DEVICE FOR DIAGNOSTICING A POST-TREATMENT SYSTEM

Abstract

Device for diagnosing an aftertreatment system, the device comprising: a first catalyst, an exhaust gas heat recovery system, and a second catalyst, which are sequentially arranged on an exhaust gas line. The device further comprises a main bypass line, an auxiliary bypass line, a first bypass valve, and a second bypass valve.The device further comprises a control device which is configured to determine, depending on whether a predetermined diagnostic condition is met, whether a first temperature sensor configured to measure a temperature of an exhaust gas on an upstream side of the first bypass valve, a second temperature sensor configured to measure a temperature of the exhaust gas on an upstream side of the exhaust gas heat recovery system, a third temperature sensor configured to measure a temperature of the exhaust gas on the downstream side of the exhaust gas heat recovery system, the first bypass valve and the second bypass valve are abnormal.

Description

BACKGROUND Technical area

[0001] The present disclosure / invention relates to a device for diagnosing a post-treatment system. Description of the related technology

[0002] There is a trend where the number of vehicles equipped with a traditional combustion engine is decreasing and the number of electric vehicles or low-emission hybrid vehicles is increasing, in accordance with global exhaust emission regulations.

[0003] Among these, the hybrid vehicle is a vehicle that uses two or more power sources, such as combustion engines and electric drive motors.

[0004] Since these hybrid vehicles have an electric drive motor that assists the combustion engine, the combustion engines used in hybrid vehicles are usually operated at their highest thermal efficiency (HTI) operating point (i.e., the point with the highest thermal efficiency) (or the optimal operating point). Achieving low-temperature combustion at the HTI operating point using a lean-burn mode reduces the combustion temperature, increasing the specific heat ratio and improving the efficiency of the hybrid vehicle.

[0005] In accordance with emission regulations, vehicles are equipped with catalytic converters which clean various harmful substances (e.g. pollutants) contained in exhaust gases (e.g., clean the exhaust gases of harmful substances, e.g., remove the harmful substances from the exhaust gas completely or at least partially).

[0006] A three-way catalyst (TWC) reduces carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) in the exhaust gas of a gasoline combustion engine. The three-way catalyst is activated above a certain temperature, whereby CO and HC are converted into harmless components through oxidation reactions, and NOx is converted into harmless components through reduction reactions. These three-way catalysts exhibit high thermal efficiency and low nitrogen oxide emission characteristics when the combustion engine is operated in its theoretical air-fuel ratio mode.

[0007] However, when the combustion engine is operated in lean-burn mode, the nitrogen oxide cleaning performance of the three-way catalytic converter deteriorates rapidly. Although nitrogen oxide emissions are low when the combustion engine is operated in lean-burn mode, they increase because the cleaning efficiency of the three-way catalytic converter is very low.

[0008] Because of these problems, additional catalysts, such as a nitrogen oxide trap (e.g. a lean NOx trap (LNT)) and / or selective catalytic reduction (SCR), are used to reduce nitrogen oxide-containing exhaust gases in combustion engines that use a lean combustion mode.

[0009] The LNT absorbs nitrogen oxides that are not cleaned by the three-way catalyst under lean operating conditions and reduces absorbed nitrogen oxides to nitrogen (N2) and releases them under rich operating conditions.

[0010] The SCR is a catalyst that purifies ammonia and nitrogen oxides into nitrogen and water by reacting them together on a catalyst. Although the method of injecting urea solution to introduce ammonia (NH3) is widespread, a method for purifying nitrogen oxides without urea, using NH3 generated from LNT in conjunction with LNT (e.g., passive SCR), is also employed.

[0011] However, the nitrogen oxide removal efficiency of LNT varies considerably depending on the catalyst temperature, exhibiting the highest removal efficiency between 250 and 350 degrees Celsius. Conversely, LNT catalysts are susceptible to damage at high temperatures (e.g., above 450 degrees Celsius), resulting in the release of nitrogen oxides without their reduction.

[0012] In gasoline combustion engines, the exhaust gas temperature exceeds 900 degrees Celsius under full load operating conditions, which worsens the cleaning efficiency of the LNT; however, it is necessary to maintain the temperature of the LNT at an appropriate level in a lean combustion mode.

[0013] Therefore, an aftertreatment system suitable for lean-burn combustion engines is being developed. These aftertreatment systems are equipped with various precision parts, and a procedure is needed to diagnose whether the various parts are functioning normally while the aftertreatment system is in operation.

[0014] The items described in the description of the related technology are created to improve the understanding of the background of the disclosure / invention and may include items that are not already known to a person skilled in the art in the field to which the present technology belongs. EXPLANATION

[0015] The present disclosure / invention provides a device for diagnosing an aftertreatment system which is capable of diagnosing whether a component part which is applied (e.g. used) in an aftertreatment system of a lean-burn internal combustion engine is abnormal.

[0016] In one embodiment of the present disclosure / invention, a device for diagnosing an aftertreatment system (e.g., for performing a diagnosis on an aftertreatment system, e.g., for examining an aftertreatment system to obtain a diagnosis) may comprise: a first catalyst, an exhaust gas heat recovery system, and a second catalyst, which are arranged on (e.g., along, e.g., in) an exhaust gas line (e.g., sequentially, e.g., in series, e.g., in the aforementioned order). The device further comprises a main bypass line, which branches off from the exhaust gas line between the first catalyst and the exhaust gas heat recovery system and which joins the exhaust gas line on a downstream side of the second catalyst (e.g., which merges with the exhaust gas line on a downstream side of the second catalyst). The device further comprises an auxiliary bypass line (e.g.,The device includes an auxiliary bypass line branching off from the exhaust line between the first catalyst and the exhaust heat recovery system, which then joins the exhaust line between the exhaust heat recovery system and the second catalyst (e.g., which merges with the exhaust line between the exhaust heat recovery system and the second catalyst). The device comprises a first bypass valve installed at the point where the exhaust line and the main bypass line merge (e.g., where they merge), and a second bypass valve installed at the point where the exhaust line and the auxiliary bypass line merge (e.g., where they merge).The device further comprises a control device configured to determine, based on whether a predetermined diagnostic condition is met, whether at least one of the following is abnormal: a first temperature sensor, a second temperature sensor, a third temperature sensor, the first bypass valve, or the second bypass valve. The first temperature sensor is configured to measure the temperature of an exhaust gas on the upstream side of the first bypass valve, the second temperature sensor is configured to measure the temperature of the exhaust gas on the upstream side of the exhaust gas heat recovery system, and the third temperature sensor is configured to measure the temperature of the exhaust gas on the downstream side of the exhaust gas heat recovery system.

[0017] The predetermined diagnostic condition may include a preliminary diagnostic condition to verify the validity of the first through third temperature sensors. The predetermined diagnostic condition may further include: a first diagnostic condition to diagnose whether the first temperature sensor is abnormal, a second diagnostic condition to diagnose whether the second temperature sensor is abnormal, a third diagnostic condition to diagnose whether the third temperature sensor is abnormal, a fourth diagnostic condition to diagnose whether the first bypass valve is abnormal, and a fifth diagnostic condition to diagnose whether the exhaust gas heat recovery system is abnormal.

[0018] The preliminary diagnostic condition can be met if the idle time of an internal combustion engine is greater than or equal to a predetermined time. The first diagnostic condition is met if the temperature measured by the first to third temperature sensors while the preliminary diagnostic condition is met is / is / has been provisionally verified to be valid, and the internal combustion engine is running. The second diagnostic condition is met if it is / is determined that the first temperature sensor is normal, the internal combustion engine is running, and the exhaust gas temperature on the upstream side of the first bypass valve is greater than or equal to a first predetermined temperature while the first diagnostic condition is met.The third diagnostic condition is met when it is determined that the second temperature sensor is normal, the combustion engine is running, and the exhaust gas temperature on the upstream side of the exhaust gas heat recovery system is higher than or equal to a second predetermined temperature, and the first bypass valve is open while the second diagnostic condition is met. The fourth diagnostic condition is met when it is determined that the third temperature sensor is normal, the combustion engine is running, and the exhaust gas temperature on the upstream side of the exhaust gas heat recovery system is higher than or equal to a third predetermined temperature while the third diagnostic condition is met.The fifth diagnostic condition is met when it is determined that the first bypass valve and the second temperature sensor are normal, the combustion engine is running, and the exhaust gas temperature on the upstream side of the exhaust heat recovery system is higher than or equal to the third predetermined temperature, while the fourth diagnostic condition is met.

[0019] If the first diagnostic condition is met, the control device can be configured to determine if the first temperature sensor is abnormal by comparing a difference between the exhaust gas temperature measured by the first temperature sensor and a modeled temperature.

[0020] If the difference between the exhaust gas temperature measured by the first temperature sensor and the modeling temperature is less than a second reference temperature, the control device determines that the first temperature sensor is normal.

[0021] If the difference between the exhaust gas temperature measured by the first temperature sensor and the modeling temperature is greater than or equal to a second reference temperature, the control device may determine that the first temperature sensor is abnormal.

[0022] If the second diagnostic condition is met, the control device can determine whether the second temperature sensor is abnormal by comparing the exhaust gas temperature measured by the first temperature sensor with the exhaust gas temperature measured by the second temperature sensor.

[0023] If the temperature of the exhaust gas measured by the first temperature sensor is higher than or equal to the temperature of the exhaust gas measured by the second temperature sensor, (then) the control device can determine that the second temperature sensor is normal.

[0024] If the temperature of the exhaust gas measured by the first temperature sensor is lower than the temperature of the exhaust gas measured by the second temperature sensor, (then) the control device can determine that the second temperature sensor is abnormal.

[0025] If the third diagnostic condition is met, (then) the control device can be configured to compare the exhaust gas temperature measured by the second temperature sensor with the exhaust gas temperature measured by the third temperature sensor to determine if the third temperature sensor is abnormal.

[0026] If the exhaust gas temperature measured by the second temperature sensor is higher than or equal to the exhaust gas temperature measured by the third temperature sensor, the control device can determine that the third temperature sensor is normal.

[0027] If the exhaust gas temperature measured by the second temperature sensor is lower than the exhaust gas temperature measured by the third temperature sensor, the control device can determine that the third temperature sensor is abnormal.

[0028] If the fourth diagnostic condition is met, the control device can be configured to: apply a control signal (e.g., to close the first bypass valve), compare the exhaust gas temperature measured by the first temperature sensor with the exhaust gas temperature measured by the second temperature sensor, compare the exhaust gas temperature measured by the second temperature sensor with the exhaust gas temperature measured by the third temperature sensor, and determine whether the first bypass valve and the second temperature sensor are abnormal.

[0029] If the difference between the exhaust gas temperature measured by the first temperature sensor and the exhaust gas temperature measured by the second temperature sensor is lower than a third reference temperature, and the difference between the exhaust gas temperature measured by the second temperature sensor and the exhaust gas temperature measured by the third temperature sensor is greater than or equal to a fourth reference temperature, the control device can determine that the first bypass valve is normal.

[0030] If the difference between the exhaust gas temperature measured by the first temperature sensor and the exhaust gas temperature measured by the second temperature sensor is greater than or equal to a third reference temperature, and if the difference between the exhaust gas temperature measured by the second temperature sensor and the exhaust gas temperature measured by the third temperature sensor is less than a fourth reference temperature, the control device can determine that the first bypass valve is abnormal.

[0031] If the difference between the exhaust gas temperature measured by the first temperature sensor and the exhaust gas temperature measured by the second temperature sensor is greater than or equal to a third reference temperature, and if the difference between the exhaust gas temperature measured by the second temperature sensor and the exhaust gas temperature measured by the third temperature sensor is greater than or equal to a fourth reference temperature, the control device can determine that the second temperature sensor is abnormal.

[0032] If the fifth diagnostic condition is met, the control device can determine, based on the exhaust gas temperature measured by the third temperature sensor range (e.g., by the third temperature sensor), whether the second bypass valve and the third temperature sensor are abnormal.

[0033] If the exhaust gas temperature measured by the third temperature sensor is lower than a fifth reference temperature and higher than or equal to a sixth reference temperature, the control device may be configured to determine that the exhaust gas heat recovery system is normal.

[0034] If the exhaust gas temperature measured by the third temperature sensor is lower than the fifth reference temperature and higher than or equal to the sixth reference temperature, the control device can determine that the second bypass valve is abnormal.

[0035] If the exhaust gas temperature measured by the third temperature sensor is lower than the sixth reference temperature, the control device can determine that the third temperature sensor is abnormal.

[0036] According to one embodiment of the present disclosure / invention, it is possible to diagnose, based on the first to third measured temperatures, whether the first to third temperature sensors as well as the first and second bypass valves are abnormal.

[0037] Further effects that can be achieved or are predicted by means of an embodiment of the present disclosure / invention are explicitly or implicitly described in a detailed description of the present disclosure / invention. In other words, various effects that are predicted according to an embodiment of the present disclosure / invention are described in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] These drawings serve as a reference when describing an embodiment of the present disclosure / invention, and the technical content of the present disclosure / invention should not be interpreted as being limited to the accompanying drawings. Fig. Figure 1 is a schematic view showing a configuration of the vehicle to which an aftertreatment system according to an embodiment of the present disclosure / invention is applied (e.g., in which such a system is used). Fig. Figure 2 is a block diagram showing a configuration of a post-treatment system according to an embodiment of the present disclosure / invention. Fig. 3, Fig. 4 to Fig. Figure 5 are operational illustrations to explain the operation of a post-treatment system according to an embodiment of the present disclosure / invention. Fig. Figure 6 is a flowchart showing a method for diagnosing (e.g., examining) a post-treatment system according to an embodiment of the present disclosure / invention. Fig. Figure 7 is a flowchart showing a method for preliminary verification of the validity of a first temperature sensor up to a third temperature sensor of a post-treatment system according to an embodiment of the present disclosure / invention. Fig. 8A- Fig. 8B are diagrams that illustrate the diagnostic procedure from Fig. 7 explain. Fig. Figure 9 is a flowchart showing a method for diagnosing whether a first temperature sensor of a post-treatment system according to an embodiment of the present disclosure / invention is abnormal. Fig. Figure 10 is a flowchart showing a method for diagnosing whether a second temperature sensor of a post-treatment system according to an embodiment of the present disclosure / invention is abnormal. Fig. Figure 11 is a flowchart showing a method for diagnosing whether a third temperature sensor of a post-treatment system according to an embodiment of the present disclosure / invention is abnormal. Fig. Figure 12 is a flowchart showing a method for diagnosing whether a first bypass valve and a second temperature sensor of a post-treatment system according to an embodiment of the present disclosure / invention are abnormal. Fig. 13A- Fig. 13B are diagrams which illustrate the diagnostic procedure from Fig. 12 explain. Fig. Figure 14 is a flowchart showing a method for diagnosing whether a second bypass valve and a third temperature sensor of a post-treatment system according to an embodiment of the present disclosure / invention are abnormal. Fig. 15A- Fig. 15B are diagrams illustrating the diagnostic procedure from Fig. 14 explain. Fig. Figure 16 is a representation which explains a computing device according to an embodiment of the present disclosure / invention.

[0039] It should be understood that the drawings mentioned above are not necessarily to scale and show a somewhat simplified representation of various example features / properties, which serve to illustrate the basic principles of the disclosure / invention. The specific design features / properties of the present disclosure / invention, including, for example, specific dimensions, orientations, positions, and shapes, are partly determined / defined by the respective intended application and usage environment. DETAILED DESCRIPTION

[0040] The terminology used herein serves only to describe certain embodiments and is not intended to be limiting to the present disclosure / invention. As used herein, unless the context clearly indicates otherwise, singular forms are intended to include plural forms. Furthermore, it should be understood that the terms "has" and / or "having" when used in this description indicate the presence of specified features / properties, (integers), steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features / properties, (integers), steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any or all combinations of one or more related elements.

[0041] When a component, control device, apparatus, element, device, or the like of the present disclosure / invention is described as having a purpose or performing an operation, function, or the like, the component, control device, apparatus, element, device, or the like herein shall be understood as being "configured to" fulfill that purpose or perform that operation or function. Each component, unit, control device, apparatus, element, device, and the like may separately embody or be contained within / as part of the apparatus a processor and memory, such as a non-volatile, computer-readable medium.

[0042] In the present disclosure / invention, expressions such as "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", "at least one of A, B or C" and "at least one of A, B or C or a combination thereof" can include any or all possible combinations of the elements listed together in the corresponding expression.

[0043] Furthermore, it is understood that one or more of the procedures or aspects thereof described below can be performed by at least one control device. The term "control device" can refer to a hardware device comprising memory and a processor. The memory is configured to store program instructions, and the processor is specifically programmed to execute the program instructions to perform one or more operations described below. The control device can control the operation of units, modules, parts, devices, or the like, as described herein. Furthermore, it is understood that the procedures described below can be performed by a device comprising the control device in conjunction with one or more other components, as would be understood by a person skilled in the art.

[0044] Furthermore, the control device of the present disclosure / invention can be implemented as a non-volatile, computer-readable medium containing executable program instructions that are executed by a processor. Examples of computer-readable media include, but are not limited to, ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, flash drives, smart cards, and optical data storage devices. The computer-readable recording medium can also be distributed across a computer network, so that the program instructions are stored and executed in a distributed manner, e.g., by means of a telematics server or a controller area network (CAN).

[0045] The present disclosure / invention is described in more detail below with reference to the accompanying drawings, which illustrate embodiments of the present disclosure / invention. As a person skilled in the art would recognize, the described embodiments can be modified in various ways without deviating from the content or scope of the present disclosure / invention.

[0046] The drawings and descriptions are by their nature to be regarded as explanatory and not as restrictive, and the same reference symbols denote the same elements throughout the description.

[0047] Furthermore, the size and thickness of each configuration shown in the drawings may be arbitrarily shown for the sake of understanding and ease of description, but the present disclosure / invention is not limited thereto, and the thickness of layers, films, panels, areas and the like may be exaggerated (shown) for clarity.

[0048] Suffixes, “module” and / or “unit”, for a constituent element, which are used for the description below, are given or mixed solely for the sake of ease of writing the description, and the suffix itself has no distinguishing meaning or role.

[0049] Furthermore, when describing the embodiment disclosed in the present disclosure / invention, if it was determined / found that a detailed description relating to well-known functions or configurations could unnecessarily ambiguous the subject matter of the embodiments disclosed in the present disclosure / invention, the detailed description was omitted.

[0050] Furthermore, the accompanying drawings are provided to help to easily understand the embodiments disclosed in the present description, and the technical content disclosed in the present description is / will not be limited by the accompanying drawings, and it should be understood that the present disclosure / invention includes all modifications, equivalent content and substitutes which are contained in the idea and technical scope of the present disclosure / invention.

[0051] Terms, including ordinal numbers such as "first / first / first", "second / second / second" and the like, are only used to describe different components and are not to be interpreted as restricting those components.

[0052] As used herein, the singular forms “ein”, “eine”, “der”, “die” and “das” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0053] The terms are only used to distinguish one component from others.

[0054] In the following, a diagnostic device of a post-treatment system according to an embodiment of the present disclosure / invention is described in detail with reference to the accompanying drawings.

[0055] A vehicle which is used (e.g. equipped) with an aftertreatment device of an internal combustion engine (e.g. for an internal combustion engine) according to an embodiment of the present disclosure / invention is described in detail.

[0056] Fig. Figure 1 is a schematic view showing a configuration of the vehicle to which an aftertreatment system according to an embodiment of the present disclosure / invention is applied (e.g., in which such a system is used).

[0057] As in Fig. As shown in Figure 1, a vehicle to which an aftertreatment system according to an embodiment of the present disclosure / invention is applied can have an internal combustion engine 10, a first electric motor 20, a second electric motor 30, a clutch 40 and a control device 60.

[0058] The internal combustion engine 10 can have a plurality of cylinders 11 configured to generate the power required to propel the vehicle by burning fuel. In one embodiment of the present disclosure / invention, the internal combustion engine 10 can be a gasoline internal combustion engine 10.

[0059] The first electric motor 20 can start the combustion engine 10 (e.g., start it) and can, if required, selectively operate as a generator to produce electrical energy. The first electric motor 20 can be a type of integrated starter-generator.

[0060] The second electric motor 30 can generate the power required to drive the vehicle and, if necessary (e.g., if required), support the power of the combustion engine 10 (e.g., act as a supplement to it). Furthermore, the second electric motor 30 can selectively operate as a generator to produce electrical energy.

[0061] The clutch 40 can be provided between the combustion engine 10 and the second electric motor 30, and depending on an engagement (e.g. an engagement or an engagement state) of the clutch 40, the hybrid vehicle can drive in an electric vehicle (EV) mode or in a hybrid electric vehicle (HEV) mode.

[0062] The electric vehicle (EV) mode can be a mode in which the vehicle is driven (e.g., powered) only by the power of the second electric motor 30, and the hybrid electric vehicle (HEV) mode can be a mode in which the vehicle is driven (e.g., simultaneously) by the power of the combustion engine 10 and the power of the second electric motor 30.

[0063] The power output from the combustion engine 10 and the second electric motor 30 can be transmitted to drive wheels provided in the vehicle. A gearbox 50 can be provided between the clutch 40 and the drive wheel.

[0064] Shifting gears (e.g., shift gears, e.g., gear sets) are installed within the gearbox 50, and depending on the shifting gears (e.g., the gear sets), the power output can be changed by means of the internal combustion engine 10 and the second electric motor 30.

[0065] The control device 60 can control the components of the hybrid vehicle, which includes the internal combustion engine 10, the first electric motor 20, the second electric motor 30, the clutch 40 and an aftertreatment system 100 to be described below.

[0066] Depending on whether a predetermined diagnostic condition is met, the control device 60 can perform a diagnostic procedure which diagnoses whether component parts of the after-treatment system 100 (e.g. a first temperature sensor 111, a second temperature sensor 112, a third temperature sensor 113, a first bypass valve 121 and a second bypass valve 131) are abnormal.

[0067] The control device 60 can be provided as at least one processor which is executed by means of a predetermined program (e.g. which executes a predetermined program), and the predetermined program is configured to perform respective steps of a control method of the ignition device according to an embodiment of the present disclosure / invention.

[0068] Various hazardous substances contained in the exhaust gas emitted (e.g., ejected) by the combustion engine 10 can be cleaned by the aftertreatment system 100 and, after their noise has been dampened during passage through a silencer, can be released (e.g., ejected) into the air through an exhaust pipe.

[0069] Fig. Figure 2 is a block diagram showing a configuration of a post-treatment system according to an embodiment of the present disclosure / invention.

[0070] With reference to Fig. 2. According to an embodiment of the present disclosure / invention, the aftertreatment system 100 can comprise a warm-up catalytic converter (WCC) catalyst 140, a fuel cut NOx trap (FCNT) catalyst 150, and a lean NOx trap (LNT), e.g., a nitrogen oxide trap, catalyst 170, which are arranged sequentially (e.g., in series, e.g., in the specified order) along an exhaust pipe 110.

[0071] The WCC catalyst 140, the FCNT catalyst 150, and the LNT catalyst 170 can purify the harmful substances contained in the exhaust gas discharged (e.g., expelled) through the exhaust pipe 110 (e.g., remove the harmful substances contained in the exhaust gas to be discharged, either completely or partially). The WCC catalyst 140, the FCNT catalyst 150, and the LNT catalyst 170 can be arranged sequentially (e.g., in series, e.g., in the specified order) along the flow direction of the exhaust gas flowing through the exhaust pipe 110.

[0072] An exhaust heat recovery system (EHRS) 160 can be arranged on the exhaust line 110 between the FCNT catalyst 150 and the LNT catalyst 170. The exhaust heat recovery system 160 can be a type of heat exchanger and can recover the heat contained in the exhaust gas emitted from the combustion chamber of the internal combustion engine through the operating fluid (e.g., coolant).

[0073] A lambda probe 115 can be provided on the exhaust line 110, and a control device 60 can determine the air / fuel ratio of the internal combustion engine (AFR) by measuring the oxygen concentration of the exhaust gas through the lambda probe 115.

[0074] Several bypass lines 120 and 130, which bypass the exhaust gas heat recovery system 160 and the LNT catalyst 170, can be provided on the exhaust line 110, along which (e.g., through which) the exhaust gas expelled from the combustion engine 10 flows. The multiple bypass lines 120 and 130 can include a main bypass line 120 and an auxiliary bypass line (e.g., an additional bypass line) 130.

[0075] The main bypass line 120 can branch off from the exhaust line 110 between the FCNT catalyst 150 and the exhaust heat recovery system 160 and can rejoin the exhaust line 110 on a downstream side of the LNT catalyst 170 (e.g., again). The first bypass valve 121 can be installed at the point where the exhaust line 110 and the main bypass line 120 merge (e.g., where they converge). The first bypass valve 121 can be implemented as a 3-way valve. The first bypass valve 121 can be implemented as an electronic valve capable of adjusting its opening (e.g., its degree of opening).

[0076] Depending on the opening and closing of the first bypass valve 121, which is actuated by the control device 60, the exhaust gas passing through the WCC catalyst 140 and the FCNT catalyst 150 can pass through the LNT catalyst 170, which is located in the exhaust line 110, or can selectively flow through the main bypass line 120, which bypasses the LNT catalyst 170 (e.g., bypassing the LNT catalyst 170). In other words, depending on the opening and closing of the first bypass valve 121, the exhaust gas can pass through or bypass the LNT catalyst 170.

[0077] The auxiliary bypass line 130 can branch off from the exhaust line 110 between the FCNT catalyst 150 and the exhaust heat recovery system 160 (e.g., branch off) and can merge with the exhaust line 110 between the exhaust heat recovery system 160 and the LNT catalyst 170 (e.g., it can enter there). The second bypass valve 131 can be installed at a point where the exhaust line 110 and the auxiliary bypass line 130 merge (e.g., a second bypass valve 131 can be installed at a point where the auxiliary bypass line 130 branches off from the exhaust line 110). The second bypass valve can be implemented as an electronic valve that is able to adjust its opening (e.g., its degree of opening).

[0078] Depending on the opening and closing of the second bypass valve 131, which is actuated by the control device 60, the exhaust gas, which has passed through the WCC catalyst 140 and the FCNT catalyst 150, can pass through the exhaust gas heat recovery system 160, which is installed on (e.g., in) the exhaust line 110, or it can selectively flow through the auxiliary bypass line 130, which bypasses the exhaust gas heat recovery system 160 (e.g., bypassing the exhaust gas heat recovery system 160). In other words, depending on the opening and closing of the second bypass valve 131, the exhaust gas can pass through the exhaust gas heat recovery system 160 or bypass it.

[0079] In one embodiment of the present disclosure / invention, the control device 60 can control the operation (e.g., actuation) of the first bypass valve 121 and the second bypass valve 131 to change an exhaust gas output path. In other words, according to the operation (e.g., actuation) of the first bypass valve 121 and the second bypass valve 131, the exhaust gas output path can be selectively determined (e.g., set) as one of a first output path up to a third output path.

[0080] When the control device 60 opens the first bypass valve 121 and the second bypass valve 131, the exhaust gas, which has passed through the WCC catalyst 140 and the FCNT catalyst 150, can bypass the exhaust gas heat recovery system 160, pass through the LNT catalyst 170, and then be discharged into the air through the silencer. In one embodiment of the present disclosure / invention, such a path of the exhaust gas can be designated as the first discharge path (see Fig. 3) The first output path can be used in a warm-up mode to warm up (e.g., heating) the LNT catalyst 170.

[0081] If the control device 60 blocks (e.g., closes) the first bypass valve 121 and opens the second bypass valve 131, then the exhaust gas that has passed through the WCC catalyst 140 and the FCNT catalyst 150 can bypass the exhaust gas heat recovery system 160 and the LNT catalyst 170 and can then be discharged (e.g., released) into the air through the silencer. In one embodiment of the present disclosure / invention, such a path of the exhaust gas can be designated as a second discharge path (see Fig. 4) The second output path can be used when the internal combustion engine operates within a theoretical air / fuel ratio range.

[0082] When the control device 60 opens the first bypass valve 121 and blocks (e.g., closes) the second bypass valve 131, the exhaust gas that has passed through the WCC catalyst 140 and the FCNT catalyst 150 can pass through the exhaust gas heat recovery system 160 and the LNT catalyst 170 and can then be discharged (e.g., released) into the air through the silencer. In one embodiment of the present disclosure / invention, such a path of the exhaust gas is referred to as the third discharge path (see Fig. 5) The third output path can be used to recover the exhaust heat through the exhaust heat recovery system 160 if the LNT catalyst 170 is / becomes overheated by the high-temperature exhaust gas (e.g., would otherwise overheat).

[0083] An aftertreatment system according to an embodiment of the present disclosure / invention can include a first temperature sensor 111, which is configured to measure the temperature of the exhaust gas flowing through the exhaust line 110 on an upstream side of the first bypass valve 121 (e.g., to measure the temperature of the exhaust gas flowing through the exhaust line 121), and a second temperature sensor 112, which is configured to measure the temperature of the exhaust gas flowing through the exhaust line 110 on an upstream side of the exhaust gas heat recovery system 160 (e.g.,to measure the temperature of the exhaust gas on an upstream side of the exhaust gas heat recovery system 160, which flows through the exhaust gas line 110), the third temperature sensor 113, which is configured to measure the temperature of the exhaust gas flowing through an exhaust gas line 110 on the downstream side of the exhaust gas heat recovery system 160 (e.g. to measure the temperature of the exhaust gas on the downstream side of the exhaust gas heat recovery system 160, which flows through an exhaust gas line 110), and an ambient air temperature sensor 114, which is configured to measure the ambient air temperature.

[0084] The first temperature sensor 111 can be installed on (e.g., in) the exhaust pipe 110 on the upstream side of the first bypass valve 121 and can measure the temperature of the exhaust gas flowing through the exhaust pipe 110 on the upstream side of the first bypass valve 121 (e.g., it can measure the temperature of the exhaust gas on the upstream side of the first bypass valve 121 flowing through the exhaust pipe 110). The exhaust gas temperature measured by the first temperature sensor 111 can be transmitted to the control device 60. Hereinafter, if necessary, the exhaust gas temperature measured by the temperature sensor 111 can be referred to as a first measured temperature.

[0085] The second temperature sensor 112 can be installed on (e.g., in) the exhaust pipe 110 on the upstream side of the exhaust gas heat recovery system 160 and can measure the temperature of the exhaust gas flowing through the exhaust pipe 110 on the upstream side of the exhaust gas heat recovery system 160 (e.g., it can measure the temperature of the exhaust gas on the upstream side of the exhaust gas heat recovery system 160 flowing through the exhaust pipe 110). The exhaust gas temperature measured by the second temperature sensor 112 can be transmitted to the control device 60. Hereinafter, if necessary, the exhaust gas temperature measured by the second temperature sensor 112 can be referred to as a second measured temperature.

[0086] The third temperature sensor 113 can be installed on (e.g., in) the exhaust pipe 110 on the downstream side of the exhaust gas heat recovery system 160. When the temperature of the exhaust gas flowing through the exhaust pipe 110 on the downstream side of the exhaust gas heat recovery system 160 is measured (e.g., when the temperature of the exhaust gas flowing through the exhaust pipe 110 is measured), the exhaust gas temperature measured by the third temperature sensor 113 can be transmitted to the control device 60. Hereinafter, if necessary, the exhaust gas temperature measured by the third temperature sensor 113 can be referred to as a third measured temperature.

[0087] The ambient air temperature sensor 114 can measure the ambient air temperature, and the ambient air temperature measured by the ambient air temperature sensor 114 can be transmitted to the control device 60.

[0088] Depending on whether a predetermined diagnostic condition (a first diagnostic condition up to a fifth diagnostic condition) is met, the control device 60 can determine whether the first temperature sensor 111, the second temperature sensor 112, the third temperature sensor 113, the first bypass valve 121 and the exhaust gas heat recovery system 160 are abnormal, and can indicate by means of a display unit 70 whether the first temperature sensor 111, the second temperature sensor 112, the third temperature sensor 113, the first bypass valve 121 and the exhaust gas heat recovery system 160 are normal and / or abnormal (e.g. normal or abnormal in an associated manner).

[0089] The control device 60 can be implemented to have one or more processors which operate according to a preset program, and a memory of the control device can store program instructions which are programmed to carry out each step of a method for diagnosing a post-treatment system which is equipped with an electric motor, according to the disclosure / invention, by one or more processors.

[0090] A method for diagnosing a post-treatment system according to an embodiment of the present disclosure / invention is described in detail below with reference to the drawings.

[0091] Fig. Figure 6 is a flowchart showing a method for diagnosing (e.g., examining) a post-treatment system according to an embodiment of the present disclosure / invention.

[0092] With reference to Fig. 6, if the preliminary diagnostic condition is met, (then) the control device 60 can provisionally determine the validity (e.g. the validity) of the first temperature sensor 111 to the third temperature sensor 113, in step S100.

[0093] If the first diagnostic condition is met, (then) the control device 60 can determine whether the first temperature sensor 111 is abnormal, in step S200.

[0094] If a second diagnostic condition is met, (then) the control device 60 can determine whether the second temperature sensor 112 is abnormal, in step S300.

[0095] If a third diagnostic condition is met, (then) the control device 60 can determine whether the third temperature sensor 113 is abnormal, in step S400.

[0096] If a fourth diagnostic condition is met, (then) the control device 60 can determine whether the first bypass valve 121 and the second temperature sensor 112 are abnormal, in step S500.

[0097] If the fifth diagnostic condition is met, (then) the control device 60 can determine whether the second bypass valve 131 and the third temperature sensor 113 are abnormal, in step S600.

[0098] Each diagnostic procedure is described in detail below.

[0099] With reference to Fig. 7. The control device 60 can determine whether a preliminary diagnostic condition is met in step S110. The preliminary diagnostic condition serves to (e.g., is a condition for) provisionally validate the validity (i.e., the plausibility) with respect to the exhaust gas temperature measured by the first temperature sensor 111, the second temperature sensor 112, and the third temperature sensor 113, and can be met if the stop duration (e.g., the non-operation duration) of the internal combustion engine is greater than or equal to a predetermined time (e.g., 300 minutes).

[0100] If the preliminary diagnostic condition is met, (then) the control device 60 can compare the first to third measured temperature with the ambient air temperature measured by the ambient air temperature sensor 114, in step S120.

[0101] If the difference between each of the first to third measured temperatures and the ambient air temperature measured by the ambient air temperature sensor 114 is less than a first reference temperature (e.g. 10 degrees Celsius), the control device 60 can provisionally determine that the temperatures measured by the respective temperature sensors (first to third temperature sensors 111, 112 and 113) are valid (e.g. plausible), in step S130 (see Fig. 8A), and can perform subsequent diagnostic procedures.

[0102] If the difference between the first to third measured temperatures and the ambient air temperature measured by the ambient air temperature sensor 114 is greater than or equal to the first reference temperature, the control device 60 can determine that the temperature measured by the corresponding temperature sensor is not valid (e.g., not valid) (see Fig. 8B), and can end the diagnostic process.

[0103] With reference to Fig. 9. The control device 60 can determine whether the first diagnostic condition is met in step S210. The first diagnostic condition serves (e.g., is a condition for) diagnosing whether the first temperature sensor 111 is abnormal and can be met if the temperature measured by means of the first temperature sensor 111 to the third temperature sensor 113, while the preliminary diagnostic condition is met, is / is / has been provisionally verified to be valid, and the internal combustion engine is running.

[0104] If the first diagnostic condition is met, (then) the control device 60 can determine, based on the first measured temperature and a modeled temperature, whether the first temperature sensor 111 is abnormal.

[0105] For this purpose, the control device 60 can compare the first measured temperature and the modeling temperature in step S220. The modeling temperature can be the temperature of the exhaust gas on the upstream side of the first bypass valve 121, which is determined based on an internal combustion engine speed, an internal combustion engine load, and an internal combustion engine operating time, and can be determined experimentally. The modeling temperature can be pre-stored in the control device 60.

[0106] If the difference between the first measured temperature and the modeling temperature is less than a second reference temperature (e.g. 50 degrees Celsius), (then) the control device 60 can determine that the first temperature sensor 111 is normal, in step S230.

[0107] If the difference between the first measured temperature and the modeled temperature is greater than or equal to the second reference temperature (e.g., 50 degrees Celsius), the control device 60 can determine that the first temperature sensor 111 is abnormal, in step S240. The control device 60 can notify (e.g., inform) a driver via the display unit 70 that an abnormality (e.g., an anomaly) of the first temperature sensor 111 has occurred.

[0108] With reference to Fig. In step S310, the control device 60 can determine whether the second diagnostic condition is met. The second diagnostic condition serves (e.g., is a condition for this) to diagnose whether the second temperature sensor 112 is abnormal and can be met if it is determined that the first temperature sensor 111 is normal, while the first diagnostic condition is met, the internal combustion engine is running, and the exhaust gas temperature on the upstream side of the first bypass valve 121 is higher than or equal to a first predetermined temperature (e.g., 200 degrees Celsius). The reason for determining whether the temperature on the upstream side of the first bypass valve 121 is higher than or equal to the first predetermined temperature is to ascertain whether the internal combustion engine has warmed up sufficiently.

[0109] If the second diagnostic condition is met, (then) the control device 60 can determine, based on the first measured temperature and the second measured temperature, whether the second temperature sensor 112 is abnormal.

[0110] For such a purpose, the control device 60 can compare the first measured temperature and the second measured temperature, in step S320.

[0111] If the first measured temperature is higher than or equal to the second measured temperature, (then) the control device 60 can determine that the second temperature sensor 112 is normal, in step S330.

[0112] If the first measured temperature is lower than the second measured temperature, the control device 60 can determine that the second temperature sensor 112 is abnormal, in step S340. The control device 60 can notify the driver via the display unit 70 that an abnormality (e.g., an anomaly) has occurred in the second temperature sensor 112.

[0113] Since the first temperature sensor 111 is located upstream of the second temperature sensor 112 based on the exhaust gas flow direction, the second measured temperature must be lower than the first measured temperature. However, if the first measured temperature is higher than the second measured temperature, the control device 60 can determine that an abnormality (e.g., an anomaly) has occurred in the second temperature sensor 112.

[0114] With reference to Fig. In step S410, the control device 60 can determine whether the third diagnostic condition is met. The third diagnostic condition serves to determine (e.g., is a condition for this) whether the third temperature sensor 113 is abnormal and can be met if it is determined that the second temperature sensor 112 is normal, while the second diagnostic condition is met, the combustion engine is running, the exhaust gas temperature on the upstream side of the exhaust gas heat recovery system 160 is higher than or equal to a second predetermined temperature (e.g., 200 degrees Celsius), and the first bypass valve 121 is open.

[0115] The reason for determining whether the temperature of the exhaust gas flowing through the exhaust pipe on the upstream side of the exhaust gas heat recovery system 160 is higher than or equal to the predetermined temperature (e.g. 200 degrees Celsius) is to determine whether the combustion engine has warmed up sufficiently.

[0116] If the third diagnostic condition is met, (then) the control device 60 can determine, based on the second measured temperature and the third measured temperature, whether the third temperature sensor 113 is abnormal.

[0117] For such a purpose, the control device 60 can compare the second measured temperature and the third measured temperature (e.g. with each other) in step S420.

[0118] If the second measured temperature is higher than or equal to the third measured temperature, (then) the control device 60 can determine that the third temperature sensor 113 is normal, in step S430.

[0119] If the second measured temperature is lower than the third measured temperature, the control device 60 can determine that the third temperature sensor 113 is abnormal, in step S440. The control device 60 can notify the driver via the display unit 70 that an abnormality (e.g., an anomaly) has occurred in the third temperature sensor 113.

[0120] Since the second temperature sensor 112 is located upstream of the third temperature sensor 113 based on the exhaust gas flow direction, the third measured temperature must be lower than the second measured temperature. However, if the second measured temperature is higher than the third measured temperature, the control device 60 can determine that an abnormality (e.g., an anomaly) has occurred in the third temperature sensor 113.

[0121] With reference to Fig. In step S510, the control device 60 can determine whether the fourth diagnostic condition is met. The fourth diagnostic condition serves to diagnose whether the first bypass valve 121 is abnormal (e.g., whether the first bypass valve 121 is stuck (e.g., jammed / blocked) or closed) and whether the second temperature sensor 112 is abnormal. It can be met if it is determined that the third temperature sensor 113 is normal, while the third diagnostic condition is met, the combustion engine is running, and the exhaust gas temperature on the upstream side of the exhaust gas heat recovery system 160 is higher than or equal to a third predetermined temperature (e.g., 300 degrees Celsius).

[0122] If the fourth diagnostic condition is met, (then) the control device 60 can apply a control signal (e.g., apply) to open the first bypass valve 121, and can diagnose, based on the first measured temperature, the second measured temperature, and the third measured temperature, whether the first bypass valve 121 and the second temperature sensor 112 are abnormal.

[0123] For such a purpose, the control device 60 can compare the first measured temperature and the second measured temperature (e.g. with each other) in step S520, and can compare the second measured temperature and the third measured temperature (e.g. with each other) in step S530.

[0124] If the difference between the first measured temperature and the second measured temperature is lower than a third reference temperature (e.g., 180 degrees Celsius), the control device 60 can determine that the first bypass valve 121 and the second temperature sensor 112 are normal, in step S540 (see Fig. 13A).

[0125] If the difference between the first measured temperature and the second measured temperature is lower than the third reference temperature (e.g. 180 degrees Celsius), (then) the control device 60 can apply a control signal (e.g. apply) to open the first bypass valve 121.

[0126] If the difference between the first measured temperature and the second measured temperature is greater than or equal to the third reference temperature, and the difference between the third measured temperature and the second measured temperature is less than a fourth reference temperature (or if the difference between the temperature of the exhaust gas on the upstream side of the exhaust gas heat recovery system 160 and the temperature of the exhaust gas on the downstream side of the exhaust gas heat recovery system 160 is not large), (then) the control device 60 can determine that the first bypass valve 121 is stuck (e.g., jammed / blocked) or closed, in step S531 (see Fig. 13B). The control device 60 can notify the driver via the display unit 70 that an abnormality (e.g. an anomaly) has occurred in the first bypass valve (e.g. of the first bypass valve) 121.

[0127] When the first bypass valve 121 is actuated to be open (e.g., to be / become open), the difference between the first and second measured temperatures should not be large. Therefore, if the difference between the first and second measured temperatures is greater than or equal to the third reference temperature, the control device 60 can provisionally determine that an abnormality (e.g., an anomaly) has occurred in either the first bypass valve 121 or the second temperature sensor 112.

[0128] When a control signal is applied (e.g., applied) by means of the control device 60 to open the first bypass valve 121, the first bypass valve 121 is opened, so that the exhaust gas from the upstream side of the first bypass valve 121 must be introduced (e.g., directed) into the upstream side of the exhaust gas heat recovery system 160. However, if the third measured temperature and the second measured temperature are lower than the fourth reference temperature, this may mean that the difference between the upstream side and the downstream side of the exhaust gas heat recovery system 160 is small. In this case, the control device 60 can determine that the first bypass valve 121 is stuck (e.g. jammed / blocked) or closed and the exhaust gas is bypassing the exhaust gas heat recovery system 160.

[0129] If the difference between the first measured temperature and the second measured temperature is greater than or equal to the third reference temperature, and the difference between the third measured temperature and the second measured temperature is greater than or equal to the fourth reference temperature (or if the temperature of the exhaust gas on the downstream side of the exhaust gas heat recovery system 160 is higher than the temperature of the exhaust gas on the upstream side of the exhaust gas heat recovery system 160), (then) the control device 60 can determine that an abnormality (e.g. an anomaly) has occurred in the second temperature sensor 112, in step S533.

[0130] When a control signal is applied (e.g., applied) by means of the control device 60 to open the first bypass valve 121, and the exhaust gas passes through the exhaust gas heat recovery system 160, the temperature of the exhaust gas on the downstream side of the exhaust gas heat recovery system 160 must be lower than the temperature of the exhaust gas on the upstream side of the exhaust gas heat recovery system 160. However, if the difference between the temperature of the exhaust gas on the upstream side of the exhaust gas heat recovery system 160 and the temperature of the exhaust gas on the downstream side of the exhaust gas heat recovery system 160 is greater than or equal to the fourth reference temperature, this may mean that the second measured temperature is abnormally low. In this case, the control device 60 can determine that an abnormality (e.g.an anomaly) occurred in the second temperature sensor 112.

[0131] With reference to Fig. In step S610, the control device 60 can determine whether the fifth diagnostic condition is met. The fifth diagnostic condition serves to diagnose whether the second bypass valve 131 and the third temperature sensor 113 are abnormal, and can be met if it is determined that the first bypass valve 121 and the second temperature sensor 112 are normal, while the fourth diagnostic condition is met, the combustion engine is running, and the exhaust gas temperature on the upstream side of the exhaust gas heat recovery system 160 is higher than or equal to the third predetermined temperature (e.g., 300 degrees Celsius).

[0132] If the fifth diagnostic condition is met, the control device 60 can apply a control signal (e.g., apply a signal) so that the second bypass valve 131 is closed to a preset value (e.g., a closing ratio (e.g., a closing degree) of 85%) or apply a control signal (e.g., apply a signal) so that the second bypass valve 131 is open to a preset amount (e.g., an opening ratio (e.g., an opening degree) of 15%), and can diagnose, based on a temperature range of the third measured temperature, whether the second bypass valve 131 and the third temperature sensor 113 are abnormal.

[0133] For such a purpose, the control device 60 can compare the third measured temperature with a fifth reference temperature (e.g. 180 degrees Celsius) and a sixth reference temperature (e.g. 70 degrees Celsius) in step S620.

[0134] If the third measured temperature is higher than or equal to the fifth reference temperature, (then) the control device 60 can determine that the second bypass valve 131 and the third temperature sensor 113 are normal, in step S630 (see Fig. 15A).

[0135] If the third measured temperature is lower than the fifth reference temperature and higher than or equal to the sixth reference temperature, (then) the control device 60 can determine that the second bypass valve 131 is abnormal, in step S640 (see Fig. 15B). The control device 60 can notify a driver via the display unit 70 that an abnormality (e.g. an anomaly) of the second bypass valve 131 has occurred.

[0136] If the second measured temperature is higher than or equal to the third predetermined temperature (300 degrees Celsius), or if the third measured temperature is lower than or equal to the fifth reference temperature (180 degrees Celsius), it may be determined that the temperature of the exhaust gas heat exchanged by means of the exhaust gas heat recovery system 160 is excessively low, and in this case the control device 60 may determine that the opening (e.g. the degree of opening) of the second bypass valve 131 is abnormal.

[0137] If the third measured temperature is lower than the sixth reference temperature, the control device 60 can determine that the third temperature sensor 113 is abnormal, as shown in step S650. The control device 60 can notify the driver (e.g., the drive unit) via the display unit 70 that an abnormality (e.g., an anomaly) has occurred in the third temperature sensor 113. If the second measured temperature is higher than or equal to the third predetermined temperature (300 degrees Celsius), or if the third measured temperature is lower than or equal to the sixth reference temperature (70 degrees Celsius), it can be determined that the third measured temperature is excessively low, and in this case, the control device 60 can determine that an abnormality (e.g., an anomaly) has occurred in the third temperature sensor 113.

[0138] According to a diagnostic device of a post-treatment system according to an embodiment of the present disclosure / invention, it is possible to diagnose whether the first temperature sensor 111 to the third temperature sensor 113, the first bypass valve 121 and the second bypass valve 131 are abnormal.

[0139] Fig. Figure 16 is a representation to explain a computing device according to an embodiment of the present disclosure / invention.

[0140] With reference to Fig. 16. A method for diagnosing a post-treatment system according to an embodiment of the present disclosure / invention may be implemented using a computing device 900.

[0141] The computing device 900 can comprise at least one processor 910, one memory 930, one user interface input device 940, one user interface output device 950, and one storage device 960, which communicate with each other via a bus 920. The computing device 900 can also comprise a network interface 970, which is electrically connected to a network 990. The network interface 970 can transmit or receive signals with other entities via the network 990 (e.g., exchange data).

[0142] The 910 processor can be implemented in various types, for example as a microcontroller unit (MCU), an application processor (AP), a central processing unit (CPU), a graphics processing unit (GPU), a neural processing unit (NPU), and the like, and can be any type of semiconductor device capable of executing instructions stored in memory 930 or memory device 960. The 910 processor can be configured to perform the above-mentioned tasks with reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig.to implement the 16 described functions and procedures.

[0143] The memory 930 and the storage device 960 can comprise various types of volatile or non-volatile storage media. For example, the memory can comprise a read-only memory (ROM) 931 and a random-access memory (RAM) 932. In one embodiment of the present disclosure / invention, the memory 930 can be arranged inside or outside the processor 910, and the memory 930 can be connected to the processor 910 by various known means.

[0144] In some embodiments of the present disclosure / invention, at least some components or functions of the diagnostic device of a post-treatment system according to embodiments may be implemented as a program or software which is executed by means of the computing device 900, or the program or software may be stored in a computer-readable medium.

[0145] In some embodiments, at least some components or functions of a diagnostic device of a post-treatment system according to embodiments may be implemented using hardware or a circuit of the computing device 900, or may be implemented as separate hardware or (as a separate) circuit, which may be electrically connected to the computing device 900.

[0146] Although one embodiment of the present disclosure / invention has been described, the present disclosure / invention is not limited to it, and it is possible to make various modifications within the scope of the claims, the detailed description of the disclosure / invention and the accompanying drawings, and the modifications are of course included in the scope of the present disclosure / invention. REFERENCE MARK LIST 10 Internal combustion engine 11 cylinders 20 first electric motor 30 second electric motor 40 Clutch 50 gearboxes 60 Control device 70 Display unit 100 aftercare system 110 Exhaust pipe 111 first temperature sensor 112 second temperature sensor 113 third temperature sensor 114 Ambient air temperature sensor 120 Main Bypass Line 121 first bypass valve 130 Auxiliary bypass line 131 second bypass valve 140 WCC catalyst 150 FCNT catalyst 160 Exhaust gas heat recovery system 170 LNT catalyst

Claims

Device for diagnosing an aftertreatment system (100), the device comprising: a first catalyst (150), an exhaust gas heat recovery system (160) and a second catalyst (170), which are arranged sequentially on an exhaust gas line (110); a main bypass line (120) which branches off from the exhaust gas line (110) between the first catalyst (150) and the exhaust gas heat recovery system (160) and which joins the exhaust gas line (110) on a downstream side of the second catalyst (170); an auxiliary bypass line (130) which branches off from the exhaust gas line (110) between the first catalyst (150) and the exhaust gas heat recovery system (160) and which joins the exhaust gas line (110) between the exhaust gas heat recovery system (160) and the second catalyst (170), a first bypass valve (121) which is installed at one location,a second bypass valve (131) installed at the point where the exhaust pipe (110) and the main bypass pipe (120) merge, a second bypass valve (131) installed at the point where the exhaust pipe (110) and the auxiliary bypass pipe (130) merge, and a control device (60) configured to determine, based on whether a predetermined diagnostic condition is met, whether at least one of a first temperature sensor (111), a second temperature sensor (112), a third temperature sensor (113), the first bypass valve (121), or the second bypass valve (131) is abnormal, wherein the first temperature sensor (111) is configured to measure an exhaust gas temperature on an upstream side of the first bypass valve (121), and the second temperature sensor (112) is configured to measure an exhaust gas temperature on an upstream side of the to measure exhaust gas heat recovery system (160),and the third temperature sensor (113) is configured to measure the temperature of the exhaust gas on the downstream side of the exhaust gas heat recovery system (160). Device according to claim 1, wherein the predetermined diagnostic condition comprises: a preliminary diagnostic condition for verifying the validity of the first temperature sensor (111), the second temperature sensor (112), and the third temperature sensor (113); a first diagnostic condition for diagnosing whether the first temperature sensor (111) is abnormal; a second diagnostic condition for diagnosing whether the second temperature sensor (112) is abnormal; a third diagnostic condition for diagnosing whether the third temperature sensor (113) is abnormal; a fourth diagnostic condition for diagnosing whether the first bypass valve (121) is abnormal; and a fifth diagnostic condition for diagnosing whether the exhaust gas heat recovery system (160) is abnormal. Device according to claim 2, wherein: the preliminary diagnostic condition is met when the stop duration of an internal combustion engine is greater than or equal to a predetermined time; the first diagnostic condition is met when the temperature measured by the first temperature sensor (111), the temperature measured by the second temperature sensor (112), and the temperature measured by the third temperature sensor (113) are provisionally verified to be valid while the preliminary diagnostic condition is met, and the internal combustion engine is running; the second diagnostic condition is met when it is determined that the first temperature sensor (111) is normal, the internal combustion engine is running, and the exhaust gas temperature on the upstream side of the first bypass valve (121) is higher than or equal to a first predetermined temperature while the first diagnostic condition is met; the third diagnostic condition is met when it is determined thatthat the second temperature sensor (112) is normal, the internal combustion engine is running, and the exhaust gas temperature on the upstream side of the exhaust gas heat recovery system (160) is higher than or equal to a second predetermined temperature, and the first bypass valve (121) is open while the second diagnostic condition is met; the fourth diagnostic condition is met when it is determined that the third temperature sensor (113) is normal, the internal combustion engine is running, and the exhaust gas temperature on the upstream side of the exhaust gas heat recovery system (160) is higher than or equal to a third predetermined temperature while the third diagnostic condition is met; and the fifth diagnostic condition is met when it is determined that the first bypass valve (121) and the second temperature sensor (112) are normal.the internal combustion engine is running and the temperature of the exhaust gas on the upstream side of the exhaust gas heat recovery system (160) is higher than or equal to the third predetermined temperature, while the fourth diagnostic condition is met. Device according to any one of claims 2 to 3, wherein, when the first diagnostic condition is met, the control device (60) is configured to determine whether the first temperature sensor (111) is abnormal by comparing a difference between the exhaust gas temperature measured by the first temperature sensor (111) and a modeled temperature. Device according to claim 4, wherein, if the difference between the temperature of the exhaust gas measured by means of the first temperature sensor (111) and the modeling temperature is less than a second reference temperature, the control device (60) determines that the first temperature sensor (111) is normal. Device according to claim 4 or 5, wherein, if the difference between the temperature of the exhaust gas measured by means of the first temperature sensor (111) and the modeling temperature is greater than or equal to a second reference temperature, the control device (60) determines that the first temperature sensor (111) is abnormal. Device according to any one of claims 2 to 6, wherein, when the second diagnostic condition is met, the control device (60) determines whether the second temperature sensor (112) is abnormal by comparing the temperature of the exhaust gas measured by the first temperature sensor (111) with the temperature of the exhaust gas measured by the second temperature sensor (112). Device according to claim 7, wherein, if the temperature of the exhaust gas measured by means of the first temperature sensor (111) is higher than or equal to the temperature of the exhaust gas measured by means of the second temperature sensor, the control device (60) determines that the second temperature sensor (112) is normal. Device according to claim 7 or 8, wherein, if the temperature of the exhaust gas measured by means of the first temperature sensor (111) is lower than the temperature of the exhaust gas measured by means of the second temperature sensor (112), the control device (60) determines that the second temperature sensor (112) is abnormal. Device according to any one of claims 2 to 9, wherein, when the third diagnostic condition is met, the control device (60) is configured to compare the exhaust gas temperature measured by the second temperature sensor (112) with the exhaust gas temperature measured by the third temperature sensor (113) to determine whether the third temperature sensor (113) is abnormal. Device according to claim 10, wherein, if the temperature of the exhaust gas measured by means of the second temperature sensor (112) is higher than or equal to the temperature of the exhaust gas measured by means of the third temperature sensor (113), the control device (60) determines that the third temperature sensor (113) is normal. Device according to claim 10 or 11, wherein, if the temperature of the exhaust gas measured by means of the second temperature sensor (112) is lower than the temperature of the exhaust gas measured by means of the third temperature sensor (113), the control device (60) determines that the third temperature sensor (113) is abnormal. Device according to any one of claims 2 to 12, wherein, when the fourth diagnostic condition is met, the control device (60) is configured to: apply a control signal to close the first bypass valve (121), compare the exhaust gas temperature measured by the first temperature sensor (111) with the exhaust gas temperature measured by the second temperature sensor (112), compare the exhaust gas temperature measured by the second temperature sensor (112) with the exhaust gas temperature measured by the third temperature sensor (113), and determine whether the first bypass valve (121) and the second temperature sensor (112) are abnormal. Device according to any one of claims 1 to 13, wherein if a difference between an exhaust gas temperature measured by the first temperature sensor (111) and an exhaust gas temperature measured by the second temperature sensor (112) is lower than a third reference temperature and a difference between an exhaust gas temperature measured by the second temperature sensor (112) and an exhaust gas temperature measured by the third temperature sensor (113) is greater than or equal to a fourth reference temperature, the control device (60) determines that the first bypass valve (121) is normal. Device according to any one of claims 1 to 14, wherein if a difference between the exhaust gas temperature measured by the first temperature sensor (111) and the exhaust gas temperature measured by the second temperature sensor (112) is greater than or equal to a third reference temperature, and a difference between the exhaust gas temperature measured by the second temperature sensor (112) and the exhaust gas temperature measured by the third temperature sensor (113) is less than a fourth reference temperature, the control device (60) determines that the first bypass valve (121) is abnormal. Device according to any one of claims 1 to 15, wherein if a difference between a temperature of the exhaust gas measured by the first temperature sensor (111) and a temperature of the exhaust gas measured by the second temperature sensor (112) is greater than or equal to a third reference temperature, and a difference between the temperature of the exhaust gas measured by the second temperature sensor (112) and a temperature of the exhaust gas measured by the third temperature sensor (113) is greater than or equal to a fourth reference temperature, the control device (60) determines that the second temperature sensor (112) is abnormal. Device according to any one of claims 2 to 16, wherein, when the fifth diagnostic condition is met, the control device (60) determines, on the basis of the exhaust gas temperature measured by means of the third temperature sensor (113), whether the second bypass valve (131) and the third temperature sensor (113) are abnormal. Device according to any one of claims 1 to 17, wherein if the temperature of the exhaust gas measured by means of the third temperature sensor (113) is lower than a fifth reference temperature and higher than or equal to a sixth reference temperature, the control device (60) is configured to determine that the exhaust gas heat recovery system (160) is normal. Device according to any one of claims 1 to 18, wherein if the temperature of the exhaust gas measured by means of the third temperature sensor (113) is lower than a fifth reference temperature and higher than or equal to a sixth reference temperature, the control device (60) determines that the second bypass valve (131) is abnormal. Device according to any one of claims 1 to 19, wherein if the temperature of the exhaust gas measured by means of the third temperature sensor (113) is lower than a sixth reference temperature, the control device (60) determines that the third temperature sensor (113) is abnormal.

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