Device for detection of abnormality in pressure detector for internal combustion engine
AssigneesNippon Soken, Inc., Nippondenso Co., Ltd.
InventorsYoshinori Ootsuka, Tadashi Hattori, Minoru Yamamoto, Tadashi Ozaki
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Abstract
A device for detecting an abnormality in a pressure detector in an internal combustion engine. This device includes a piezoelectric pressure detector, a timing detection unit, a selective connection unit, and an abnormality detection unit. The abnormality detection unit includes a capacitor connected to an oscillation circuit, and the piezoelectric pressure detector is connected in parallel with the series connection of the oscillation circuit and the capacitor.
Claims8
A device for detecting an abnormality in a pressure detector in an internal combustion engine comprising:
- a piezoelectric type pressure detector;
- a timing detection means having an angular position detector, a reference position detector, and a timing calculation circuit for calculating the timing;
- a selective connection means for carrying out the selective connection of the output terminal of said pressure detector;
- and
- an abnormality detection means for receiving the output of said timing detection means and one of the outputs of said selective connection means,
- said abnormality detection means including a capacitor connected in series to an oscillation circuit,
- said pressure detector being connected in parallel with the series connection of said oscillation circuit and said capacitor.
Dependencies are inferred from the claim text.