EGR cooler fault warning method

Abstract

The present invention relates to an EGR cooler fault warning method, which collects working condition data and the temperature difference before and after the EGR cooler, calculates the cooling efficiency of the EGR cooler, and judges the health status of the EGR cooler through data analysis and degradation identification, and then sends it to the instrument to remind the user to enter the station for maintenance in time, so as to avoid damage to the EGR cooler and reduce maintenance costs.

Description

Technical Field

[0001] The invention relates to an EGR cooler, and in particular to an EGR cooler fault early warning method. Background Art

[0002] During the operation of a diesel engine, the cooling efficiency of the EGR cooler will gradually decrease. The common reasons are: Generally, since the high-temperature exhaust gas needs to be cooled by the EGR cooler before passing through the cold-end EGR valve and entering the intake pipe to mix with fresh air, the soot in the exhaust gas is deposited in the EGR cooler after cooling, resulting in a decrease in the cooling efficiency of the EGR cooler; leakage may also occur, resulting in a decrease in cooling efficiency.

[0003] In the prior art, there is no EGR cooler fault warning method, and the fault can only be reported when the EGR cooler efficiency exceeds the OBD regulatory limit. After the EGR cooler is severely fouled or leaks, the EGR cooler low efficiency fault is reported. At this time, the EGR cooler is severely damaged and the maintenance cost is high. There is no continuous feedback of the fault status of the EGR cooler deterioration process. Summary of the invention

[0004] To solve the above problems, the present invention provides an EGR cooler fault warning method, which can judge the health status of the EGR cooler in real time, remind the user to enter the station for maintenance in time, avoid damage to the EGR cooler, and reduce maintenance costs.

[0005] The technical solution adopted by the present invention is: an EGR cooler fault warning method, characterized in that it includes the following steps: A. T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow rate and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0006] B. The data platform performs network-side data processing: signal filtering, calculation of EGR cooling efficiency and engine status identification. The EGR cooling efficiency is calculated only when the engine status meets certain requirements: reaching a certain load to avoid the situation where the measured value and model value of the EGR cooler outlet temperature deviate too little when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine status must be stable to ensure the effectiveness of the EGR cooling efficiency calculation;

[0007] C. The data platform determines the degradation level of the EGR cooler;

[0008] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light-on message to the vehicle instrument panel.

[0009] Preferably, in step A): when the ECU is powered on and the engine speed is greater than 0, the T-BOX starts to collect engine sensor and model value information and uploads it to the data platform.

[0010] Preferably, in step B), the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are filtered to perform real-time calculation of the EGR cooling efficiency.

[0011] Furthermore, the real-time calculation formula of EGR cooling efficiency is:

[0012] EGR cooling efficiency = (EGR cooler inlet temperature - EGR cooler outlet temperature measured value) / (EGR cooler inlet temperature - EGR cooler outlet temperature model value).

[0013] Preferably, in step B), the vehicle speed, engine speed, coolant temperature, turbine inlet temperature and change rate, EGR exhaust gas flow rate and change rate, and temperature difference before and after the EGR cooler are used to determine whether the currently calculated EGR cooling efficiency is effective and whether it can be used to determine the health level of the EGR cooler after filtering.

[0014] Further, the specific requirements are:

[0015] The vehicle speed is greater than or equal to 0km / h;

[0016] The engine speed is greater than or equal to 1180 rpm;

[0017] The coolant temperature is in the range of [70,95]℃;

[0018] The turbine inlet temperature is in the range of [300,1000]℃;

[0019] The temperature difference before and after the EGR cooler is in the range of [200,500]℃;

[0020] EGR exhaust gas flow rate is greater than 12g / s;

[0021] The turbine inlet temperature change rate is in the range of [-40,40]℃;

[0022] The EGR exhaust gas flow rate change rate is within the range of [-5,5]g / s;

[0023] All the above conditions support calibration, and the above conditions must be met at the same time. The main purpose is to judge the EGR cooling efficiency at higher speeds and higher loads. At this time, the engine exhaust temperature is higher and the EGR cooling efficiency is higher. If the EGR cooling efficiency decreases, it is easier to find. In addition, the turbine inlet temperature change rate and the EGR exhaust gas flow rate change rate need to be delayed. The main purpose is to eliminate the sudden change of EGR cooling efficiency caused by the rapid change of working conditions and reduce misjudgment.

[0024] Preferably, in steps C) and D), when the data platform determines that the EGR cooling efficiency is effective, the calculated value of the EGR cooling efficiency will be compared with the three alarm thresholds, and then a light signal will be sent to the T-BOX, which will then forward it to the vehicle instrument panel to tell the user the current health status of the EGR cooler of the vehicle by lighting the light.

[0025] Furthermore, when the EGR cooling efficiency is between [B, A], it is determined that the EGR cooler is working properly, and the data platform sends a green light signal to the T-BOX, and then the T-BOX forwards the message to the instrument, and the instrument lights up green at this time;

[0026] When the EGR cooling efficiency is between [C, B], it is determined that the EGR cooler is attenuated, and the data platform sends a yellow light signal to the T-BOX, which then forwards the message to the instrument, and the instrument lights up yellow at this time;

[0027] When the EGR cooling efficiency is less than C, it is judged that the EGR cooler is seriously attenuated, and the data platform sends a red light signal to the T-BOX, and then the T-BOX forwards the message to the instrument, and the instrument lights up red at this time;

[0028] The A / B / C values ​​can be calibrated by the OEM.

[0029] Preferably, in step D), the lighting principle is:

[0030] 1) Green: EGR cooling efficiency is normal and the vehicle can run normally;

[0031] 2) Yellow: EGR cooling efficiency is declining, reminding the user that there is carbon deposit in the EGR cooler. At this time, the user can choose to enter the station for maintenance or continue driving;

[0032] 3) Red: The EGR cooling efficiency is seriously insufficient, reminding the user that the EGR cooler is at risk of damage and needs to be repaired immediately.

[0033] Preferably, the specific steps of step C) are: before the monitoring efficiency drops significantly, only background data monitoring is performed; when the efficiency drops significantly and does not significantly affect the engine performance and emissions, the user is informed of the potential risks; when the efficiency drops significantly and significantly affects the performance and emissions, the user is advised to perform maintenance in advance.

[0034] The beneficial effects achieved by the present invention are: by collecting operating condition data and the temperature difference before and after the EGR cooler, the cooling efficiency of the EGR cooler is calculated, and the health status of the EGR cooler is judged through data analysis and degradation identification, and then sent to the instrument to remind the user to enter the station for maintenance in time, avoid damage to the EGR cooler, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the EGR cooler degradation state diagram;

[0036] Figure 2 It is a flowchart of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] like Figure 1-2 As shown, a method for early warning of EGR cooler failure comprises the following steps:

[0041] A. T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow rate and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0042] B. The data platform performs network-side data processing: signal filtering, calculation of EGR cooling efficiency and engine status identification. The EGR cooling efficiency is calculated only when the engine status meets certain requirements: reaching a certain load to avoid the situation where the measured value and model value of the EGR cooler outlet temperature deviate too little when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine status must be stable to ensure the effectiveness of the EGR cooling efficiency calculation;

[0043] C. The data platform determines the degradation level of the EGR cooler;

[0044] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light-on message to the vehicle instrument panel.

[0045] By collecting operating data and the temperature difference before and after the EGR cooler, the cooling efficiency of the EGR cooler is calculated, and the health status of the EGR cooler is judged through data analysis and degradation identification. The data is then sent to the instrument to remind the user to enter the station for maintenance in time to avoid damage to the EGR cooler and reduce maintenance costs.

[0046] Embodiment 1: A method for early warning of EGR cooler failure, comprising the following steps:

[0047] A. When the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform; T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0048] B. The data platform performs network-side data processing: signal filtering, calculation of EGR cooling efficiency and engine status identification. The EGR cooling efficiency is calculated only when the engine status meets certain requirements: reaching a certain load to avoid the situation where the measured value and model value of the EGR cooler outlet temperature deviate too little when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine status must be stable to ensure the effectiveness of the EGR cooling efficiency calculation;

[0049] C. The data platform determines the degradation level of the EGR cooler;

[0050] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light-on message to the vehicle instrument panel.

[0051] Embodiment 2: A method for early warning of EGR cooler failure, comprising the following steps:

[0052] A. When the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform; T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0053] B. The data platform performs network-side data processing: signal filtering, calculation of EGR cooling efficiency and engine state identification. The EGR cooling efficiency is calculated only when the engine state meets certain requirements: when the load reaches a certain level, the deviation between the measured value and the model value of the EGR cooler outlet temperature is too small when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine state must be stable to ensure the validity of the EGR cooling efficiency calculation; after filtering, the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are used to calculate the EGR cooling efficiency in real time;

[0054] C. The data platform determines the degradation level of the EGR cooler;

[0055] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light-on message to the vehicle instrument panel.

[0056] Embodiment 3: A method for early warning of EGR cooler failure, comprising the following steps:

[0057] A. When the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform; T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0058] B. The data platform performs network data processing: signal filtering, calculation of EGR cooling efficiency and engine state identification. The EGR cooling efficiency is calculated only when the engine state meets certain requirements: when the load reaches a certain level, the deviation between the measured value and the model value of the EGR cooler outlet temperature is too small when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine state is stable to ensure the validity of the EGR cooling efficiency calculation; after filtering, the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are used to calculate the EGR cooling efficiency in real time; the real-time calculation formula for the EGR cooling efficiency is:

[0059] EGR cooling efficiency = (EGR cooler inlet temperature - EGR cooler outlet temperature measured value) / (EGR cooler inlet temperature - EGR cooler outlet temperature model value);

[0060] C. The data platform determines the degradation level of the EGR cooler;

[0061] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light-on message to the vehicle instrument panel.

[0062] Embodiment 4: A method for early warning of EGR cooler failure, comprising the following steps:

[0063] A. When the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform; T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0064] B. The data platform performs network data processing: signal filtering, calculation of EGR cooling efficiency and engine state identification. The EGR cooling efficiency is calculated only when the engine state meets certain requirements: when the load reaches a certain level, the deviation between the measured value and the model value of the EGR cooler outlet temperature is too small when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine state is stable to ensure the validity of the EGR cooling efficiency calculation; after filtering, the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are used to calculate the EGR cooling efficiency in real time; the real-time calculation formula for the EGR cooling efficiency is:

[0065] EGR cooling efficiency = (EGR cooler inlet temperature - EGR cooler outlet temperature measured value) / (EGR cooler inlet temperature - EGR cooler outlet temperature model value);

[0066] Vehicle speed, engine speed, coolant temperature, turbine inlet temperature and change rate, EGR exhaust gas flow rate and change rate, and temperature difference before and after the EGR cooler are used to determine whether the currently calculated EGR cooling efficiency is effective after filtering, and whether it can be used to determine the health level of the EGR cooler;

[0067] C. The data platform determines the degradation level of the EGR cooler;

[0068] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light-on message to the vehicle instrument panel.

[0069] Embodiment 5: A method for early warning of EGR cooler failure, comprising the following steps:

[0070] A. When the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform; T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0071] B. The data platform performs network data processing: signal filtering, calculation of EGR cooling efficiency and engine state identification. The EGR cooling efficiency is calculated only when the engine state meets certain requirements: when the load reaches a certain level, the deviation between the measured value and the model value of the EGR cooler outlet temperature is too small when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine state is stable to ensure the validity of the EGR cooling efficiency calculation; after filtering, the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are used to calculate the EGR cooling efficiency in real time; the real-time calculation formula for the EGR cooling efficiency is:

[0072] EGR cooling efficiency = (EGR cooler inlet temperature - EGR cooler outlet temperature measured value) / (EGR cooler inlet temperature - EGR cooler outlet temperature model value);

[0073] Vehicle speed, engine speed, coolant temperature, turbine inlet temperature and change rate, EGR exhaust gas flow rate and change rate, and temperature difference before and after the EGR cooler are used to determine whether the currently calculated EGR cooling efficiency is effective and whether it can be used to determine the health level of the EGR cooler after filtering; the specific requirements are:

[0074] The vehicle speed is greater than or equal to 0km / h;

[0075] The engine speed is greater than or equal to 1180 rpm;

[0076] The coolant temperature is in the range of [70,95]℃;

[0077] The turbine inlet temperature is in the range of [300,1000]℃;

[0078] The temperature difference before and after the EGR cooler is in the range of [200,500]℃;

[0079] EGR exhaust gas flow rate is greater than 12g / s;

[0080] The turbine inlet temperature change rate is in the range of [-40,40]℃;

[0081] The EGR exhaust gas flow rate change rate is within the range of [-5,5]g / s;

[0082] All the above conditions support calibration, and the above conditions must be met at the same time. The main purpose is to judge the EGR cooling efficiency at higher speeds and higher loads. At this time, the engine exhaust temperature is higher and the EGR cooling efficiency is higher. If the EGR cooling efficiency decreases, it is easier to find. In addition, the turbine inlet temperature change rate and the EGR exhaust gas flow rate change rate need to be delayed. The main purpose is to eliminate the sudden change of EGR cooling efficiency caused by the rapid change of working conditions and reduce the misjudgment.

[0083] C. The data platform determines the degradation level of the EGR cooler;

[0084] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light-on message to the vehicle instrument panel.

[0085] Embodiment 6: A method for early warning of EGR cooler failure, comprising the following steps:

[0086] A. When the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform; T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0087] B. The data platform performs network data processing: signal filtering, calculation of EGR cooling efficiency and engine state identification. The EGR cooling efficiency is calculated only when the engine state meets certain requirements: when the load reaches a certain level, the deviation between the measured value and the model value of the EGR cooler outlet temperature is too small when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine state is stable to ensure the validity of the EGR cooling efficiency calculation; after filtering, the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are used to calculate the EGR cooling efficiency in real time; the real-time calculation formula for the EGR cooling efficiency is:

[0088] EGR cooling efficiency = (EGR cooler inlet temperature - EGR cooler outlet temperature measured value) / (EGR cooler inlet temperature - EGR cooler outlet temperature model value);

[0089] Vehicle speed, engine speed, coolant temperature, turbine inlet temperature and change rate, EGR exhaust gas flow rate and change rate, and temperature difference before and after the EGR cooler are used to determine whether the currently calculated EGR cooling efficiency is effective and whether it can be used to determine the health level of the EGR cooler after filtering; the specific requirements are:

[0090] The vehicle speed is greater than or equal to 0km / h;

[0091] The engine speed is greater than or equal to 1180 rpm;

[0092] The coolant temperature is in the range of [70,95]℃;

[0093] The turbine inlet temperature is in the range of [300,1000]℃;

[0094] The temperature difference before and after the EGR cooler is in the range of [200,500]℃;

[0095] EGR exhaust gas flow rate is greater than 12g / s;

[0096] The turbine inlet temperature change rate is in the range of [-40,40]℃;

[0097] The EGR exhaust gas flow rate change rate is within the range of [-5,5]g / s;

[0098] All the above conditions support calibration, and the above conditions must be met at the same time. The main purpose is to judge the EGR cooling efficiency at higher speeds and higher loads. At this time, the engine exhaust temperature is higher and the EGR cooling efficiency is higher. If the EGR cooling efficiency decreases, it is easier to find. In addition, the turbine inlet temperature change rate and the EGR exhaust gas flow rate change rate need to be delayed. The main purpose is to eliminate the sudden change of EGR cooling efficiency caused by the rapid change of working conditions and reduce the misjudgment.

[0099] C. The data platform determines the degradation level of the EGR cooler; when the data platform determines that the EGR cooling efficiency is effective, the calculated value of the EGR cooling efficiency will be compared with the three alarm thresholds;

[0100] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light-on message to the vehicle instrument panel, telling the user the current health status of the vehicle's EGR cooler by lighting the light.

[0101] Embodiment 7: A method for early warning of EGR cooler failure, comprising the following steps:

[0102] A. When the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform; T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0103] B. The data platform performs network data processing: signal filtering, calculation of EGR cooling efficiency and engine state identification. The EGR cooling efficiency is calculated only when the engine state meets certain requirements: when the load reaches a certain level, the deviation between the measured value and the model value of the EGR cooler outlet temperature is too small when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine state is stable to ensure the validity of the EGR cooling efficiency calculation; after filtering, the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are used to calculate the EGR cooling efficiency in real time; the real-time calculation formula for the EGR cooling efficiency is:

[0104] EGR cooling efficiency = (EGR cooler inlet temperature - EGR cooler outlet temperature measured value) / (EGR cooler inlet temperature - EGR cooler outlet temperature model value);

[0105] Vehicle speed, engine speed, coolant temperature, turbine inlet temperature and change rate, EGR exhaust gas flow rate and change rate, and temperature difference before and after the EGR cooler are used to determine whether the currently calculated EGR cooling efficiency is effective and whether it can be used to determine the health level of the EGR cooler after filtering; the specific requirements are:

[0106] The vehicle speed is greater than or equal to 0km / h;

[0107] The engine speed is greater than or equal to 1180 rpm;

[0108] The coolant temperature is in the range of [70,95]℃;

[0109] The turbine inlet temperature is in the range of [300,1000]℃;

[0110] The temperature difference before and after the EGR cooler is in the range of [200,500]℃;

[0111] EGR exhaust gas flow rate is greater than 12g / s;

[0112] The turbine inlet temperature change rate is in the range of [-40,40]℃;

[0113] The EGR exhaust gas flow rate change rate is within the range of [-5,5]g / s;

[0114] All the above conditions support calibration, and the above conditions must be met at the same time. The main purpose is to judge the EGR cooling efficiency at higher speeds and higher loads. At this time, the engine exhaust temperature is higher and the EGR cooling efficiency is higher. If the EGR cooling efficiency decreases, it is easier to find. In addition, the turbine inlet temperature change rate and the EGR exhaust gas flow rate change rate need to be delayed. The main purpose is to eliminate the sudden change of EGR cooling efficiency caused by the rapid change of working conditions and reduce the misjudgment.

[0115] C. The data platform determines the degradation level of the EGR cooler; when the data platform determines that the EGR cooling efficiency is effective, the calculated value of the EGR cooling efficiency will be compared with the three alarm thresholds;

[0116] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light message to the vehicle instrument panel, telling the user the current health status of the vehicle's EGR cooler by lighting the light:

[0117] When the EGR cooling efficiency is between [C, B], it is determined that the EGR cooler is attenuated, and the data platform sends a yellow light signal to the T-BOX, which then forwards the message to the instrument, and the instrument lights up yellow at this time;

[0118] When the EGR cooling efficiency is less than C, it is judged that the EGR cooler is seriously attenuated, and the data platform sends a red light signal to the T-BOX, and then the T-BOX forwards the message to the instrument, and the instrument lights up red at this time;

[0119] The A / B / C values ​​can be calibrated by the OEM.

[0120] Embodiment 8: An EGR cooler fault warning method comprises the following steps:

[0121] A. When the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform; T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0122] B. The data platform performs network data processing: signal filtering, calculation of EGR cooling efficiency and engine state identification. The EGR cooling efficiency is calculated only when the engine state meets certain requirements: when the load reaches a certain level, the deviation between the measured value and the model value of the EGR cooler outlet temperature is too small when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine state is stable to ensure the validity of the EGR cooling efficiency calculation; after filtering, the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are used to calculate the EGR cooling efficiency in real time; the real-time calculation formula for the EGR cooling efficiency is:

[0123] EGR cooling efficiency = (EGR cooler inlet temperature - EGR cooler outlet temperature measured value) / (EGR cooler inlet temperature - EGR cooler outlet temperature model value);

[0124] Vehicle speed, engine speed, coolant temperature, turbine inlet temperature and change rate, EGR exhaust gas flow rate and change rate, and temperature difference before and after the EGR cooler are used to determine whether the currently calculated EGR cooling efficiency is effective and whether it can be used to determine the health level of the EGR cooler after filtering; the specific requirements are:

[0125] The vehicle speed is greater than or equal to 0km / h;

[0126] The engine speed is greater than or equal to 1180 rpm;

[0127] The coolant temperature is in the range of [70,95]℃;

[0128] The turbine inlet temperature is in the range of [300,1000]℃;

[0129] The temperature difference before and after the EGR cooler is in the range of [200,500]℃;

[0130] EGR exhaust gas flow rate is greater than 12g / s;

[0131] The turbine inlet temperature change rate is in the range of [-40,40]℃;

[0132] The EGR exhaust gas flow rate change rate is within the range of [-5,5]g / s;

[0133] All the above conditions support calibration, and the above conditions must be met at the same time. The main purpose is to judge the EGR cooling efficiency at higher speeds and higher loads. At this time, the engine exhaust temperature is higher and the EGR cooling efficiency is higher. If the EGR cooling efficiency decreases, it is easier to find. In addition, the turbine inlet temperature change rate and the EGR exhaust gas flow rate change rate need to be delayed. The main purpose is to eliminate the sudden change of EGR cooling efficiency caused by the rapid change of working conditions and reduce the misjudgment.

[0134] C. The data platform determines the degradation level of the EGR cooler; when the data platform determines that the EGR cooling efficiency is effective, the calculated value of the EGR cooling efficiency will be compared with the three alarm thresholds;

[0135] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light message to the vehicle instrument panel. By lighting the light, the user is informed of the current health status of the vehicle's EGR cooler. The lighting principle is:

[0136] 1) Green: EGR cooling efficiency is normal and the vehicle can run normally;

[0137] 2) Yellow: EGR cooling efficiency is declining, reminding the user that there is carbon deposit in the EGR cooler. At this time, the user can choose to enter the station for maintenance or continue driving;

[0138] 3) Red: The EGR cooling efficiency is seriously insufficient, reminding the user that the EGR cooler is at risk of damage and needs to be repaired immediately;

[0139] When the EGR cooling efficiency is between [C, B], it is determined that the EGR cooler is attenuated, and the data platform sends a yellow light signal to the T-BOX, which then forwards the message to the instrument, and the instrument lights up yellow at this time;

[0140] When the EGR cooling efficiency is less than C, it is judged that the EGR cooler is seriously attenuated, and the data platform sends a red light signal to the T-BOX, and then the T-BOX forwards the message to the instrument, and the instrument lights up red at this time;

[0141] The A / B / C values ​​can be calibrated by the OEM.

[0142] Embodiment 9: A method for early warning of EGR cooler failure, comprising the following steps:

[0143] A. When the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform; T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow and coolant temperature, and T-Box forwards the relevant information to the data platform;

[0144] B. The data platform performs network data processing: signal filtering, calculation of EGR cooling efficiency and engine state identification. The EGR cooling efficiency is calculated only when the engine state meets certain requirements: when the load reaches a certain level, the deviation between the measured value and the model value of the EGR cooler outlet temperature is too small when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine state is stable to ensure the validity of the EGR cooling efficiency calculation; after filtering, the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are used to calculate the EGR cooling efficiency in real time; the real-time calculation formula for the EGR cooling efficiency is:

[0145] EGR cooling efficiency = (EGR cooler inlet temperature - EGR cooler outlet temperature measured value) / (EGR cooler inlet temperature - EGR cooler outlet temperature model value);

[0146] Vehicle speed, engine speed, coolant temperature, turbine inlet temperature and change rate, EGR exhaust gas flow rate and change rate, and temperature difference before and after the EGR cooler are used to determine whether the currently calculated EGR cooling efficiency is effective and whether it can be used to determine the health level of the EGR cooler after filtering; the specific requirements are:

[0147] The vehicle speed is greater than or equal to 0km / h;

[0148] The engine speed is greater than or equal to 1180 rpm;

[0149] The coolant temperature is in the range of [70,95]℃;

[0150] The turbine inlet temperature is in the range of [300,1000]℃;

[0151] The temperature difference before and after the EGR cooler is in the range of [200,500]℃;

[0152] EGR exhaust gas flow rate is greater than 12g / s;

[0153] The turbine inlet temperature change rate is in the range of [-40,40]℃;

[0154] The EGR exhaust gas flow rate change rate is within the range of [-5,5]g / s;

[0155] All the above conditions support calibration, and the above conditions must be met at the same time. The main purpose is to judge the EGR cooling efficiency at higher speeds and higher loads. At this time, the engine exhaust temperature is higher and the EGR cooling efficiency is higher. If the EGR cooling efficiency decreases, it is easier to find. In addition, the turbine inlet temperature change rate and the EGR exhaust gas flow rate change rate need to be delayed. The main purpose is to eliminate the sudden change of EGR cooling efficiency caused by the rapid change of working conditions and reduce the misjudgment.

[0156] C. The data platform determines the degradation level of the EGR cooler; when the data platform determines that the EGR cooling efficiency is effective, the calculated value of the EGR cooling efficiency will be compared with the three alarm thresholds; before the monitoring efficiency drops significantly, only background data monitoring is performed; when the efficiency drops significantly and does not significantly affect the engine performance and emissions, the user is informed of potential risks; when the efficiency drops significantly and significantly affects the performance and emissions, the user is advised to perform maintenance in advance;

[0157] D. The data platform sends an alarm signal to the T-BOX, and then the T-BOX forwards the light message to the vehicle instrument panel. By lighting the light, the user is informed of the current health status of the vehicle's EGR cooler. The lighting principle is:

[0158] 1) Green: EGR cooling efficiency is normal and the vehicle can run normally;

[0159] 2) Yellow: EGR cooling efficiency is declining, reminding the user that there is carbon deposit in the EGR cooler. At this time, the user can choose to enter the station for maintenance or continue driving;

[0160] 3) Red: The EGR cooling efficiency is seriously insufficient, reminding the user that the EGR cooler is at risk of damage and needs to be repaired immediately;

[0161] When the EGR cooling efficiency is between [C, B], it is determined that the EGR cooler is attenuated, and the data platform sends a yellow light signal to the T-BOX, which then forwards the message to the instrument, and the instrument lights up yellow at this time;

[0162] When the EGR cooling efficiency is less than C, it is judged that the EGR cooler is seriously attenuated, and the data platform sends a red light signal to the T-BOX, and then the T-BOX forwards the message to the instrument, and the instrument lights up red at this time;

[0163] The A / B / C values ​​can be calibrated by the OEM.

[0164] The above shows and describes the basic principles and main structural features of the present invention. The present invention is not limited to the above examples. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

[0165] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0166] The shapes, sizes, ratios, angles, and numbers disclosed for describing various aspects of the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the following description, when the detailed description of the related known functions or configurations is determined to be unnecessarily obscuring the focus of the present specification and claims, the detailed description will be omitted.

[0167] In the case of using “including”, “having” and “comprising” described in the present specification, unless otherwise used, there may also be another part or other parts, and the terms used may generally be in the singular but may also represent the plural form.

[0168] It should be noted that although the terms "first", "second", "top", "bottom", "one side", "the other side", "one end", "the other end", etc. may appear and be used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another component and part. For example, without departing from the scope of this specification, the first component can be called the second component, and similarly, the second component can be called the first component. The components at the top and bottom can also be swapped or converted with each other under certain circumstances; the components at one end and the other end can have the same or different performances.

[0169] When describing a positional relationship, for example, when the positional sequence is described as "on ...", "above ...", "below ..." and "next", unless words or terms such as "just" or "directly" are used, situations where they are not in contact or in contact may also be included. If it is mentioned that a first element is "on" a second element, it does not mean that the first element must be above the second element in the figure. The upper and lower parts of the component will change according to the change of the angle and orientation of observation. Therefore, in the drawings or in the actual construction, if it is involved that the first element is "on" the second element, the situation where the first element is "below" the second element and the situation where the first element is "above" the second element may be included. When describing a temporal relationship, unless "just" or "directly" is used, when describing "after", "subsequently", "subsequently" and "before", situations where the steps are not continuous may be included. The features of various embodiments of the present invention may be partially or completely combined or spliced ​​with each other, and may be performed in various different configurations as can be fully understood by those skilled in the art. The embodiments of the present invention may be performed independently of each other, or may be performed together in a mutually dependent relationship.

[0170] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. An EGR cooler fault warning method, Features: The following steps are involved: A. T-Box reads the vehicle controller information on the vehicle, including vehicle speed, engine speed, EGR cooler outlet temperature measurement value, EGR cooler outlet temperature model value, EGR cooler inlet temperature model value, EGR exhaust gas flow rate and coolant temperature, and T-Box forwards the relevant information to the data platform; B. The data platform performs network-side data processing: signal filtering, calculation of EGR cooling efficiency and engine status identification. The EGR cooling efficiency is calculated only when the engine status meets certain requirements: reaching a certain load to avoid the situation where the measured value and model value of the EGR cooler outlet temperature deviate too little when the exhaust temperature is too low, resulting in the calculation accuracy failing to meet the requirements; at the same time, the engine status must be stable to ensure the effectiveness of the EGR cooling efficiency calculation; C. The data platform determines the degradation level of the EGR cooler; before the monitoring efficiency drops significantly, only background data monitoring is performed; when the efficiency drops significantly but does not significantly affect the engine performance and emissions, the user is informed of potential risks; when the efficiency drops significantly and significantly affects the performance and emissions, the user is advised to perform maintenance in advance; D. The data platform sends an alarm signal to T-BOX, and then T-BOX forwards the light message to the vehicle instrument. When the data platform determines that the EGR cooling efficiency is effective, the calculated value of the EGR cooling efficiency will be compared with the three alarm thresholds, and then a light signal will be sent to T-BOX, which will then forward it to the vehicle instrument. By lighting the light, the user is informed of the current health status of the vehicle's EGR cooler. When the EGR cooling efficiency is between [B, A], the EGR cooler is judged to be working normally, and the data platform sends a green light signal to T-BOX, which then forwards the message to the instrument, and the instrument turns on the green light. When the EGR cooling efficiency is between [C, B], it is determined that the EGR cooler is attenuated, and the data platform sends a yellow light signal to the T-BOX, which then forwards the message to the instrument, and the instrument lights up yellow at this time; When the EGR cooling efficiency is less than C, it is judged that the EGR cooler is seriously attenuated, and the data platform sends a red light signal to the T-BOX, and then the T-BOX forwards the message to the instrument, and the instrument lights up red at this time; The A / B / C values ​​can be calibrated by the OEM; The lighting principle is: 1) Green: EGR cooling efficiency is normal and the vehicle can run normally; 2) Yellow: EGR cooling efficiency is declining, reminding the user that there is carbon deposit in the EGR cooler. At this time, the user can choose to enter the station for maintenance or continue driving; 3) Red: The EGR cooling efficiency is seriously insufficient, reminding the user that the EGR cooler is at risk of damage and needs to be repaired immediately.

2. The EGR cooler failure warning method according to claim 1, Features: In step A): when the ECU is powered on and the engine speed is greater than 0, T-BOX starts to collect engine sensor and model value information and upload it to the data platform.

3. The EGR cooler failure warning method according to claim 1, Features: In step B), the EGR cooler inlet temperature model value, the EGR cooler outlet temperature measurement value and the EGR outlet temperature model value are filtered to perform real-time calculation of the EGR cooling efficiency.

4. The EGR cooler failure warning method according to claim 1, Features: In step B), the vehicle speed, engine speed, coolant temperature, turbine inlet temperature and change rate, EGR exhaust gas flow rate and change rate, and temperature difference before and after the EGR cooler are used to determine whether the currently calculated EGR cooling efficiency is effective after filtering, and whether it can be used to determine the health level of the EGR cooler.

5. The EGR cooler failure warning method according to claim 4, Features: The specific requirements are: The vehicle speed is greater than or equal to 0km / h; The engine speed is greater than or equal to 1180 rpm; The coolant temperature is in the range of [70,95]℃; The turbine inlet temperature is in the range of [300,1000]℃; The temperature difference before and after the EGR cooler is in the range of [200,500]℃; EGR exhaust gas flow rate is greater than 12g / s; The turbine inlet temperature change rate is in the range of [-40,40]℃; The EGR exhaust gas flow rate change rate is within the range of [-5,5]g / s; The above conditions all support calibration. The above conditions must be met at the same time, and the turbine inlet temperature change rate and EGR exhaust gas flow rate change rate must be delayed.

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