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AssigneeBosch Corporation
InventorsHirotaka Kaneko, Sakae Suda, Kenichi Iino
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It is possible to perform a failure diagnosis of a pressure sensor with a simple structure without installing a dedicated circuit for the failure diagnosis. In a common rail type fuel injection control apparatus, a pressure control valve 12 is provided in a fuel return path from a common rail 1, and a rail pressure detected by a pressure sensor 11 can be controlled to match a target rail pressure through drive control of the pressure control valve 12 by an electronic control unit 4. The target rail pressure is calculated based on operational information of an engine 3. In the common rail type fuel injection control apparatus, learning processing is performed, in which a correction coefficient Cv is stored and updated as a learning value to correct energization characteristics of a median product of the pressure control valves 12 that are stored in the electronic control unit 4. At the same time, it is determined whether the learning value of the correction coefficient Cv is within a predetermined range. When it is determined that it is not within the predetermined range, the pressure sensor 11 is diagnosed as having a failure.
A pressure sensor failure diagnosis method in a common rail type fuel injection control apparatus,
A common rail type fuel injection control apparatus that comprises a high pressure pump device that pressure feeds fuel to a common rail, a pressure control valve that is provided on a return path of fuel from the common rail, a pressure sensor that detects pressure of the common rail, and an electronic control unit that controls drive of the high pressure pump device and the pressure control valve,
Dependencies are inferred from the claim text.