Vehicle urea system false alarm solving method

Abstract

The invention belongs to the technical field of vehicle inspection, and particularly relates to a vehicle urea system false alarm solving method and system, a terminal and a storage medium. A temperature signal, a liquid level signal and a concentration signal of a urea solution in a urea box and a pressure value of a urea system are collected through a signal collection assembly installed in the urea box of the vehicle; by comprehensively collecting a plurality of signals such as the temperature, the liquid level, the concentration and the system pressure of the urea solution in the urea box and comparing the signals with the preset threshold values, the method can more accurately judge whether the urea system has false alarms or not. Particularly, when the liquid level and concentration signals are abnormal, the pressure value of the urea system and the nitrogen oxide emission value are further compared, false alarm and actual faults are effectively distinguished, and the reliability of the system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle inspection, and in particular relates to a method, system, terminal and storage medium for solving false alarm problems of a vehicle urea system. Background Art

[0002] In the current vehicle emission control system, the urea system plays a vital role. Its core function is to significantly reduce the emission of nitrogen oxides by purifying the exhaust gas, while optimizing the engine performance and fuel consumption, thereby achieving the goal of reducing costs and reducing environmental pollution. However, the performance of the urea system is easily affected by the external environment, especially the change of temperature.

[0003] Under high temperature conditions, urea may deteriorate, resulting in a significant reduction in its purification effect. Under low temperature conditions, urea may freeze, which will not only block the system pipes, but may also damage the system. To make matters more complicated, temperature changes may also cause bubbles to form in the urea solution. Although these bubbles are small, once they adhere to the surface of the urea level sensor or concentration sensor, they will interfere with the signal acquisition, causing the system to be unable to accurately identify the level and concentration of the urea solution.

[0004] Currently, the industry mainly uses ultrasonic technology to detect the level and concentration of urea solution. This technology has the advantages of simple structure, easy reading, and convenient installation and maintenance. However, ultrasonic sensors are easily affected by bubbles and impurities in the solution during the detection process. In particular, bubbles are generated frequently when the urea solution experiences temperature fluctuations or large liquid disturbances. Once these bubbles adhere to the emitting or reflecting surface of the ultrasonic sensor, the system detection accuracy will decrease, or even cause false alarms.

[0005] The generation of false alarms not only affects the normal operation of the vehicle, but may also 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, most existing methods only focus on the collection and analysis of a single signal, while ignoring the comprehensive impact of multiple environmental factors on system performance. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method, system, terminal and storage medium for solving the above-mentioned technical problems.

[0007] In a first aspect, the present invention provides a solution to a false alarm of a vehicle urea system, comprising: 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 through the signal collection component installed inside the urea tank of the vehicle; and the nitrogen oxide emission value is collected through 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 post-processing controller of the vehicle; The post-processing controller compares the received temperature signal, liquid level signal, and concentration signal with the corresponding preset signal thresholds to determine whether the received acquisition signal is abnormal; and when the liquid level signal of the urea solution is abnormal, the post-processing 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 post-processing 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; When it is determined that there is a false alarm of urea liquid level in the urea system, the post-processing controller controls the start-up of the degassing device to remove the bubbles on the surface of the urea liquid level sensor in the signal acquisition component, and corrects the urea liquid level signal; and when it is determined that there is a false alarm of urea concentration in the urea system, the post-processing controller controls the start-up of the urea pump and the three-way control valve installed at the urea pump, and self-circulates the target urea solution while ensuring the normal operation of the urea system, removes the bubbles on the surface of the urea concentration sensor in the signal acquisition component through self-circulation, and corrects the urea concentration signal.

[0008] The technical solution is further improved in that the post-processing controller analyzes the received temperature signal, liquid level signal, concentration signal, pressure value of the urea system and nitrogen oxide emission value and solves the false alarm process as follows: L1, the post-processing controller determines whether the received temperature signal is less than or equal to the preset temperature threshold; if so, go to S1; if not, go to L3; S1, start the vehicle at low temperature, control the start-up heating module to defrost the urea system, and go to L2; L2, judging whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value; if not, go to S1; if yes, go to S3; L3, determine whether the liquid level signal of the urea solution is greater than or equal to the preset liquid level data; if so, go to S3; if not, go to S2; S2, control to start the urea pump to build pressure, and go to L4; S3: The vehicle runs normally, the urea injection system is controlled to start working, and the process goes to L5; L4, judging 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; S4, the vehicle is started normally, the urea system starts to work, it is determined that there is a false alarm of urea liquid level in the urea system, and the process goes to S5; S5, control the start of the degassing device to remove the 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; L5, determine whether the concentration signal of the urea solution is greater than or equal to the first preset concentration threshold and less than or equal to the second preset concentration threshold, and the first preset concentration threshold is less than the second preset concentration threshold; if not, go to L6; if yes, go to S7; 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 yes, go to S8; S6, control the start of the urea pump and the three-way control valve, and self-circulate the target urea solution while ensuring the normal operation of the urea system, remove the bubbles on the surface of the urea concentration sensor in the signal acquisition component through self-circulation, and correct the urea concentration signal; and go to L5; S7. Determine that the urea system and the vehicle operate normally; S8. Determine that there is a fault in the urea system and stop the vehicle for inspection.

[0009] 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 each time the urea pump is started, running for a second preset 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 when 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 after three pressure buildups, the pressure values ​​of the urea system are all less than the preset urea system pressure value, going to S8, and sending a urea shortage signal.

[0010] The technical solution is further improved in that step L4 is specifically as follows: determining whether the pressure value of the urea system after each pressure build-up is greater than or equal to a preset urea system pressure value, and determining the pressure building capacity of the urea pump; if the urea pump is able to build pressure, then turning to S4, determining that there is a false alarm of urea liquid level in the urea system; if the urea pump is unable to build pressure, then turning to S8, determining that there is a lack of urea in the urea system and a urea lack signal, or determining that there is a fault in the urea system.

[0011] The technical solution is further improved in that step S5 is specifically as follows: controlling the vehicle to enter the mechanical degassing mode, controlling the degassing device to start intermittently three times to remove bubbles on the surface of the urea liquid level sensor in the signal acquisition component, starting the degassing device once every third preset time, and each time the degassing device is started to run for a fourth preset time to remove bubbles, correct the urea liquid level signal, and after each start of the degassing device, judging whether the liquid level signal of the urea solution is greater than or equal to the preset liquid level data, and when it is judged that the liquid level signal of the urea solution is greater than or equal to the preset liquid level data after any degassing, go to step S3.

[0012] In a second aspect, the present invention provides a system for resolving false alarms of a vehicle urea system, comprising: The signal acquisition component is installed inside the vehicle urea tank, and includes 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 vehicle's post-processing controller; The nitrogen oxide sensor is installed at the exhaust gas discharge of the vehicle to collect the nitrogen oxide emission value; and transmit the collected nitrogen oxide emission value to the vehicle's post-processing controller; A post-processing controller is used to compare the received temperature signal, liquid level signal, and concentration signal with the corresponding preset signal thresholds, respectively, to determine whether the received acquisition signal is abnormal; and when the liquid level signal of the urea solution is abnormal, to determine 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, to determine whether the urea system has a urea concentration false alarm by comparing the nitrogen oxide emission value with the preset nitrogen oxide emission value; The execution component 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 bubbles on the surface of the urea liquid level sensor in the signal acquisition component when it is determined that the urea system has a false alarm of urea liquid level, and correcting the urea liquid level signal; and when it is determined that the urea system has a false alarm of urea concentration, starting the urea pump and the three-way control valve installed at the urea pump, and self-circulating the target urea solution while ensuring the normal operation of the urea system, removing bubbles on the surface of the urea concentration sensor in the signal acquisition component through self-circulation, and correcting the urea concentration signal.

[0013] The technical solution is further improved in that the execution component also includes a heating module, which is used to defrost the urea system when the post-processing controller determines that the received temperature signal is less than or equal to a preset temperature threshold.

[0014] The technical solution is further improved in that the degassing device includes a degassing motor, a first output shaft, a liquid level sensor degassing component, a driving bevel gear, a driven bevel gear, a second output shaft, and a urea concentration sensor degassing component; 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 component 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 component and the degassing motor, and is fixedly connected to the first output shaft; the driven bevel gear is meshed with the driving bevel gear, the second output shaft passes through the driven bevel gear and is fixedly connected to 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 component is fixed to the end of the second output shaft away from the driven bevel gear.

[0015] In a third aspect, a terminal is provided, including: processor, memory, wherein: The memory is used to store computer programs. The processor is used to call and run the computer program from the memory, so that the terminal executes the above-mentioned terminal method.

[0016] According to a fourth aspect, a computer storage medium is provided, wherein the computer-readable storage medium stores instructions, and when the instructions are executed on a computer, the computer executes the methods described in the above aspects.

[0017] The beneficial effects of the present invention are: Improve 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. In particular, 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 between false alarms and actual faults, thereby improving the reliability of the system.

[0018] Intelligent correction of false alarms: When it is determined that there is a false alarm of urea liquid level, the bubbles on the surface of the urea liquid level sensor are removed by starting the degassing device, thereby correcting the liquid level signal and avoiding false alarms caused by bubble interference. When it is determined that there is a false alarm of urea concentration, the urea pump and the three-way control valve are started to self-circulate the target urea solution, remove the bubbles on the surface of the urea concentration sensor, correct the concentration signal, and ensure accurate detection of urea concentration.

[0019] Strong adaptability: This method takes into account the impact of temperature on the performance of the urea system, and defrosts the urea system through a heating module to ensure normal operation in a low-temperature environment. At the same time, through the flexible use of mechanical degassing devices and three-way control valves, the interference of bubbles on sensor signal acquisition is effectively dealt with, enhancing the adaptability of the system.

[0020] Optimize system performance: Through real-time monitoring and intelligent correction, this method effectively reduces the failure rate of the urea system and improves the stability and durability of the system. It avoids serious problems such as vehicle torque limitation and inability to start due to false alarms, ensuring the normal operation of the vehicle and the user's driving experience.

[0021] In addition, the invention has a reliable design principle, a simple structure and a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 is a schematic flow chart of a method according to an embodiment of the present invention.

[0024] Figure 2 This is a control flow chart for normal vehicle startup of the present invention.

[0025] Figure 3 This is a flow chart of vehicle startup control after urea addition according to the present invention.

[0026] Figure 4 is a schematic block diagram of a system according to an embodiment of the present invention.

[0027] Figure 5 The figure is a schematic structural diagram of a degassing device according to an embodiment of the present invention.

[0028] Figure 6 A schematic diagram of the structure of a terminal provided by an embodiment of the present invention.

[0029] T is the temperature signal of the urea solution; V is the liquid level signal of the urea solution; D is the concentration signal of the urea solution; L is the nitrogen oxide emission value; P is the pressure value of the urea system; T0 is the preset temperature threshold; V0 is the preset liquid level data; D1 is the preset lower limit threshold of the urea concentration; D2 is the preset upper limit threshold of the urea concentration; L0 is the preset lower limit threshold of the exhaust emission nitrogen oxides; P0 is the preset urea system pressure value.

[0030] 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 actuator, 441 is a degassing device, 442 is a urea pump, 443 is a three-way control valve, and 444 is a heating module.

[0031] 510 is a degassing motor, 520 is a first output shaft, 530 is a degassing assembly of a liquid level sensor, 540 is a driving bevel gear, 550 is a driven bevel gear, 560 is a second output shaft, and 570 is a degassing assembly of a urea concentration sensor. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] Figure 1 This is a schematic flow chart of a method for resolving a false alarm of a vehicle urea system provided by an embodiment of the present invention. Figure 1 The execution subject may be a vehicle urea system false alarm solution system. According to different requirements, the order of the steps in the flow chart may be changed, and some may be omitted.

[0035] like Figure 1 As shown, the method includes: 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 a signal collection component installed inside the urea tank of the vehicle; and the nitrogen oxide emission value is collected by a nitrogen oxide sensor installed at the exhaust emission position 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 post-processing controller of the vehicle; Step 120, the post-processing controller compares the received temperature signal, liquid level signal, and concentration signal with the corresponding preset signal thresholds, respectively, to determine whether the received acquisition signal is abnormal; and when the liquid level signal of the urea solution is abnormal, the post-processing 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 post-processing 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; Step 130, when it is determined that the urea system has a urea level false alarm, the post-processing controller controls the start of the degassing device to remove the bubbles on the surface of the urea level sensor in the signal acquisition component, and corrects the urea level signal; and when it is determined that the urea system has a urea concentration false alarm, the post-processing controller controls the start of the urea pump and the three-way control valve installed at the urea pump, and self-circulates the target urea solution while ensuring the normal operation of the urea system, removes the bubbles on the surface of the urea concentration sensor in the signal acquisition component through the self-circulation, and corrects the urea concentration signal.

[0036] In order to facilitate the understanding of the present invention, the following is a further description of the false alarm solution of the vehicle urea system provided by the present invention based on the principle of the false alarm solution of the vehicle urea system of the present invention and the process of solving the false alarm of the vehicle urea system in the embodiment.

[0037] like Figure 2 As shown, the process by which the post-processing controller analyzes the received temperature signal, liquid level signal, concentration signal, pressure value of the urea system and nitrogen oxide emission value and resolves false alarms is as follows: L1, the post-processing controller determines whether the received temperature signal is less than or equal to the preset temperature threshold; if so, go to S1; if not, go to L3; S1, start the vehicle at low temperature, control the start-up heating module to defrost the urea system, and go to L2; L2, judging whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value; if not, go to S1; if yes, go to S3; L3, determine whether the liquid level signal of the urea solution is greater than or equal to the preset liquid level data; if so, go to S3; if not, go to S2; S2, control to start the urea pump to build pressure, and go to L4; S3: The vehicle runs normally, the urea injection system is controlled to start working, and the process goes to L5; L4, judging 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; S4, the vehicle is started normally, the urea system starts to work, it is determined that there is a false alarm of urea liquid level in the urea system, and the process goes to S5; S5, control the start of the degassing device to remove the 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; L5, determine whether the concentration signal of the urea solution is greater than or equal to the first preset concentration threshold and less than or equal to the second preset concentration threshold, and the first preset concentration threshold is less than the second preset concentration threshold; if not, go to L6; if yes, go to S7; 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 yes, go to S8; S6, control the start of the urea pump and the three-way control valve, and self-circulate the target urea solution while ensuring the normal operation of the urea system, remove the bubbles on the surface of the urea concentration sensor in the signal acquisition component through self-circulation, and correct the urea concentration signal; and go to L5; S7. Determine that the urea system and the vehicle operate normally; S8. Determine that there is a fault in the urea system and stop the vehicle for inspection.

[0038] Specifically, L1: After the vehicle is started, the collected urea temperature to is compared with the preset temperature threshold T0. When to≤T0, the post-treatment controller controls the urea system to enter the heating mode S1; the urea system is thawed by the heating mode; when to>T0, there is no risk of icing in the urea system, and the post-treatment controller controls the system to enter L3; L2: Compare and judge the collected urea system pressure value P with the preset urea system pressure value P0. If the conditions are met, enter S3; if not, enter S1. L2 is used to judge the pressure buildup of the urea system in the thawing mode. If the pressure cannot be built, the heating mode is maintained. If the pressure can be built, the urea system can be started normally.

[0039] L3: Compare and judge the collected urea solution level V with the preset level V0. If the level meets the requirements, enter S3; if not, enter S2. This determines whether the urea level meets the urea system startup requirements, so as to determine the next control mode selection.

[0040] L4: Compare and judge the collected urea system pressure value P and the preset urea system pressure P0. If they meet, enter S4; if not, enter S8; judge the pressure-building capacity of the urea pump in normal mode through L4. If the pressure can be built, it means that there is a false alarm of the system liquid level. If the pressure cannot be built, there is insufficient urea in the urea system or a urea system failure. In addition, judge 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, and judge the pressure-building capacity of the urea pump; if the urea pump can build pressure, go to S4 and judge that there is a false alarm of the urea liquid level in the urea system; if the urea pump cannot build pressure, go to S8 and judge that there is a lack of urea in the urea system and a urea lack signal, or judge that there is a failure in the urea system.

[0041] L5: Compare and judge the concentration D of the urea solution in the urea system with the first preset concentration threshold (preset lower limit threshold of urea concentration) D1 and the second preset concentration threshold (preset upper limit threshold of urea concentration) D2 (D2>D1). If D1≤D≤D2 is satisfied, enter S7; if not, enter L6; this step judges the urea concentration. If the urea concentration is within the allowable range, the vehicle drives normally. If the urea concentration is not within a reasonable range, the nitrogen oxide emission value (emission limit) of the exhaust system is compared and analyzed to determine whether there is a false alarm in the urea concentration.

[0042] L6: Determine the nitrogen oxides L in the exhaust gas and the preset nitrogen oxide emission value (preset operating condition emission limit or preset lower limit threshold of exhaust gas nitrogen oxides) L0. When L≥L0 is satisfied, enter S8, if not, enter S6. This judgment is to determine whether there is a false alarm in the urea solution concentration. If it is satisfied, it means that the urea system concentration display is accurate. If it is not satisfied, the urea concentration is falsely reported.

[0043] S1: Low temperature vehicle starting mode. When the ambient temperature is lower than the preset temperature threshold, the urea system will freeze. According to regulatory requirements, you can start the vehicle first, and then start the urea pump heating module to defrost the urea system.

[0044] S2: Urea pump pressure building mode. When it is determined that the urea liquid level is not less than the preset threshold value V1, the vehicle enters the pressure building mode. In this mode, the vehicle controls the urea pump to start and build pressure three times at intervals. The urea pump is started once every first preset time. Each time the urea pump is started, it runs for a second preset time to build pressure. After each pressure building, it is determined whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value. If any one of the three pressure building meets the pressure requirement (that is, it is determined that the pressure value of the urea system is greater than or equal to the preset urea system pressure value at any one time), no subsequent attempts are required. If the three pressure building cannot meet the requirement (that is, after the three pressure building, the pressure values ​​of the urea system are all less than the preset urea system pressure value), a urea system failure or urea shortage signal is issued.

[0045] S3: Urea system working mode. When the urea system liquid level meets the requirements, the vehicle is allowed to start normally and the urea system starts to work. In this working mode, the urea pump and nozzle work according to the engine and vehicle operating conditions under the control of the post-processing control HCU.

[0046] S4: The vehicle is started and the urea system starts to work. If it is determined that the urea system can build pressure normally, it means that there is a false alarm of the urea system liquid level. At this time, the vehicle can be started normally and the urea system can be controlled to start working. The vehicle can operate normally and the next liquid level correction work is started at the same time.

[0047] S5: Mechanical degassing mode. After entering this mode, the urea system starts the urea liquid level correction mode, removes bubbles in the urea system through the mechanical degassing device, controls the degassing device to start intermittently three times to remove bubbles on the surface of the urea liquid level sensor in the signal acquisition component, starts the degassing device once every third preset time, and removes bubbles and corrects the urea liquid level signal each time the degassing device is started for a fourth preset time. After each start of the degassing device, it is determined whether the liquid level signal of the urea solution is greater than or equal to the preset liquid level data. When it is determined that the liquid level signal of the urea solution is greater than or equal to the preset liquid level data after any degassing, go to step S3. Under this working condition, the liquid level of the urea system is gradually repaired, and the urea liquid level displays the actual liquid level value.

[0048] S6: Urea concentration repair mode. After entering this mode, the urea system repairs the urea concentration and controls the urea system diversion through the three-way control valve. Under the condition of ensuring the normal operation of the urea system, the three-way valve is used to self-circulate part of the urea. The bubbles on the surface of the urea concentration sensor are removed through self-circulation, and the urea concentration data is collected at intervals. When the urea concentration returns to the normal range, the urea system exits this mode.

[0049] S7: After a series of corrections and corrections to the vehicle, the urea level, concentration and emission limits are all controlled within a reasonable range, the vehicle operates normally, and the urea system operates normally.

[0050] S8: The urea system cannot work normally. The vehicle reports a urea system fault. After judgment and repair, the post-processing controller TCU and the engine ECU judge the working status of the urea system and the engine, and finally confirm that there is a fault in the urea system.

[0051] like Figure 3 As shown, the vehicle starting mode is determined after urea filling: when the vehicle is filled with urea, the vehicle is powered on and started, and the urea system controller TCU directly controls the urea system to work, and at the same time controls the mechanical degassing device to start, degasses the urea liquid level sensor, and judges the urea liquid level after degassing. When V≥V0, the mechanical degassing device stops working, and continues to degas when the requirements are not met; 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 exhaust gas through the nitrogen oxide sensor. When L≥L0, it indicates that there is an abnormality in the urea, and the vehicle enters the torque limit mode; when the requirements are not met, the urea concentration value is determined; when the urea concentration D1≤D≤D2, the urea system works normally and the vehicle runs normally. When this requirement is not met, it means that there is bubble interference in the urea system. At this time, the three-way control valve is opened to degas the urea concentration sensor until D1≤D≤D2 is met, the urea three-way control valve stops working, and the vehicle enters the normal driving mode.

[0052] like Figure 4 As shown, the present invention provides a system for resolving false alarms of a vehicle urea system, comprising a signal acquisition component, a nitrogen oxide sensor, a post-processing controller and an execution component.

[0053] Among them, the signal acquisition component is installed inside the vehicle's urea tank, including a temperature sensor, a liquid level sensor (installed at the bottom of the urea tank), a urea concentration sensor (using a laser urea concentration sensor, installed on the side wall of the urea tank) 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 vehicle's post-processing controller.

[0054] The nitrogen oxide sensor is installed at the exhaust emission point of the vehicle to collect nitrogen oxide emission values; and transmit the collected nitrogen oxide emission values ​​to the vehicle's post-processing controller.

[0055] The post-processing controller is used to compare the received temperature signal, liquid level signal, and concentration signal with the corresponding preset signal thresholds respectively to determine whether the received acquisition signal is abnormal; and when the liquid level signal of the urea solution is abnormal, it is determined 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; when the concentration signal is abnormal, it is determined whether the urea system has a urea concentration false alarm by comparing the nitrogen oxide emission value with the preset nitrogen oxide emission value.

[0056] The execution component includes a degassing device, a urea pump and a three-way control valve installed at the urea pump, which is used to start the degassing device to remove the bubbles on the surface of the urea level sensor in the signal acquisition component and correct the urea level signal when it is determined that the urea system has a false alarm of urea level; and when it is determined that the urea system has a false alarm of urea concentration, start the urea pump and the three-way control valve installed at the urea pump, and self-circulate the target urea solution while ensuring the normal operation of the urea system, and remove the bubbles on the surface of the urea concentration sensor in the signal acquisition component through self-circulation to correct the urea concentration signal. In addition, the execution component also includes a heating module, which is used to defrost the urea system when the post-processing controller determines that the received temperature signal is less than or equal to the preset temperature threshold.

[0057] like Figure 5 As shown, 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, and the liquid level sensor degassing assembly 530 is fixed to 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 to the first output shaft 520; the driven bevel gear 550 is meshed with the driving bevel gear 540, and the second output shaft 560 passes through the driven bevel gear 550 and is fixedly connected to the driven bevel gear 550, and 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 to one end of the second output shaft 560 away from the driven bevel gear 550.

[0058] Figure 6 The present invention is a schematic diagram of the structure of a terminal 600 provided in an embodiment of the present invention. The terminal 600 can be used to implement the false alarm solution of the vehicle urea system provided in an embodiment of the present invention.

[0059] The terminal 600 may include: a processor 610, a memory 620 and a communication module 630. These components communicate via one or more buses. Those skilled in the art will appreciate that the server structure shown in the figure does not limit the present invention, and it may be a bus structure or a star structure, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0060] 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 memory, 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.

[0061] The processor 610 is the control center of the storage terminal, and uses various interfaces and lines to connect various parts of the entire electronic terminal. It runs or executes software programs and / or modules stored in the memory 620, and calls data stored in the memory to perform various functions of the electronic terminal and / or process data. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed 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 embodiment of the present invention, the CPU can be a single computing core or multiple computing cores.

[0062] The communication module 630 is used to establish a communication channel so that the storage terminal can communicate with other terminals, receive user data sent by other terminals or send user data to other terminals.

[0063] The present invention also provides a computer storage medium, wherein the computer storage medium may store a program, and when the program is executed, the program may include some or all of the steps in each embodiment provided by the present invention. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0064] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution in the embodiments of the present invention, in essence or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes, including several instructions for enabling a computer terminal (which can be a personal computer, a server, or a second terminal, a network terminal, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention.

[0065] In this specification, the same or similar parts between the various embodiments can be referred to each other. In particular, for the terminal embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method embodiment.

[0066] In the several embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of systems or modules, which can be electrical, mechanical or other forms.

[0067] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0068] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0069] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A solution to the false alarm of the vehicle urea system, characterized in that: include: 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 through the signal collection component installed inside the urea tank of the vehicle; and the nitrogen oxide emission value is collected through 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 post-processing controller of the vehicle; The post-processing controller compares the received temperature signal, liquid level signal, and concentration signal with the corresponding preset signal thresholds to determine whether the received acquisition signal is abnormal; and when the liquid level signal of the urea solution is abnormal, the post-processing 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 post-processing 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; When it is determined that there is a false alarm of urea liquid level in the urea system, the post-processing controller controls the start-up of the degassing device to remove the bubbles on the surface of the urea liquid level sensor in the signal acquisition component, and corrects the urea liquid level signal; and when it is determined that there is a false alarm of urea concentration in the urea system, the post-processing controller controls the start-up of the urea pump and the three-way control valve installed at the urea pump, and self-circulates the target urea solution while ensuring the normal operation of the urea system, removes the bubbles on the surface of the urea concentration sensor in the signal acquisition component through self-circulation, and corrects the urea concentration signal.

2. The method for solving the false alarm of the vehicle urea system according to claim 1, characterized in that: The process by which the post-processing controller analyzes the received temperature signal, liquid level signal, concentration signal, urea system pressure value and nitrogen oxide emission value and resolves false alarms is as follows: L1, the post-processing controller determines whether the received temperature signal is less than or equal to the preset temperature threshold; if so, go to S1; if not, go to L3; S1, start the vehicle at low temperature, control the start-up heating module to defrost the urea system, and go to L2; L2, judging whether the pressure value of the urea system is greater than or equal to the preset urea system pressure value; if not, go to S1; if yes, go to S3; L3, determine whether the liquid level signal of the urea solution is greater than or equal to the preset liquid level data; if so, go to S3; if not, go to S2; S2, control to start the urea pump to build pressure, and go to L4; S3: The vehicle runs normally, the urea injection system is controlled to start working, and the process goes to L5; L4, judging 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; S4, the vehicle is started normally, the urea system starts to work, it is determined that there is a false alarm of urea liquid level in the urea system, and the process goes to S5; S5, control the start of the degassing device to remove the 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; L5, determine whether the concentration signal of the urea solution is greater than or equal to the first preset concentration threshold and less than or equal to the second preset concentration threshold, and the first preset concentration threshold is less than the second preset concentration threshold; if not, go to L6; if yes, go to S7; 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 yes, go to S8; S6, controlling and starting the urea pump and the three-way control valve, and self-circulating the target urea solution while ensuring the normal operation of the urea system, removing bubbles on the surface of the urea concentration sensor in the signal acquisition component through self-circulation, and correcting the urea concentration signal; and go to L5; S7. Determine that the urea system and the vehicle operate normally; S8. Determine that there is a fault in the urea system and stop the vehicle for inspection.

3. The method for solving the false alarm of the vehicle urea system according to claim 2, characterized 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 each time the urea pump is started, running for a second preset 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 when 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 after the pressure buildup three times, the pressure value of the urea system is less than the preset urea system pressure value, going to S8, and sending a urea shortage signal.

4. The method for solving the false alarm of the vehicle urea system according to claim 3, characterized in that: Step L4 is specifically: determining whether the pressure value of the urea system after each pressure buildup is greater than or equal to a preset urea system pressure value, and determining the pressure building capacity of the urea pump; if the urea pump is able to build up pressure, then going to S4 to determine whether there is a urea liquid level false alarm in the urea system; If the urea pump cannot build up pressure, the process goes to S8 to determine that there is a lack of urea in the urea system and a urea lack signal, or that there is a fault in the urea system.

5. The method for solving the false alarm of the vehicle urea system according to claim 2, characterized in that: Step S5 is specifically as follows: controlling the vehicle to enter the mechanical degassing mode, controlling the degassing device to start intermittently three times to remove bubbles on the surface of the urea liquid level sensor in the signal acquisition component, starting the degassing device once every third preset time, and each time the degassing device is started to run for a fourth preset time to remove bubbles, correcting the urea liquid level signal, and after each start of the degassing device, judging whether the liquid level signal of the urea solution is greater than or equal to the preset liquid level data, and when it is judged that the liquid level signal of the urea solution is greater than or equal to the preset liquid level data after any degassing, go to step S3.

6. A system for solving false alarms of vehicle urea system, characterized in that: include: The signal acquisition component is installed inside the vehicle urea tank, and includes 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 vehicle's post-processing controller; The nitrogen oxide sensor is installed at the exhaust gas discharge of the vehicle to collect the nitrogen oxide emission value; and transmit the collected nitrogen oxide emission value to the vehicle's post-processing controller; A post-processing controller is used to compare the received temperature signal, liquid level signal, and concentration signal with the corresponding preset signal thresholds, respectively, to determine whether the received acquisition signal is abnormal; and when the liquid level signal of the urea solution is abnormal, to determine 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, to determine whether the urea system has a urea concentration false alarm by comparing the nitrogen oxide emission value with the preset nitrogen oxide emission value; An actuator assembly, including a degassing device, a urea pump and a three-way control valve installed at the urea pump, which is used to start the degassing device to remove bubbles on the surface of the urea level sensor in the signal acquisition assembly and correct the urea level signal when it is determined that there is a false alarm of urea level in the urea system; When it is determined that the urea system has a false alarm of urea concentration, the urea pump and the three-way control valve installed at the urea pump are started. While ensuring the normal operation of the urea system, the target urea solution is self-circulated. The bubbles on the surface of the urea concentration sensor in the signal acquisition component are removed through self-circulation to correct the urea concentration signal.

7. The vehicle urea system false alarm solution system according to claim 6, characterized in that: The execution component also includes a heating module, which is used to defrost 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 vehicle urea system false alarm solution system according to claim 6, characterized in that: 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 to the first output shaft; the driven bevel gear is meshed with the driving bevel gear, the second output shaft passes through the driven bevel gear and is fixedly connected to 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 in that: include: processor; A memory for storing execution instructions of the processor; The processor is configured to execute the method according to any one of claims 1 to 5.

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

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