Method, electronic device and vehicle for eliminating risk of misjudgment of exhaust back pressure sensor icing

Abstract

The present invention provides a method, electronic device and vehicle for eliminating the risk of misjudgment of icing of an engine exhaust back pressure sensor, including: step A: after the vehicle is started, first condition information is obtained, and whether the exhaust back pressure sensor has the risk of misjudgment of icing is determined based on the first condition information; if so, step B is executed: enabling of functions related to the exhaust back pressure sensor is prohibited until the engine of the vehicle is running, and step C is executed: judging whether the ice has melted based on the second condition information; if so, the risk of misjudgment of icing is eliminated; if not, step D is executed: starting the detection function of the exhaust back pressure sensor to obtain the exhaust back pressure measured value; according to the working condition of the vehicle, the exhaust back pressure model value of the vehicle is obtained; judging whether the exhaust back pressure measured value is abnormal based on the exhaust back pressure measured value and the exhaust back pressure model value; if so, returning to step C; if not, the risk of misjudgment of icing is eliminated. The present invention can solve the problem of false alarm of exhaust back pressure fault caused by icing.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method for eliminating the risk of misjudgment of icing of an engine exhaust back pressure sensor, an electronic device and a vehicle. Background Art

[0002] With the rapid development of the automobile and internal combustion engine industries, energy demand and environmental protection issues have become difficult problems faced by countries around the world today. Therefore, energy conservation and emission reduction have become the two major themes of the development of the internal combustion engine industry. In terms of energy conservation, domestic and foreign automobile manufacturers use various technologies to improve the combustion and power process of the engine. Among them, taking the variable-section turbocharger as an example, with the help of the guide vanes with adjustable vortex cross-section, it can greatly improve the response time and acceleration ability at low speeds, and achieve a boost efficiency that is significantly higher than that of traditional blow-off valve turbochargers in all speed ranges, thereby further improving fuel economy in each speed range.

[0003] Although high-efficiency turbocharging systems represented by variable-geometry turbochargers can effectively improve torque response time and fuel economy, they will cause drastic changes in exhaust back pressure during dynamic supercharging. For example, in Miller cycle engines, due to the significant increase in the large overlap angle operating range, the exhaust back pressure has a greatly enhanced impact on the residual exhaust gas calculation and thus on the accuracy of charging and torque calculation. In order to ensure engine stability and meet increasingly stringent emission regulations, more and more domestic and foreign OEMs have begun to introduce exhaust back pressure sensors on new generation engines, and related detection and control methods for exhaust back pressure sensors have become indispensable.

[0004] In the engineering application of exhaust back pressure sensors, experiments have found that in certain environmental conditions (such as high-cold areas), the exhaust back pressure sensor may have condensation and ice on the exhaust back pressure sensor air intake pipe and ceramic circuit surface. Since the signal performance of the exhaust back pressure sensor when it is frozen is similar to the performance of the exhaust back pressure sensor when it fails, it may cause the EMS control system to misdiagnose the fault. This problem needs to be solved urgently. Summary of the invention

[0005] The object of the present invention is to provide a method, electronic equipment and vehicle for eliminating the risk of misjudgment of icing of an engine exhaust back pressure sensor, so as to solve the problem of false alarm of exhaust back pressure fault caused by icing.

[0006] To achieve the above-mentioned object, the present invention provides a method for eliminating the risk of misjudgment of ice formation in an engine exhaust back pressure sensor, comprising the following steps: Step A: after a vehicle is started, first status information of the vehicle is obtained, and based on the first status information, whether there is a risk of misjudgment of ice formation in the exhaust back pressure sensor of the vehicle engine is determined; if so, step B is executed; Step B: enabling functions related to the exhaust back pressure sensor is prohibited until the engine of the vehicle is running, and step C is executed; Step C: based on the second status information of the vehicle obtained after starting, whether ice on the exhaust back pressure sensor has melted; if so, eliminating the risk of misjudgment of ice formation in the exhaust back pressure sensor If there is a risk of misjudgment of ice, enable the function related to the exhaust back pressure sensor; if not, execute step D: Step D: Start the detection function of the exhaust back pressure sensor, and use the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor as the actual exhaust back pressure measured value; according to the operating condition of the vehicle, obtain the exhaust back pressure model value of the vehicle; according to the actual exhaust back pressure measured value and the exhaust back pressure model value, determine whether the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal; if so, return to step C; if not, eliminate the risk of misjudgment of ice and enable the function related to the exhaust back pressure sensor.

[0007] Optionally, obtaining the first status information of the vehicle includes: obtaining the time from the last shutdown of the vehicle's engine to the current startup of the vehicle, and obtaining the ambient temperature or the engine coolant temperature when the vehicle is started this time; judging whether the exhaust back pressure sensor of the vehicle's engine has a risk of misjudgment of icing based on the first status information, including: if the time is greater than a first preset threshold, and the ambient temperature is less than a second preset threshold or the engine coolant temperature is less than a third preset threshold, then judging that the exhaust back pressure sensor of the vehicle's engine has a risk of misjudgment of icing.

[0008] Optionally, the exhaust back pressure model value of the vehicle is obtained according to the operating condition of the vehicle, including: obtaining the exhaust back pressure model value according to the exhaust flow rate of the vehicle, the opening of the variable section turbine of the vehicle engine, the effective cross-sectional area of ​​the vehicle's turbine, the vehicle's turbine downstream pressure and the vehicle's turbine upstream temperature and a pre-set exhaust back pressure calculation model.

[0009] Optionally, acquiring the exhaust back pressure model value of the vehicle according to the operating condition of the vehicle includes: acquiring the exhaust back pressure model value of the vehicle according to the operating condition of the vehicle and a mapping relationship between a pre-acquired exhaust back pressure model value and the vehicle operating condition.

[0010] Optionally, judging whether the exhaust back pressure value of the vehicle's engine detected by the exhaust back pressure sensor is abnormal based on the exhaust back pressure actual measured value and the exhaust back pressure model value includes: taking each rotation of the engine crankshaft by a preset angle as a cycle; for each cycle, obtaining the average value of the exhaust back pressure actual measured value within the cycle; if the absolute value of the difference between the average value and the exhaust back pressure model value is greater than a fourth preset threshold value within a first preset number of consecutive cycles, then judging that the exhaust back pressure value of the vehicle's engine detected by the exhaust back pressure sensor is abnormal.

[0011] Optionally, judging whether the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal according to the exhaust back pressure actual value and the exhaust back pressure model value specifically includes:

[0012] Each rotation of the engine crankshaft by a preset angle is regarded as one cycle;

[0013] For each cycle, obtaining the maximum value and the minimum value of the exhaust back pressure model value and the maximum value and the minimum value of the exhaust back pressure measured value in the cycle;

[0014] If, within a second consecutive preset number of cycles, the absolute value of the difference between the maximum value of the exhaust back pressure model value and the maximum value of the exhaust back pressure actual measurement value is greater than the fifth preset threshold, and\or the absolute value of the difference between the minimum value of the exhaust back pressure model value and the minimum value of the exhaust back pressure actual measurement value is greater than the sixth preset threshold, then it is determined that the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal.

[0015] Optionally, judging whether ice on the exhaust back pressure sensor has melted is based on second status information acquired after the vehicle is started, including: acquiring exhaust energy of the vehicle based on the vehicle's current exhaust flow rate, exhaust specific heat coefficient and engine exhaust temperature of the vehicle; if the exhaust energy is greater than a seventh preset threshold, determining whether ice on the exhaust back pressure sensor has melted.

[0016] Optionally, the exhaust energy of the vehicle is continuously obtained according to the current exhaust flow rate, exhaust specific heat coefficient and engine exhaust temperature of the vehicle, specifically including:

[0017] The exhaust energy of the vehicle is continuously obtained according to the following formula:

[0018]

[0019] Where:

[0020] E exh is the exhaust energy of the vehicle;

[0021] is the current exhaust flow rate of the vehicle;

[0022] c p,exh is the exhaust gas specific heat capacity coefficient;

[0023] T exh is the engine exhaust temperature of the vehicle;

[0024] t is the duration of the vehicle since this start, that is, the time from the start of the vehicle to the calculation of the exhaust energy of the vehicle using this formula.

[0025] The present invention also provides an electronic device, including a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, any of the above-mentioned methods for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing is implemented.

[0026] The present invention also provides a vehicle, comprising the electronic device.

[0027] The method, electronic device and vehicle provided by the present invention for eliminating the risk of misjudgment of icing of an engine exhaust back pressure sensor have the following beneficial effects:

[0028] The method for eliminating the risk of misjudgment of the engine exhaust back pressure sensor due to icing provided by the present invention comprises the following steps: step A: after the vehicle is started, first status information of the vehicle is obtained, and based on the first status information, whether the exhaust back pressure sensor of the vehicle engine has the risk of misjudgment of icing is determined; if so, step B is executed; step B: enabling of functions related to the exhaust back pressure sensor is prohibited until the engine of the vehicle is running, and step C is executed; step C: based on the second status information of the vehicle obtained after starting, whether the ice on the exhaust back pressure sensor has melted; if so, the risk of misjudgment of the engine due to icing is eliminated. If there is any risk, enable the function related to the exhaust back pressure sensor; if not, execute step D: Step D: Start the detection function of the exhaust back pressure sensor, and use the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor as the actual exhaust back pressure measured value; according to the working condition of the vehicle, obtain the exhaust back pressure model value of the vehicle; according to the exhaust back pressure measured value and the exhaust back pressure model value, determine whether the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal; if so, return to step C; if not, eliminate the risk of misjudgment of icing and enable the function related to the exhaust back pressure sensor. Therefore, the present invention takes into account the possibility of condensation and ice on the exhaust back pressure sensor air intake pipe and ceramic circuit surface under certain environmental conditions (such as high-cold areas) by acquiring the first condition information and using it as a basis, and first prohibits the exhaust back pressure sensor from working in this situation, first determines whether the ice has melted, and then enables the exhaust back pressure sensor, and uses the exhaust back pressure measured value and exhaust back pressure model value to determine whether the detected engine exhaust back pressure value of the vehicle is abnormal when the ice has not melted. After confirming that there is no abnormality, the risk of misjudgment of ice can also be quickly eliminated. In this way, the false alarm of the exhaust back pressure sensor caused by ice is avoided. The method for eliminating the risk of misjudgment of ice on the engine exhaust back pressure sensor provided by the present invention can quickly identify the situation of condensation and ice on the sensor air intake pipe and ceramic circuit surface. Since the signal performance of the exhaust back pressure sensor when it is frozen is similar to the performance of the exhaust back pressure sensor when it fails, the above method can effectively prevent the occurrence of misdiagnosis of control system faults.

[0029] Since the electronic device provided by the present invention is used to implement any of the above-mentioned methods for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing, the electronic device provided by the present invention can avoid the occurrence of the problem of false alarm of the exhaust back pressure sensor due to icing.

[0030] Since the vehicle provided by the present invention includes the electronic device, the vehicle provided by the present invention can avoid the occurrence of the problem of false alarm of the exhaust back pressure sensor caused by icing. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a vehicle engine system with an exhaust back pressure sensor in the prior art;

[0032] Figure 2 A schematic flow chart of a method for eliminating the risk of misjudgment of icing of an engine exhaust back pressure sensor provided by an embodiment of the present invention;

[0033] Figure 3 A curve diagram showing the relationship between the measured exhaust back pressure and the engine crankshaft angle provided in one embodiment of the present invention;

[0034] Figure 4 A curve diagram showing the relationship between the exhaust back pressure model value and the engine crankshaft angle provided in one embodiment of the present invention;

[0035] Figure 5 A schematic diagram of a block structure of an electronic device provided by an embodiment of the present invention;

[0036] The accompanying drawings are numbered as follows:

[0037] 10-air filter; 20-air compressor; 30-intercooler; 40-throttle valve; 50-engine; 60-exhaust back pressure sensor; 70-turbine;

[0038] 1- The curve of the measured value of exhaust back pressure changing with the engine crankshaft angle;

[0039] 2- Average value line of the measured exhaust back pressure;

[0040] 3-Curve of variation of exhaust back pressure model value with engine crankshaft angle;

[0041] 101 - processor; 102 - communication interface; 103 - memory; 104 - communication bus. DETAILED DESCRIPTION

[0042] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing needs to be shown, and sometimes the proportion of each drawing is adopted.

[0043] It should be understood that when an element or layer is referred to as "on...", "connected to" other elements or layers, it can be directly on other elements or layers, connected to other elements or layers, or can include intermediate elements or layers. On the contrary, when an element is referred to as "directly on...", "directly connected to" other elements or layers, intermediate elements or layers are not included. Although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below can be expressed as a second element, component, region, layer or part. Spatial relationship terms such as "under...", "below", "below", "above...", "above", "above", etc., can be used here for the convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, the spatial relationship terms are intended to include the various orientations of the devices in use and operation. For example, if the device in the accompanying drawings is turned over, then, the elements or features described as "under...", "below", "below" will be oriented to be "on" other elements or features. The device can be oriented in addition (rotated 90 degrees or other orientations) and the spatial descriptors used here are interpreted accordingly. The purpose of the terms used here is only to describe specific embodiments and is not intended to be a limitation of the present invention. When used here, the singular forms of "one", "one" and "said / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the term "include" is used to determine the inclusion of features, steps, operations, elements and / or parts, but does not exclude the inclusion or addition of one or more other features, steps, operations, elements, parts and / or groups. When used here, the term "and / or" includes any and all combinations of the relevant listed items.

[0044] For ease of understanding, the principle of vehicle engine exhaust back pressure detection is first explained.

[0045] Please refer to Figure 1 , Figure 1 FIG. 1 is a schematic diagram of a vehicle engine system with an exhaust back pressure sensor in the prior art. Figure 1 As shown, after the vehicle engine is running, air will enter the engine 50 through the air filter 10, the air compressor 20, the intercooler 30, and the throttle valve 40 in sequence. In the engine 50, the air and the combustion medium such as gasoline are burned to form exhaust gas and discharged from the engine 50. After being discharged from the engine 50, the exhaust back pressure of the exhaust gas will be detected by the exhaust back pressure sensor 60, and then the exhaust gas is discharged through the turbine 70.

[0046] In the engineering application of exhaust back pressure sensors, it has been experimentally found that under certain environmental conditions (such as high-cold areas), the exhaust back pressure sensor may have condensation and ice on the exhaust back pressure sensor air intake pipeline and ceramic circuit surface. Since the signal performance of the exhaust back pressure sensor when it is frozen is similar to the performance of the exhaust back pressure sensor when it fails, it may cause the EMS control system to diagnose the fault incorrectly, that is, misjudgment of the engine exhaust back pressure sensor being frozen. Therefore, the purpose of the present invention is to provide a method, electronic equipment and vehicle to eliminate the risk of misjudgment of the engine exhaust back pressure sensor being frozen, so as to avoid the occurrence of false alarms of exhaust back pressure due to ice.

[0047] To achieve the above object, the present invention provides a method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing, please refer to Figure 2 , which is a flow chart of a method for eliminating the risk of misjudgment of icing of an engine exhaust back pressure sensor provided by an embodiment of the present invention, such as Figure 2 As shown, the method for eliminating the risk of misjudgment of icing of the engine exhaust back pressure sensor provided by the present invention comprises the following steps:

[0048] Step A: after the vehicle is started, first status information of the vehicle is obtained, and based on the first status information, whether an exhaust back pressure sensor of the vehicle engine has a risk of misjudgment of icing is determined;

[0049] If yes, proceed to step B;

[0050] Step B: prohibiting activation of functions related to the exhaust back pressure sensor until the engine of the vehicle is running, and then executing step C;

[0051] Step C: judging whether ice on the exhaust back pressure sensor has melted according to the acquired second status information after the vehicle is started;

[0052] If so, the risk of misjudgment of icing is eliminated and the function related to the exhaust back pressure sensor is enabled;

[0053] If not, proceed to step D:

[0054] Step D: starting the detection function of the exhaust back pressure sensor, and using the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor as the exhaust back pressure actual measurement value;

[0055] Acquiring an exhaust back pressure model value of the vehicle according to the operating condition of the vehicle;

[0056] determining whether the exhaust back pressure value of the engine of the vehicle detected by the exhaust back pressure sensor is abnormal according to the exhaust back pressure actual value and the exhaust back pressure model value;

[0057] If yes, return to step C;

[0058] If not, the risk of false icing judgment is eliminated and the functions related to the exhaust back pressure sensor are enabled.

[0059] It should be noted that the functions related to the exhaust back pressure sensor include but are not limited to the detection function of the exhaust back pressure sensor itself and the functions related to the control logic. The present invention obtains the first condition information and takes it as a basis, taking into account the possibility that the exhaust back pressure sensor may have condensation and ice on the exhaust back pressure sensor air intake pipeline and the ceramic circuit surface under certain environmental conditions (such as high-cold areas), and in this case, the exhaust back pressure sensor is first prohibited from working, and the exhaust back pressure sensor is first judged whether the ice has melted before starting, and the exhaust back pressure sensor is judged whether the detected engine exhaust back pressure value of the vehicle is abnormal by using the exhaust back pressure measured value and the exhaust back pressure model value when the ice has not melted, and the risk of misjudgment of ice is also quickly eliminated after confirming that there is no abnormality. In this way, the false alarm of the exhaust back pressure sensor caused by ice is avoided. Since the signal performance of the exhaust back pressure sensor when it is frozen is similar to the performance of the exhaust back pressure sensor when it fails, the above method can effectively prevent the occurrence of misdiagnosis of control system faults.

[0060] For ease of understanding, the role of step D is further explained. According to the method steps of the present invention, if it can be confirmed that the ice has melted, the risk of misjudgment of ice can be directly eliminated. However, it takes some time for the ice to melt. Considering that the ice may not affect the exhaust back pressure sensor or the exhaust back pressure sensor may have returned to normal during the melting of the ice, when it is determined that the ice has not melted, the exhaust back pressure measured value and the exhaust back pressure model value are also used according to step D to determine whether the detected engine exhaust back pressure value of the vehicle is abnormal. After confirming that there is no abnormality, it means that the exhaust back pressure sensor is no longer affected by ice, and the risk of misjudgment of ice can also be quickly eliminated.

[0061] It should be noted that enabling the functions related to the exhaust back pressure sensor includes but is not limited to continuing to perform diagnostic testing on the exhaust back pressure sensor, because it is possible that the exhaust back pressure sensor does fail due to factors other than icing. The purpose of the present invention is mainly to quickly eliminate the risk of misjudgment of icing.

[0062] In an exemplary embodiment, the obtaining of the first status information of the vehicle includes: obtaining the time timing from the last shutdown of the vehicle's engine to the current startup of the vehicle, and obtaining the ambient temperature or the engine coolant temperature when the vehicle is started this time; judging whether the exhaust back pressure sensor of the vehicle's engine has a risk of misjudgment of icing based on the first status information, including: if the time timing is greater than a first preset threshold, and the ambient temperature is less than a second preset threshold or the engine coolant temperature is less than a third preset threshold, then judging that the exhaust back pressure sensor of the vehicle's engine has a risk of misjudgment of icing.

[0063] This setting is because the exhaust back pressure sensor is generally likely to freeze only after the vehicle is turned off and stopped for a certain period of time in a low temperature environment. The possibility of the exhaust back pressure sensor freezing is small when the vehicle is turned off for a short time, and the possibility of the exhaust back pressure sensor freezing is also small when the ambient temperature is high.

[0064] In an exemplary embodiment, when the time between the last shutdown and the current startup of the vehicle's engine is 3-4 hours, and the ambient temperature or the engine coolant temperature when the vehicle is started this time is about minus 10 degrees Celsius, experiments have shown that the exhaust back pressure sensor may be at risk of icing, but the invention is not limited to this.

[0065] Furthermore, the exhaust back pressure model value of the vehicle is obtained according to the working condition of the vehicle, including: obtaining the exhaust back pressure model value according to the exhaust flow rate of the vehicle, the opening of the variable section turbine of the vehicle engine, the effective cross-sectional area of ​​the turbine of the vehicle, the downstream pressure of the turbine of the vehicle, the upstream temperature of the turbine of the vehicle, and a preset exhaust back pressure calculation model. According to a large number of experiments by the inventor, the exhaust flow rate of the vehicle, the opening of the variable section turbine of the vehicle engine, the effective cross-sectional area of ​​the turbine of the vehicle, the downstream pressure of the turbine of the vehicle, and the upstream temperature of the turbine of the vehicle are obtained, and the exhaust back pressure model value can be calculated based on their physical correlation with the exhaust back pressure. The exhaust back pressure model value obtained in this way will be a dynamic average, which can be used in practice to determine whether the exhaust back pressure sensor is abnormal. The judgment method at this time can be: taking each rotation of the engine crankshaft by a preset angle as a cycle; for each cycle, obtaining the average value of the exhaust back pressure measured value within the cycle; if the absolute value of the difference between the average value and the exhaust back pressure model value is greater than a fourth preset threshold value within a first preset number of consecutive cycles, it is determined that the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal.

[0066] In this judgment mode, in an exemplary embodiment, the exhaust back pressure model value may be calculated using the following formula:

[0067]

[0068] in,

[0069] is the exhaust flow rate;

[0070] POS vgt is the opening of the variable turbine geometry;

[0071] A vgt is the effective cross-sectional area of ​​the turbine;

[0072] p 1 is the exhaust back pressure model value;

[0073] p 2 is the pressure downstream of the turbine;

[0074] T 1 is the turbine upstream temperature;

[0075] ψ trb is the flow coefficient based on the pressure ratio.

[0076] In addition, the above formula is used to determine the exhaust back pressure model value. In order to determine the upper and lower limits of the exhaust back pressure model value of the engine under the current working conditions, the upper limit of the exhaust flow rate obtained can be brought into the formula. and lower limit (can be determined by the engine's throttle parameters and intake manifold parameters), the maximum opening of the engine's variable-section turbine and minimum value The maximum downstream pressure of the variable turbine geometry is and minimum value The maximum upstream temperature of the variable turbine geometry is and minimum value And the upper deviation of the exhaust flow rate of the engine relative to the actual exhaust flow rate and lower deviation The upper limit of the exhaust flow rate is The maximum opening of the variable turbine geometry of the engine The maximum downstream pressure of the variable turbine geometry is The maximum upstream temperature of the variable turbine geometry is And the upper deviation of the exhaust flow rate of the engine relative to the actual exhaust flow rate After substituting the above formula, the upper limit of the exhaust back pressure model value of the engine under the current working condition can be obtained: Set the lower limit of the exhaust flow model value The minimum opening of the variable turbine geometry of the engine The minimum downstream pressure of the variable turbine geometry The minimum upstream temperature of the variable turbine geometry and the lower deviation of the exhaust flow rate of the engine relative to the actual exhaust flow rate After substituting the above formula, the lower limit of the exhaust back pressure model value of the engine under the current working condition can be obtained: The upper limit of the exhaust back pressure model value of the engine under the current operating conditions and lower limit The upper limit of the exhaust back pressure model value can be selected as needed. With lower limit Any value between is used to compare with the average value, and it can also be judged whether the average value is within the upper limit of the exhaust back pressure model value. With lower limit The value range between is used to determine whether the exhaust back pressure actual measurement value is abnormal.

[0077] Please refer to Figure 3 , which is a curve diagram showing the relationship between the measured exhaust back pressure and the engine crankshaft angle provided by an embodiment of the present invention, such as Figure 3 As shown, in an exemplary embodiment, the engine crankshaft can rotate 180 degrees as a cycle. The reason for this setting is that when the engine crankshaft rotates 180 degrees, it is generally considered that the engine has completed a combustion step. For example, for a four-cylinder engine, when the engine crankshaft rotates 180 degrees, the four-cylinder engine has completed the steps of inhaling air, compressing air, burning gas and exhausting exhaust gas in sequence. During this complete process, the exhaust back pressure can be effectively detected. Please continue to refer to Figure 3 ,like Figure 3 As shown, in an exemplary embodiment, the exhaust back pressure measured value detected by the exhaust back pressure sensor can be obtained once every 0.5 seconds and plotted as a curve 1 of the exhaust back pressure measured value versus the engine crankshaft angle, and all the exhaust back pressure measured values ​​obtained within a cycle are averaged to plot an average value line 2 of the exhaust back pressure measured value, the average value is also a dynamic average value, and the average value is compared with the exhaust back pressure model value. If the absolute value of the difference between the average value and the exhaust back pressure model value is greater than the fourth preset threshold, it is determined that the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal. It should be understood that other rotation angles can also be set as the cycle, such as integer multiples of 180 degrees, but it is not limited to this.

[0078] Alternatively, the exhaust back pressure model value may be obtained by: obtaining the exhaust back pressure model value of the vehicle according to the working condition of the vehicle and the mapping relationship between the pre-acquired exhaust back pressure model value and the vehicle working condition. That is, obtaining the exhaust back pressure experimental record value obtained in the previous running experiment of the same model of the vehicle, the running experiment is carried out at the experimental temperature, and the exhaust back pressure experimental record value under the same working condition as the exhaust back pressure measured value is used as the exhaust back pressure model value. Please refer to Figure 4 , which is a graph showing the relationship between the exhaust back pressure model value and the engine crankshaft angle provided in one embodiment of the present invention. It should be understood that the operating experiments include but are not limited to experiments conducted in the laboratory and on-road measurements, and the experimental temperature should be a temperature that prevents the exhaust back pressure sensor from freezing, such as normal summer room temperature. In this way, a database of the exhaust back pressure model values ​​can be formed, and different exhaust back pressure model values ​​can correspond to different operating conditions. The exhaust back pressure model value under the same operating condition as the exhaust back pressure measured value is selected, and a curve 3 of the change of the exhaust back pressure model value with the engine crankshaft angle can be plotted. This curve can represent the theoretical curve of the change of the exhaust back pressure value with the engine crankshaft angle when the exhaust back pressure sensor is not frozen. From Figure 4 It can be obtained that the curve 3 of the variation of the exhaust back pressure model value with the engine crankshaft angle has a maximum value and a minimum value in one cycle of the engine crankshaft rotation, namely, the peak and the trough in the curve 3. Similarly, a curve of the variation of the exhaust back pressure measured value with the engine crankshaft angle can be drawn. When the exhaust back pressure sensor is not in an iced state, the curve of the variation of the exhaust back pressure measured value with the engine crankshaft angle should be close to the curve 3 of the variation of the exhaust back pressure model value with the engine crankshaft angle; and when the exhaust back pressure sensor is in an iced state, the peak / trough of the curve of the variation of the exhaust back pressure measured value with the engine crankshaft angle will also be significantly weakened due to the obstruction of the propagation of the pressure wave.

[0079] Further, judging whether the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal based on the exhaust back pressure actual measurement value and the exhaust back pressure model value specifically includes: taking each rotation of the engine crankshaft by a preset angle as a cycle; for each cycle, obtaining the maximum and minimum values ​​of the exhaust back pressure model value and the maximum and minimum values ​​of the exhaust back pressure actual measurement value in the cycle; if the absolute value of the difference between the maximum value of the exhaust back pressure model value and the maximum value of the exhaust back pressure actual measurement value is greater than the fifth preset threshold value, and\or the absolute value of the difference between the minimum value of the exhaust back pressure model value and the minimum value of the exhaust back pressure actual measurement value is greater than the sixth preset threshold value in a second consecutive preset number of cycles, then judging that the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal. It should be noted that in this scenario, either each rotation of the engine crankshaft by 180 degrees can be taken as a cycle, or the angle of rotation of the engine crankshaft during the process of opening and closing the engine exhaust valve can be taken as a cycle.

[0080] Furthermore, judging whether the ice on the exhaust back pressure sensor has melted is based on the second status information obtained after the vehicle is started, including: obtaining the exhaust energy of the vehicle based on the vehicle's current exhaust flow rate, exhaust specific heat coefficient and engine exhaust temperature of the vehicle; if the exhaust energy is greater than a seventh preset threshold, determining that the ice on the exhaust back pressure sensor has melted.

[0081] Specifically, the exhaust energy of the vehicle is continuously obtained according to the current exhaust flow rate, exhaust specific heat capacity coefficient and engine exhaust temperature of the vehicle, specifically including:

[0082] The exhaust energy of the vehicle is continuously obtained according to the following formula:

[0083]

[0084] Where:

[0085] E exh is the exhaust energy of the vehicle;

[0086] is the current exhaust flow rate of the vehicle;

[0087] c p,exh is the exhaust gas specific heat capacity coefficient;

[0088] T exh is the engine exhaust temperature of the vehicle;

[0089] t is the duration of the vehicle starting up.

[0090] The exhaust energy of the vehicle will continue to accumulate and release heat after the engine is started. When the exhaust energy of the vehicle accumulates to a certain extent, the heat generated can melt the ice on the exhaust back pressure sensor. It should be understood that other information can also be used as the second condition information, such as the engine being at a preset temperature for a preset period of time and other scenario information, which will not be repeated here.

[0091] To achieve the above object, the present invention also provides an electronic device, please refer to Figure 5 , which schematically shows a block diagram of an electronic device provided by an embodiment of the present invention. Figure 5 As shown, the electronic device includes a processor 101 and a memory 103, and a computer program is stored in the memory 103. When the computer program is executed by the processor 101, the method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing described above is implemented. Since the electronic device provided by the present invention and the method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing described above belong to the same inventive concept, the electronic device provided by the present invention has all the advantages of the method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing described above, so the beneficial effects of the electronic device provided by the present invention will not be described one by one here.

[0092] like Figure 5 As shown, the electronic device also includes a communication interface 102 and a communication bus 104, wherein the processor 101, the communication interface 102, and the memory 103 communicate with each other through the communication bus 104. The communication bus 104 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus 104 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus. The communication interface 102 is used for communication between the above-mentioned electronic device and other devices.

[0093] The processor 101 referred to in the present invention may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor 101 is the control center of the electronic device, and various interfaces and lines are used to connect various parts of the entire electronic device.

[0094] The memory 103 may be used to store the computer program. The processor 101 implements various functions of the electronic device by running or executing the computer program stored in the memory 103 and calling the data stored in the memory 103 .

[0095] The memory 103 may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0096] To achieve the above object, the present invention further provides a vehicle, the vehicle comprising the electronic device described above. Since the vehicle provided by the present invention and the electronic device described above belong to the same inventive concept, the vehicle provided by the present invention has all the advantages of the electronic device described above, so the beneficial effects of the vehicle provided by the present invention will not be described one by one here.

[0097] To achieve the above-mentioned purpose, the present invention further provides a readable storage medium, wherein the readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing described above is implemented. Since the readable storage medium provided by the present invention and the method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing described above belong to the same inventive concept, the readable storage medium provided by the present invention has all the advantages of the method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing described above, and therefore the beneficial effects of the readable storage medium provided by the present invention will not be described one by one here.

[0098] The readable storage medium of the embodiment of the present invention can adopt any combination of one or more computer-readable media. The readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer hard disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this article, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, a device or a device or used in combination with it.

[0099] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program codes. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, device, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0100] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0101] It should also be noted that, although the present invention has been disclosed as a preferred embodiment as above, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

[0102] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are merely used to distinguish between the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0103] It should also be recognized that the terms described herein are used only to describe specific embodiments and are not intended to limit the scope of the invention. It should be noted that the singular forms "a" and "an" used herein and in the appended claims include plural references unless the context clearly indicates otherwise. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood to have the definition of a logical "or", rather than a logical "exclusive or", unless the context clearly indicates otherwise. In addition, the implementation of embodiments of the present invention may include performing selected tasks manually, automatically, or in combination.

Claims

1. A method to eliminate the risk of misjudgment of engine exhaust back pressure sensor icing, It is characterized in that The following steps are involved: Step A: after the vehicle is started, first status information of the vehicle is obtained, and according to the first status information, whether an exhaust back pressure sensor of the vehicle engine has a risk of misjudgment of icing is determined; If yes, proceed to step B; Step B: prohibiting activation of functions related to the exhaust back pressure sensor until the engine of the vehicle is running, and then executing step C; Step C: judging whether ice on the exhaust back pressure sensor has melted according to the acquired second status information after the vehicle is started; If so, the risk of misjudgment of icing is eliminated and the function related to the exhaust back pressure sensor is enabled; If not, proceed to step D: Step D: starting the detection function of the exhaust back pressure sensor, and using the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor as the exhaust back pressure actual measurement value; Acquiring an exhaust back pressure model value of the vehicle according to the operating condition of the vehicle; determining whether the exhaust back pressure value of the engine of the vehicle detected by the exhaust back pressure sensor is abnormal according to the exhaust back pressure actual value and the exhaust back pressure model value; If yes, return to step C; If not, the risk of misjudgment of icing is eliminated and the function related to the exhaust back pressure sensor is enabled; The obtaining of the first status information of the vehicle includes: Obtaining the time from the last shutdown of the engine of the vehicle to the current startup of the vehicle, and obtaining the ambient temperature or engine coolant temperature when the vehicle is started this time; The determining, based on the first condition information, whether there is a risk of misjudgment of icing of the exhaust back pressure sensor of the vehicle engine includes: If the time is greater than a first preset threshold, and the ambient temperature is less than a second preset threshold or the engine coolant temperature is less than a third preset threshold, it is determined that the exhaust back pressure sensor of the vehicle engine has a risk of misjudgment of icing; The determining, based on the acquired second status information after the vehicle is started, whether ice on the exhaust back pressure sensor has melted comprises: Acquiring exhaust energy of the vehicle according to the current exhaust flow rate, exhaust specific heat coefficient and engine exhaust temperature of the vehicle; If the exhaust gas energy is greater than a seventh preset threshold, it is determined that ice on the exhaust back pressure sensor has melted.

2. The method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing as claimed in claim 1, It is characterized in that The step of obtaining an exhaust back pressure model value of the vehicle according to the working condition of the vehicle includes: The exhaust back pressure model value is obtained based on the exhaust flow of the vehicle, the opening of the variable-section turbine of the vehicle engine, the effective cross-sectional area of ​​the vehicle's turbine, the downstream pressure of the vehicle's turbine, the upstream temperature of the vehicle's turbine, and a pre-set exhaust back pressure calculation model.

3. The method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing as claimed in claim 1, It is characterized in that The step of obtaining an exhaust back pressure model value of the vehicle according to the working condition of the vehicle includes: The exhaust back pressure model value of the vehicle is obtained according to the operating condition of the vehicle and a mapping relationship between the pre-acquired exhaust back pressure model value and the vehicle operating condition.

4. The method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing as claimed in claim 2, It is characterized in that The determining, based on the exhaust back pressure actual value and the exhaust back pressure model value, whether the exhaust back pressure value of the engine of the vehicle detected by the exhaust back pressure sensor is abnormal includes: One cycle is defined as each rotation of the engine crankshaft by a preset angle; For each cycle, obtaining an average value of the exhaust back pressure measured in the cycle; If the absolute value of the difference between the average value and the exhaust back pressure model value is greater than a fourth preset threshold value within a first preset number of consecutive cycles, it is determined that the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal.

5. The method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing as claimed in claim 3, It is characterized in that The determining, based on the exhaust back pressure actual value and the exhaust back pressure model value, whether the exhaust back pressure value of the engine of the vehicle detected by the exhaust back pressure sensor is abnormal specifically includes: One cycle is defined as each rotation of the engine crankshaft by a preset angle; For each cycle, obtaining the maximum value and the minimum value of the exhaust back pressure model value and the maximum value and the minimum value of the exhaust back pressure measured value in the cycle; If, within a second consecutive preset number of cycles, the absolute value of the difference between the maximum value of the exhaust back pressure model value and the maximum value of the exhaust back pressure actual measurement value is greater than the fifth preset threshold, and\or the absolute value of the difference between the minimum value of the exhaust back pressure model value and the minimum value of the exhaust back pressure actual measurement value is greater than the sixth preset threshold, then it is determined that the engine exhaust back pressure value of the vehicle detected by the exhaust back pressure sensor is abnormal.

6. The method for eliminating the risk of misjudgment of engine exhaust back pressure sensor icing as claimed in claim 1, It is characterized in that The step of obtaining the exhaust energy of the vehicle according to the current exhaust flow rate, exhaust specific heat capacity coefficient and engine exhaust temperature of the vehicle comprises: The exhaust energy of the vehicle is obtained according to the following formula: Where: E exh is the exhaust energy of the vehicle; is the current exhaust flow rate of the vehicle; c p,exh is the exhaust gas specific heat capacity coefficient; T exh is the engine exhaust temperature of the vehicle; t is the duration of the vehicle starting up.

7. An electronic device, It is characterized in that The method comprises a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the method for eliminating the risk of misjudgment of icing of an engine exhaust back pressure sensor as described in any one of claims 1 to 6 is implemented.

8. A vehicle, It is characterized in that An electronic device comprising the electronic device described in claim 7.

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