and corrects a control characteristic for the component in accordance with the leaned actual output characteristic. For example, the ECU (10) changes the output characteristic to the learned one. Control accuracy in a common rail fuel injection system can considerably be improved while achieving a considerable reduction in cost of fabricating the common rail pressure sensor.
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