车用发动机
車用髮動機
차용발동궤
2015年
1期
6-12,16
,共8页
柴油机%高压共轨%电控单元%判缸
柴油機%高壓共軌%電控單元%判缸
시유궤%고압공궤%전공단원%판항
diesel engine%high-pressure common rail%ECU%cylinder detection
对高压共轨柴油机判缸过程中的曲轴转角变化进行了试验研究，使用32位 T C1728芯片作为发动机EC U进行判缸程序开发，通过检测曲轴和凸轮轴信号，依靠两者的装配关系判断得到当前的曲轴转角，并使用60倍倍频信号计算曲轴转过角度，使曲轴转角的计算精度达到0．1°。在正常判缸模式中，使用检测独特信号片段的判缸方法，能够使判缸周期缩减到360°以内；单凸轮轴判缸中，若先测得凸轮轴独特信号片段0、片段1或片段2，判缸周期不大于360°，若先测到片段3或片段4，判缸周期不大于720°，且只有在先检测到片段3的情况下会发生一次误喷；单曲轴判缸中，检测到曲轴缺齿信号时预赋曲轴转角值，基于此角度喷油并判断是否产生加速，若预赋值正确，则不会产生误喷，若预赋值错误，则会产生一次误喷，但在360°后找到另一曲轴缺齿信号时，曲轴转角即能被修正。
對高壓共軌柴油機判缸過程中的麯軸轉角變化進行瞭試驗研究，使用32位 T C1728芯片作為髮動機EC U進行判缸程序開髮，通過檢測麯軸和凸輪軸信號，依靠兩者的裝配關繫判斷得到噹前的麯軸轉角，併使用60倍倍頻信號計算麯軸轉過角度，使麯軸轉角的計算精度達到0．1°。在正常判缸模式中，使用檢測獨特信號片段的判缸方法，能夠使判缸週期縮減到360°以內；單凸輪軸判缸中，若先測得凸輪軸獨特信號片段0、片段1或片段2，判缸週期不大于360°，若先測到片段3或片段4，判缸週期不大于720°，且隻有在先檢測到片段3的情況下會髮生一次誤噴；單麯軸判缸中，檢測到麯軸缺齒信號時預賦麯軸轉角值，基于此角度噴油併判斷是否產生加速，若預賦值正確，則不會產生誤噴，若預賦值錯誤，則會產生一次誤噴，但在360°後找到另一麯軸缺齒信號時，麯軸轉角即能被脩正。
대고압공궤시유궤판항과정중적곡축전각변화진행료시험연구，사용32위 T C1728심편작위발동궤EC U진행판항정서개발，통과검측곡축화철륜축신호，의고량자적장배관계판단득도당전적곡축전각，병사용60배배빈신호계산곡축전과각도，사곡축전각적계산정도체도0．1°。재정상판항모식중，사용검측독특신호편단적판항방법，능구사판항주기축감도360°이내；단철륜축판항중，약선측득철륜축독특신호편단0、편단1혹편단2，판항주기불대우360°，약선측도편단3혹편단4，판항주기불대우720°，차지유재선검측도편단3적정황하회발생일차오분；단곡축판항중，검측도곡축결치신호시예부곡축전각치，기우차각도분유병판단시부산생가속，약예부치정학，칙불회산생오분，약예부치착오，칙회산생일차오분，단재360°후조도령일곡축결치신호시，곡축전각즉능피수정。
The change of crank angle during the cylinder detection of high‐pressure common rail diesel engine was researched by the experiment .The cylinder detection procedure was developed based on ECU of 32‐bit TC1728 chip and the current crank angle was acquired by detecting the crankshaft and camshaft signals and analyzing the structure of assembling .The rotation an‐gle of crankshaft was calculated according to 60 times frequency signals and therefore the accuracy of crankshaft reached 0 .1° . In normal mode of cylinder detection ,the period of cylinder detection could be less than 360° by detecting the special signal se‐quence .For the camshaft signal ,the period of cylinder detection was not more than 360° if 0 ,1 or 2 signal sequence was first detected and was not more than 720° if 3 or 4 signal sequence was first detected .Only when 3 signal sequence was first detec‐ted ,one wrong injection would happen .For the single crankshaft signal ,the pre‐defined crank angle was assigned when the missing teeth were detected .Based on the pre‐assigned value ,the fuel injection was conducted and the injection timing was judged .When the assigned value was correct ,the wrong injection would not happen .On the contrary ,the wrong injection would happen and the wrong value would be corrected when the missing teeth was second detected .
