A false alarm solving method for a vehicle urea system

Abstract

The present application belongs to the technical field of vehicle inspection, and particularly relates to a vehicle urea system false alarm solving method, system, terminal and storage medium, comprising: after the vehicle is powered on, a signal acquisition assembly installed in the urea tank of the vehicle acquires the temperature signal of urea solution in the urea tank, the liquid level signal of urea solution, the concentration signal of urea solution and the pressure value of the urea system; the present application acquires multiple signals such as the temperature, liquid level, concentration and system pressure of urea solution in the urea tank, and compares them with preset threshold values, so that the present application can more accurately determine whether the urea system has false alarms. Especially when the liquid level and concentration signals are abnormal, by further comparing the urea system pressure value and the nitrogen oxide emission value, the present application effectively distinguishes false alarms from actual faults, and improves the reliability of the system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle inspection, and particularly relates to a urea system false alarm solving method and system for vehicles, a terminal and a storage medium. BACKGROUND

[0002] In the current vehicle emission control system, the urea system plays a crucial role. Its core function is to significantly reduce nitrogen oxide emissions by purifying exhaust gas, while optimizing engine performance and fuel consumption, thereby achieving the purpose of reducing costs and reducing environmental pollution. However, the performance of the urea system is extremely susceptible to external environmental influences, especially temperature changes.

[0003] Under high temperature conditions, urea may deteriorate, resulting in a significant reduction in its purification effect. In low temperature environments, urea may freeze, which not only blocks the system pipeline, but also may cause damage to the system. More complex is that temperature changes may also cause bubbles in the urea solution. These bubbles, although small, can interfere with signal acquisition once they adhere to the surface of the urea liquid level sensor or concentration sensor, causing the system to be unable to accurately identify the liquid level and concentration of the urea solution.

[0004] Currently, the industry mainly uses ultrasonic technology to detect the liquid level and concentration of urea solution. This technology has the advantages of simple structure, convenient reading and easy installation and maintenance. However, the ultrasonic sensor is extremely susceptible to bubbles and impurities in the solution during detection. Especially in the case of temperature fluctuations or significant liquid disturbance in the urea solution, the generation of bubbles is particularly frequent. Once these bubbles adhere to the emitting surface or reflecting surface of the ultrasonic sensor, the system detection accuracy will decrease, and even false alarms will be triggered.

[0005] The generation of false alarms not only affects the normal operation of the vehicle, but also may cause serious problems such as torque limitation and inability to start. In order to solve this problem, the industry has been exploring more accurate and reliable urea system detection methods. However, existing methods mostly only focus on the collection and analysis of a single signal, while ignoring the comprehensive influence of multiple environmental factors on system performance. SUMMARY

[0006] In view of the above shortcomings of the prior art, the present application provides a urea system false alarm solving method and system for vehicles, a terminal and a storage medium to solve the above technical problems.

[0007] In a first aspect, the present application provides a urea system false alarm solving method for vehicles, comprising:

[0008] After the vehicle is powered on, the temperature signal of the urea solution in the urea tank, the liquid level signal of the urea solution, the concentration signal of the urea solution and the pressure value of the urea system are collected by the signal collection assembly installed in the urea tank of the vehicle; and the nitrogen oxide emission value is collected by the nitrogen oxide sensor installed at the exhaust emission of the vehicle; and the collected temperature signal, liquid level signal, concentration signal, pressure value of the urea system and nitrogen oxide emission value are transmitted to the aftertreatment controller of the vehicle;

[0009] The aftertreatment controller compares the received temperature signal, liquid level signal and concentration signal with the corresponding preset signal threshold value respectively to determine whether the received collected signal is abnormal; and when the liquid level signal of the urea solution is abnormal, the aftertreatment controller determines whether the urea system has a urea liquid level false alarm by comparing the pressure value of the urea system with the preset pressure value, and when the concentration signal is abnormal, the aftertreatment controller determines whether the urea system has a urea concentration false alarm by comparing the nitrogen oxide emission value with the preset nitrogen oxide emission value.

[0010] When it is determined that the urea system has a urea liquid level false alarm, the aftertreatment controller controls the start of the degassing device to remove the bubbles existing on the surface of the urea liquid level sensor in the signal collection assembly to correct the urea liquid level signal; and when it is determined that the urea system has a urea concentration false alarm, the aftertreatment controller controls the start of the urea pump and the three-way control valve installed at the urea pump to perform self-circulation of the target urea solution under the condition of ensuring the normal operation of the urea system, remove the bubbles existing on the surface of the urea concentration sensor in the signal collection assembly by self-circulation, and correct the urea concentration signal.

[0011] Further improvement of the technical solution is that the process of analyzing the received temperature signal, liquid level signal, concentration signal, pressure value of the urea system and nitrogen oxide emission value by the aftertreatment controller and solving the false alarm is as follows:

[0012] L1, the aftertreatment controller determines whether the received temperature signal is less than or equal to the preset temperature threshold value; if yes, go to S1; if no, go to L3;

[0013] S1, start the vehicle at low temperature, control the start of the heating module to thaw the urea system, and go to L2;

[0014] L2, determine whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value; if no, go to S1; if yes, go to S3;

[0015] L3, determine whether the liquid level signal of the urea solution is greater than or equal to the preset liquid level data; if yes, go to S3; if no, go to S2;

[0016] S2, control the start of the urea pump to build pressure, and go to L4;

[0017] S3: The vehicle operates normally, the urea injection system is controlled to start working, and the process goes to L5;

[0018] L4. Determine whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value; if so, go to S4; if not, go to S8;

[0019] S4. The vehicle is started normally, the urea system starts to work, and it is determined that there is a urea liquid level false alarm in the urea system, and the process goes to S5;

[0020] S5, control the start of the degassing device to remove bubbles on the surface of the urea liquid level sensor in the signal acquisition component, and correct the urea liquid level signal; and go to L3;

[0021] L5. Determine whether the concentration signal of the urea solution is greater than or equal to a first preset concentration threshold and less than or equal to a second preset concentration threshold, and whether the first preset concentration threshold is less than the second preset concentration threshold; if not, go to L6; if so, go to S7;

[0022] L6. Determine whether the received nitrogen oxide emission value is greater than or equal to the preset nitrogen oxide emission value; if not, go to S6; if so, go to S8;

[0023] S6. Control and start the urea pump and the three-way control valve. While ensuring the normal operation of the urea system, the target urea solution is self-circulated. The self-circulation removes bubbles on the surface of the urea concentration sensor in the signal acquisition component and corrects the urea concentration signal. Then go to L5.

[0024] S7. Determine that the urea system and the vehicle are operating normally;

[0025] S8. Determine that there is a fault in the urea system and stop the vehicle for inspection.

[0026] The technical solution is further improved in that step S2 is specifically as follows: controlling the urea pump to start and build pressure three times at intervals, starting the urea pump once every first preset time, and running the urea pump for a second preset time each time to build pressure, and after each pressure buildup, judging whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value, and if it is judged that the pressure value of the urea system is greater than or equal to the preset urea system pressure value at any time, going to step S4; if the pressure value of the urea system is less than the preset urea system pressure value after the three pressure buildups, going to S8, and issuing a urea shortage signal.

[0027] The further improvement of the technical solution is that step L4 is specifically: judging whether the pressure value of the urea system after each pressure building is greater than or equal to a preset urea system pressure value, and judging the pressure building capacity of the urea pump; if the urea pump can build pressure, turning to S4 to determine that the urea system has urea liquid level false reporting; if the urea pump cannot build pressure, turning to S8 to determine that the urea system lacks urea and urea lack signal, or determine that the urea system has a fault.

[0028] The further improvement of the technical solution is that step S5 is specifically: controlling the vehicle to enter a mechanical degassing mode, controlling the degassing device to start intermittently three times to remove bubbles existing on the surface of the urea liquid level sensor in the signal acquisition assembly, starting the degassing device once every third preset time, removing bubbles for a fourth preset time each time the degassing device is started, correcting the urea liquid level signal, and judging whether the liquid level signal of the urea solution is greater than or equal to preset liquid level data after each time the degassing device is started, and turning to step S3 when the liquid level signal of the urea solution is greater than or equal to the preset liquid level data after any degassing.

[0029] In a second aspect, the present application provides a urea system false reporting solution for vehicles, comprising:

[0030] A signal acquisition assembly is installed inside the vehicle urea tank, comprising a temperature sensor, a liquid level sensor, a urea concentration sensor and a pressure sensor, which are respectively used to acquire the temperature signal of the urea solution in the urea tank, the liquid level signal of the urea solution, the concentration signal of the urea solution and the pressure value of the urea system; and transmit the acquired temperature signal, liquid level signal, concentration signal and pressure value of the urea system to the aftertreatment controller of the vehicle;

[0031] A nitrogen oxygen sensor is installed at the vehicle exhaust emission, which is used to acquire the nitrogen oxide emission value; and transmit the acquired nitrogen oxide emission value to the aftertreatment controller of the vehicle;

[0032] An aftertreatment controller is used to compare the received temperature signal, liquid level signal and concentration signal with the corresponding preset signal threshold value respectively, to judge whether the received acquisition signal is abnormal; and when the liquid level signal of the urea solution is abnormal, determine whether the urea system has urea liquid level false reporting by comparing the pressure value of the urea system with the preset pressure value, and when the concentration signal is abnormal, determine whether the urea system has urea concentration false reporting by comparing the nitrogen oxide emission value with the preset nitrogen oxide emission value;

[0033] The execution assembly comprises a degassing device, a urea pump and a three-way control valve installed at the urea pump, and is used for starting the degassing device to remove the bubbles existing on the surface of the urea liquid level sensor in the signal acquisition assembly to correct the urea liquid level signal when it is determined that the urea system has a urea liquid level false alarm; and starting the urea pump and the three-way control valve installed at the urea pump to perform self-circulation on the target urea solution under the condition of ensuring the normal operation of the urea system, so as to remove the bubbles existing on the surface of the urea concentration sensor in the signal acquisition assembly through the self-circulation to correct the urea concentration signal when it is determined that the urea system has a urea concentration false alarm.

[0034] The further improvement of the technical solution is that the execution assembly further comprises a heating module, which is used for thawing the urea system when the post-processing controller determines that the received temperature signal is less than or equal to a preset temperature threshold.

[0035] The further improvement of the technical solution is that the degassing device comprises a degassing motor, a first output shaft, a liquid level sensor degassing assembly, a driving bevel gear, a driven bevel gear, a second output shaft and a urea concentration sensor degassing assembly; the input end of the degassing motor is connected to the output end of the post-processing controller, the output end of the degassing motor is connected to the first end of the first output shaft, the second end of the first output shaft extends to the urea tank where the liquid level sensor is located, the liquid level sensor degassing assembly is fixed on the second end of the first output shaft, the driving bevel gear is sleeved on the first output shaft between the liquid level sensor degassing assembly and the degassing motor and is fixedly connected with the first output shaft; the driven bevel gear is engaged with the driving bevel gear, the second output shaft penetrates through the driven bevel gear and is fixedly connected with the driven bevel gear, the end of the second output shaft away from the driven bevel gear extends to the urea tank where the urea concentration sensor is located, and the urea concentration sensor degassing assembly is fixed on the end of the second output shaft away from the driven bevel gear.

[0036] In a third aspect, a terminal is provided, comprising:

[0037] a processor, a memory, wherein,

[0038] the memory is configured to store a computer program,

[0039] the processor is configured to call and run the computer program from the memory, so that the terminal executes the method of the terminal as described above.

[0040] In a fourth aspect, a computer storage medium is provided, and the computer readable storage medium stores instructions, when the instructions are run on a computer, the computer executes the method of the aspects described above.

[0041] The beneficial effects of the present application are that:

[0042] Improving detection accuracy and reliability: By comprehensively collecting multiple signals such as the temperature, liquid level, concentration and system pressure of the urea solution in the urea tank, and comparing them with the preset threshold, this method can more accurately determine whether there is a false alarm in the urea system. Especially when the liquid level and concentration signals are abnormal, by further comparing the urea system pressure value and the nitrogen oxide emission value, it effectively distinguishes false alarms from actual faults, improving the reliability of the system.

[0043] Intelligent correction of false alarms: When a false alarm of urea liquid level is determined, the gas removal device is started to remove the bubbles on the surface of the urea liquid level sensor, thereby correcting the liquid level signal and avoiding false alarms caused by bubble interference. When a false alarm of urea concentration is determined, the urea pump and three-way control valve are started to perform self-circulation on the target urea solution to remove the bubbles on the surface of the urea concentration sensor, correct the concentration signal, and ensure accurate detection of the urea concentration.

[0044] Strong adaptability: This method takes into account the influence of temperature on the performance of the urea system, and uses a heating module to thaw the urea system, ensuring normal operation in low temperature environments. At the same time, the use of mechanical gas removal devices and three-way control valves effectively deals with the interference of bubbles on sensor signal collection, enhancing the adaptability of the system.

[0045] Optimizing system performance: Through real-time monitoring and intelligent correction, this method effectively reduces the failure rate of the urea system, improves the stability and durability of the system, avoids serious problems such as vehicle torque limitation and inability to start caused by false alarms, and ensures normal operation of the vehicle and driving experience of the user.

[0046] In addition, the design principle of the present application is reliable, the structure is simple, and it has very wide application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, a brief introduction to the drawings needed in the embodiment or prior art description will be given below, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0048] Figure 1 is a schematic flowchart of the method of an embodiment of the present application.

[0049] Figure 2 is a control flowchart for normal start of the vehicle of the present application.

[0050] Figure 3 is a vehicle start control flowchart after urea filling of the present application.

[0051] Figure 4 is a schematic block diagram of the system of an embodiment of the present application.

[0052] Figure 5 The structural schematic diagram of the gas removal device for an embodiment of the present application.

[0053] Figure 6 The structural schematic diagram of a terminal provided by an embodiment of the present application.

[0054] T is a temperature signal of the urea solution; V is a liquid level signal of the urea solution; D is a concentration signal of the urea solution; L is a nitrogen oxide emission value; P is a pressure value of the urea system; T0 is a preset temperature threshold; V0 is a preset liquid level data; D1 is a preset lower concentration threshold of the urea concentration; D2 is a preset upper concentration threshold of the urea concentration; L0 is a preset lower threshold of the nitrogen oxide emission of the tail gas; P0 is a preset pressure value of the urea system.

[0055] 410 is a signal acquisition component, 411 is a temperature sensor, 412 is a liquid level sensor, 413 is a urea concentration sensor, 414 is a pressure sensor, 420 is a nitrogen oxide sensor, 430 is a post-processing controller, 440 is an execution component, 441 is a gas removal device, 442 is a urea pump, 443 is a three-way control valve, and 444 is a heating module.

[0056] 510 is a gas removal motor, 520 is a first output shaft, 530 is a liquid level sensor gas removal component, 540 is a driving bevel gear, 550 is a driven bevel gear, 560 is a second output shaft, and 570 is a urea concentration sensor gas removal component. DETAILED DESCRIPTION

[0057] In order to make the personnel in the technical field better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person of ordinary skill in the art without creative labor should belong to the protection scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0059] Figure 1 is a schematic flow chart of a vehicle urea system false alarm solving method provided by an embodiment of the present application. In which, Figure 1 The execution subject can be a vehicle urea system false alarm solving system. According to different needs, the order of steps in the flow chart can be changed, and some can be omitted.

[0060] As shown in Figure 1 , the method comprises:

[0061] Step 110, after the vehicle is powered on, the temperature signal of the urea solution in the urea tank, the liquid level signal of the urea solution, the concentration signal of the urea solution and the pressure value of the urea system are collected by the signal collection component installed in the urea tank of the vehicle; and the nitrogen oxide emission value is collected by the nitrogen oxide sensor installed at the exhaust emission of the vehicle; and the collected temperature signal, liquid level signal, concentration signal, pressure value of the urea system and nitrogen oxide emission value are transmitted to the aftertreatment controller of the vehicle;

[0062] Step 120, the aftertreatment controller compares the received temperature signal, liquid level signal and concentration signal with the corresponding preset signal threshold value respectively, judges whether the received collected signal is abnormal; and when the liquid level signal of the urea solution is abnormal, it is judged whether the urea system exists urea liquid level false alarm by comparing the pressure value of the urea system with the preset pressure value, and when the concentration signal is abnormal, it is judged whether the urea system exists urea concentration false alarm by comparing the nitrogen oxide emission value with the preset nitrogen oxide emission value;

[0063] Step 130, when it is judged that the urea system exists urea liquid level false alarm, the aftertreatment controller controls to start the degassing device to remove the bubbles existing on the surface of the urea liquid level sensor in the signal collection component, and corrects the urea liquid level signal; and when it is judged that the urea system exists urea concentration false alarm, the aftertreatment controller controls to start the urea pump and the three-way control valve installed at the urea pump, under the condition of ensuring the normal work of the urea system, to perform self-circulation on the target urea solution, remove the bubbles existing on the surface of the urea concentration sensor in the signal collection component through self-circulation, and correct the urea concentration signal.

[0064] In order to facilitate the understanding of the present application, the principle of the urea system false alarm solving method for vehicle of the present application is described further in combination with the process of solving the false alarm of the urea system for vehicle in the embodiment.

[0065] As shown in Figure 2 , the process of analyzing and solving the false alarm of the aftertreatment controller to the received temperature signal, liquid level signal, concentration signal, pressure value of the urea system and nitrogen oxide emission value is as follows:

[0066] L1, the aftertreatment controller judges whether the received temperature signal is less than or equal to the preset temperature threshold value; if yes, go to S1; if no, go to L3;

[0067] S1, start the vehicle at low temperature, control to start the heating module to thaw the urea system, and go to L2;

[0068] L2, determine whether the pressure value of the urea system is greater than or equal to a preset urea system pressure value; if not, go to S1; if yes, go to S3;

[0069] L3, determine whether the liquid level signal of the urea solution is greater than or equal to a preset liquid level data; if yes, go to S3; if not, go to S2;

[0070] S2, control the start of the urea pump to build pressure, and go to L4;

[0071] S3, the vehicle is normally running, control the urea injection system to start working, and go to L5;

[0072] L4, determine whether the pressure value of the urea system is greater than or equal to a preset urea system pressure value; if yes, go to S4; if not, go to S8;

[0073] S4, normally start the vehicle, the urea system starts working, determine that the urea system has a false report of urea liquid level, and go to S5;

[0074] S5, control the start of the degassing device to remove the bubbles existing on the surface of the urea liquid level sensor in the signal acquisition assembly, correct the urea liquid level signal; and go to L3;

[0075] L5, determine whether the concentration signal of the urea solution is greater than or equal to a first preset concentration threshold and less than or equal to a second preset concentration threshold, the first preset concentration threshold being less than the second preset concentration threshold; if not, go to L6; if yes, go to S7;

[0076] L6, determine whether the received nitrogen oxide emission value is greater than or equal to a preset nitrogen oxide emission value; if not, go to S6; if yes, go to S8;

[0077] S6, control the start of the urea pump and the three-way control valve, under the condition of ensuring the normal working of the urea system, perform self-circulation on the target urea solution, remove the bubbles existing on the surface of the urea concentration sensor in the signal acquisition assembly through self-circulation, correct the urea concentration signal; and go to L5;

[0078] S7, determine that the urea system is working normally, and the vehicle is running normally;

[0079] S8, determine that the urea system has a fault, and control the vehicle to stop and check.

[0080] Specifically, L1: after the vehicle starts, compare the collected urea temperature to with a preset temperature threshold T0; when to≤T0, the aftertreatment controller controls the urea system to enter a heating mode S1; the urea system is thawed through the heating mode; when to>T0, at this time the urea system does not have the risk of icing, the aftertreatment controller controls the system to enter L3;

[0081] L2: compare the collected urea system pressure value P with the preset urea system pressure value P0, if it is satisfied, enter S3; if it is not satisfied, enter S1. Through L2, the pressure build-up of the urea system in the thawing mode is judged, if the pressure cannot be built, the heating mode is continued, if the pressure can be built, the urea system can be normally started.

[0082] L3: compare the collected urea solution liquid level V with the preset liquid level V0, if it is satisfied, enter S3, if it is not satisfied, enter S2; this judgment is whether the urea liquid level meets the requirements of the urea system start, so as to judge the next control mode selection.

[0083] L4: compare the collected urea system pressure value P with the preset urea system pressure P0, if it is satisfied, enter S4; if it is not satisfied, enter S8; through L4, the pressure build-up ability of the urea pump in the normal mode is judged, if the pressure can be built, it means that the system liquid level is false, if the pressure cannot be built, it means that the urea system is insufficient or the urea system is faulty. In addition, whether the pressure value of the urea system after each pressure build-up is greater than or equal to the preset urea system pressure value is judged, and the pressure build-up ability of the urea pump is judged; if the urea pump can build pressure, go to S4, determine that the urea system has false urea liquid level; if the urea pump cannot build pressure, go to S8, determine that the urea system lacks urea and urea shortage signal, or determine that the urea system has a fault.

[0084] L5: compare the concentration D of the urea solution of the urea system with the first preset concentration threshold (urea concentration preset concentration lower threshold) D1 and the second preset concentration threshold (urea concentration preset concentration upper threshold) D2 (D2>D1), if it is satisfied D1≤D≤D2, enter S7, if it is not satisfied, enter L6; this step judges the urea concentration, if the urea concentration is within the allowable range, the vehicle can be normally driven, if the urea concentration is not within the reasonable range, the nitrogen oxide emission value (emission limit value) of the exhaust system is compared and analyzed to determine whether the urea concentration is false.

[0085] L6: determine the nitrogen oxides L in the exhaust gas and the preset nitrogen oxide emission value (preset working condition emission limit or exhaust gas emission nitrogen oxide preset lower threshold) L0, when L≥L0 is satisfied, enter S8, if it is not satisfied, enter S6. This judgment is to determine whether the urea solution concentration is false, if it is satisfied, it means that the urea system concentration display is accurate, if it is not satisfied, the urea concentration is false.

[0086] S1: low temperature vehicle start mode, when the ambient temperature is lower than the preset temperature threshold, the urea system will have freezing problem, according to the regulation requirements, the vehicle can be started first, then the urea pump heating module is started to thaw the urea system.

[0087] S2: Urea pump pressure building mode, when it is judged that the urea liquid level is not up to the preset threshold V1, the vehicle enters the pressure building mode, in which the vehicle controls the urea pump to start building pressure three times at intervals, starts the urea pump once every first preset time, builds pressure for the second preset time each time the urea pump is started, and judges whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value after each pressure building. If any one of the three pressure building meets the pressure requirement (i.e. the pressure value of the urea system is greater than or equal to the preset urea system pressure value), subsequent attempts are not required. If the three pressure building cannot meet the requirement (i.e. the pressure value of the urea system is less than the preset urea system pressure value after the three pressure building), a urea system failure or urea shortage signal is sent.

[0088] S3: Urea system working mode, when the urea system liquid level meets the requirement, the vehicle is allowed to start normally, and the urea system starts to work. In this working mode, the urea pump and the nozzle work according to the engine and vehicle working conditions under the control of the aftertreatment control HCU.

[0089] S4: Vehicle starting, urea system starting to work, when it is judged that the urea system can build pressure normally, it is indicated that the urea system liquid level is misreported, at this time the vehicle can be started normally, and the urea system starts to work, the vehicle can run normally, and the next step of liquid level correction is started.

[0090] S5: Mechanical degassing mode, after entering this mode, the urea system starts the urea liquid level correction mode, removes the bubbles existing in the urea system through the mechanical degassing device, controls the degassing device to start three times intermittently to remove the bubbles existing on the surface of the urea liquid level sensor in the signal acquisition assembly, starts the degassing device once every third preset time, removes the bubbles for the fourth preset time each time the degassing device is started, corrects the urea liquid level signal, and judges whether the urea solution liquid level signal is greater than or equal to the preset liquid level data after each time the degassing device is started. When it is judged that the urea solution liquid level signal is greater than or equal to the preset liquid level data after any one degassing, it goes to step S3. In this working condition, the urea system liquid level is gradually repaired, and the urea liquid level displays the actual liquid level value.

[0091] S6: Urea concentration repair mode, after entering this mode, the urea system repairs the urea concentration, controls the urea system to branch through the three-way control valve, under the condition of ensuring the normal work of the urea system, circulates part of the urea through the three-way valve, removes the bubbles existing on the surface of the urea concentration sensor through the self-circulation, collects the urea concentration data at intervals, and when the urea concentration returns to the normal range, the urea system exits this mode.

[0092] S7: After a series of correction decisions and corrections are made on the vehicle, the urea liquid level, concentration and emission limit are controlled within a reasonable range, the vehicle runs normally, and the urea system works normally.

[0093] S8: The urea system cannot work normally, the vehicle reports a urea system fault, after judgment and repair, the aftertreatment controller TCU and the engine ECU judge the working state of the urea system and the engine, and finally confirm that the urea system has a fault.

[0094] As shown in Figure 3 , the vehicle starting mode determination after urea filling: after the vehicle is filled with urea, the vehicle is powered on and started, the urea system controller TCU directly controls the urea system to work, and at the same time controls the mechanical degassing device to start, and the urea liquid level sensor is degassed, after degassing, the urea liquid level is judged, when V≥V0, the mechanical degassing device stops working, when it does not meet the requirements, continue to carry out degassing treatment; when the vehicle liquid level meets the requirements, the urea system controller TCU controls the urea nozzle to start working, and collects the nitrogen oxide value L in the tail gas through the nitrogen oxide sensor, when L≥L0, it indicates that the urea is abnormal, and the vehicle enters the limited torque mode; when it does not meet the requirements, the urea concentration value is determined; when D1≤D≤D2, the urea system works normally, and the vehicle runs normally, when it does not meet the requirements, it indicates that the urea system has bubble interference, at this time the three-way control valve is opened, the urea concentration sensor is degassed, and after D1≤D≤D2 is met, the urea three-way control valve stops working, and the vehicle enters the normal driving mode.

[0095] As shown in Figure 4 , the present application provides a kind of vehicle urea system false report solution system, including signal acquisition component, nitrogen oxide sensor, aftertreatment controller and execution component.

[0096] Among them, signal acquisition component is installed in the vehicle urea tank inside, including temperature sensor, liquid level sensor (installing at the bottom of urea tank), urea concentration sensor (using laser urea concentration sensor, installs in the side wall of urea tank) and pressure sensor, are used to collect the temperature signal of urea solution in urea tank, the liquid level signal of urea solution, the concentration signal of urea solution and the pressure value of urea system;And the temperature signal, liquid level signal, concentration signal and pressure value of urea system collected are transmitted to the aftertreatment controller of vehicle.

[0097] Nitrogen oxide sensor is installed at the vehicle exhaust emission, is used to collect nitrogen oxide emission value;And the nitrogen oxide emission value collected is transmitted to the aftertreatment controller of vehicle.

[0098] The post-processing controller is used for comparing the received temperature signal, liquid level signal and concentration signal with corresponding preset signal thresholds respectively to determine whether the received collection signals are abnormal; and when the liquid level signal of the urea solution is abnormal, the post-processing controller determines whether the urea system has urea liquid level false alarm by comparing the pressure value of the urea system with a preset pressure value, and when the concentration signal is abnormal, the post-processing controller determines whether the urea system has urea concentration false alarm by comparing the nitrogen oxide emission value with a preset nitrogen oxide emission value.

[0099] The execution assembly includes a degassing device, a urea pump and a three-way control valve installed at the urea pump, and is used for starting the degassing device to remove the bubbles existing on the surface of the urea liquid level sensor in the signal collection assembly to correct the urea liquid level signal when it is determined that the urea system has urea liquid level false alarm; and starting the urea pump and the three-way control valve installed at the urea pump to perform self-circulation on the target urea solution under the condition of ensuring the normal operation of the urea system, so as to remove the bubbles existing on the surface of the urea concentration sensor in the signal collection assembly through self-circulation to correct the urea concentration signal when it is determined that the urea system has urea concentration false alarm. In addition, the execution assembly further includes a heating module, which is used for thawing the urea system when the post-processing controller determines that the received temperature signal is less than or equal to a preset temperature threshold.

[0100] As shown in Figure 5 The degassing device includes a degassing motor 510, a first output shaft 520, a liquid level sensor degassing assembly 530, a driving bevel gear 540, a driven bevel gear 550, a second output shaft 560 and a urea concentration sensor degassing assembly 570. The input end of the degassing motor 510 is connected to the output end of the post-processing controller, the output end of the degassing motor 510 is connected to the first end of the first output shaft 520, the second end of the first output shaft 520 extends to the urea tank where the liquid level sensor is located, the liquid level sensor degassing assembly 530 is fixed on the second end of the first output shaft 520, the driving bevel gear 540 is sleeved on the first output shaft 520 between the liquid level sensor degassing assembly 530 and the degassing motor 510 and is fixedly connected with the first output shaft 520; the driven bevel gear 550 is engaged with the driving bevel gear 540, the second output shaft 560 penetrates through the driven bevel gear 550 and is fixedly connected with the driven bevel gear 550, one end of the second output shaft 560 away from the driven bevel gear 550 extends to the urea tank where the urea concentration sensor is located, and the urea concentration sensor degassing assembly 570 is fixed on the one end of the second output shaft 560 away from the driven bevel gear 550.

[0101] Figure 6 A structure schematic diagram of a terminal 600 is provided for the embodiments of the present application, and the terminal 600 can be used to execute the urea system false alarm solving method provided by the embodiments of the present application.

[0102] The terminal 600 can include a processor 610, a memory 620 and a communication module 630. These components communicate through one or more buses. Those skilled in the art can understand that the structure of the server shown in the figure does not constitute a limitation on the present application. It can be a bus structure or a star structure. It can also include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0103] The memory 620 can be used to store the execution instructions of the processor 610. The memory 620 can be implemented by any type of volatile or non-volatile storage terminal or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. When the execution instructions in the memory 620 are executed by the processor 610, the terminal 600 can execute some or all of the steps in the following method embodiments.

[0104] The processor 610 is the control center of the storage terminal. It connects all parts of the electronic terminal through various interfaces and lines. It executes the software programs and / or modules stored in the memory 620 and calls the data stored in the memory to perform various functions of the electronic terminal and / or process data. The processor can be composed of integrated circuits (IC), such as a single packaged IC or a combination of multiple packaged ICs with the same or different functions. For example, the processor 610 can only include a central processing unit (CPU). In the embodiments of the present application, the CPU can be a single operation core or can include multiple operation cores.

[0105] The communication module 630 is used to establish a communication channel so that the storage terminal can communicate with other terminals. It receives user data sent by other terminals or sends user data to other terminals.

[0106] The present application also provides a computer storage medium, which can store a program. When the program is executed, it can include some or all steps in the embodiments provided by the present application. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0107] Those skilled in the art can clearly understand that the technical solutions in the embodiments of the present application can be implemented by means of software plus necessary universal hardware platforms. Based on such an understanding, the technical solutions in the embodiments of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a USB flash disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, and includes a plurality of instructions for causing a computer terminal (which can be a personal computer, a server, or a second terminal, a network terminal, or the like) to execute all or part of the steps of the methods described in the embodiments of the present application.

[0108] In the present specification, the same or similar parts among various embodiments can be referred to each other. In particular, for the terminal embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

[0109] In several embodiments provided in the present application, it should be understood that the disclosed system and method can be implemented in other ways. For example, the system embodiments described above are merely schematic, for example, the division of the modules is only a logical function division, and actual implementation can have another division manner, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed modules can be indirect coupling or communication connection through some interfaces, systems or modules, and can be electrical, mechanical or other forms.

[0110] The modules described as separate components can or can not be physically separated, and the components displayed as modules can or can not be physical modules, that is, they can be located in one place, or can be distributed on a plurality of network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments.

[0111] In addition, the functional modules in each of the embodiments of the present application can be integrated in one processing module, or each module can exist physically independently, or two or more modules can be integrated in one module.

[0112] Although the present application has been described in detail with reference to the preferred embodiments, it should be understood that the application is not limited to those preferred embodiments. Various modifications and equivalents can be made by those skilled in the art without departing from the spirit and scope of the application. Any and all modifications and equivalents are intended to be included within the scope of the present application.

Claims

1. A method for solving false alarm of a urea system for vehicle, characterized by, The application relates to a vehicle urea solution level signal correction method. After the vehicle is powered on, a signal acquisition assembly installed in a urea tank of the vehicle acquires a temperature signal of urea solution in the urea tank, a liquid level signal of the urea solution, a concentration signal of the urea solution and a pressure value of a urea system; and a nitrogen oxide sensor installed at an exhaust emission position of the vehicle acquires a nitrogen oxide emission value; and the acquired temperature signal, liquid level signal, concentration signal, pressure value of the urea system and nitrogen oxide emission value are transmitted to an aftertreatment controller of the vehicle. The aftertreatment controller compares the received temperature signal, liquid level signal and concentration signal with corresponding preset signal thresholds respectively, judges whether the received acquisition signals are abnormal, judges whether the urea system has urea liquid level false alarms by comparing the pressure value of the urea system with a preset pressure value when the liquid level signal of the urea solution is abnormal, and judges whether the urea system has urea concentration false alarms by comparing the nitrogen oxide emission value with a preset nitrogen oxide emission value when the concentration signal is abnormal. When it is judged that the urea system has urea liquid level false alarms, the aftertreatment controller controls a degassing device to remove bubbles existing on a urea liquid level sensor surface of the signal acquisition assembly, and corrects the urea liquid level signal; and when it is judged that the urea system has urea concentration false alarms, the aftertreatment controller controls a urea pump and a three-way control valve installed at the urea pump to self-cycle target urea solution under the condition of ensuring normal operation of the urea system, removes bubbles existing on a urea concentration sensor surface of the signal acquisition assembly through self-cycling, and corrects the urea concentration signal.

2. The urea system false alarm resolution method of claim 1, wherein, The process of analyzing the received temperature signal, liquid level signal, concentration signal, pressure value of the urea system and nitrogen oxide emission value by the aftertreatment controller and solving false alarms is as follows: L1, the aftertreatment controller judges whether the received temperature signal is less than or equal to a preset temperature threshold; if yes, the process goes to S1; if no, the process goes to L3; S1, the vehicle is started at low temperature, a heating module is started to thaw the urea system, and the process goes to L2; L2, the process judges whether the pressure value of the urea system is greater than or equal to a preset urea system pressure value; if no, the process goes to S1; if yes, the process goes to S3; L3, the process judges whether the liquid level signal of the urea solution is greater than or equal to preset liquid level data; if yes, the process goes to S3; if no, the process goes to S2; S2, the urea pump is started to build pressure, and the process goes to L4; S3, the vehicle is normally operated, the urea injection system is started to work, and the process goes to L5; L4, the process judges whether the pressure value of the urea system is greater than or equal to a preset urea system pressure value; if yes, the process goes to S4; if no, the process goes to S8; S4, the vehicle is normally started, the urea system is started to work, it is judged that the urea system has urea liquid level false alarms, and the process goes to S5; S5, the degassing device is started to remove bubbles existing on the urea liquid level sensor surface of the signal acquisition assembly, the urea liquid level signal is corrected, and the process goes to L3; L5, the process judges whether the concentration signal of the urea solution is greater than or equal to a first preset concentration threshold and less than or equal to a second preset concentration threshold, the first preset concentration threshold is less than the second preset concentration threshold; if no, the process goes to L6; if yes, the process goes to S7; L6, determining whether the received nitrogen oxide emission value is greater than or equal to the preset nitrogen oxide emission value; if not, going to S6; if yes, going to S8; S6, controlling the start of the urea pump and the three-way control valve, and under the condition of ensuring the normal operation of the urea system, performing self-circulation on the target urea solution to remove the bubbles existing on the surface of the urea concentration sensor in the signal acquisition assembly through self-circulation, and correcting the urea concentration signal; and going to L5; S7, determining that the urea system is normally working and the vehicle is normally running; S8, determining that the urea system has a fault and controlling the vehicle to stop for inspection.

3. The urea system false positive resolution method of claim 2, wherein, Step S2 is specifically: controlling the urea pump to start three times for pressure building, starting the urea pump once every first preset time, starting the urea pump for pressure building for a second preset time each time, and determining whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value after each pressure building, and going to step S4 when the pressure value of the urea system is greater than or equal to the preset urea system pressure value in any one determination; if the pressure value of the urea system is less than the preset urea system pressure value after three pressure buildings, going to S8 and issuing a urea shortage signal.

4. The urea system false alarm resolution method of claim 3, wherein, Step L4 is specifically: determining whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value after each pressure building, and determining the pressure building capacity of the urea pump; if the urea pump can build pressure, going to S4 to determine that the urea system has a false urea liquid level report; if the urea pump cannot build pressure, going to S8 to determine that the urea system is short of urea and a urea shortage signal, or to determine that the urea system has a fault.

5. The urea system false positive resolution method of claim 2, wherein, Step S5 is specifically: controlling the vehicle to enter a mechanical degassing mode, controlling the degassing device to start three times intermittently to remove the bubbles existing on the surface of the urea liquid level sensor in the signal acquisition assembly, starting the degassing device once every third preset time, removing the bubbles for a fourth preset time each time to correct the urea liquid level signal, and determining whether the liquid level signal of the urea solution is greater than or equal to the preset liquid level data after starting the degassing device each time, and going to step S3 when the liquid level signal of the urea solution is greater than or equal to the preset liquid level data after any one degassing.

6. A urea system false positive resolution system for a vehicle, comprising: It comprises: a signal acquisition assembly installed inside the urea tank of the vehicle, comprising a temperature sensor, a liquid level sensor, a urea concentration sensor and a pressure sensor, which are respectively used to collect the temperature signal of the urea solution in the urea tank, the liquid level signal of the urea solution, the concentration signal of the urea solution and the pressure value of the urea system; and transmit the collected temperature signal, liquid level signal, concentration signal and pressure value of the urea system to the aftertreatment controller of the vehicle; a nitrogen oxide sensor installed at the exhaust emission of the vehicle, which is used to collect the nitrogen oxide emission value; and transmit the collected nitrogen oxide emission value to the aftertreatment controller of the vehicle; The post-processing controller is configured to compare the received temperature signal, liquid level signal and concentration signal with corresponding preset signal thresholds respectively, to determine whether the received collection signals are abnormal; when the liquid level signal of the urea solution is abnormal, the post-processing controller is configured to determine whether the urea system has a urea liquid level false alarm by comparing the pressure value of the urea system with a preset pressure value, and when the concentration signal is abnormal, the post-processing controller is configured to determine whether the urea system has a urea concentration false alarm by comparing the nitrogen oxide emission value with a preset nitrogen oxide emission value; The execution assembly includes a degassing device, a urea pump and a three-way control valve installed at the urea pump, and is configured to start the degassing device to remove bubbles existing on the surface of the urea liquid level sensor in the signal collection assembly to correct the urea liquid level signal when it is determined that the urea system has a urea liquid level false alarm; and start the urea pump and the three-way control valve installed at the urea pump to perform self-circulation of the target urea solution under the condition that the urea system works normally, to remove bubbles existing on the surface of the urea concentration sensor in the signal collection assembly by self-circulation to correct the urea concentration signal when it is determined that the urea system has a urea concentration false alarm.

7. The urea system false positive resolution system of claim 6, wherein, The execution assembly further includes a heating module configured to thaw the urea system when the post-processing controller determines that the received temperature signal is less than or equal to a preset temperature threshold.

8. The urea system false positive resolution system of claim 6, wherein, The degassing device includes a degassing motor, a first output shaft, a liquid level sensor degassing assembly, a driving bevel gear, a driven bevel gear, a second output shaft and a urea concentration sensor degassing assembly; the input end of the degassing motor is connected to the output end of the post-processing controller, the output end of the degassing motor is connected to the first end of the first output shaft, the second end of the first output shaft extends to the urea tank where the liquid level sensor is located, the liquid level sensor degassing assembly is fixed to the second end of the first output shaft, the driving bevel gear is sleeved on the first output shaft between the liquid level sensor degassing assembly and the degassing motor and is fixedly connected with the first output shaft; the driven bevel gear is engaged with the driving bevel gear, the second output shaft penetrates through the driven bevel gear and is fixedly connected with the driven bevel gear, the end of the second output shaft away from the driven bevel gear extends to the urea tank where the urea concentration sensor is located, and the urea concentration sensor degassing assembly is fixed to the end of the second output shaft away from the driven bevel gear.

9. A terminal, characterized by comprising: comprises: a processor; a memory for storing execution instructions of the processor; wherein the processor is configured to execute the method of any one of claims 1-5.

10. A computer readable storage medium storing a computer program, characterized in that, The program is executed by the processor to implement the method of any one of claims 1-5.

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