Title:
SIGNAL PROCESSING CIRCUIT OF CYLINDER INTERNAL PRESSURE SENSOR
Document Type and Number:
Japanese Patent JP2022039438
Kind Code:
A
Abstract:
To achieve a signal processing circuit of a cylinder internal pressure sensor that makes it possible to make a more accurate correction of an amplification factor even under an environment in which a pressure greatly changes.SOLUTION: A signal processing circuit 40 of a cylinder internal pressure sensor 1 comprises a detection unit 42 and a variable amplification unit 43. The detection unit 42 is configured to detect a voltage value generated when flowing a constant current to a sensor unit 6, or a current value flowing when applying a constant current to the sensor unit 6. The variable amplification unit 43 is configured to set an amplification factor on the basis of the voltage value or current value detected in the detection unit 42, and generate an amplification signal made by amplifying a pressure signal output from the sensor unit 6 at the amplification factor. Further, the detection unit 42 is configured to detect the current value or the voltage value only in an in-take stroke and exhaust stroke of four strokes of the in-take stroke, a compression stroke, a combustion stroke and the exhaust stroke of an internal combustion engine.SELECTED DRAWING: Figure 2
Inventors:
FUKUDA YASUHIRO
HIGUCHI YUZO
HIGUCHI YUZO
Application Number:
JP2020144456A
Publication Date:
March 10, 2022
Filing Date:
August 28, 2020
Export Citation:
Assignee:
NGK SPARK PLUG CO
International Classes:
G01L23/18
Attorney, Agent or Firm:
Patent Business Corporation Grund Patent Office
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