PROBLEM TO BE SOLVED: To reduce an influence exerted on a detection signal by a noise superimposed on a sensor ground of each sensor.SOLUTION: A signal processing device of construction machinery includes: an AD converter 122 that converts an analogue signal from a sensor S to a digital signal; an output line OL for inputting an analogue detection signal from an output terminal part SO of the sensor S into the AD converter 122; a ground line GL1 for inputting an analogue ground signal from a sensor ground SG of the sensor S into the AD converter 122; and a subtraction part 123 for outputting the result of calculation as the result of detection from the sensor S by calculating a difference between a digital detection signal by converted by the AD converter 122 and a digital ground signal converted by the AD converter 122.
【課題】各センサのセンサグランドに重畳するノイズが検出信号に与える影響を低減する。【解決手段】建設機械の信号処理装置は、センサSからのアナログ信号をデジタル信号に変換するAD変換器122と、センサSの出力端子部SOからのアナログ検出信号をAD変換器122に入力するための出力ラインOLと、センサSのセンサグランドSGからのアナロググランド信号をAD変換器122に入力するためのグランドラインGL1と、AD変換器122で変換されたデジタル検出信号と、AD変換器122で変換されたデジタルグランド信号との差分を演算して、演算結果をセンサSからの検出結果として出力する減算部123とを備える。【選択図】図5
SIGNAL PROCESSING DEVICE OF CONSTRUCTION MACHINERY, AND OVERLOAD PROTECTOR OF CONSTRUCTION MACHINERY
建設機械の信号処理装置および建設機械の過負荷防止装置
2015-09-03
Patent
Electronic Resource
Japanese
IPC: | B66C Krane , CRANES |
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