西门子发动机管理系统.pdf

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1、United power of automotive electronics.SASCO P GSTechnical PresentationEMS Functions发动机管理系统 功能介绍Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 2发动机管理系统功能发动机信号同步发动机转速通过安装在曲轴轴线上的曲轴位置传感器触发轮及传感器进行测量.第一缸的检测通过安装在凸轮轴轴线上的凸轮轴位置传感器触发轮及传感器进行测量.如果在缺齿后的第一个下降沿检测到凸轮位置传感器的信号

2、为低,则接下来的TDC为第一缸的TDC.123456 CRK signal CAM signal118117112113114115116126 CRK before TDC#0(1 cylinder)+2 teeth-2 teeth84CRK before TDC#0(1 cylinder)Two missing teethElectrical switch of signal(at CVVT systems end position/max retarded)Standard PresentationSASCO P GS/MK/technical presentation_EMS func

3、tion_standard.pptPage 3发动机管理系统功能喷油控制ddddddddddddddddduddvddwdd顺序多点燃油喷射系统(SFI)是一个气口喷射的电子燃油计量系统.ECU通过发动机转速及测量的进气质量确定总的喷油量.Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 4发动机管理系统功能喷油控制依据发动机运行状态及冷却水温度进行开环控制和闭环控制的切换r闭环控制通过氧传感器的反馈调整喷油时间pd主要是将s控制在三元催化器转换效率高的工作窗口内r开环

4、控制时pd喷油量依据动机运行状态通过预先设定的喷油时间得到.启动状态:?名义值起决于冷却水温度,并基于大气压力和发动机转速进行校正.非启动状态:?喷油时间通过不同的参数进行校正:冷却水温度,进气温度,电瓶电压,氧传感器的反馈调整,全负荷,A/C,动力转向.Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 5发动机管理系统功能喷油控制?进气质量计算:进气质量通过进气压力和发动机转速及一些校正量进行计算.Manifold Air PressureAcquisitionAir

5、 Path ModelMass Air FlowInjection Timeair temperaturecoolant temperatureambiant pressurethrottle positionengine speed.pthrmthr.mkgh.pambmcyl.pimTim,VimpexTex,Vexlaw of mass conservation:pRTVmimgimimkkflows.*.=pRTVmmimgimimthrcyl.*(.)=law of mass conservation:pthrmthr.mkgh.pambmcyl.pimTim,VimpRTVmimg

6、imimkkflows.*.=pRTVmmmimgimimthregrcyl.*(.)=+EGR-Valvemegr.pexTex,VexModel of the Intake Manifold without EGRModel of the Intake Manifold with EGRStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 6发动机管理系统功能喷油控制?燃空比调整:燃油混合气浓度必须控制:为满足排放标准 限制发动机排放(CO,NOx 和HC)燃空比必须控

7、制在 0.990 到1.015 的三元催化器转换效率高的窗口内 上游氧传感器监测混合气的浓与稀.P/I(比例/积分)控制器对混合气的燃空比进行调整.012345670,70,80,911,11,2richness(1/lambda)CO(%)00,10,20,30,40,50,60,7NOx,HC(%)CONOxHCNOxHCCOCatalyst windowEngine emissions&richness adjustment0204060801000,980,9911,011,02richness(1/lambda)efficiency(%)020406080100efficiency(

8、%)CONOxHCNOxHCCOCatalyst efficiencyClosed loop P/I controller40mV800mV1 to 3 secondsInjection Time Correction due to signal=1Rich mistureLean mixturetimeO2 sensor signalStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 7upstreamdownstreamDiagnosis resultCatalyst

9、 OKCatalyst OKfaulty catalyst发动机管理系统功能喷油控制?怠速修正?大气压力修正?闭环控制模式?断油控制?全负荷及三元催化器过热保护?发动机老化补偿 用自适应策略补偿氧传感器,发动机及零部件的老化?三元催化器清吹 断油后故意进行浓控制以监测下游氧传感器信号?P-jump 延时调整:下游氧传感器控制A/F修正 监测下游氧传感器信号并调整P-jump延时以获得最佳的NOX转换效率Mass Air Flowengine speedClosed loop areaidle full loadCatalystprotectionStandard PresentationSAS

10、CO P GS/MK/technical presentation_EMS function_standard.pptPage 8发动机管理系统功能喷油控制?管壁油膜现象 当燃油喷入发动机时,一部分燃油沉积在进气歧管壁 并在其内表面形成油膜.这就是管壁油膜现象.另外一部分则与空气混合进入气缸燃烧.实际上进入气缸的燃油还有一部分来自管壁油膜.这两部分的比例是变化的.在发动机瞬态过程中必须考虑管壁油膜现象以保证空燃比接近1.在发动机冷启动过程中必须考虑管壁油膜现象.Wall film fuelFuel flowVapor fuelInlet andexhaust valveThrottle pos

11、itionInjection TimeCylinderInjection TimeBasicThrottle positionWall FimCorrectionInjection TimeBasicStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 9发动机管理系统功能点火控制在每个发动机转速和负荷点,都有一个特定的点火提前角能得到最大的扭距和最佳的燃油经济性.对动态过程,如怠速转速控制,爆震控制等,对特定地气缸和运行工况计算点火提前角.点火由无分电器系统完成(half

12、 static system with a double ended wasted spark or individual ignition system).采集MAP信号后,每个TDC都进行点火提前角的计算.Ignition AngleCalculationDwell timecalculationIgnitionControlMINDwell timeMAXDwell timeIGBT ProtectionBurn TimeMeasurementIgnitionDiagnosisErrorManagementIgnitionangleDwell timeIgnition cut offBu

13、rntimeErrorEngine speedBattery voltageEngine speedLoadCoil controlShort circuitSpark durationTorque vs Ignition Angle-10103050709011051525354555Knocking areaOptimal Ignition AngleStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 10发动机管理系统功能点火控制启动状态:?点火提前角为一个与冷却水

14、温度及发动机转速有关的值.非启动 状态:?点火提前角通过发动机转速和进气质量双重插值得到,但要考虑修正:?怠速状态:修正起决于冷却水温度和三元催化器加热功能 加上一个与冷却水温度有关的点火提前角.?非怠速状态:修正起决于EGR和点火修正.Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 11发动机管理系统功能点火控制?闭合时间控制?点火提前角修正 启动后修正,怠速稳定性修正,温度修正,三元催化器加热修正,Instationary修正,断油修正,Anti-jerk修正,T

15、railing throttle修正,爆震修正,负荷变化修正,空调控制修正等.?点火提前角限值:Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 12发动机管理系统功能爆震控制爆震是一种自燃?燃烧室内的压力/温度?特别角度范围/表面爆震的特点?瞬间的:燃烧室参数?统计的和再发生:爆震有时自动诱发爆震?危险的自燃现象正常正常爆震物理现象Standard PresentationSASCO P GS/MK/technical presentation_EMS functio

16、n_standard.pptPage 13发动机管理系统功能爆震控制物理现象重要的相关参数?点火提前角?燃油标号(Octane rating-RON)?空燃比?发动机本身参数?环境情况:温度 湿度?老化Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 14发动机管理系统功能爆震控制异常燃烧?噪音性能?低效 扭距?油耗增加破坏的方面?火花塞熔化?活塞熔化或损坏?燃烧室损坏Necessity to prevent,detect&correct this phenomenon

17、后果Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 15发动机管理系统功能爆震控制爆震监测基于对发动机缸体加速度的测量.数据采集被标定在一个与燃烧相对应的窗口内.通过处理这个信号得到一个能反映爆震能量的值.超过一个标定值时系统确定有爆震并减少点火提前角.?两种爆震修正:慢速爆震修正和快速爆震修正.快速爆震修正仅在接近全负荷时才使用.?如果在达到最大的爆震修正值时还有爆震,将增加喷油脉宽.?怠速,节气门关闭和冷却水温度低时,不进行爆震修正的计算.Knocksensor

18、signaltimeKnock time window:no knockValve noiseTDCTDCKnocksensor signaltimeKnock time window:knock detectedValve noiseTDCTDCpeak of ignitionStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 16050100CRK202530050050-202-2020501002025305010050100-202-202without kno

19、ckPressure signalwith knockPressure signalAccelerometer signal Low engine speedAccelerometer signal High engine speed发动机管理系统功能爆震信号特点Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 17NLdetection lineKNKSknocking cyclesNo knocking cyclesKNKS valuesGainoffsetAspe

20、cial algorithm is used in order to separate knock and noise based on the Energy Ratio Knock/Noise.发动机管理系统功能爆震控制Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 18发动机管理系统功能怠速控制怠速马达通过控制节流阀体旁通空气的流量控制怠速怠速控制中应考虑的因素:?发动机运行点,?怠速转速控制(PID 调节),?动力转向修正,?A/C修正,?冷却风扇修正,?电负荷

21、修正,?Dashpot?冷启动修正,?自适应策略补偿发动机及零部件的老化1234ECUStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 19发动机管理系统功能废气再循环控制废气再循环的主要目的是通过降低燃烧温度以减少NOX的排放.有两种激活EGR功能的条件:?一种起决发动机工况(低优先权):冷却水温度必须大于一个限值,进气温度必须大于一个限值,发动机转速必须在两个限值之间?另一种起决控制策略的进程(高优先权).Pin xx Vbat after main relay E

22、CU Pin xx EGR control O 2 sensor Catalyst EGR Valve 05101520253035400102030HCNOxEGR ratio(%)HCNOxEngine emission(g/h)Engine emission with EGRStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 20发动机管理系统功能燃油蒸发排放控制燃油蒸发排放控制系统包括炭罐及炭罐脱附控制电磁阀如果发动机的运行状况(TPS,闭环控制,冷却水温度,进气

23、压力,发动机转速)满足条件,则通过激励电磁阀对炭罐进行脱附燃油蒸发排放控制与Lambda控制和Lambda自适应有密切关系.ddddddEGR ValveStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 21发动机管理系统功能燃油蒸发排放控制FAC_CPLAM_MVLAM_MV_DIF_CPLAM_TRAC_LAM_MAX_TRA1C_LAM_MAX_TRA_2LEARNING MODENORMAL MODECLOSECLOSE SLOPET_STATET_Ti_AD_

24、1T_CP_2T_TI_AD_1C_LAM_MAX_TRA_210000CLOSEStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 22发动机管理系统功能燃油蒸发排放控制EVAP有三种运行模式?STAND BY 模式,炭罐电磁阀关闭,没有脱附?MIN模式,由于不能确定炭罐的负载,炭罐电磁阀以最小的开度运行?NORMAL模式,快速脱附和依据炭罐的负载对A/F修正.在NORMAL模式中(NORMAL-mode),控制炭罐脱附电磁阀的占空比 由一个预定的控制值和一个修正值组成

25、.另外,炭罐的负载状况,在确定其饱和度时由修正值的变动确定.在确定其饱和度时通过炭罐电磁阀进入发动机的气量被限定在一个适当的值.进入发动机混合气的最大浓度被限定.?RAMP模式,三种稳态运行模式间切换的过渡模式 当条件满足时,在RAMP模式学习炭罐的负载Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 23Monitoring Strategiesall systems or components which participate toemissions decrea

26、seDriver informationM.I.LFault code managementAfter service information:area and nature of malfunctionfailuredetected发动机管理系统功能车载诊断系统Standard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 24DiagnosticsDiagnosticsDiagnosticswith ABC orwithout ABCErrorManagementDiagnost

27、ics CommunicationDashboard lampsScan tool orCustomer tools发动机管理系统功能车载诊断系统?记录故障状态(DTC,freeze frame etc.handling)?为维修及监测收集并提供故障信息(environment data,freeze frame)?通过故障灯提醒驾驶员与排放有关的故障(MIL handling)?满足法规要求:CARB(US market)/EOBD(Europe market)Standard PresentationSASCO P GS/MK/technical presentation_EMS func

28、tion_standard.pptPage 25EMS2000EMS2000系统功能系统功能控制功能表控制功能基本可选1燃油喷射控制-Injection by cylinder individual mode(CIFI)O-Pre-Injection in group mode(2 Cylinder)O-Start of injection map during startO-Warm-up with correction for catalyst heatingO-W arm-up with correction for rich engine out(with secondary air)

29、O-Full load enrichmentO-Acceleration correction with wall film correction O-Deceleration correction by wall film modelO-Cylinder shut off with wall film compensationO-Lambda control with positive/negative P-I controllerO-Lambda control with two sensorsO-Lambda control transient conditionsO-Lambda ad

30、aptation additiveO-Lambda adaptation multiplicativeO-Torque control by injection time and cylinder shut off(with TCS)O-Injection time correction at idle O-Catalyst protection by fuel enrichmentO-Injection correction under restart conditionsO-Injection delay time correctionOStandard PresentationSASCO

31、 P GS/MK/technical presentation_EMS function_standard.pptPage 26EMS2000EMS2000系统功能系统功能控制功能表控制功能（续）基本可选2 点火控制-Dwell time correction by battery voltageO-Dwell time correction by engine speed and battery voltageO-Multiple spark during crankingO-Individual spark angle controlO-Individual knock controlO-

32、Individual knock windowO-Individual knock signal amplificationO-Individual dynamic spark controlO-Individual dynamic spark adaptationO-Adaptation of steady state knock control correctionO-Full load spark correctionO-Spark retard by TCU shift signal(CAN)O-Spark retard during rich warm-up(with seconda

33、ry air system)O-Torque control by spark retard(with traction control system)O-Idle spark mappingO-Idle spark correction by idle speed deviationO-Idle spark correction by load engagementO-Spark correction by anti-jerkO-Spark correction by variable intake control system(VICS)OStandard PresentationSASC

34、O P GS/MK/technical presentation_EMS function_standard.pptPage 27EMS2000EMS2000系统功能系统功能控制功能表控制功能（续）基本可选3怠速控制O-Idle speed actuator linearization tableO-Idle speed actuator characteristic adaptationO-Idle speed maps by load(A/C,A/C compressor,P/N inform.,electric loads 厎)O-Idle speed charge control by

35、 PID controllerO-Adaptation of idle speed charge requirements from the engine speed and loadO-Idle speed correction(by secondary air load)O-Dash-pot functionO-Manifold pressure limitationO4炭罐清吹控制-Linearization table of canister purge control valve characteristicsO-Adaptation of canister loadO-Canist

36、er purge at idle conditionO-Canister purge in open loop conditionO5废气再循环控制-Battery correction for EGR actuator O-EGR map by engine speed and loadO-EGR diagnosis by usage of EGR temperature sensorOStandard PresentationSASCO P GS/MK/technical presentation_EMS function_standard.pptPage 28EMS2000EMS2000

37、系统功能系统功能控制功能表控制功能（续）基本可选6二次空气控制-Secondary air pump control by relayO-Secondary air flow control by control valveO7牵引力控制（通过发动机扭矩）-Communication interface by CANO-Engine torque control by spark retard/cylinder shut offO-Engine torque control by main throttle control(MTV)O8通过诊断线与防盗控制模块的通信O9辅助功能-Engine

38、speed limitation by cylinder shut offO-Vehicle speed limitation by cylinder shut offO-Variable valve timing control by On-Off control with position feed back O-Variable valve timing control by linear position closed loop controlActive control-Variable intakesystem by engine speed/throttle position mapO-Battery correction for EGR actuatorO10基于 KWP2000标准的输入/输出信号诊断O11OBD II/EOBD 诊断O