| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel-pressure waveform obtaining device for highly precisely extracting a pressure waveform caused by a subject injection, which is any injection of a second and following stages among multistage injection, from a detection waveform at multistage injection. <P>SOLUTION: A fuel-pressure waveform obtaining device includes: a detection waveform obtaining means for obtaining a pressure waveform by means of a fuel-pressure sensor while performing a multistage fuel injection as a multistage injection pressure waveform W; a model waveform storage means in which a model waveform CALm being a reference pressure waveform of when a single fuel injection is performed is stored; a waveform extracting means S35 which extracts a pressure waveform due to the subject injection by subtracting a waveform CALn showing injection (n-1th injection), where any injection of the second and following stages among the multistage injection is set as the subject injection (n-th injection) prior to the subject injection among the model waveform CALm from the multistage injection pressure waveform W; a correction means S34 which corrects the model waveform CALn used for the extraction in such a manner that its attenuation degree becomes larger as a fuel injection period Tqn of the subject injection is longer. <P>COPYRIGHT: (C)2012,JPO&INPIT |
