文中提出一種基于CAN 總線的多點式數(shù)據(jù)采集和SPC 系統(tǒng),并介紹了SPC 數(shù)據(jù)采集盒
(SPC-Keyboard)硬件原理和CAN總線防沖撞通訊的設(shè)計；引入可標(biāo)定控制線實現(xiàn)非穩(wěn)態(tài)情況下由于控制線波動對異常因數(shù)判定的影響。通過實際應(yīng)用，驗證了該系統(tǒng)設(shè)計和實現(xiàn)的正確性和可靠性。
關(guān)鍵詞：CAN 總線；數(shù)據(jù)采集；統(tǒng)計過程控制；六西格瑪；實時診斷
Abstract: This paper presents a system design of multi-points data acquisition and SPC based
on CAN bus, and introduces the hardware design theory of SPC data acquisition boxes
(SPC-Keyboard) and the design of anti-collision communication based on CAN bus. Because
the Control-line of Control-chart is easy to be fluctuated and some abnormal factor can
not be found in precarious status, the design method is introduced to watch the abnormal
factor in control-chart by using fixed Control-line. The practical application has
confirmed that the system is accurate and reliable under this design framework.
Key words: CAN bus；data acquisition；SPC；6 sigma；Real-time diagnosis