Dual-nozzle-based urea injection amount detection method, device, vehicle, and medium

Abstract

The application discloses a urea injection amount detection method and device based on double nozzles, a vehicle and a medium. The urea injection amount detection method based on double nozzles comprises the following steps: when it is detected that a urea injection amount consumption deviation fault release condition is met, two nozzles are opened at a set opening degree, and current nozzle injection flow rates of the two nozzles are obtained; when the current nozzle injection flow rates are not within a first nozzle injection flow rate threshold range, the two nozzles are opened at the set opening degree respectively, and first nozzle injection flow rates and second nozzle injection flow rates of the two nozzles are obtained respectively; whether the first nozzle injection flow rates and the second nozzle injection flow rates are within a second nozzle injection flow rate threshold range is judged respectively, and whether to report a urea injection amount consumption deviation fault of the two nozzles is determined according to a result of whether the first nozzle injection flow rates and the second nozzle injection flow rates are within the second nozzle injection flow rate threshold range. The application realizes flexible injection amount deviation detection on nozzles of a double-nozzle injection system.

Description

Technical Field

[0001] This invention relates to the field of dual-nozzle aftertreatment system technology, and more particularly to a method, device, vehicle, and medium for detecting urea injection volume based on dual nozzles. Background Technology

[0002] As national regulations on vehicle exhaust emissions become increasingly stringent, SCR (Selective Catalytic Reduction) systems are typically installed in vehicles to reduce NOx levels in exhaust gases. These systems precisely inject high-pressure urea solution into the exhaust pipe, where it reacts with NOx to produce N2 and H2O. The precision of the urea solution injection is a crucial factor affecting NOx emissions from vehicle exhaust.

[0003] To improve the flexibility of urea injection control, a dual-nozzle urea injection system with two nozzles is provided. Currently, detecting urea solution consumption deviation in a dual-nozzle urea injection system requires separate testing of each nozzle, prolonging the diagnostic time of the aftertreatment system. Furthermore, pump pressure testing necessitates stopping urea injection, increasing the risk of exceeding vehicle exhaust emission standards. Summary of the Invention

[0004] This invention provides a method, device, vehicle, and medium for detecting urea injection volume based on dual nozzles, in order to solve the problems of long diagnostic time caused by detecting the injection volume deviation of each nozzle in a dual-nozzle urea injection system separately, and the increased risk of vehicle exhaust emissions exceeding standards due to the need to stop urea injection for detection.

[0005] According to one aspect of the present invention, a method for detecting urea injection volume based on a dual-nozzle system is provided, the method comprising:

[0006] When the release condition for urea injection volume consumption deviation is met, both nozzles are opened simultaneously at the set opening degree, and the current nozzle injection flow rate of the two nozzles is obtained.

[0007] When the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range, two nozzles are opened with a set opening degree, and the first nozzle injection flow rate and the second nozzle injection flow rate of the two nozzles are obtained respectively.

[0008] Determine whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate, and determine whether to report a urea injection volume consumption deviation fault of the two nozzles based on the determination results of whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate.

[0009] Optionally, the urea injection quantity consumption deviation fault release conditions include: the exhaust temperature upstream of the SCR is within the set temperature range, the ammonia storage in the SCR catalyst is within the set ammonia storage range, and the engine fuel injection quantity is within the set fuel injection quantity range.

[0010] The fault release conditions for urea injection volume consumption deviation were detected, including:

[0011] When the upstream exhaust temperature of the SCR is detected to be within the set temperature range, the ammonia storage of the SCR catalyst is within the set ammonia storage range, and the fuel injection quantity of the engine is within the set fuel injection quantity range, it is determined that the urea injection quantity consumption deviation fault release condition is met.

[0012] Optionally, the dual-nozzle-based urea injection quantity detection method further includes:

[0013] After confirming that the SCR conversion efficiency was normal and there was no ammonia leakage, it was determined that both nozzles were in normal condition.

[0014] Two nozzles are simultaneously opened at a set opening degree, and the reference nozzle injection flow rates of the two nozzles are obtained. Based on these reference nozzle injection flow rates, a first reference nozzle injection flow rate, a second reference nozzle injection flow rate, and a third reference nozzle injection flow rate are determined.

[0015] Optionally, the first nozzle injection flow rate threshold range is when the current nozzle injection flow rate is between the first reference nozzle injection flow rate and the second reference nozzle injection flow rate, wherein the first reference nozzle injection flow rate is less than the second reference nozzle injection flow rate;

[0016] The statement that the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range includes:

[0017] If the current nozzle injection flow rate is less than or equal to the first reference nozzle injection flow rate, or if the current nozzle injection flow rate is greater than or equal to the second reference nozzle injection flow rate, then it is determined that the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range.

[0018] Optionally, the second nozzle injection flow rate threshold range is when the current nozzle injection flow rate is between the first reference nozzle injection flow rate and the third reference nozzle injection flow rate, wherein the third reference nozzle injection flow rate is less than the first reference nozzle injection flow rate;

[0019] Determine whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate, including:

[0020] Determine whether the injection flow rate of the first nozzle is greater than the injection flow rate of the third reference nozzle, and less than the injection flow rate of the first reference nozzle; and,

[0021] Determine whether the injection flow rate of the second nozzle is greater than the injection flow rate of the third reference nozzle and less than the injection flow rate of the first reference nozzle.

[0022] Optionally, based on the judgment results of whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate, it is determined whether to report a urea injection volume consumption deviation fault of the two nozzles, including:

[0023] If it is determined that the injection flow rate of the first nozzle is within the threshold range of the injection flow rate of the second nozzle, and / or the injection flow rate of the second nozzle is within the threshold range of the injection flow rate of the second nozzle, then exit the urea injection quantity detection.

[0024] If it is determined that the injection flow rate of the first nozzle is not within the threshold range of the injection flow rate of the second nozzle, or the injection flow rate of the second nozzle is not within the threshold range of the injection flow rate of the second nozzle, then a urea injection consumption deviation fault of the corresponding nozzle is reported.

[0025] Optionally, the dual-nozzle-based urea injection quantity detection method further includes:

[0026] Before checking whether the urea injection volume consumption deviation fault release condition is met, determine whether the baseline nozzle injection flow rate calculation has been completed.

[0027] According to another aspect of the present invention, a dual-nozzle urea injection quantity detection device is provided, the dual-nozzle urea injection quantity detection device comprising:

[0028] The current nozzle injection flow rate acquisition module is used to simultaneously open two nozzles at a set opening degree when the fault release condition of urea injection quantity consumption deviation is detected, and to acquire the current nozzle injection flow rate of the two nozzles.

[0029] The nozzle injection flow rate acquisition module is used to perform the following actions when the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range: open two nozzles at a set opening degree respectively, and acquire the first nozzle injection flow rate and the second nozzle injection flow rate of the two nozzles respectively.

[0030] The fault reporting module is used to determine whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate, and to determine whether to report a urea injection volume consumption deviation fault of the two nozzles based on the determination results of whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate.

[0031] According to another aspect of the present invention, a vehicle is provided, the vehicle comprising:

[0032] At least one processor; and,

[0033] A memory communicatively connected to the at least one processor; wherein,

[0034] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the dual-nozzle-based urea injection quantity detection method according to any embodiment of the present invention.

[0035] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the dual-nozzle-based urea injection quantity detection method according to any embodiment of the present invention.

[0036] The technical solution of this invention involves simultaneously opening two nozzles at a set opening degree when the urea injection volume consumption deviation fault release condition is met, and acquiring the current nozzle injection flow rate of both nozzles. When the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range, the two nozzles are opened separately at the set opening degree, and the first nozzle injection flow rate and the second nozzle injection flow rate of each nozzle are acquired separately. It is then determined whether the first nozzle injection flow rate and the second nozzle injection flow rate are within the second nozzle injection flow rate threshold range, and based on the determination results, it is determined whether to report a urea injection volume consumption deviation fault for both nozzles. This invention solves the problems of long diagnostic times caused by separately detecting injection volume deviations at each nozzle in a dual-nozzle urea injection system, and the increased risk of vehicle exhaust emissions exceeding standards due to the need to stop urea injection for detection. It enables flexible detection of injection volume deviations at the nozzles of a dual-nozzle injection system, shortens the active control time of the aftertreatment system during normal operation, and reduces the risk of vehicle exhaust emissions exceeding standards.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart of a urea injection quantity detection method based on dual nozzles according to Embodiment 1 of the present invention;

[0040] Figure 2 This is a flowchart of a urea injection quantity detection method based on dual nozzles according to Embodiment 2 of the present invention;

[0041] Figure 3 This is a schematic diagram of a urea injection quantity detection device based on a dual nozzle according to Embodiment 3 of the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of a vehicle that implements the dual-nozzle urea injection quantity detection method according to an embodiment of the present invention. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] Example 1

[0046] Figure 1 This invention provides a flowchart of a method for detecting urea injection volume based on a dual-nozzle system, as described in Embodiment 1. This embodiment is applicable to diagnosing deviations in urea injection volume from dual-nozzle systems. The method can be executed by a dual-nozzle urea injection volume detection device, which can be implemented in hardware and / or software. This device can be configured in a vehicle with a dual-nozzle aftertreatment system. Figure 1 As shown, the urea injection quantity detection method based on dual nozzles includes:

[0047] S110. When the release condition for urea injection volume consumption deviation is met, both nozzles are opened simultaneously at the set opening degree, and the current nozzle injection flow rate of the two nozzles is obtained.

[0048] The release conditions for urea injection quantity consumption deviation faults include: the exhaust temperature upstream of the SCR is within the set temperature range, the ammonia storage in the SCR catalyst is within the set ammonia storage range, and the fuel injection quantity of the engine is within the set fuel injection quantity range; other parameter conditions can also be set for the urea injection quantity consumption deviation fault release conditions, and this embodiment does not impose any restrictions on them.

[0049] The exhaust temperature upstream of the SCR, the ammonia storage in the SCR catalyst, and the fuel injection quantity of the engine can be detected and collected by the corresponding sensors of the vehicle after-treatment system, or can be obtained by vehicle network communication or estimated by control algorithms based on engine operating parameters. The set temperature range, set ammonia storage range, and set fuel injection quantity range can be selected and set by those skilled in the art, and this embodiment does not impose any restrictions on them.

[0050] Before diagnosing the urea injection quantity deviation of the dual nozzle, first check whether the urea injection quantity consumption deviation fault release conditions are met. That is, check whether the exhaust temperature upstream of the SCR is within the set temperature range, whether the ammonia storage in the SCR catalyst is within the set ammonia storage range, and whether the engine fuel injection quantity is within the set fuel injection quantity range. If the exhaust temperature upstream of the SCR is within the set temperature range, the ammonia storage in the SCR catalyst is within the set ammonia storage range, and the engine fuel injection quantity is within the set fuel injection quantity range, then it is determined that the urea injection quantity consumption deviation fault release conditions are met.

[0051] When the release condition for urea injection volume consumption deviation is detected, two nozzles are opened simultaneously at a set opening degree. The set opening degree can be selected and set by those skilled in the art, and this embodiment does not impose any restrictions on it.

[0052] Furthermore, the current nozzle injection flow rate of the two nozzles is obtained, which is the sum of the urea injection amounts of the two nozzles. Urea is pressurized by a urea pump and sprayed into the post-treatment system in an atomized form using nozzles. The current nozzle injection flow rate of the two nozzles can be estimated by, but is not limited to, pump pressure, or obtained by other means. This embodiment does not impose any restrictions on this.

[0053] Based on the above, before checking whether the urea injection volume consumption deviation fault release conditions are met, it is determined whether the baseline nozzle injection flow rate calculation has been completed. The baseline nozzle injection flow rate is the benchmark value for diagnosing the urea injection volume deviation of the dual nozzles. The baseline nozzle injection flow rate is obtained during the first run of a new vehicle after it rolls off the production line, or it is obtained for the first time after each vehicle start-up. This embodiment does not impose any restrictions on this.

[0054] The specific process for calculating the reference nozzle injection flow rate is as follows: After confirming that the SCR conversion efficiency is normal and there is no ammonia leakage, the two nozzles are confirmed to be in normal condition. At this time, the flow rate of the two nozzles in normal condition is estimated. The opening degree is set to open the two nozzles simultaneously, and the reference nozzle injection flow rate of the two nozzles is obtained. The first reference nozzle injection flow rate, the second reference nozzle injection flow rate, and the third reference nozzle injection flow rate are determined based on the reference nozzle injection flow rate.

[0055] S120. When the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range, open the two nozzles with a set opening degree respectively, and obtain the first nozzle injection flow rate and the second nozzle injection flow rate of the two nozzles respectively.

[0056] This application first diagnoses the urea injection volume consumption deviation of the two nozzles simultaneously. If there is no problem, no further diagnosis is made. That is, it determines whether the current nozzle injection flow rate is within the first nozzle injection flow rate threshold range. The first nozzle injection flow rate threshold range is when the current nozzle injection flow rate is between the first reference nozzle injection flow rate and the second reference nozzle injection flow rate, and the first reference nozzle injection flow rate is less than the second reference nozzle injection flow rate.

[0057] The first reference nozzle injection flow rate and the second reference nozzle injection flow rate are both determined based on the reference nozzle injection flow rate. Optionally, the first reference nozzle injection flow rate is 75% * reference nozzle injection flow rate, and the second reference nozzle injection flow rate is 125% * reference nozzle injection flow rate. This embodiment does not impose any special restrictions on this.

[0058] Specifically, when the current nozzle injection flow rate is greater than the first reference nozzle injection flow rate and less than the second reference nozzle injection flow rate, the current nozzle injection flow rate is determined to be within the first nozzle injection flow rate threshold range; when the current nozzle injection flow rate is less than or equal to the first reference nozzle injection flow rate, or when the current nozzle injection flow rate is greater than or equal to the second reference nozzle injection flow rate, the current nozzle injection flow rate is determined to be outside the first nozzle injection flow rate threshold range.

[0059] Based on the above, if the current nozzle injection flow rate is determined to be within the first nozzle injection flow rate threshold range, then the urea injection quantity detection is exited, which means that the urea injection quantity deviation diagnosis of the aftertreatment system is normal.

[0060] When the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range, the urea injection quantity deviation of the two nozzles is diagnosed respectively, thereby shortening the active control time of the aftertreatment system under normal conditions and reducing the risk of exceeding emission standards. The specific operation is to open the two nozzles at a set opening degree respectively, and obtain the first nozzle injection flow rate and the second nozzle injection flow rate of the two nozzles respectively.

[0061] The jet flow rates of the first nozzle and the second nozzle of the two nozzles can be estimated, but are not limited to, by means of pump pressure, or obtained by other means. This embodiment does not impose any restrictions on this.

[0062] S130. Determine whether the injection flow rate of the first nozzle and the injection flow rate of the second nozzle are within the threshold range of the injection flow rate of the second nozzle, and determine whether to report the urea injection volume consumption deviation fault of the two nozzles based on the determination results of whether the injection flow rate of the first nozzle and the injection flow rate of the second nozzle are within the threshold range of the injection flow rate of the second nozzle.

[0063] The second nozzle injection flow rate threshold range is when the current nozzle injection flow rate is between the first reference nozzle injection flow rate and the third reference nozzle injection flow rate, and the third reference nozzle injection flow rate is less than the first reference nozzle injection flow rate.

[0064] The injection flow rate of the third reference nozzle is determined based on the injection flow rate of the reference nozzle. Optionally, the injection flow rate of the third reference nozzle is 25% * the injection flow rate of the reference nozzle. This embodiment does not impose any special restrictions on this.

[0065] Specifically, it is determined whether the injection flow rate of the first nozzle is greater than the injection flow rate of the third reference nozzle and less than the injection flow rate of the first reference nozzle; and it is determined whether the injection flow rate of the second nozzle is greater than the injection flow rate of the third reference nozzle and less than the injection flow rate of the first reference nozzle.

[0066] If it is determined that the injection flow rate of the first nozzle is within the threshold range of the injection flow rate of the second nozzle, or the injection flow rate of the second nozzle is within the threshold range of the injection flow rate of the second nozzle, or both the injection flow rate of the first nozzle and the injection flow rate of the second nozzle are within the threshold range of the injection flow rate of the second nozzle, then the urea injection quantity detection is terminated.

[0067] That is, if it is determined that the injection flow rate of the first nozzle is greater than the injection flow rate of the first reference nozzle and less than the injection flow rate of the second reference nozzle, or the injection flow rate of the second nozzle is greater than the injection flow rate of the first reference nozzle and less than the injection flow rate of the second reference nozzle, or both the injection flow rate of the first nozzle and the injection flow rate of the second nozzle are greater than the injection flow rate of the first reference nozzle and less than the injection flow rate of the second reference nozzle, then the urea injection quantity detection is terminated.

[0068] If it is determined that the injection flow rate of the first nozzle is not within the threshold range of the injection flow rate of the second nozzle, or the injection flow rate of the second nozzle is not within the threshold range of the injection flow rate of the second nozzle, then a urea injection consumption deviation fault of the corresponding nozzle is reported.

[0069] That is, if it is determined that the injection flow rate of the first nozzle is less than or equal to the injection flow rate of the first reference nozzle or greater than or equal to the injection flow rate of the second reference nozzle, or the injection flow rate of the second nozzle is less than or equal to the injection flow rate of the first reference nozzle or greater than or equal to the injection flow rate of the second reference nozzle, then a urea injection consumption deviation fault of the corresponding nozzle is reported.

[0070] Furthermore, if it is determined that the injection flow rate of the first nozzle is not within the threshold range of the injection flow rate of the second nozzle, that is, the injection flow rate of the first nozzle is less than or equal to the injection flow rate of the first reference nozzle or greater than or equal to the injection flow rate of the second reference nozzle, then a urea injection consumption deviation fault of the first nozzle is reported.

[0071] If it is determined that the injection flow rate of the second nozzle is not within the threshold range of the second nozzle injection flow rate, that is, the injection flow rate of the second nozzle is less than or equal to the injection flow rate of the first reference nozzle or greater than or equal to the injection flow rate of the second reference nozzle, then a urea injection consumption deviation fault of the second nozzle is reported.

[0072] The technical solution of this invention involves simultaneously opening two nozzles at a set opening degree when the urea injection volume consumption deviation fault release condition is met, and acquiring the current nozzle injection flow rate of both nozzles. When the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range, the two nozzles are opened separately at the set opening degree, and the first nozzle injection flow rate and the second nozzle injection flow rate of each nozzle are acquired separately. It is then determined whether the first nozzle injection flow rate and the second nozzle injection flow rate are within the second nozzle injection flow rate threshold range, and based on the determination results, it is determined whether to report a urea injection volume consumption deviation fault for both nozzles. This invention solves the problems of long diagnostic times caused by separately detecting injection volume deviations at each nozzle in a dual-nozzle urea injection system, and the increased risk of vehicle exhaust emissions exceeding standards due to the need to stop urea injection for detection. It enables flexible detection of injection volume deviations at the nozzles of a dual-nozzle injection system, shortens the active control time of the aftertreatment system during normal operation, and reduces the risk of vehicle exhaust emissions exceeding standards.

[0073] Example 2

[0074] Figure 2This is a flowchart of a urea injection quantity detection method based on a dual-nozzle system provided in Embodiment 2 of the present invention. This embodiment provides an optional implementation method based on the above embodiments. For example... Figure 2 As shown, the urea injection quantity detection method based on dual nozzles includes:

[0075] S210. Determine whether the calculation of the reference nozzle injection flow rate has been completed. If yes, proceed to step S220; otherwise, proceed to step S211.

[0076] S211. Determine whether the SCR conversion efficiency is normal and whether there is ammonia leakage. If yes, proceed to step S211; otherwise, proceed to step S212.

[0077] It is understood that whether the SCR conversion efficiency is normal and whether there is no ammonia leakage can be detected by existing means in the post-treatment system, and this embodiment does not impose any special restrictions on this.

[0078] S212. Confirm that both nozzles are in normal condition, then proceed to step S213.

[0079] S213. Simultaneously open two nozzles at a set opening degree and obtain the reference nozzle injection flow rate of the two nozzles. Determine the first reference nozzle injection flow rate, the second reference nozzle injection flow rate, and the third reference nozzle injection flow rate based on the reference nozzle injection flow rate, and execute step S220.

[0080] Urea is pressurized by a urea pump and sprayed into the post-treatment system in an atomized form using a nozzle. The reference nozzle spray flow rate is the sum of the urea spray rates of the two nozzles at this time. The reference nozzle spray flow rate can be estimated by pump pressure or obtained by other means, but this embodiment does not impose any restrictions on it.

[0081] S220. Check whether the urea injection volume consumption deviation fault release condition is met. If yes, proceed to step S221; otherwise, proceed to step S220.

[0082] S221. Simultaneously open two nozzles at a set opening degree, and obtain the current nozzle spray flow rate of the two nozzles, then execute step S222.

[0083] S222. Determine whether the current nozzle injection flow rate is greater than the first reference nozzle injection flow rate and less than the second reference nozzle injection flow rate. If yes, proceed to step S223; otherwise, proceed to steps S230 and S240.

[0084] For example, taking a first reference nozzle injection flow rate of 75% * reference nozzle injection flow rate and a second reference nozzle injection flow rate of 125% * reference nozzle injection flow rate as an example, it is determined whether the current nozzle injection flow rate is greater than 75% * reference nozzle injection flow rate and less than 125% * reference nozzle injection flow rate.

[0085] S223, Exit urea injection volume detection.

[0086] S230. Open the first nozzle with a set opening degree and obtain the first nozzle spray flow rate of the first nozzle. Then execute step S231.

[0087] S231. Determine whether the injection flow rate of the first nozzle is greater than the injection flow rate of the third reference nozzle and less than the injection flow rate of the first reference nozzle. If yes, proceed to step S250; otherwise, proceed to step S232.

[0088] For example, taking the third reference nozzle injection flow rate as 25% * reference nozzle injection flow rate as an example, determine whether the current nozzle injection flow rate is greater than 25% * reference nozzle injection flow rate and less than 75% * reference nozzle injection flow rate.

[0089] S250, Exit urea injection volume detection.

[0090] S232, Report a urea injection volume consumption deviation fault in the first nozzle.

[0091] S240. Open the second nozzle with a set opening degree and obtain the second nozzle spray flow rate of the second nozzle. Execute step S241.

[0092] S241. Determine whether the injection flow rate of the second nozzle is greater than the injection flow rate of the third reference nozzle and less than the injection flow rate of the second reference nozzle. If yes, proceed to step S250; otherwise, proceed to step S242.

[0093] S250, Exit urea injection volume detection.

[0094] S242, Report a urea injection volume consumption deviation fault in the second nozzle.

[0095] The technical solution of this invention involves simultaneously activating the flow reference values ​​of two normal nozzles in the corresponding post-treatment system when the SCR conversion efficiency of the post-treatment system is normal and there is no ammonia leakage. Furthermore, the two nozzles are activated simultaneously to evaluate the flow rate at the current stage. If the flow deviation is within the normal range, the diagnosis ends. If the flow deviation exceeds the limit, the flow rate of the two nozzles is evaluated separately to locate the nozzle with a large deviation in urea injection volume consumption.

[0096] Example 3

[0097] Figure 3 This is a schematic diagram of a urea injection quantity detection device based on a dual-nozzle according to Embodiment 3 of the present invention. Figure 3 As shown, the urea injection volume detection device based on dual nozzles includes:

[0098] The current nozzle injection flow acquisition module 310 is used to perform the following actions when the urea injection volume consumption deviation fault release condition is detected, to simultaneously open two nozzles at a set opening degree, and to acquire the current nozzle injection flow of the two nozzles.

[0099] The nozzle injection flow rate acquisition module 320 is used to perform the following actions when the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range: opening two nozzles at a set opening degree and acquiring the first nozzle injection flow rate and the second nozzle injection flow rate of the two nozzles respectively.

[0100] The fault reporting module 330 is used to perform the following actions: determine whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate, and determine whether to report a urea injection volume consumption deviation fault of the two nozzles based on the determination results of whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate.

[0101] Optionally, the urea injection quantity consumption deviation fault release conditions include: the exhaust temperature upstream of the SCR is within the set temperature range, the ammonia storage in the SCR catalyst is within the set ammonia storage range, and the engine fuel injection quantity is within the set fuel injection quantity range.

[0102] The fault release condition for urea injection volume consumption deviation was detected and is specifically used for:

[0103] When the upstream exhaust temperature of the SCR is detected to be within the set temperature range, the ammonia storage of the SCR catalyst is within the set ammonia storage range, and the fuel injection quantity of the engine is within the set fuel injection quantity range, it is determined that the urea injection quantity consumption deviation fault release condition is met.

[0104] Optionally, the dual-nozzle-based urea injection quantity detection device further includes:

[0105] The nozzle status judgment module is used to determine that the status of the two nozzles is normal after confirming that the SCR conversion efficiency is normal and there is no ammonia leakage.

[0106] The reference nozzle injection flow rate determination module is used to simultaneously open two nozzles at a set opening degree, acquire the reference nozzle injection flow rates of the two nozzles, and determine the first reference nozzle injection flow rate, the second reference nozzle injection flow rate, and the third reference nozzle injection flow rate based on the reference nozzle injection flow rates.

[0107] Optionally, the first nozzle injection flow rate threshold range is when the current nozzle injection flow rate is between the first reference nozzle injection flow rate and the second reference nozzle injection flow rate, wherein the first reference nozzle injection flow rate is less than the second reference nozzle injection flow rate;

[0108] The current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range, specifically:

[0109] If the current nozzle injection flow rate is less than or equal to the first reference nozzle injection flow rate, or if the current nozzle injection flow rate is greater than or equal to the second reference nozzle injection flow rate, then it is determined that the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range.

[0110] Optionally, the second nozzle injection flow rate threshold range is when the current nozzle injection flow rate is between the first reference nozzle injection flow rate and the third reference nozzle injection flow rate, wherein the third reference nozzle injection flow rate is less than the first reference nozzle injection flow rate;

[0111] Specifically, it is determined whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate.

[0112] Determine whether the injection flow rate of the first nozzle is greater than the injection flow rate of the third reference nozzle, and less than the injection flow rate of the first reference nozzle; and,

[0113] Determine whether the injection flow rate of the second nozzle is greater than the injection flow rate of the third reference nozzle and less than the injection flow rate of the first reference nozzle.

[0114] Optionally, based on the result of determining whether the flow rate is within the threshold range of the second nozzle, it is determined whether to report a urea injection volume consumption deviation fault between the two nozzles, specifically:

[0115] If it is determined that the injection flow rate of the first nozzle is within the threshold range of the injection flow rate of the second nozzle, and / or the injection flow rate of the second nozzle is within the threshold range of the injection flow rate of the second nozzle, then exit the urea injection quantity detection.

[0116] If it is determined that the injection flow rate of the first nozzle is not within the threshold range of the injection flow rate of the second nozzle, or the injection flow rate of the second nozzle is not within the threshold range of the injection flow rate of the second nozzle, then a urea injection consumption deviation fault of the corresponding nozzle is reported.

[0117] Optionally, the dual-nozzle-based urea injection quantity detection device further includes:

[0118] The reference nozzle injection flow calculation completion module is used to determine whether the reference nozzle injection flow calculation has been completed before checking whether the urea injection volume consumption deviation fault release condition is met.

[0119] The dual-nozzle urea injection quantity detection device provided in this embodiment of the invention can execute the dual-nozzle urea injection quantity detection method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the dual-nozzle urea injection quantity detection method.

[0120] Example 4

[0121] Figure 4 A schematic diagram of a vehicle 410, which can be used to implement embodiments of the present invention, is shown. The vehicle includes components representing various forms of digital computers, such as laptops, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The vehicle may also include components representing various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0122] like Figure 4 As shown, vehicle 410 includes at least one processor 411 and a memory, such as read-only memory (ROM 412) or random access memory (RAM 413), communicatively connected to the at least one processor 411. The memory stores computer programs executable by the at least one processor. The processor 411 can perform various appropriate actions and processes based on the computer program stored in the read-only memory (ROM 412) or loaded from storage unit 418 into the random access memory (RAM 413). The RAM 413 can also store various programs and data required for the operation of vehicle 410. The processor 411, ROM 412, and RAM 413 are interconnected via bus 414. I / O (input / output) interface 415 is also connected to bus 414.

[0123] Multiple components in vehicle 410 are connected to I / O interface 415, including: input unit 416, such as keyboard, mouse, etc.; output unit 417, such as various types of displays, speakers, etc.; storage unit 418, such as disk, optical disk, etc.; and communication unit 419, such as network card, modem, wireless transceiver, etc. Communication unit 419 allows vehicle 410 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0124] Processor 411 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 411 include, but are not limited to, central processing unit (CPU), graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 411 performs the various methods and processes described above, such as the urea injection quantity detection method based on dual nozzles.

[0125] In some embodiments, the dual-nozzle-based urea injection quantity detection method can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 418. In some embodiments, part or all of the computer program can be loaded and / or installed on vehicle 410 via ROM 412 and / or communication unit 419. When the computer program is loaded into RAM 413 and executed by processor 411, one or more steps of the dual-nozzle-based urea injection quantity detection method described above can be performed. Alternatively, in other embodiments, processor 411 can be configured to perform the dual-nozzle-based urea injection quantity detection method by any other suitable means (e.g., by means of firmware).

[0126] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0127] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0128] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0129] To provide interaction with the user, the systems and technologies described herein can be implemented in a vehicle having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the vehicle. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0130] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0131] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0132] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0133] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting urea injection volume based on dual nozzles, characterized in that, include: When the release condition for urea injection volume consumption deviation is met, both nozzles are opened simultaneously at the set opening degree, and the current nozzle injection flow rate of the two nozzles is obtained. When the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range, two nozzles are opened with a set opening degree, and the first nozzle injection flow rate and the second nozzle injection flow rate of the two nozzles are obtained respectively. Determine whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate, and determine whether to report a urea injection volume consumption deviation fault of the two nozzles based on the determination results of whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate.

2. The method for detecting urea injection volume based on dual nozzles according to claim 1, characterized in that, The conditions for releasing the urea injection quantity consumption deviation fault include: the exhaust temperature upstream of the SCR is within the set temperature range, the ammonia storage in the SCR catalyst is within the set ammonia storage range, and the fuel injection quantity of the engine is within the set fuel injection quantity range. The fault release conditions for urea injection volume consumption deviation were detected, including: When the upstream exhaust temperature of the SCR is detected to be within the set temperature range, the ammonia storage of the SCR catalyst is within the set ammonia storage range, and the fuel injection quantity of the engine is within the set fuel injection quantity range, it is determined that the urea injection quantity consumption deviation fault release condition is met.

3. The method for detecting urea injection volume based on dual nozzles according to claim 1, characterized in that, The dual-nozzle-based urea injection quantity detection method further includes: After confirming that the SCR conversion efficiency was normal and there was no ammonia leakage, it was determined that both nozzles were in normal condition. Two nozzles are opened simultaneously at a set opening degree, and the reference nozzle injection flow rates of the two nozzles are obtained. The first reference nozzle injection flow rate, the second reference nozzle injection flow rate, and the third reference nozzle injection flow rate are determined based on the reference nozzle injection flow rates.

4. The method for detecting urea injection volume based on dual nozzles according to claim 3, characterized in that, The first nozzle injection flow rate threshold range is when the current nozzle injection flow rate is between the first reference nozzle injection flow rate and the second reference nozzle injection flow rate, and the first reference nozzle injection flow rate is less than the second reference nozzle injection flow rate; The statement that the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range includes: If the current nozzle injection flow rate is less than or equal to the first reference nozzle injection flow rate, or if the current nozzle injection flow rate is greater than or equal to the second reference nozzle injection flow rate, then it is determined that the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range.

5. The method for detecting urea injection volume based on dual nozzles according to claim 4, characterized in that, The second nozzle injection flow rate threshold range is when the current nozzle injection flow rate is between the first reference nozzle injection flow rate and the third reference nozzle injection flow rate, and the third reference nozzle injection flow rate is less than the first reference nozzle injection flow rate; Determine whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate, including: Determine whether the injection flow rate of the first nozzle is greater than the injection flow rate of the third reference nozzle and less than the injection flow rate of the first reference nozzle; as well as, Determine whether the injection flow rate of the second nozzle is greater than the injection flow rate of the third reference nozzle and less than the injection flow rate of the first reference nozzle.

6. The method for detecting urea injection volume based on dual nozzles according to claim 1, characterized in that, Based on the results of determining whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate, it is determined whether to report a urea injection volume consumption deviation fault for the two nozzles, including: If it is determined that the injection flow rate of the first nozzle is within the threshold range of the injection flow rate of the second nozzle, and / or the injection flow rate of the second nozzle is within the threshold range of the injection flow rate of the second nozzle, then exit the urea injection quantity detection. If it is determined that the injection flow rate of the first nozzle is not within the threshold range of the injection flow rate of the second nozzle, or the injection flow rate of the second nozzle is not within the threshold range of the injection flow rate of the second nozzle, then a urea injection consumption deviation fault of the corresponding nozzle is reported.

7. The method for detecting urea injection volume based on dual nozzles according to claim 3, characterized in that, The dual-nozzle-based urea injection quantity detection method further includes: Before checking whether the urea injection volume consumption deviation fault release condition is met, determine whether the baseline nozzle injection flow rate calculation has been completed.

8. A urea injection quantity detection device based on dual nozzles, characterized in that, include: The current nozzle injection flow rate acquisition module is used to simultaneously open two nozzles at a set opening degree when the fault release condition of urea injection quantity consumption deviation is detected, and to acquire the current nozzle injection flow rate of the two nozzles. The nozzle injection flow rate acquisition module is used to perform the following actions when the current nozzle injection flow rate is not within the first nozzle injection flow rate threshold range: open two nozzles at a set opening degree respectively, and acquire the first nozzle injection flow rate and the second nozzle injection flow rate of the two nozzles respectively. The fault reporting module is used to determine whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate, and to determine whether to report a urea injection volume consumption deviation fault of the two nozzles based on the determination results of whether the injection flow rates of the first nozzle and the second nozzle are within the threshold range of the second nozzle injection flow rate.

9. A vehicle, characterized in that, The vehicles include: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the dual-nozzle-based urea injection quantity detection method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the dual-nozzle-based urea injection quantity detection method according to any one of claims 1-7.

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