A method and device for measuring temperature upstream of an SCR, an electronic device and a storage medium

Abstract

The embodiment of the application provides a kind of SCR upstream temperature measurement method, the SCR upstream includes temperature measurement circuit for controlling heating mode, the temperature measurement circuit includes the power supply, line and temperature sensor connected, the measurement method includes: obtaining heating mode jump abnormal condition;If heating mode jump abnormal, temperature sensor is short-circuit connection, obtains line resistance;According to line resistance, temperature sensor resistance is obtained;According to temperature sensor resistance, accurate temperature measurement value is determined;The technical problem that the existing SCR upstream temperature measurement method, the resistance value deviation of line is too large and causes engine heating mode jump abnormality is solved, accurate measurement SCR upstream temperature is realized, and the technical effect that engine heating mode jump abnormality is avoided.

Description

Technical Field

[0001] This invention relates to the automotive field, and more specifically to a method, apparatus, electronic device, and storage medium for measuring upstream temperature of an SCR (Superconducting Refrigerant CR). Background Technology

[0002] Selective catalytic reduction (SCR) is a treatment process for NOx emissions from diesel vehicles. In this process, a reducing agent such as ammonia or urea is injected under the action of a catalyst to reduce NOx in the exhaust gas into N2 and H2O.

[0003] In existing technologies, when the SCR catalyst temperature is below a certain limit, the engine will actively take a series of heating measures to help the SCR temperature rise rapidly in order to meet the requirements of SCR conversion efficiency; the core of the above solution lies in how to measure the upstream temperature value of the SCR.

[0004] Regarding the upstream temperature value of SCR, the existing technology uses a temperature sensor connected to the test bench wiring harness to measure the upstream temperature value of SCR. However, this solution results in an excessively long wiring harness in the vehicle or on the test bench, typically around 10 meters. Furthermore, the materials of the wiring harness and connectors vary, leading to significant deviations in the resistance of other components in the circuit. The presence of these resistances can cause errors in the calculation of the upstream temperature of SCR. These errors can cause abnormal switching of the engine heating mode, which in turn can lead to excessive emissions.

[0005] Therefore, there is an urgent need to propose a method, device, electronic equipment, and storage medium for measuring the upstream temperature of an SCR, in order to at least solve the technical problem of abnormal engine heating mode switching caused by excessive resistance deviation in the circuit of existing SCR upstream temperature measurement methods. Summary of the Invention

[0006] This application provides a method, apparatus, electronic device, and storage medium for measuring upstream temperature of an SCR, to at least solve the technical problem of abnormal engine heating mode switching caused by excessive resistance deviation in the circuit of existing SCR upstream temperature measurement methods.

[0007] According to one aspect of this application, a method for measuring upstream temperature of an SCR is provided. The upstream of the SCR includes a temperature measuring circuit for controlling a heating mode. The temperature measuring circuit includes a power supply, a line, and a temperature sensor connected in series. The measurement method includes: acquiring a heating mode switching abnormality; if the heating mode switching is abnormal, short-circuiting the temperature sensor to acquire the line resistance; acquiring the temperature sensor resistance based on the line resistance; and determining an accurate temperature measurement value based on the temperature sensor resistance.

[0008] Optionally, if the heating mode switching is abnormal, the temperature sensor is short-circuited. Before obtaining the line resistance, the following steps are also included: if the heating mode switching is abnormal, the line resistance is corrected; the abnormal heating mode switching condition is obtained; if the heating mode switching is normal, the voltage of the temperature measurement circuit is obtained; and the temperature measurement value is determined based on the temperature measurement circuit voltage.

[0009] Optionally, the temperature measurement circuit further includes an adjusting resistor connected in parallel with the line; the step of correcting the line resistance if the heating mode jumps abnormally includes controlling the opening / closing of the adjusting resistor.

[0010] Optionally, the number of the regulating resistors is multiple, and the temperature measuring circuit further includes control switches corresponding to the multiple regulating resistors.

[0011] Optionally, the circuit breaking / connection of the control regulating resistor includes: connecting one regulating resistor; obtaining an abnormal heating mode jump situation; if the heating mode jump is abnormal, connecting another regulating resistor again until the heating mode jumps normally or all of the regulating resistors are in a connected state.

[0012] Optionally, the temperature measurement circuit further includes a shorter circuit to short-circuit the temperature sensor.

[0013] Optionally, the temperature measurement circuit further includes a current testing unit to detect the circuit current; obtaining the temperature sensor resistance based on the line resistance includes: determining the total circuit resistance based on the circuit current and the temperature measurement circuit voltage; and determining the temperature sensor resistance based on the total circuit resistance.

[0014] According to another aspect of this application, an upstream temperature measuring device for an SCR is provided, comprising: a heating mode switching abnormality acquisition module for acquiring heating mode switching abnormality; a line resistance acquisition module for short-circuiting a temperature sensor and acquiring the line resistance if the heating mode switching is abnormal; a temperature sensor resistance acquisition module for acquiring the temperature sensor resistance based on the line resistance; and an accurate temperature measurement value determination module for determining the accurate temperature measurement value based on the temperature sensor resistance.

[0015] According to another aspect of this application, an electronic device is provided, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus, the memory is used to store a computer program, and the processor is used to execute the steps of the SCR upstream temperature measurement method as described in any of the preceding claims by running the computer program stored in the memory.

[0016] According to another aspect of this application, a computer-readable storage medium is provided, wherein a computer program is stored therein, wherein the computer program is configured to execute the steps of the SCR upstream temperature measurement method as described in any of the preceding claims when running.

[0017] This application provides a method for measuring the upstream temperature of an SCR (Self-Containing CR). The upstream of the SCR includes a temperature measurement circuit for controlling the heating mode. The temperature measurement circuit includes a power supply, a line, and a temperature sensor connected to it. The measurement method includes: acquiring information about abnormal heating mode switching; if the heating mode switching is abnormal, short-circuiting the temperature sensor to obtain the line resistance; obtaining the temperature sensor resistance based on the line resistance; and determining an accurate temperature measurement value based on the temperature sensor resistance. This method solves the technical problem of abnormal engine heating mode switching caused by excessive resistance deviation in the line in existing SCR upstream temperature measurement methods, and achieves the technical effect of accurately measuring the upstream temperature of the SCR and avoiding abnormal engine heating mode switching. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the hardware environment for an optional SCR upstream temperature measurement method according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic flowchart of an optional SCR upstream temperature measurement method according to an embodiment of the present invention;

[0022] Figure 3 This is a circuit diagram illustrating the measurement of upstream temperature of the SCR by the existing ECU and temperature sensor.

[0023] Figure 4 This is a schematic diagram of an optional SCR upstream temperature measuring device according to an embodiment of the present invention;

[0024] Figure 5 A structural block diagram of an optional electronic device according to an embodiment of this application. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] According to one aspect of the embodiments of this application, a method for measuring the upstream temperature of an SCR is provided. Optionally, in this embodiment, the above-described method for measuring the upstream temperature of an SCR can be applied to, for example... Figure 1 The hardware environment shown consists of terminal 102 and server 104. For example... Figure 1 As shown, server 104 is connected to terminal 102 via a network and can provide services to the terminal or clients installed on the terminal. It can set up a database on the server or independently of the server to provide data storage services for server 104, and can also be used to handle cloud services. The aforementioned network includes, but is not limited to, wide area networks (WANs), metropolitan area networks (MANs), or local area networks (LANs). Terminal 102 is not limited to PCs, mobile phones, tablets, etc. The SCR upstream temperature measurement method of this application embodiment can be executed by server 104, by terminal 102, or by both server 104 and terminal 102. The execution of the SCR upstream temperature measurement method of this application embodiment by terminal 102 can also be executed by a client installed on it.

[0028] Taking the SCR upstream temperature measurement method in this embodiment as an example, which is executed by terminal 102 and / or server 104, Figure 2 This is a schematic flowchart of an optional SCR upstream temperature measurement method according to an embodiment of this application, as shown below. Figure 2 As shown, the process of this method may include the following steps:

[0029] S202. Obtain abnormal heating mode switching conditions;

[0030] The technical solution that uses a temperature sensor connected to the test bench wiring harness to measure the upstream temperature of the SCR (Selective Catalytic Reduction) system has several drawbacks. The wiring harness itself is often too long, typically around 10 meters, and variations in the materials of the harness and connectors can lead to significant deviations in the resistance of other components in the circuit. These deviations can cause inaccuracies in the calculated upstream temperature of the SCR, resulting in abnormal engine heating mode switching and ultimately, excessive emissions.

[0031] The inventors discovered that the aforementioned abnormal heating mode switching phenomenon has two main causes. First, it is consistently present during vehicle operation. This is because existing solutions suffer from the fixed factor of excessively long wiring harnesses in the vehicle or test bench, leading to significant deviations in other resistances along the circuit. The presence of these resistances causes inaccurate calculations of the upstream temperature of the SCR. Second, this abnormal heating mode switching phenomenon also occurs randomly during vehicle use. This is because connectors and / or other electronic components in the aforementioned measurement circuit inevitably suffer from abnormal aging, loosening, or damage. This problem also leads to significant deviations in other resistances along the circuit, causing inaccurate calculations of the upstream temperature of the SCR. This deviation results in abnormal engine heating mode switching, leading to excessive emissions. Moreover, this problem can occur at any point during vehicle operation.

[0032] For example, Figure 3 This is a circuit diagram of the existing ECU and temperature sensor for measuring the upstream temperature of the SCR. In the current ECU internal circuit, the resistance value of the wiring harness has a significant impact on the temperature sensor's measurement of the upstream temperature of the SCR. The inventors have found that if the wiring harness resistance reaches 5Ω, it will cause an 8°C deviation in the measured temperature. The above two issues will cause fluctuations in the wiring harness resistance value, resulting in a large deviation in the measured temperature. This deviation will cause abnormal switching of the engine heating mode, which in turn will lead to excessive emissions.

[0033] Therefore, in this application, in order to solve the above two problems, abnormal situations of heating mode switching are obtained; the above abnormal situations of heating mode switching are obtained in real time, that is, the abnormal situations of heating mode switching are continuously obtained throughout the entire working process of the car.

[0034] It is understood that if the heating mode switching abnormality is normal, it indicates that the vehicle does not have a technical problem of abnormal measurement of the upstream temperature value of the SCR; when the heating mode switching abnormality is abnormal, it indicates that the vehicle has a technical problem of abnormal measurement of the upstream temperature value of the SCR. Therefore, if the heating mode switching is normal, the heating mode switching abnormality is reacquired; if the heating mode switching is abnormal, the process proceeds to step S204.

[0035] S204. If the heating mode switching is abnormal, short-circuit the temperature sensor and obtain the line resistance;

[0036] As shown above, when the heating mode switches abnormally, it indicates a technical problem of abnormal measurement of the upstream temperature value of the SCR in the vehicle. The above technical problem is due to the large deviation of other resistors in the circuit. The presence of these resistors will cause the calculation deviation of the upstream temperature of the SCR. This deviation will cause the engine heating mode to switch abnormally, which in turn will lead to excessive emissions. In the existing technology, the temperature sensor is often connected in series in the circuit. In this case, in order to eliminate the influence of the internal resistance of the temperature sensor on the circuit resistance and to accurately measure the circuit resistance, the temperature sensor is short-circuited to obtain the circuit resistance.

[0037] S206. Obtain the temperature sensor resistance based on the circuit resistance;

[0038] For example, after obtaining the line resistance, the circuit parameters of the entire internal circuit can be obtained through the controller, and then the formula can be used. Calculate the resistance of the temperature sensor; where U p =+5V, R p = 1kΩ, U0 is measured by the controller, R w R is the line resistance. s This is the resistance of the temperature sensor. It is understandable that the above U... p R p The specific values ​​of these parameters are the electrical parameter values ​​determined based on the analytical circuit described above. In other types of analytical circuits, U... p R p Other parameters may be taken from the electronic components in the analytical circuit without departing from the scope of protection of this application.

[0039] S208. Determine the accurate temperature measurement value based on the resistance of the temperature sensor.

[0040] Determine the resistance R of the temperature sensor s After U0, the accurate temperature measurement value is determined by consulting the temperature-resistance characteristic table of the current temperature sensor.

[0041]

[0042] Table 1. Temperature-resistance characteristics of temperature sensors

[0043] For example, Table 1 is a temperature-resistance characteristic table of an optional temperature sensor according to an embodiment of this application.

[0044] The above technical solution identifies abnormal heating mode switching. If the heating mode switches abnormally, the temperature sensor is short-circuited to obtain the line resistance. The temperature sensor resistance is obtained based on the line resistance. The accurate temperature measurement value is determined based on the temperature sensor resistance. This solves the technical problem of abnormal engine heating mode switching caused by excessive resistance deviation in the line of the existing SCR upstream temperature measurement method, and achieves the technical effect of accurately measuring the SCR upstream temperature and avoiding abnormal engine heating mode switching.

[0045] As an exemplary embodiment, if the heating mode switching is abnormal, the temperature sensor is short-circuited before obtaining the line resistance: if the heating mode switching is abnormal, the line resistance is corrected; the abnormal heating mode switching condition is obtained; if the heating mode switching is normal, the voltage of the temperature measurement circuit is obtained; and the temperature measurement value is determined based on the temperature measurement circuit voltage.

[0046] The above solution, since it is unavoidable to short-circuit the temperature sensor in steps S202 to S208, will increase the detection time of the entire control process and may cause unexpected problems in the entire working circuit. To avoid these two problems, if the heating mode jumps abnormally, the circuit resistance is corrected; the abnormal heating mode jump situation is obtained; if the heating mode jumps normally, the voltage of the temperature measurement circuit is obtained; and the temperature measurement value is determined based on the voltage of the temperature measurement circuit.

[0047] The above settings simplify the entire control process.

[0048] As an exemplary embodiment, the temperature measurement circuit further includes an adjusting resistor connected in parallel with the line; the step of correcting the line resistance if the heating mode jumps abnormally includes controlling the opening / closing of the adjusting resistor.

[0049] It is understandable that when the regulating resistor connected in parallel with the line is connected, it can reduce the total resistance of the line. Based on this, by controlling the opening / closing of the regulating resistor connected in parallel with the resistor, the total resistance value of the line under abnormal conditions is reduced. The above setting can reduce the resistance deviation of the line, such as the wiring harness and connectors. When the reduced total resistance value does not affect the judgment condition of the engine heating mode switching, the voltage of the temperature measurement circuit is obtained. The temperature measurement value is determined based on the voltage of the temperature measurement circuit. If the reduced total resistance value still affects the judgment condition of the engine heating mode switching, then steps S202 to S208 are executed.

[0050] It is understood that the regulating resistor can be set to one or more. When the regulating resistor is set to one, it can be set to a variable resistor whose resistance value is adjustable under the control of the controller, so that the resistance value of the variable resistor can be controlled by the controller to correct the line resistance. When the regulating resistor is set to multiple, it can be set to multiple regulating resistors connected in parallel with the line respectively. It is understood that the above-mentioned multiple regulating resistors can be connected in parallel with the line individually as regulating resistor loops, or they can be connected in parallel with the line in a setting of at least one regulating resistor loop including at least two regulating resistors connected in series. No specific limitation is made here.

[0051] Based on this, as an exemplary embodiment, the control of the regulating resistor's disconnection / connection includes: connecting one regulating resistor; obtaining a heating mode switching abnormality; if the heating mode switching is abnormal, connecting another regulating resistor until the heating mode switching is normal or all of the regulating resistors are in a connected state.

[0052] As an exemplary embodiment, the temperature measurement circuit further includes a shorter circuit to short-circuit the temperature sensor.

[0053] As an exemplary embodiment, the temperature measurement circuit further includes a current testing unit to detect the circuit current; obtaining the temperature sensor resistance based on the line resistance includes: determining the total circuit resistance based on the circuit current and the temperature measurement circuit voltage; and determining the temperature sensor resistance based on the total circuit resistance.

[0054] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM (Read-Only Memory) / RAM (Random Access Memory), magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0055] According to another aspect of the embodiments of this application, an SCR upstream temperature measuring device for implementing the above-described SCR upstream temperature measuring method is also provided. Figure 4 This is a schematic diagram of an SCR upstream temperature measuring device according to an embodiment of this application, as shown below. Figure 4 As shown, the device may include:

[0056] Heating mode switching abnormality acquisition module 402 is used to acquire heating mode switching abnormality;

[0057] The line resistance acquisition module 404 short-circuit the temperature sensor to acquire the line resistance if the heating mode switching is abnormal.

[0058] Temperature sensor resistance acquisition module 406 acquires the temperature sensor resistance based on the line resistance.

[0059] The accurate temperature measurement value determination module 408 determines the accurate temperature measurement value based on the resistance of the temperature sensor.

[0060] It should be noted that the heating mode jump abnormality acquisition module 402 in this embodiment can be used to execute the above step S202, the line resistance acquisition module 404 in this embodiment can be used to execute the above step S204, the temperature sensor resistance acquisition module 406 in this embodiment can be used to execute the above step S206, and the accurate temperature measurement value determination module 408 in this embodiment can be used to execute the above step S208.

[0061] It should be noted that the examples and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the content disclosed in the above embodiments. It should also be noted that the above modules, as part of a device, can operate in environments such as... Figure 1 The hardware environment shown can be implemented through software or hardware, and the hardware environment includes the network environment.

[0062] Figure 5 This is a structural block diagram of an optional electronic device according to an embodiment of this application, such as... Figure 5 As shown, it includes a processor 502, a communication interface 504, a memory 506, and a communication bus 508. The processor 502, communication interface 504, and memory 506 communicate with each other via the communication bus 508.

[0063] Memory 506 is used to store computer programs;

[0064] When processor 502 executes a computer program stored in memory 506, it performs the following steps:

[0065] Detect abnormal situations during heating mode switching;

[0066] If the heating mode switches abnormally, short-circuit the temperature sensor and obtain the line resistance;

[0067] The resistance of the temperature sensor is obtained from the circuit resistance.

[0068] The accurate temperature measurement value is determined based on the resistance of the temperature sensor.

[0069] According to another aspect of the embodiments of this application, an electronic device for implementing the above-described SCR upstream temperature measurement method is also provided. The electronic device may be a server, a terminal, or a combination thereof.

[0070] Figure 5 This is a structural block diagram of an optional electronic device according to an embodiment of this application, such as... Figure 5 As shown, it includes a processor 502, a communication interface 504, a memory 506, and a communication bus 508. The processor 502, communication interface 504, and memory 506 communicate with each other via the communication bus 508.

[0071] Optionally, in this embodiment, the communication bus can be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. This communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0072] The communication interface is used for communication between the aforementioned electronic devices and other devices.

[0073] The memory may include RAM, or non-volatile memory, such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0074] As an example, such as Figure 5 As shown, the memory 502 may include, but is not limited to, the heating mode jump abnormality acquisition module 402, the line resistance acquisition module 404, the temperature sensor resistance acquisition module 406, and the accurate temperature measurement value determination module 408 in the SCR upstream temperature measurement device. It may also include, but is not limited to, other module units in the SCR upstream temperature measurement device, which will not be described in detail in this example.

[0075] The processors mentioned above can be general-purpose processors, including but not limited to: CPU (Central Processing Unit), NP (Network Processor), etc.; they can also be DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0076] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0077] Those skilled in the art will understand that Figure 5 The structure shown is for illustrative purposes only. The device that implements the above-mentioned SCR upstream temperature measurement method can be a terminal device, such as a smartphone (e.g., Android phone, iOS phone), tablet computer, PDA, mobile Internet Device (MID), PAD, etc. Figure 5 This does not limit the structure of the aforementioned electronic device. For example, the terminal device may also include components that are more... Figure 5 The more or fewer components shown (such as network interfaces, display devices, etc.), or having the same Figure 5 The different configurations shown.

[0078] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a computer-readable storage medium, which may include: flash drive, ROM, RAM, disk or optical disk, etc.

[0079] According to another aspect of the embodiments of this application, a storage medium is also provided. Optionally, in this embodiment, the storage medium can be used to execute program code for an SCR upstream temperature measurement method.

[0080] Optionally, in this embodiment, the storage medium may be located on at least one of the network devices in the network shown in the above embodiment.

[0081] Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps:

[0082] Detect abnormal situations during heating mode switching;

[0083] If the heating mode switches abnormally, short-circuit the temperature sensor and obtain the line resistance;

[0084] The resistance of the temperature sensor is obtained from the circuit resistance.

[0085] The accurate temperature measurement value is determined based on the resistance of the temperature sensor.

[0086] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated in this embodiment.

[0087] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing program code, such as USB flash drives, ROMs, RAMs, portable hard drives, magnetic disks, or optical disks.

[0088] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0089] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more electronic devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0090] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0092] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the solution provided in this embodiment, depending on actual needs.

[0093] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0094] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0095] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for measuring the upstream temperature of a selective catalytic reduction (SCR) technology, wherein the upstream of the SCR technology includes a temperature measurement circuit for controlling a heating mode, the temperature measurement circuit including a power supply, wiring, and a temperature sensor connected in series, characterized in that, The measurement method includes: Detect abnormal situations during heating mode switching; If the heating mode switches abnormally, short-circuit the temperature sensor and obtain the line resistance; The resistance of the temperature sensor is obtained from the circuit resistance. Determine the accurate temperature measurement value based on the resistance of the temperature sensor; If the heating mode switching is abnormal, the temperature sensor is short-circuited. Before obtaining the line resistance, the following steps are also taken: if the heating mode switching is abnormal, the line resistance is corrected; the abnormal heating mode switching condition is obtained; if the heating mode switching is normal, the voltage of the temperature measurement circuit is obtained. The temperature measurement value is determined based on the voltage of the temperature measurement circuit; the temperature measurement circuit also includes an adjustment resistor connected in parallel with the line; the correction of the line resistance if the heating mode jumps abnormally includes: controlling the opening / closing of the adjustment resistor; the control of the opening / closing of the adjustment resistor includes: connecting one adjustment resistor; obtaining the abnormal heating mode jump situation; if the heating mode jumps abnormally, connecting another adjustment resistor again until the heating mode jumps normally or all of the adjustment resistors are in the connected state.

2. The upstream temperature measurement method for selective catalytic reduction technology as described in claim 1, characterized in that, The number of adjustable resistors is multiple, and the temperature measurement circuit also includes control switches corresponding to the multiple adjustable resistors.

3. The upstream temperature measurement method for selective catalytic reduction technology as described in claim 1, characterized in that, The temperature measurement circuit also includes a shorter circuit to short-circuit the temperature sensor.

4. The upstream temperature measurement method for selective catalytic reduction technology as described in claim 1, characterized in that, The temperature measurement circuit also includes a current testing unit to detect the circuit current; The step of obtaining the temperature sensor resistance based on the line resistance includes: Determine the total resistance of the circuit by measuring the circuit voltage based on the circuit current and temperature. The resistance of the temperature sensor is determined based on the total resistance of the circuit.

5. An upstream temperature measuring device for selective catalytic reduction technology, characterized in that, The method for measuring the upstream temperature of a selective catalytic reduction technology as described in claim 1 includes: The heating mode switching anomaly acquisition module is used to acquire heating mode switching anomalies. If the heating mode switching is abnormal, the line resistance acquisition module will short-circuit the temperature sensor to acquire the line resistance. Temperature sensor resistance acquisition module, which obtains the temperature sensor resistance based on the circuit resistance; The accurate temperature measurement value determination module determines the accurate temperature measurement value based on the resistance of the temperature sensor.

6. An electronic device comprising a processor, a communication interface, a memory, and a communication bus, wherein, The processor, the communication interface, and the memory communicate with each other via the communication bus, characterized in that... The memory is used to store computer programs; The processor is configured to execute the upstream temperature measurement method steps of the selective catalytic reduction technology according to any one of claims 1 to 4 by running the computer program stored in the memory.

7. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, wherein the computer program is configured to execute the upstream temperature measurement method steps of the selective catalytic reduction technology according to any one of claims 1 to 4 when it is run.

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