Urea box temperature sensor tampering identification method and device, vehicle and storage medium

Abstract

The invention discloses a urea box temperature sensor tampering identification method, a urea box temperature sensor tampering identification device, a vehicle and a computer storage medium, and the urea box temperature sensor tampering identification method comprises the following steps: when the vehicle is in a heat engine state and the vehicle runs stably, heating a urea solution in a urea box, the theoretical temperature rise of the urea solution in the urea box is obtained; measuring the actual temperature rise of the urea solution in the urea box through a urea box temperature sensor; calculating a first deviation factor according to the theoretical temperature rise and the actual temperature rise; and whether the urea box temperature sensor of the vehicle in the heat engine state is tampered or not is judged based on the first deviation factor. According to the tampering identification method for the urea box temperature sensor, whether the urea box temperature sensor is tampered or not can be detected after the vehicle is heated.

Description

Technical Field

[0001] The present invention relates to the technical field of urea tank tampering detection, and in particular to a urea tank temperature sensor tampering identification method, a urea tank temperature sensor tampering identification device, a vehicle and a computer storage medium. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Urea tanks are equipment used by diesel vehicles to store urea solution, which reduces nitrogen oxide (NOx) emissions in exhaust gas through selective catalytic reduction (SCR) technology. Some car owners may tamper with the urea tank to reduce the amount of urea solution used, thereby reducing operating costs. However, tampering with the urea tank will result in greater nitrogen oxide pollution in diesel vehicle exhaust, and tampering with the urea tank may cause damage to the urea nozzle and urea pump.

[0004] In the related art, when the engine is in a cold start state, the ECU can obtain the model temperature value of the urea tank through model calculation, and then compare the actual value measured by the current urea tank sensor with the model temperature value to determine whether the urea tank temperature sensor has been tampered with.

[0005] However, the detection method in the related art can only detect whether the urea tank temperature sensor has been tampered with in a cold start state, but cannot detect whether the urea tank temperature sensor has been tampered with after the vehicle is heated up. Summary of the invention

[0006] The purpose of the present invention is to at least solve the problem that the related art cannot detect whether the urea tank temperature sensor has been tampered with after the vehicle is heated up. This purpose is achieved through the following technical solutions:

[0007] A first aspect of the present invention provides a tampering identification method for a urea tank temperature sensor, comprising: when a vehicle is in a hot engine state and the vehicle runs stably, heating a urea solution in a urea tank to obtain a theoretical temperature rise of the urea solution in the urea tank; measuring an actual temperature rise of the urea solution in the urea tank by a urea tank temperature sensor; calculating a first deviation factor according to the theoretical temperature rise and the actual temperature rise; and judging whether the urea tank temperature sensor of the vehicle in the hot engine state has been tampered with based on the first deviation factor.

[0008] The tampering identification method of the urea box temperature sensor of the present invention obtains the theoretical temperature rise of the urea solution in the urea box by heating the urea solution in the urea box, and measures the actual temperature rise of the urea solution in the urea box by the urea box temperature sensor. The theoretical temperature rise and the actual temperature rise are calculated to reflect the first deviation factor of the relationship between the theoretical temperature rise and the actual temperature rise. When the first deviation factor is large, it means that the actual temperature rise of the urea solution in the urea box measured by the urea box temperature sensor has a large deviation from the theoretical temperature rise of the urea solution, and the risk of the urea box temperature sensor being tampered with is large; when the first deviation factor is small, it means that the deviation between the actual temperature rise of the urea solution measured by the urea box temperature sensor and the theoretical temperature rise is small, that is, the deviation is within a reasonable range, and the risk of the urea box temperature sensor being tampered with is small. Therefore, based on the first deviation factor, it can be judged whether the urea box temperature sensor of the vehicle in the hot engine state is tampered with.

[0009] In some embodiments, when the vehicle is in a hot engine state and the vehicle runs stably, before the urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank, the method for identifying tampering with the urea tank temperature sensor further includes: obtaining a deviation fluctuation of an engine speed, a deviation fluctuation of an engine torque, and a deviation fluctuation of an engine antifreeze temperature; when a stability condition is met, it is determined that the vehicle runs stably, wherein the stability condition includes: a deviation fluctuation of the engine is less than or equal to a first threshold, and a deviation fluctuation of the engine torque is less than or equal to a second threshold, and a temperature deviation fluctuation of the antifreeze is less than or equal to a third threshold.

[0010] In some embodiments, before the urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank when the vehicle is in a hot engine state and the vehicle is running stably, the method for identifying tampering of the urea tank temperature sensor further includes: when the stability condition is not met, monitoring the deviation fluctuation of the engine speed, the deviation fluctuation of the engine torque and the deviation fluctuation of the temperature of the engine antifreeze until the stability condition is met.

[0011] In some embodiments, the method for identifying tampering of the urea tank temperature sensor further includes: in response to a power-on signal and when the vehicle is in a cold start state, obtaining an engine oil temperature, an ambient temperature, an antifreeze temperature, and an intake air temperature; calculating a weighted average temperature according to the engine oil temperature, the ambient temperature, the antifreeze temperature, and the intake air temperature; measuring the actual temperature of the urea solution in the urea tank by the urea tank temperature sensor; calculating a second deviation factor according to the weighted average temperature and the actual temperature; and judging whether the urea tank temperature sensor of the vehicle in the cold start state has been tampered with based on the second deviation factor.

[0012] In some implementations, the method for identifying tampering of the urea tank temperature sensor further includes: comprehensively determining whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor.

[0013] In some embodiments, the step of comprehensively judging whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor includes: calculating a weighted average of the first deviation factor and the second deviation factor to obtain a third deviation factor; comparing the third deviation factor with a fourth threshold to obtain a comparison result; when the comparison result shows that the third deviation factor is greater than the fourth threshold, it is judged that the urea tank temperature sensor has been tampered with; when the comparison result shows that the third deviation factor is less than or equal to the fourth threshold, it is judged that the urea tank temperature sensor has not been tampered with.

[0014] In some embodiments, the step of comprehensively judging whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor includes: when a first judgment condition is met, judging that the urea tank temperature sensor has not been tampered with, wherein the first judgment condition is: judging that the urea tank temperature sensor of the vehicle in the hot engine state has not been tampered with, and judging that the urea tank temperature sensor of the vehicle in the cold start state has not been tampered with; when a second judgment condition is met, judging that the urea tank temperature sensor has been tampered with, wherein the second judgment condition is: judging that the urea tank temperature sensor of the vehicle in the hot engine state has not been tampered with. The urea tank temperature sensor of the vehicle in the hot engine state is tampered with, and it is judged that the urea tank temperature sensor of the vehicle in the cold start state is tampered with; the comprehensive judgment based on the first deviation factor and the second deviation factor whether the urea tank temperature sensor of the vehicle is tampered with includes: when a third judgment condition is met, comprehensively judging whether the urea tank temperature sensor of the vehicle is tampered with based on the first deviation factor and the second deviation factor, wherein the third judgment condition is: judging that the urea tank temperature sensor of the vehicle in the hot engine state or the vehicle in the cold start state is tampered with.

[0015] The second aspect of the present invention proposes a tamper identification device for a urea tank temperature sensor, comprising a heating module, a measuring module, a calculating module and a judging module. The heating module is used to heat the urea solution in the urea tank when the vehicle is in a hot engine state and the vehicle is running stably, so as to obtain a theoretical temperature rise of the urea solution in the urea tank; the measuring module is used to measure the actual temperature rise of the urea solution in the urea tank through a urea tank temperature sensor; the calculating module is used to calculate a first deviation factor according to the theoretical temperature rise and the actual temperature rise; the judging module is used to judge whether the urea tank temperature sensor of the vehicle in the hot engine state has been tampered with based on the first deviation factor.

[0016] A third aspect of the present invention provides a vehicle, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the method for identifying tampering with a urea tank temperature sensor as described in the first aspect above is implemented.

[0017] A fourth aspect of the present invention provides a computer storage medium having computer-readable instructions stored thereon. When the computer-readable instructions are read by one or more processors, the one or more processors execute the urea tank temperature sensor tampering identification method as described in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 It is a flow chart of a method for identifying tampering of a urea tank temperature sensor according to an embodiment of the present invention;

[0020] Figure 2 This is a flow chart of a method for identifying tampering of a urea tank temperature sensor according to another embodiment of the present invention;

[0021] Figure 3 A flowchart of a method for identifying tampering of a urea tank temperature sensor according to another embodiment of the present invention;

[0022] Figure 4 This is a flow chart of a method for identifying tampering of a urea tank temperature sensor according to another embodiment of the present invention;

[0023] Figure 5 This is a structural block diagram of a urea tank temperature sensor tampering identification device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0025] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0026] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0027] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0028] Urea tanks are equipment used by diesel vehicles to store urea solution, which reduces nitrogen oxide (NOx) emissions in exhaust gas through selective catalytic reduction (SCR) technology. Some car owners may tamper with the urea tank and send wrong signals to the ECU through cheating to reduce the use of urea solution, thereby reducing operating costs. However, tampering with the urea tank will lead to greater pollution of nitrogen oxides in diesel vehicle exhaust, and tampering with the urea tank may cause damage to the urea nozzle and urea pump.

[0029] In the related art, when the engine is in a cold start state, the ECU can obtain the model temperature value of the urea tank through model calculation, and then compare the actual value measured by the current sensor with the model temperature value to determine whether the urea tank temperature sensor has been tampered with.

[0030] However, the detection method in the related art can only detect whether the urea tank temperature sensor has been tampered with in a cold start state, but cannot detect whether the urea tank temperature sensor has been tampered with after the vehicle is heated up.

[0031] In order to at least solve the problem that the related art cannot detect whether the urea tank temperature sensor has been tampered with after the vehicle is heated up, an embodiment of the present invention provides a urea tank temperature sensor tampering identification method, which can detect whether the urea tank temperature sensor has been tampered with after the vehicle is heated up.

[0032] like Figure 1As shown, the tampering identification method of the urea tank temperature sensor of the embodiment of the present invention includes: S100, when the vehicle is in a hot engine state and the vehicle runs stably, heating the urea solution in the urea tank to obtain a theoretical temperature rise of the urea solution in the urea tank; S200, measuring the actual temperature rise of the urea solution in the urea tank by the urea tank temperature sensor; S300, calculating a first deviation factor according to the theoretical temperature rise and the actual temperature rise; S400, judging whether the urea tank temperature sensor of the vehicle in the hot engine state has been tampered with based on the first deviation factor.

[0033] S100: When the vehicle is in a hot engine state and the vehicle is running stably, the urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank.

[0034] The hot engine state refers to the temperature at which the engine reaches normal operating conditions.

[0035] When the vehicle is running stably, the fluctuations of various parameters of the vehicle are small, and the accuracy of judging whether the vehicle has been tampered with is high.

[0036] The urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank. Since the vehicle runs stably, the theoretical temperature rise of the urea solution in the urea tank approaches the actual temperature rise.

[0037] In some optional embodiments, the urea solution in the urea tank is heated, and the theoretical temperature rise T2 of the urea solution can be calculated by the following formula:

[0038] Q=C 尿 *m 尿 *T2

[0039] Where Q is the heat released by heating, C 尿 is the specific heat capacity of urea solution, m 尿 is the mass of urea solution.

[0040] In some further embodiments, the urea solution in the urea tank is heated by the antifreeze in the engine, and the heat released by the antifreeze is calculated by the following formula:

[0041] Q=C 冻 *m 冻 *ΔT

[0042] Among them, C 冻 is the specific heat capacity of the antifreeze, m 冻 is the mass of the antifreeze, ΔT is the temperature drop of the antifreeze, and the temperature drop of the antifreeze can be measured by the antifreeze temperature sensor.

[0043] In some further embodiments, the urea solution in the urea tank is heated by a heater, and the heat released by the heater is calculated by the following formula:

[0044] Q=I 2 *R*t

[0045] Where I is the current passing through the heater, R is the resistance of the heater, and t is the heating time of the heater.

[0046] S200: measuring the actual temperature rise of the urea solution in the urea tank by using the urea tank temperature sensor.

[0047] When the urea tank temperature sensor is tampered with, the actual temperature rise of the urea solution measured by the urea tank temperature sensor is a cheated temperature rise data, that is, the actual temperature rise of the urea solution in the urea tank measured by the urea tank temperature sensor deviates greatly from the theoretical temperature rise of the urea solution.

[0048] When the urea tank temperature sensor has not been tampered with, the deviation between the actual temperature rise of the urea solution measured by the urea tank temperature sensor and the theoretical temperature rise is small.

[0049] Therefore, whether the urea tank temperature sensor has been tampered with can be determined through the real temperature rise and the actual temperature rise.

[0050] S300, calculating a first deviation factor according to the theoretical temperature rise and the actual temperature rise.

[0051] The first deviation factor is obtained from the theoretical temperature rise and the actual temperature rise. The first deviation factor can reflect the relationship between the theoretical temperature rise and the actual temperature rise.

[0052] In some optional embodiments, the first deviation factor is |(T2-T3) / T2|.

[0053] Among them, T2 is the theoretical temperature rise, T3 is the actual temperature rise, and || is the absolute value.

[0054] By taking the absolute value of (T2-T3) / T2, the first deviation factor is made a positive number, so that it is possible to avoid processing the value of the first deviation factor in subsequent steps, thereby simplifying subsequent steps.

[0055] S400: Determine whether a urea tank temperature sensor of a vehicle in a hot engine state has been tampered with based on a first deviation factor.

[0056] The first deviation factor can reflect the relationship between the theoretical temperature rise and the actual temperature rise. The first deviation factor can be used to determine whether the urea tank temperature sensor of the vehicle in the hot engine state has been tampered with.

[0057] In some optional embodiments, S400, the step of judging whether the urea tank temperature sensor of the vehicle in the hot engine state has been tampered with based on the first deviation factor, includes: comparing the first deviation factor with the hot engine judgment threshold; when the first deviation factor is greater than the hot engine judgment threshold, it means that the actual temperature rise of the urea solution in the urea tank measured by the urea tank temperature sensor has a large deviation from the theoretical temperature rise of the urea solution, and therefore, the risk of cheating in the hot engine state is greater, that is, the risk of tampering with the urea tank temperature sensor is greater; when the first deviation factor is less than or equal to the hot engine judgment threshold, it means that the deviation between the actual temperature rise of the urea solution measured by the urea tank temperature sensor and the theoretical temperature rise is small, that is, the deviation is within a reasonable range, and therefore, the risk of cheating in the hot engine state is smaller, that is, the risk of not tampering with the urea tank temperature sensor is greater. Thus, judging whether the urea tank temperature sensor of the vehicle in the hot engine state has been tampered with based on the first deviation factor is achieved through the hot engine judgment threshold.

[0058] As some examples, the thermal engine determination threshold is 1.

[0059] The urea tank temperature sensor tampering identification method of the embodiment of the present invention heats the urea solution in the urea tank to obtain the theoretical temperature rise of the urea solution in the urea tank, and measures the actual temperature rise of the urea solution in the urea tank by the urea tank temperature sensor. The theoretical temperature rise and the actual temperature rise are calculated to reflect the first deviation factor of the relationship between the theoretical temperature rise and the actual temperature rise. When the first deviation factor is large, it means that the actual temperature rise of the urea solution in the urea tank measured by the urea tank temperature sensor deviates greatly from the theoretical temperature rise of the urea solution, and the urea tank temperature sensor has a greater risk of being tampered with. When the first deviation factor is small, it means that the deviation between the actual temperature rise of the urea solution measured by the urea tank temperature sensor and the theoretical temperature rise is small, that is, the deviation is within a reasonable range, and the urea tank temperature sensor has a lower risk of being tampered with. Therefore, based on the first deviation factor, it can be judged whether the urea tank temperature sensor of the vehicle in the hot engine state has been tampered with.

[0060] In some embodiments, at S100, when the vehicle is in a hot engine state and the vehicle is running stably, before the urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank, the method for identifying tampering of the urea tank temperature sensor further includes:

[0061] Acquiring a deviation fluctuation of the engine speed, a deviation fluctuation of the engine torque, and a deviation fluctuation of the temperature of the engine antifreeze fluid;

[0062] When the stability conditions are met, it is determined that the vehicle operation is stable, wherein the stability conditions include: the deviation fluctuation of the engine is less than or equal to a first threshold, and the deviation fluctuation of the engine torque is less than or equal to a second threshold, and the temperature deviation fluctuation of the antifreeze is less than or equal to a third threshold.

[0063] The deviation fluctuation of the engine is less than or equal to the first threshold, and the deviation fluctuation of the engine torque is less than or equal to the second threshold. This indicates that the current operating state of the engine is stable. The temperature deviation fluctuation of the engine antifreeze is less than or equal to the third threshold. This indicates that the vehicle thermal engine state is stable. Therefore, the deviation fluctuation of the engine is less than or equal to the first threshold, and the deviation fluctuation of the engine torque is less than or equal to the second threshold, and the temperature deviation fluctuation of the engine antifreeze is less than or equal to the third threshold, indicating that the vehicle operating condition is stable.

[0064] As some examples, the first threshold is 50 rpm (revolutions per minute), the second threshold is 50 N·m (Newton meters), and the third threshold is 5 degrees Celsius.

[0065] Optionally, the step of obtaining the deviation fluctuation of the engine speed includes: obtaining the engine speed in real time and recording the engine speed data; and analyzing the speed data to obtain the deviation fluctuation of the speed.

[0066] Optionally, the step of obtaining the deviation fluctuation of the torque of the engine includes: obtaining the torque of the engine in real time and recording the torque data of the engine; and analyzing the torque data to obtain the deviation fluctuation of the rotation speed.

[0067] Optionally, the step of obtaining the deviation fluctuation of the temperature of the engine antifreeze includes: obtaining the temperature of the antifreeze in the engine in real time, and recording the temperature data of the antifreeze in the engine; analyzing the temperature data of the antifreeze to obtain the deviation fluctuation of the temperature of the engine antifreeze.

[0068] In some embodiments, at S100, when the vehicle is in a hot engine state and the vehicle is running stably, before the urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank, the method for identifying tampering of the urea tank temperature sensor further includes:

[0069] obtaining the temperature of the antifreeze liquid in the engine, and comparing the temperature of the antifreeze liquid with a fifth threshold;

[0070] When the temperature of the antifreeze liquid is greater than the fifth threshold, it is determined that the vehicle is in a hot engine state.

[0071] When the vehicle is in the warm-up process, the temperature of the antifreeze fluid will increase. When the temperature of the antifreeze fluid is greater than the fifth threshold, it indicates that the vehicle is in the warm-up state.

[0072] When the temperature of the antifreeze liquid is higher, the effect of heating the urea solution is better.

[0073] As some examples, the fifth threshold is 80 degrees Celsius.

[0074] In some embodiments, when the vehicle is in a hot engine state and the vehicle is running stably, before the urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank, the method for identifying tampering of the urea tank temperature sensor further includes:

[0075] When the stability condition is not satisfied, the deviation fluctuation of the engine speed, the deviation fluctuation of the engine torque, and the deviation fluctuation of the temperature of the engine antifreeze fluid are monitored until the stability condition is satisfied.

[0076] like Figure 2 As shown, in some embodiments, the method for identifying tampering of the urea tank temperature sensor also includes: S500, in response to a power-on signal, and when the vehicle is in a cold start state, obtaining the engine oil temperature, the ambient temperature, the antifreeze temperature, and the intake air temperature; S600, calculating a weighted average temperature according to the engine oil temperature, the ambient temperature, the antifreeze temperature, and the intake air temperature; S700, measuring the actual temperature of the urea solution in the urea tank through the urea tank temperature sensor; S800, calculating a second deviation factor according to the weighted average temperature and the actual temperature; S900, judging whether the urea tank temperature sensor of the vehicle in the cold start state has been tampered with based on the second deviation factor.

[0077] S500 , in response to a power-on signal and when the vehicle is in a cold start state, obtaining engine oil temperature, ambient temperature, antifreeze temperature, and intake air temperature.

[0078] When the vehicle is cold started, the oil temperature, ambient temperature, antifreeze temperature and intake air temperature are all close to the real temperature of the external environment. In other words, the oil temperature, ambient temperature, antifreeze temperature and intake air temperature can reflect the real temperature of the external environment. The oil temperature, ambient temperature, antifreeze temperature and intake air temperature can be used to determine whether the urea tank temperature sensor has been tampered with when the vehicle is cold started.

[0079] S600: Calculate a weighted average temperature according to the engine oil temperature, the ambient temperature, the antifreeze temperature, and the intake air temperature.

[0080] Calculating the weighted average temperature based on the engine oil temperature, ambient temperature, antifreeze temperature, and intake air temperature can reduce the error and make the weighted average temperature closer to the actual temperature of the external environment.

[0081] The weight of the weighted average temperature can be determined by the accuracy of the oil thermometer, the ambient thermometer, the antifreeze thermometer and the intake air thermometer. For example, if the accuracy of the oil thermometer is high, the oil temperature will have a higher weight when calculating the weighted average temperature. For another example, if the accuracy of the oil thermometer is low, the oil temperature will have a lower weight when calculating the weighted average temperature.

[0082] S700: Measure the actual temperature of the urea solution in the urea tank using the urea tank temperature sensor.

[0083] Since the vehicle is in a cold start state, the actual temperature of the urea solution is the same as the actual temperature of the external environment.

[0084] When the urea tank temperature sensor is tampered with, the actual temperature measured by the urea tank temperature sensor is the cheated temperature data, that is, the actual temperature of the urea solution in the urea tank measured by the urea tank temperature sensor deviates greatly from the weighted average temperature.

[0085] When the urea tank temperature sensor has not been tampered with, the deviation between the actual temperature measured by the urea tank temperature sensor and the weighted average temperature is small.

[0086] S800: Calculate a second deviation factor according to the weighted average temperature and the actual temperature.

[0087] The second deviation factor is obtained from the weighted average temperature and the actual temperature. Therefore, the second deviation factor can reflect the relationship between the weighted average temperature and the actual temperature.

[0088] Optionally, the second deviation factor is |(T 11 -T) / T 11 |.

[0089] Among them, T 11 is the actual temperature, T is the weighted average temperature, and || is the absolute value. 11 -T) / T 11 The absolute value is taken to make the second deviation factor a positive number, so as to avoid processing the value of the second deviation factor in subsequent steps, thereby simplifying subsequent steps.

[0090] S900: Determine whether a urea tank temperature sensor of the vehicle in a cold start state has been tampered with based on the second deviation factor.

[0091] The second deviation factor can reflect the relationship between the weighted average temperature and the actual temperature. The second deviation factor can be used to determine whether the urea tank temperature sensor of the vehicle in the cold start state has been tampered with.

[0092] In some optional embodiments, S900, the step of judging whether the urea tank temperature sensor of the vehicle in the cold start state has been tampered with based on the second deviation factor, includes: comparing the second deviation factor with the cold start judgment threshold; when the second deviation factor is greater than the cold start judgment threshold, it means that the deviation between the actual temperature of the urea solution in the urea tank measured by the urea tank temperature sensor and the weighted average temperature is large, and the risk of cheating of the urea tank of the vehicle in the cold start state is large, that is, the risk of tampering of the urea tank temperature sensor is large; when the second deviation factor is less than or equal to the cold start judgment threshold, it means that the deviation between the actual temperature of the urea solution in the urea tank measured by the urea tank temperature sensor and the weighted average temperature is small, that is, the deviation is within a reasonable range, therefore, the risk of cheating of the urea tank of the vehicle in the cold start state is small, that is, the risk of not tampering with the urea tank temperature sensor is small. Thus, judging whether the urea tank temperature sensor of the vehicle in the cold start state has been tampered with based on the second deviation factor is realized through the cold start judgment threshold.

[0093] In the tampering identification method of the urea tank temperature sensor of the embodiment of the present invention, the weighted average temperature is calculated by the engine oil temperature, the ambient temperature, the antifreeze temperature, and the intake temperature to reduce the error of the weighted average temperature, the actual temperature of the urea solution in the urea tank is measured by the urea tank temperature sensor, and the second deviation factor is calculated according to the weighted average temperature and the actual temperature. The larger the second deviation factor is, the greater the deviation between the actual temperature of the urea solution in the urea tank measured by the urea tank temperature sensor and the weighted average temperature is, and the risk of the urea tank temperature sensor being tampered is greater. The smaller the second deviation factor is, the smaller the deviation between the actual temperature of the urea solution in the urea tank measured by the urea tank temperature sensor and the weighted average temperature is, and the risk of the urea tank temperature sensor being tampered is smaller. Therefore, based on the second deviation factor, it can be judged whether the urea tank temperature sensor of the vehicle in the cold start state has been tampered.

[0094] In the related art, some car owners may further tamper with the urea tank, so that it cheats in some cases and does not cheat in other cases, so as to evade vehicle detection. For example, it does not cheat in the case of cold start, but cheats in the case of hot engine, so that it is judged that the vehicle in the cold start state is not cheated, and the vehicle in the hot engine state is cheated, which makes it difficult to determine whether the urea tank temperature sensor of the vehicle has been tampered.

[0095] For this reason, Figure 3 As shown, in some embodiments, the method for identifying tampering of the urea tank temperature sensor further includes:

[0096] S1000. Comprehensively determine whether a urea tank temperature sensor of the vehicle has been tampered with based on a first deviation factor and a second deviation factor.

[0097] The first deviation factor and the second deviation factor can be used to comprehensively judge the urea tank of the vehicle in the cold start state and the hot engine state, so as to judge whether the urea tank temperature sensor of the vehicle is tampered with.

[0098] In some specific embodiments, S1000, the step of comprehensively judging whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor, includes:

[0099] Calculating a weighted average of the first deviation factor and the second deviation factor to obtain a third deviation factor;

[0100] Comparing the third deviation factor and the fourth threshold value to obtain a comparison result;

[0101] When the comparison result shows that the third deviation factor is greater than the fourth threshold, it is determined that the urea tank temperature sensor has been tampered with;

[0102] When the comparison result shows that the third deviation factor is less than or equal to the fourth threshold, it is determined that the urea tank temperature sensor has not been tampered with.

[0103] The weighted average of the first deviation factor and the second deviation factor is calculated to obtain a third deviation factor. That is, the third deviation factor is the weighted average of the first deviation factor and the second deviation factor, and the third deviation factor can comprehensively reflect whether the urea tank temperature sensor of the vehicle has been tampered with.

[0104] As some examples, the third bias factor = 0.7*first bias factor + 0.3*second bias factor.

[0105] When the comparison result shows that the third deviation factor is greater than the fourth threshold, it means that at least one of the first deviation factor and the second deviation factor is too large, which indicates that in at least one of the cold start situation and the hot engine situation, there is cheating in the urea tank, so it is determined that the urea tank temperature sensor is tampered with.

[0106] When the comparison result shows that the third deviation factor is less than or equal to the fourth threshold value, it may be that both the first deviation factor and the second deviation factor are small, indicating that there is no cheating in the urea tank in both the cold start condition and the hot engine condition, and therefore it is determined that the urea tank temperature sensor has not been tampered with.

[0107] When the comparison result shows that the third deviation factor is less than or equal to the fourth threshold, or the first deviation factor is greater than the hot engine judgment threshold, and the second deviation factor is less than or equal to the cold start judgment threshold, it means that the risk of misjudgment in the hot engine state is high, and the risk of cheating in the urea tank in the hot engine state is low, so it is judged that the urea tank temperature sensor has not been tampered with.

[0108] When the comparison result shows that the third deviation factor is less than or equal to the fourth threshold, it can also be that the first deviation factor is less than or equal to the hot engine judgment threshold, and the second deviation factor is greater than the cold start judgment threshold, it means that the risk of misjudgment in the cold start state is high, and the risk of cheating in the urea tank in the cold start state is low, so it is judged that the urea tank temperature sensor has not been tampered with.

[0109] As some examples, the fourth threshold is 1.

[0110] The method for identifying tampering of the urea tank temperature sensor of the embodiment of the present invention can make a comprehensive judgment through the first deviation factor and the second deviation factor, so as to judge whether the urea tank temperature sensor of the vehicle has been tampered with. In addition, the probability of misjudgment can be reduced, and the accuracy of the method for identifying tampering of the urea tank temperature sensor of the embodiment of the present invention can be improved.

[0111] like Figure 4 As shown, in other embodiments, the step of comprehensively judging whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor includes:

[0112] When the first judgment condition is met, it is judged that the urea tank temperature sensor has not been tampered with, wherein the first judgment condition is: judging that the urea tank temperature sensor of the vehicle in the hot engine state has not been tampered with, and judging that the urea tank temperature sensor of the vehicle in the cold start state has not been tampered with;

[0113] When the second judgment condition is met, it is judged that the urea tank temperature sensor is tampered, wherein the second judgment condition is: it is judged that the urea tank temperature sensor of the vehicle in the hot engine state is tampered, and it is judged that the urea tank temperature sensor of the vehicle in the cold start state is tampered;

[0114] Comprehensively judging whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor includes:

[0115] When the third judgment condition is met, it is comprehensively judged whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor, wherein the third judgment condition is: judging whether the urea tank temperature sensor of the vehicle in the hot engine state or the vehicle in the cold start state has been tampered with.

[0116] It is judged that the urea tank temperature sensor of the vehicle in the hot engine state has not been tampered with, and it is judged that the urea tank temperature sensor of the vehicle in the cold start state has not been tampered with, which means that there is a high probability that the urea tank temperature sensor of the vehicle has not been tampered with, and it is judged that the urea tank temperature sensor has not been tampered with.

[0117] It is judged that the urea tank temperature sensor of the vehicle in the hot engine state is tampered with, and it is judged that the urea tank temperature sensor of the vehicle in the cold start state is tampered with, which means that the probability of the urea tank temperature sensor of the vehicle being tampered with is relatively high, and it is judged that the urea tank temperature sensor is tampered with.

[0118] Judging whether the urea tank temperature sensor of a vehicle in a hot engine state or a vehicle in a cold start state has been tampered with means: judging that the urea tank temperature sensor of a vehicle in a hot engine state has been tampered with, and judging that the urea tank temperature sensor of a vehicle in a cold start state has not been tampered with; or, judging that the urea tank temperature sensor of a vehicle in a hot engine state has not been tampered with, and judging that the urea tank temperature sensor of a vehicle in a cold start state has been tampered with.

[0119] When the third judgment condition is met, the vehicle may have cheating behavior in one of the hot engine state and the cold start state, or the vehicle may have misjudgment in one of the hot engine state and the cold start state. Based on the first deviation factor and the second deviation factor, it is comprehensively judged whether the urea tank temperature sensor of the vehicle has been tampered with, so as to judge whether the urea tank temperature sensor of the vehicle has been tampered with. In addition, the probability of misjudgment can be reduced, and the accuracy of the identification method of tampering of the urea tank temperature sensor of the embodiment of the present invention can be improved.

[0120] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0121] Based on the same inventive concept, the embodiment of the present application also provides a urea tank temperature sensor tampering identification device for implementing the above-mentioned urea tank temperature sensor tampering identification method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in the embodiments of one or more urea tank temperature sensor tampering identification devices provided below can refer to the limitations of the urea tank temperature sensor tampering identification method above, and will not be repeated here.

[0122] like Figure 5As shown, the urea tank temperature sensor tampering identification device according to the embodiment of the present invention includes: a heating module, a measuring module, a calculating module and a judging module.

[0123] The heating module is used to heat the urea solution in the urea tank when the vehicle is in a hot engine state and the vehicle is running stably, so as to obtain a theoretical temperature rise of the urea solution in the urea tank;

[0124] The measuring module is used to measure the actual temperature rise of the urea solution in the urea tank through the urea tank temperature sensor;

[0125] The calculation module is used to calculate the first deviation factor according to the theoretical temperature rise and the actual temperature rise;

[0126] The judging module is used to judge whether a urea tank temperature sensor of a vehicle in a hot engine state has been tampered with based on a first deviation factor.

[0127] In some embodiments, the urea tank temperature sensor tampering identification device further includes an acquisition module and a stability condition determination module.

[0128] The acquisition module is used to acquire the deviation fluctuation of the engine speed, the deviation fluctuation of the engine torque and the deviation fluctuation of the temperature of the engine antifreeze;

[0129] The stability condition determination module is used to determine that the vehicle operation is stable when the stability condition is met, wherein the stability condition includes: the deviation fluctuation of the engine is less than or equal to a first threshold, and the deviation fluctuation of the engine torque is less than or equal to a second threshold, and the temperature deviation fluctuation of the engine antifreeze is less than or equal to a third threshold.

[0130] In some embodiments, the urea tank temperature sensor tampering identification device further includes a monitoring module.

[0131] The monitoring module is used to monitor the deviation fluctuation of the engine speed, the deviation fluctuation of the engine torque and the deviation fluctuation of the temperature of the engine antifreeze when the stability condition is not met, until the stability condition is met.

[0132] In some embodiments, the urea tank temperature sensor tampering identification device further includes:

[0133] An acquisition module, for obtaining engine oil temperature, ambient temperature, antifreeze temperature, and intake air temperature in response to a power-on signal and when the vehicle is in a cold start state;

[0134] An average module is used to calculate the weighted average temperature based on the oil temperature, ambient temperature, antifreeze temperature, and intake air temperature;

[0135] A temperature module is used to measure the actual temperature of the urea solution in the urea tank through a urea tank temperature sensor;

[0136] A temperature calculation module, used for calculating a second deviation factor according to the weighted average temperature and the actual temperature;

[0137] The cold start state judgment module is used to judge whether the urea tank temperature sensor of the vehicle in the cold start state has been tampered with based on the second deviation factor.

[0138] In some embodiments, the urea tank temperature sensor tampering identification device further includes:

[0139] A comprehensive judgment module is used to comprehensively judge whether a urea tank temperature sensor of a vehicle has been tampered with based on a first deviation factor and a second deviation factor.

[0140] In some specific embodiments, the comprehensive judgment module is also used to:

[0141] Calculating a weighted average of the first deviation factor and the second deviation factor to obtain a third deviation factor;

[0142] Comparing the third deviation factor and the fourth threshold value to obtain a comparison result;

[0143] When the comparison result shows that the third deviation factor is greater than the fourth threshold, it is determined that the urea tank temperature sensor has been tampered with;

[0144] When the comparison result shows that the third deviation factor is less than or equal to the fourth threshold, it is determined that the urea tank temperature sensor has not been tampered with.

[0145] In some other embodiments, the comprehensive judgment module is further used to:

[0146] When the first judgment condition is met, it is judged that the urea tank temperature sensor has not been tampered with, wherein the first judgment condition is: judging that the urea tank temperature sensor of the vehicle in the hot engine state has not been tampered with, and judging that the urea tank temperature sensor of the vehicle in the cold start state has not been tampered with;

[0147] When the second judgment condition is met, it is judged that the urea tank temperature sensor is tampered, wherein the second judgment condition is: it is judged that the urea tank temperature sensor of the vehicle in the hot engine state is tampered, and it is judged that the urea tank temperature sensor of the vehicle in the cold start state is tampered;

[0148] Comprehensively judging whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor includes:

[0149] When the third judgment condition is met, it is comprehensively judged whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor, wherein the third judgment condition is: judging whether the urea tank temperature sensor of the vehicle in the hot engine state or the vehicle in the cold start state has been tampered with.

[0150] An embodiment of the present invention further provides a vehicle, the vehicle comprising a memory and a processor, the memory storing a computer program, and the processor implementing the tampering identification method of the urea tank temperature sensor of the above embodiment when executing the computer program.

[0151] Furthermore, a vehicle computer device includes a processor, a memory, an input / output interface (I / O for short) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the above-mentioned urea tank temperature sensor tampering identification method is implemented.

[0152] An embodiment of the present invention further provides a computer storage medium on which computer-readable instructions are stored. When the computer-readable instructions are read by one or more processors, the one or more processors execute the urea tank temperature sensor tampering identification method as described in the above embodiment.

[0153] The logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer-readable storage medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, apparatus, or device and execute instructions), or in conjunction with such instruction execution system, apparatus, or device. For purposes of this specification, a "computer-readable storage medium" may be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such instruction execution system, apparatus, or device. More specific examples of computer-readable storage media (a non-exhaustive list) include the following: an electrical connection with one or more wirings (electronic devices), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory, or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM, Compact Disc Read-Only Memory). In addition, the computer-readable storage medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0154] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA, Programmable Gate Array), a field programmable gate array (FPGA, Field Programmable Gate Array), etc.

[0155] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for identifying tampering of a urea tank temperature sensor, characterized in that: include: When the vehicle is in a hot engine state and the vehicle is running stably, the urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank; Measuring the actual temperature rise of the urea solution in the urea tank by a urea tank temperature sensor; Calculating a first deviation factor according to the theoretical temperature rise and the actual temperature rise; It is determined whether the urea tank temperature sensor of the vehicle in the hot engine state is tampered with based on the first deviation factor.

2. The method for identifying tampering of a urea tank temperature sensor according to claim 1, characterized in that: Before the urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank when the vehicle is in a hot engine state and the vehicle is running stably, the method for identifying tampering of the urea tank temperature sensor further includes: Acquiring a deviation fluctuation of a rotation speed of an engine, a deviation fluctuation of a torque of the engine, and a deviation fluctuation of a temperature of an antifreeze fluid of the engine; When the stability condition is met, it is determined that the vehicle is running stably, wherein the stability condition includes: the deviation fluctuation of the engine is less than or equal to a first threshold, and the deviation fluctuation of the torque of the engine is less than or equal to a second threshold, and the temperature deviation fluctuation of the antifreeze is less than or equal to a third threshold.

3. The method for identifying tampering of a urea tank temperature sensor according to claim 2, characterized in that: Before the urea solution in the urea tank is heated to obtain a theoretical temperature rise of the urea solution in the urea tank when the vehicle is in a hot engine state and the vehicle is running stably, the method for identifying tampering of the urea tank temperature sensor further includes: When the stable condition is not satisfied, the deviation fluctuation of the engine speed, the deviation fluctuation of the engine torque, and the deviation fluctuation of the temperature of the engine antifreeze fluid are monitored until the stable condition is satisfied.

4. The method for identifying tampering of a urea tank temperature sensor according to any one of claims 1 to 3, characterized in that: The method for identifying tampering of the urea tank temperature sensor also includes: In response to a power-on signal, and when the vehicle is in a cold start state, obtaining engine oil temperature, ambient temperature, antifreeze temperature, and intake air temperature; Calculating a weighted average temperature according to the engine oil temperature, the ambient temperature, the antifreeze temperature, and the intake air temperature; Measuring the actual temperature of the urea solution in the urea tank by the urea tank temperature sensor; calculating a second deviation factor according to the weighted average temperature and the actual temperature; It is determined whether the urea tank temperature sensor of the vehicle in the cold start state is tampered with based on the second deviation factor.

5. The method for identifying tampering of a urea tank temperature sensor according to claim 4, characterized in that: The method for identifying tampering of the urea tank temperature sensor also includes: It is comprehensively determined whether the urea tank temperature sensor of the vehicle is tampered with based on the first deviation factor and the second deviation factor.

6. The method for identifying tampering of a urea tank temperature sensor according to claim 5, characterized in that: The step of comprehensively judging whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor includes: Calculating a weighted average of the first deviation factor and the second deviation factor to obtain a third deviation factor; Comparing the third deviation factor and the fourth threshold value to obtain a comparison result; When the comparison result shows that the third deviation factor is greater than the fourth threshold, it is determined that the urea tank temperature sensor has been tampered with; When the comparison result shows that the third deviation factor is less than or equal to the fourth threshold, it is determined that the urea tank temperature sensor has not been tampered with.

7. The method for identifying tampering of a urea tank temperature sensor according to claim 5 or 6, characterized in that: The step of comprehensively judging whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor includes: When the first judgment condition is met, it is judged that the urea tank temperature sensor has not been tampered with, wherein the first judgment condition is: judging that the urea tank temperature sensor of the vehicle in the hot engine state has not been tampered with, and judging that the urea tank temperature sensor of the vehicle in the cold start state has not been tampered with; When the second judgment condition is met, it is judged that the urea tank temperature sensor is tampered with, wherein the second judgment condition is: judging that the urea tank temperature sensor of the vehicle in the hot engine state is tampered with, and judging that the urea tank temperature sensor of the vehicle in the cold start state is tampered with; The comprehensively judging whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor includes: When the third judgment condition is met, it is comprehensively judged whether the urea tank temperature sensor of the vehicle has been tampered with based on the first deviation factor and the second deviation factor, wherein the third judgment condition is: judging whether the urea tank temperature sensor of the vehicle in the hot engine state or the vehicle in the cold start state has been tampered with.

8. A urea tank temperature sensor tampering identification device, characterized in that: include: A heating module, used for heating the urea solution in the urea tank when the vehicle is in a hot engine state and the vehicle is running stably, so as to obtain a theoretical temperature rise of the urea solution in the urea tank; A measuring module, used for measuring the actual temperature rise of the urea solution in the urea tank through a urea tank temperature sensor; A calculation module, used for calculating a first deviation factor according to the theoretical temperature rise and the actual temperature rise; A judgment module is used to judge whether the urea tank temperature sensor of the vehicle in the hot engine state is tampered with based on the first deviation factor.

9. A vehicle, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the tampering identification method of the urea tank temperature sensor according to any one of claims 1 to 7 when executing the computer program.

10. A computer storage medium, characterized in that: Computer readable instructions are stored on the computer storage medium. When the computer readable instructions are read by one or more processors, the one or more processors execute the urea tank temperature sensor tampering identification method according to any one of claims 1 to 7.

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