技术领域technical field
本发明涉及在内燃发动机运转过程中进行“车上”故障诊断的方法和装置。The invention relates to a method and a device for "on-board" fault diagnosis during operation of an internal combustion engine.
背景技术Background technique
自从柴油颗粒过滤器被应用于机动车辆起，内燃发动机碳烟排放的分析越来越多地通过对柴油颗粒过滤器的碳烟负荷的估算来进行。对内燃发动机中可能导致柴油颗粒过滤器超负荷的异常状况的估算，主要用于柴油颗粒过滤器超负荷情况的预测，以及当安全受控的再生不再可行时用于避免由于碳烟颗粒阻塞而引起的柴油颗粒过滤器更换。微粒过滤器负荷增大的另一个不利影响在于背压升高超过标称值，由此内燃发动机的燃油经济性和性能都会受到影响。Since the introduction of diesel particulate filters in motor vehicles, the analysis of soot emissions from internal combustion engines is increasingly carried out by estimating the soot load of the diesel particulate filter. Estimation of abnormal conditions in internal combustion engines that may lead to overloading of the diesel particulate filter, mainly for the prediction of overloading of the diesel particulate filter and for avoiding clogging due to soot particles when safely controlled regeneration is no longer possible caused by diesel particulate filter replacement. Another detrimental effect of increased particulate filter loading is the increase in back pressure beyond nominal, whereby both fuel economy and performance of the internal combustion engine are affected.
因此存在这样的需求，即获得内燃发动机运转中的故障对内燃发动机碳烟排放的影响的信息。There is therefore a need to obtain information on the effect of faults in the operation of an internal combustion engine on the soot emissions of the internal combustion engine.
另外，内燃发动机排气系统中NOx排放的“车上”测量开启了一系列新的可行方法，用来在内燃发动机运转过程中进行控制及故障诊断。虽然当前是使用传感器进行故障诊断，但也存在关于空气路径和燃料路径再循环调节的可行方法。In addition, the "on-board" measurement of NOx emissions in the exhaust system of internal combustion engines opens up a series of new possibilities for control and fault diagnosis during operation of internal combustion engines. While sensors are currently used for fault diagnosis, there are also possible approaches for air path and fuel path recirculation adjustments.
此时便出现了一个问题，即在“车上”故障诊断的框架内，由于就从同一个出发点到同一个目的地的试车驾驶而言，第一个驾驶员可以根据其驾驶习惯产生与另一个驾驶员驾驶时不同的NOx排放和不同的燃料消耗，所以对于NOx临界值的限制是无意义的，例如，更有闯劲的驾驶风格会产生更高的NOx排放以及更多的燃料消耗。与之相反，对于规则试车驾驶周期，NOx排放和燃料消耗不依赖于驾驶风格，这是因为根据测试周期的定义，这种依赖关系局限于不同测试周期间之间的可接受的变化。At this time, a problem arises, that is, within the framework of "on-board" fault diagnosis, since the first driver can produce different results from the other driver according to his driving habits in terms of test driving from the same starting point to the same destination. A driver drives with different NOx emissions and different fuel consumption, so a limit on the NOx threshold is meaningless, eg a more aggressive driving style results in higher NOx emissions and more fuel consumption. In contrast, for regular test drive cycles, NOx emissions and fuel consumption do not depend on driving style, since this dependence is limited to acceptable variation between different test cycles by definition of the test cycle.
到当前为止，在现有技术情况下，就NOx排放而言，“车上”识别的应用既没有针对“车上”故障诊断，也没有针对内燃发动机运行的控制进行深入的研究。So far, in the state of the art, the application of "on-board" identification in terms of NOx emissions has not been studied in depth neither for "on-board" fault diagnosis nor for the control of the operation of the internal combustion engine.
发明内容Contents of the invention
本发明的目的在于，提供一种在内燃发动机运转过程中进行“车上”故障诊断的方法及装置，它们在碳烟排放和/或NOx排放方面实现了可靠的“车上”故障诊断，并且必要时实现适当的控制。The object of the present invention is to provide a method and device for "on-board" fault diagnosis during the operation of an internal combustion engine, which enable reliable "on-board" fault diagnosis in terms of soot emissions and/orNOx emissions, And implement appropriate controls when necessary.
该目的通过根据本发明的方法得以实现，并根据本发明的装置得以实现。This object is achieved by the method according to the invention and by the device according to the invention.
在内燃发动机运转过程中进行“车上”故障诊断的方法包括以下步骤：A method for "on-board" fault diagnosis during operation of an internal combustion engine includes the following steps:
基于空气路径和燃料路径的理论设置，确定排放参考值；Determine the emission reference value based on the theoretical settings of the air path and the fuel path;
确定当前工况下的当前排放值；Determine current emission values under current operating conditions;
确定索引值，其中该索引值对应于当前排放值在预定时间间隔上的积分与排放参考值在该时间间隔上的积分的商；以及determining an index value, wherein the index value corresponds to the quotient of the integration of the current emission value over the predetermined time interval and the integration of the emission reference value over the time interval; and
基于该索引值生成故障信号。A fault signal is generated based on the index value.
本发明尤其基于对排放参考值进行计算这一理念，该排放参考值可以是内燃发动机的碳烟排放或NOx排放的排放参考值，这在一定程度上表示排放水平的理论值，其中排放参考值用于“车上”故障诊断，必要时也用于排放控制。The invention is based, inter alia, on the idea of calculating an emission reference value, which may be a soot orNOx emission reference value for an internal combustion engine, which to some extent represents a theoretical value for the emission level, where the emission reference The values are used for "onboard" fault diagnosis and, if necessary, also for emission control.
根据本发明，作为空气路径和燃料路径的理论设置的函数，对碳烟排放的参考值(单位为mg/m3)进行计算，这样就可以顾及到车辆动力学(即瞬时修正)对稳定状态校准值的影响。According to the invention, reference values for soot emissions (in mg/m3 ) are calculated as a function of theoretical settings for air and fuel paths, so that vehicle dynamics (i.e. instantaneous corrections) to steady state are taken into account The effect of the calibration value.
根据一实施例，基于排气中的燃烧质量分数的参考值(Fexh，ref)确定排放参考值。此外，也可以基于排气中燃烧质量分数的值(Fexh，ref)确定当前工况下的当前排放值。According to an embodiment, the emission reference value is determined based on a reference value (Fexh,ref ) of the mass fraction burned in the exhaust gas. In addition, the current emission value under the current working condition can also be determined based on the value of the combustion mass fraction in the exhaust gas (Fexh, ref ).
对于给定的工况，在燃烧过程中产生的碳烟浓度主要取决于排气中的燃烧质量分数(Fexh)。对于碳烟排放的参考值，将计算排气中燃烧质量分数的参考值，用于空气路径和燃料路径的理论设置。由于富于进攻性或有闯劲的驾驶风格会引起更为显著的理论值修正(即由于瞬时修正的高通滤波会引起更大的偏差)，并引起理论设置和所测量数值之间更大的偏差(尤其涉及空气路径)，因此在这种情况下应对驾驶行为加以考虑。For a given working condition, the concentration of soot generated during combustion mainly depends on the combustion mass fraction (Fexh ) in the exhaust. For reference values for soot emissions, a reference value for the mass fraction of combustion in the exhaust gas is calculated for the theoretical setup of the air path and the fuel path. More significant corrections to theoretical values due to aggressive or aggressive driving styles (i.e. larger deviations due to high-pass filtering of instantaneous corrections) and greater deviations between theoretical settings and measured values (especially concerning the air path), so the driving behavior should be taken into account in this case.
根据一实施例，内燃发动机的排放控制取决于故障信号。According to an embodiment, the emission control of the internal combustion engine is dependent on the fault signal.
根据另一实施例，对空气路径和/或燃料路径的理论设置的修正取决于故障信号。According to another embodiment, the correction of the theoretical setting of the air path and/or the fuel path depends on the fault signal.
根据一实施例，针对故障信号的第一值域对空气路径的理论设置进行修正，以及针对故障信号的第二值域对燃料路径的理论设置进行修正，其中第二值域较之第一值域符合当前排放相对于排放参考值的更大偏差。According to an embodiment, the theoretical setting of the air path is corrected for a first value range of the fault signal, and the theoretical setting of the fuel path is corrected for a second value range of the fault signal, wherein the second value range is lower than the first value Domains correspond to larger deviations of current emissions relative to emission reference values.
根据本发明的另一方面，在内燃发动机运转过程中进行“车上”故障诊断的方法，其特征在于，所述方法包括基于空气路径和燃料路径的理论设置确定排放参考值；确定当前工况下的当前排放值；确定索引值，其中该索引值对应于所述当前排放值在预定时间间隔上的积分与所述排放参考值在该时间间隔上的积分的商；以及基于所述索引值生成故障信号，其中基于空气和燃料路径控制协调确定是否需要修正空气路径和/或燃料路径的理论设置，当存在较大的碳烟排放偏差时，对燃料路径的理论设置进行修正，当存在相对较小的碳烟排放的偏差时，对空气路径的理论设置进行修正。According to another aspect of the present invention, a method for "on-board" fault diagnosis during operation of an internal combustion engine is characterized in that the method includes determining emission reference values based on theoretical settings of air paths and fuel paths; determining current operating conditions The current emission value under; determining an index value, wherein the index value corresponds to the quotient of the integration of the current emission value over a predetermined time interval and the integration of the emission reference value over the time interval; and based on the index value Generate a fault signal, wherein based on the coordination of air and fuel path control, it is determined whether the theoretical setting of the air path and/or fuel path needs to be corrected. When there is a large soot emission deviation, the theoretical setting of the fuel path is corrected. When there is a relative For smaller soot emission deviations, the theoretical setting of the air path is corrected.
此外，本发明还涉及一种在内燃发动机运转过程中进行“车上”故障诊断的装置，该装置被设计用来实施按照上述权利要求所述的方法。该设备的优选实施例参照与该方法有关的上述实施例。Furthermore, the invention relates to a device for "on-board" fault diagnosis during operation of an internal combustion engine, which device is designed to carry out the method according to the preceding claims. For preferred embodiments of the device reference is made to the above-described embodiments in relation to the method.
本发明的其他实施例的更多细节参见说明书以及各从属权利要求。Further details of other embodiments of the invention are found in the description and in the respective dependent claims.
附图说明Description of drawings
下文将参照附图按照优选实施例对本发明进行更为详尽的说明。Hereinafter, the present invention will be described in more detail according to preferred embodiments with reference to the accompanying drawings.
图1是图示说明根据一实施例在使用碳烟排放情况下执行用于故障诊断的方法的示意图；FIG. 1 is a schematic diagram illustrating a method for fault diagnosis performed using soot emission according to an embodiment;
图2是图示说明根据本发明用来控制碳烟排放的方法的示意图；Figure 2 is a schematic diagram illustrating a method for controlling soot emissions according to the present invention;
图3是图示说明根据一实施例在使用NOx排放情况下执行用于故障诊断的方法的示意图；FIG. 3 is a schematic diagram illustrating a method for fault diagnosis performed using NOx emissions according to an embodiment;
图4是图示说明根据本发明用来控制NOx排放的方法的示意图。FIG. 4 is a schematic diagram illustrating a method for controlling NOx emissions according to the present invention.
具体实施方式Detailed ways
下面首先参照图1和图2，其示出了根据本发明在使用碳烟排放的情况下进行故障诊断或控制内燃发动机的方法的一种可能实施方式。Reference is first made below to FIGS. 1 and 2 , which show a possible embodiment of the method according to the invention for fault diagnosis or control of an internal combustion engine using soot emissions.
按照图1，基本上作为空气路径和/或燃料路径的理论设置的函数，对碳烟排放(单位为mg/m3)的参考值进行计算。According to FIG. 1 , reference values for soot emissions (in mg/m3 ) are calculated essentially as a function of the theoretical settings of the air path and/or fuel path.
如图1中示意所示，对于给定的工况，在燃烧过程中产生的碳烟浓度主要取决于排气中的燃烧质量分数(Fexh)。相应地，为了确定碳烟排放的参考值，需要计算排气中燃烧质量分数的参考值(Fexh，ref)，以用于空气路径和燃料路径的理论设置。As shown schematically in Fig. 1, for a given operating condition, the concentration of soot produced in the combustion process mainly depends on the combustion mass fraction (Fexh ) in the exhaust gas. Correspondingly, in order to determine the reference value of soot emission, it is necessary to calculate the reference value (Fexh,ref ) of the combustion mass fraction in the exhaust gas for the theoretical setting of the air path and the fuel path.
在燃料路径的理论设置非动态变化的情况下，主要基于排气中燃烧质量分数的参考值(Fexh，ref)计算碳烟排放的参考值，而排气中燃烧质量分数的参考值主要由不基于模型的空气路径控制情况下的MAF和MAP参考值计算得来。之后针对空气路径和燃料路径的理论设置中的内燃发动机排放，对碳烟排放的参考值进行估计。In the case of non-dynamic changes in the theoretical setting of the fuel path, the reference value of soot emission is mainly calculated based on the reference value (Fexh, ref ) of the combustion mass fraction in the exhaust gas, which is mainly determined by MAF and MAP reference values calculated without model-based air path control. Reference values for soot emissions are then estimated for internal combustion engine emissions in theoretical settings for the air path and fuel path.
出于“车上”故障诊断的目的，按照图1，将计算的当前碳烟排放在预定时间间隔上进行积分，并除以该碳烟排放的参考值在预定时间间隔上的积分。这里所用的时间间隔的选择对于柴油颗粒过滤器中用于下一个运转周期的预校准质量分数的时间范围而言是十分重要的，以确保正确无误的故障诊断。For the purpose of "on-board" fault diagnosis, according to Fig. 1, the calculated current soot emission is integrated over a predetermined time interval and divided by the integral of the reference value of soot emission over a predetermined time interval. The choice of the time interval used here is very important for the time range of the pre-calibrated mass fraction in the DPF for the next operating cycle to ensure correct fault diagnosis.
由此计算出的索引值将与用于故障诊断的OBD临界索引值进行对比(OBD临界索引值，OBD＝“车上诊断”)，其中该OBD临界索引值对应于OBD临界值(单位为克每运转周期)与碳烟排放参考值(单位为克每运转周期)的积分的商。对于数值超出OBD临界索引值的情况，将通过故障诊断显示故障信息并输出故障信号。The index value thus calculated will be compared with the OBD critical index value used for fault diagnosis (OBD critical index value, OBD="on-board diagnosis"), wherein the OBD critical index value corresponds to the OBD critical value (unit is gram The quotient of the integral of the soot emission reference value (unit: gram per operating cycle) per operating cycle). For the situation that the value exceeds the OBD critical index value, the fault information will be displayed and the fault signal will be output through fault diagnosis.
按照图2，碳烟标位的参考值与碳烟排放的当前值之间的偏差被用来生成故障信号。该故障信号将按下文所述在空气和燃料路径结构中得以应用：According to FIG. 2 , the deviation between the reference value of the soot level and the current value of the soot emission is used to generate a fault signal. This fault signal will be applied in the air and fuel path structure as follows:
空气和燃料路径控制协调确定是否需要修正空气路径和/或燃料路径的理论设置，以便将碳烟排放的参考值与碳烟排放的计算值之间的偏差置于可接受的公差范围之内。The air and fuel routing control coordination determines whether the theoretical settings of the air routing and/or the fuel routing need to be corrected to bring the deviation between the reference value of the soot emission and the calculated value of the soot emission within an acceptable tolerance range.
根据内燃发动机的运转范围，针对较大的碳烟排放偏差(即，在需要快速动态的情况下)对燃料路径的理论设置进行修正。在碳烟排放的偏差相对较小的情况下，以及参考值与空气路径的当前理论设置之间追随良好的情况下，对空气路径的理论设置进行修正。Depending on the operating range of the internal combustion engine, the theoretical setting of the fuel path is corrected for larger soot emission deviations (ie in cases where fast dynamics are required). In the case of relatively small deviations in soot emissions and good tracking between the reference value and the current theoretical setting of the air path, the theoretical setting of the air path is corrected.
可选地，在空气路径的闭路(“闭环”)反馈控制中能够直接应用碳烟故障信号，以控制空气路径的调节。当运行发生在NOx碳烟修正曲线的另一个工作点上时，运用这种方法进行控制的可行性由于与NOx排放值相关联而受到限制，该NOx排放值的公差范围由NOx排放的OBD临界值来给定。Alternatively, the soot fault signal can be applied directly in a closed loop ("closed loop") feedback control of the air path to control the regulation of the air path. When operation occurs at another operating point of the NOx soot correction curve, the feasibility of using this method of control is limited due to the link to the NOx emission value whose tolerance range is determined by the OBD threshold for NOx emissions. value to give.
据此，如果碳烟排放的“车上”控制和/或监控是期望的或必要的，任意排气后处理部件的模型也可以被包括在内以用于估计碳烟排放，该部件会影响排气管内(以及监控位置上)的碳烟含量，例如任意柴油颗粒过滤器催化剂元件，它会将进气口上的碳烟颗粒储存在柴油颗粒过滤器的入口上并加以转化。类似地，可以使用当前碳烟排放的模型，用来在监控位置对碳烟排放进行评估，然而在这种情况下是按照直接“车上”测量和/或适合的估计算法。这能够对应于与碳烟排放的参考值相关而被应用的估计算法，然而在此处需要以空气路径和燃料路径的当前测量值(MAF，MAP，排气Lambda值、进气Lambda值)为基础并对其加以应用。Accordingly, if "on-board" control and/or monitoring of soot emissions is desired or necessary, models of any exhaust aftertreatment components may also be included for estimating soot emissions that would affect Soot levels in the exhaust (and at monitoring locations), such as any DPF catalyst element, which stores and converts soot particles from the air intake on the DPF inlet. Similarly, a model of the current soot emission can be used for the evaluation of the soot emission at the monitoring location, however in this case according to direct "on-board" measurements and/or suitable estimation algorithms. This can correspond to an estimation algorithm that is applied in relation to a reference value for soot emissions, however here the current measured values (MAF, MAP, exhaust lambda, intake lambda) of the air path and fuel path are required as base and apply it.
参照图1所示的用于“车上”故障诊断的上述方法也能够类似地用于NOx排放的排放参考值。下面，首先参照图3和图4说明根据本发明在使用NOx排放的情况下进行故障诊断及控制内燃发动机的方法的一种可能实施方式。The method described above for "on-board" fault diagnosis with reference to FIG. 1 can also be used analogously for emission reference values for NOx emissions. In the following, a possible embodiment of a method for fault diagnosis and control of an internal combustion engine according to the present invention using NOx emissions will be described first with reference to FIGS. 3 and 4 .
在此，基于以下步骤计算NOx排放的参考值：估计未燃烧的NOx的排放，利用排气后处理部件的简化阶的热力学模型，以及估计下游的NOx排放。Here, a reference value for NOx emissions is calculated based on estimating unburned NOx emissions, using a simplified order thermodynamic model of the exhaust aftertreatment components, and estimating downstream NOx emissions.
按照图3所示，针对给定的工况，根据排气中的燃烧质量分数(Fexh)确定在燃烧过程中产生的NOx浓度。相应地，需要针对空气和燃料路径的理论设置计算出排气中燃烧质量分数的参考值(Fexh，ref)，从而确定NOx浓度的参考值。As shown in FIG. 3 , for a given working condition, the concentration of NOx produced in the combustion process is determined according to the combustion mass fraction (Fexh ) in the exhaust gas. Correspondingly, it is necessary to calculate the reference value (Fexh, ref ) of the combustion mass fraction in the exhaust gas for the theoretical setting of the air and fuel paths, so as to determine the reference value of the NOx concentration.
之后针对空气路径和燃料路径的理论设置中的内燃发动机排放，对碳烟排放的参考值进行估计。在燃料路径的理论设置非动态变化的情况下，主要基于排气中燃烧质量分数的参考值(Fexh，ref)计算NOx浓度的参考值，而排气中燃烧质量分数的参考值主要由不基于模型的空气路径控制情况下的MAF和MAP参考值计算得来。之后针对空气路径和燃料路径的理论设置中的内燃发动机排放，对NOx浓度的参考值进行估计。Reference values for soot emissions are then estimated for internal combustion engine emissions in theoretical settings for the air path and fuel path. In the case of a non-dynamic change in the theoretical setting of the fuel path, the reference value of the NOx concentration is mainly calculated based on the reference value (Fexh, ref ) of the mass fraction burned in the exhaust gas, which is mainly determined by different MAF and MAP reference values are calculated based on model-based air path control. A reference value for the NOx concentration is then estimated for internal combustion engine emissions in a theoretical setting for the air path and fuel path.
出于“车上”故障诊断的目的，按照图3，将计算的当前NOx排放在预定时间间隔上进行积分，并除以该NOx排放的参考值在预定时间间隔上的积分。这里所用的时间间隔的选择对于柴油颗粒过滤器中用于下一个运转周期的预校准质量分数的时间范围而言是十分重要的，以确保正确无误的故障诊断。For "on-board" fault diagnosis purposes, according to FIG. 3 , the calculated current NOx emissions are integrated over predetermined time intervals and divided by the integration of the reference value of NOx emissions over predetermined time intervals. The choice of the time interval used here is very important for the time range of the pre-calibrated mass fraction in the DPF for the next operating cycle to ensure correct fault diagnosis.
对于数值超出OBD临界索引值的情况，将通过故障诊断显示故障信息并输出故障信号。由此计算出的索引值将与用于故障诊断的OBD临界索引值进行对比(OBD临界索引值，OBD＝“车上诊断”)，其中该OBD临界索引值对应于OBD临界值(单位为克每运转周期)与NOx排放参考值(单位为克每运转周期)的积分的商。对于数值超出OBD临界索引值的情况，将通过故障诊断显示故障信息并输出故障信号。For the situation that the value exceeds the OBD critical index value, the fault information will be displayed and the fault signal will be output through fault diagnosis. The index value thus calculated will be compared with the OBD critical index value used for fault diagnosis (OBD critical index value, OBD="on-board diagnosis"), wherein the OBD critical index value corresponds to the OBD critical value (unit is gram The quotient of the integral of the NOx emission reference value (in grams per operating cycle) per operating cycle). For the situation that the value exceeds the OBD critical index value, the fault information will be displayed and the fault signal will be output through fault diagnosis.
按照图4，NOx排放的参考值与NOx排放的当前值之间的偏差被用来生成故障信号。该故障信号将按下文所述在空气和燃料路径机构中得以应用：According to FIG. 4 , the deviation between the reference value of NOx emissions and the current value of NOx emissions is used to generate a fault signal. This fault signal will be applied in the air and fuel path mechanisms as follows:
空气和燃料路径控制协调确定是否需要修正空气路径和/或燃料路径的理论设置，以便将NOx排放的参考值与NOx排放的计算值之间的偏差置于可接受的公差范围之内。The air and fuel routing controls coordinate to determine whether the theoretical settings of the air routing and/or the fuel routing need to be corrected to bring the deviation between the reference value of NOx emissions and the calculated value of NOx emissions within an acceptable tolerance range.
根据内燃发动机的运转范围，针对较大的NOx排放偏差(即，在需要快速动态的情况下)对燃料路径的理论设置进行修正。在NOx排放的偏差相对较小的情况下，以及参考值与空气路径的当前理论设置之间追随良好的情况下，对空气路径的理论设置进行修正。Depending on the operating range of the internal combustion engine, the theoretical setting of the fuel path is corrected for larger deviations in NOx emissions (ie in cases where fast dynamics are required). In the case of relatively small deviations in NOx emissions and good tracking between the reference value and the current theoretical setting of the air path, the theoretical setting of the air path is corrected.
可选地，在空气路径的闭路(“闭环”)反馈控制中能够直接应用NOx故障信号，以控制空气路径的设置。Alternatively, the NOx fault signal can be applied directly in a closed loop ("closed loop") feedback control of the air path to control the air path settings.
据此，如果NOx排放的“车上”控制和/或监控是期望的或必要的，任意排气后处理部件的模型也可以被包括在内以用于估计NOx排放，该部件会影响排气管内(以及监控位置上)的NOx排放，例如任意柴油颗粒过滤器催化剂元件，它会将进气口上的NOx排放储存在柴油颗粒过滤器的入口上并加以转化。类似地，可以使用当前NOx排放的模型，用来在监控位置对NOx排放进行评估的模型，然而在这种情况下是按照直接“车上”测量和/或适合的估计算法。这能够对应于与NOx排放的参考值相关而被应用的估计算法，然而在此处需要以空气路径和燃料路径的当前测量值(MAF，MAP，排气Lambda值，进气Lambda值)为基础并对其加以应用。Accordingly, if "on-board" control and/or monitoring of NOx emissions is desired or necessary, models of any exhaust aftertreatment components that affect exhaust NOx emissions in-line (and at the monitoring location), such as any DPF catalyst element, which will store and convert NOx emissions on the intake on the DPF inlet. Similarly, a model of the current NOx emissions can be used, a model for the assessment of NOx emissions at the monitoring location, however in this case according to direct "on-board" measurements and/or a suitable estimation algorithm. This can correspond to an estimation algorithm that is applied in relation to a reference value for NOx emissions, but here needs to be based on current measurements of the air and fuel paths (MAF, MAP, Exhaust Lambda, Intake Lambda) and apply it.
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| DE102009054817.3 | 2009-12-17 | ||
| DE102009054817ADE102009054817A1 (en) | 2009-12-17 | 2009-12-17 | Method for on-board error diagnosis in operation of internal combustion engine of motor vehicle, involves determining actual emission value in actual operating condition, and generating error signal based on index value |
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| CN201010586026.0AExpired - Fee RelatedCN102102565B (en) | 2009-12-17 | 2010-12-09 | Method and device for on-board error diagnosis in operation of internal combustion engine of motor vehicle |
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