Urea range calculation and reminder method

Abstract

The application discloses a kind of urea endurance mileage calculation and reminding method, the main design concept of the application is in, after reading current urea liquid level value, whether it is cold start according to multidimensional factor judgment, if it is determined that cold start, whether there is urea icing risk based on water temperature and ambient temperature judgment;After judging that there is icing risk, based on last driving cycle urea liquid level value, determine target urea liquid level value and urea residual mass, utilize the urea residual mass and the average urea consumption of preset, obtain current urea residual mileage information, and according to the comparison relationship of the current urea residual mileage information and the several endurance mileage threshold of preset, the corresponding residual mileage display mode is decided.The application can effectively avoid the problem that driver cannot correctly handle due to inaccurate traditional calculation mode, unreasonable reminding, and finally vehicle cannot start.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle exhaust emission, in particular to a urea endurance mileage calculation and reminding method. BACKGROUND

[0002] Diesel engines have excellent economy and power, and have been widely used in the automotive and engineering machinery industries. At present, light and heavy diesel engines have adopted the selective catalytic reduction (SCR) technology route, which is a treatment process for NOx in diesel vehicle exhaust emission, using urea solution as a reducing agent to selectively reduce nitrogen oxides to nitrogen and water under the action of a catalyst in an oxygen-rich environment.

[0003] According to industry requirements, when the reaction agent storage level in the urea storage tank can still be used for the average endurance mileage of a full-tank fuel vehicle, the driver induction system needs to be activated. After the induction system is activated, the following four modes are implemented:

[0004] 1. "Limited number of restarts" mode, i.e., the engine cannot be restarted after a certain period of operation or a certain distance of travel, and when the reaction agent is empty or the distance traveled exceeds the endurance mileage of a full-tank fuel vehicle (whichever comes first), the engine should be immediately prevented from restarting.

[0005] 2. "No start after refueling" mode after the induction system is activated, i.e., the engine cannot be started after refueling the vehicle.

[0006] 3. "Fuel lock" mode after the induction system is activated, i.e., the vehicle is prevented from refueling by locking the fuel filling system.

[0007] 4. "Performance limitation" mode after the induction system is activated, i.e., speed limitation. This limitation should gradually be integrated into travel or after the engine starts, and should be able to prevent subsequent engine restarts, for example, the vehicle speed should not exceed 50 km / h. When the reaction agent is empty or the distance traveled exceeds the endurance mileage of a full-tank fuel vehicle (whichever comes first), the engine should be immediately prevented from restarting.

[0008] The above treatment methods ultimately result in the prohibition of restarting the engine, therefore, the calculation and reminding method of urea remaining mileage is particularly important.

[0009] The current calculation method is to calculate the remaining mileage only based on the remaining amount of urea (from the liquid level reading) divided by the urea consumption rate. The corresponding reminding method includes: reminding only the urea capacity percentage in the instrument; or, reminding the urea remaining percentage and the urea remaining mileage.

[0010] It can be seen that the existing calculation method is too simple and does not consider special cases, for example, after icing in winter, because the urea liquid level sensor uses ultrasonic principle, it cannot effectively detect the liquid level signal, at this time the liquid level will be displayed as 0 or a liquid level value lower than the actual liquid level, and the remaining mileage calculated is inaccurate, which misfires the induction system and causes the vehicle to be unable to start.

[0011] For the reminding method, there are also deficiencies:

[0012] (1) only display urea percentage

[0013] The reminding effect is not obvious, which cannot effectively prompt the driver about the remaining urea range, leading to being ignored by the driver, and further causing the vehicle to be unable to start after the urea is consumed;

[0014] (2) remind urea remaining percentage and urea remaining mileage

[0015] The urea consumption rate is different from the fuel consumption rate, and the urea consumption is more slow, according to the real vehicle verification, the urea range of a tank can reach tens of thousands of kilometers, therefore, based on different driving habits and different driving conditions, the urea consumption rate will be different, leading to a big difference in the displayed range of different vehicles; in addition, if the urea consumption rate is different under different driving conditions for the same vehicle, the displayed remaining mileage will not change or change irregularly, which causes trouble to the driver. SUMMARY

[0016] In view of the above, the present application aims to provide a urea range calculation and reminding method to solve the aforementioned technical problems.

[0017] The technical solution adopted by the present application is as follows:

[0018] The present application provides a urea range calculation and reminding method, which comprises:

[0019] After reading the current urea liquid level value, it is judged whether it is a cold start according to multiple factors;

[0020] If it is determined to be a cold start, it is judged whether there is a risk of urea icing based on the water temperature and the ambient temperature;

[0021] After judging that there is a risk of icing, the target urea liquid level value and the urea remaining mass are determined based on the last driving cycle urea liquid level value;

[0022] The current urea remaining mileage information is obtained by using the urea remaining mass and the preset average urea consumption, and the current urea remaining mileage information is updated during driving;

[0023] According to the comparison relationship between the current urea remaining mileage information and a plurality of preset threshold values of the cruising range, a corresponding remaining mileage display mode is determined.

[0024] In at least one possible implementation, the determining of the target urea liquid level value based on the urea liquid level value of the previous driving cycle comprises:

[0025] calculating a difference between the current urea liquid level value and the urea liquid level value of the previous driving cycle;

[0026] if the difference exceeds a preset deviation threshold value, taking the urea liquid level value of the previous driving cycle as the target urea liquid level value;

[0027] if the difference does not exceed the preset deviation threshold value, taking the current urea liquid level value as the target urea liquid level value.

[0028] In at least one possible implementation, the determining of the corresponding remaining mileage display mode comprises:

[0029] if the current urea remaining mileage information > a first threshold value, displaying a preset default value of the cruising range;

[0030] if a second threshold value ≤ the current urea remaining mileage information ≤ the first threshold value, displaying the current urea remaining mileage information calculated periodically;

[0031] if the current urea remaining mileage information < the second threshold value, displaying the remaining mileage according to the actual driving mileage of the vehicle.

[0032] In at least one possible implementation, the display mode of the remaining mileage further comprises: dynamically adjusting the frequency of display update according to the numerical change of the remaining mileage.

[0033] In at least one possible implementation, the display mode of the remaining mileage further comprises: in the process of displaying the remaining mileage calculated by urea, only allowing the displayed remaining mileage to increase when the following two working conditions occur: after refueling urea, or without refueling urea and the volume detection value exceeds a predetermined volume limit.

[0034] In at least one possible implementation, the determining whether it is a cold start according to the plurality of factors comprises: determining whether it is a cold start based on the parking duration, the exhaust temperature, the temperature after intercooling and the ambient temperature.

[0035] In at least one possible implementation, if the parking duration exceeds a predetermined time threshold value, and the absolute values of the differences between the exhaust temperature, the temperature after intercooling and the ambient temperature are all less than a predetermined temperature difference threshold value, it is determined to belong to the cold start.

[0036] In at least one possible implementation, the method further comprises: if it is determined that it is not a cold start or there is no risk of urea icing, then the current urea remaining mileage information is calculated using the current urea level value.

[0037] Compared with the prior art, the main design concept of the present application is that after reading the current urea level value, it is determined whether it is a cold start according to multi-dimensional factors, and if it is determined to be a cold start, it is determined whether there is a risk of urea icing based on the water temperature and the ambient temperature; after it is determined that there is a risk of icing, the target urea level value and the urea remaining mass are determined based on the last driving cycle urea level value, the current urea remaining mileage information is obtained using the urea remaining mass and the preset average urea consumption, and the corresponding remaining mileage display mode is determined according to the comparison relationship between the current urea remaining mileage information and the preset several endurance mileage thresholds. The present application can effectively avoid the problem that the traditional calculation method is inaccurate and the driver cannot correctly handle the unreasonable reminder, so that the vehicle cannot start. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to make the object, technical scheme and advantages of the present application clearer, the present application will be further described below with reference to the drawings, in which:

[0039] Figure 1 The flowchart of the urea endurance mileage calculation and reminding method provided by the embodiment of the present application is shown. DETAILED DESCRIPTION

[0040] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be interpreted as a limitation on the present application.

[0041] The present application proposes an embodiment of a urea endurance mileage calculation and reminding method, specifically as shown in Figure 1 , which includes:

[0042] Step S1, after reading the current urea level value, it is determined whether it is a cold start according to multi-dimensional factors;

[0043] Step S2, if it is determined to be a cold start, it is determined whether there is a risk of urea icing based on the water temperature and the ambient temperature (it can be understood that the water temperature and the ambient temperature are less than 0°);

[0044] Step S3, after it is determined that there is a risk of icing, the target urea level value and the urea remaining mass are determined based on the last driving cycle urea level value;

[0045] Step S4, using the urea remaining mass and the preset average urea consumption, obtaining the current urea remaining range information (i.e. the cruising range based on the urea data, which can refer to the existing calculation method), and updating the current urea remaining range information during driving;

[0046] Step S5, according to the comparison relationship between the current urea remaining range information and the preset different endurance range threshold, deciding the corresponding remaining range display mode.

[0047] As to the judgment of cold start according to multi-dimensional factors, specifically, it includes judging whether it is a cold start based on parking time, exhaust temperature, intercooling temperature and ambient temperature. In actual operation, if the parking time is more than 8 hours, and the absolute value of the difference between any two of the above-mentioned three temperatures is less than 5K, it is determined that the current belongs to cold start.

[0048] In addition, the implementation process of determining the target urea level value based on the last driving cycle urea level value can include the following:

[0049] Obtaining the difference between the current urea level value and the last driving cycle urea level value;

[0050] If the difference exceeds the preset deviation threshold (such as 10%), it is determined that the current urea icing phenomenon occurs, and the last driving cycle urea level value is taken as the target urea level value;

[0051] If the difference does not exceed the preset deviation threshold, it is determined that the current urea icing phenomenon does not occur, and the current urea level value is taken as the target urea level value.

[0052] In some preferred embodiments, as to the decision of the corresponding remaining range display mode, it can mean that if the current urea remaining range information > first threshold (such as 2400km), the instrument can display a preset endurance range, such as "2400+" during driving;

[0053] If the second threshold (such as 700km) ≤ the current urea remaining range information ≤ the first threshold, the current urea remaining range information calculated periodically is displayed during driving;

[0054] If the current urea remaining range information < the second threshold, the actual driving range of the vehicle is displayed.

[0055] That is, the application in the preferred embodiment presents the remaining mileage to the user by including two calculation modes: first, when the calculated urea remaining mileage is high, only a certain default value is displayed to avoid user confusion caused by irregular mileage changes; second, when the calculated urea remaining mileage is low, the actual driving mileage is directly used for difference calculation instead of using the aforementioned urea algorithm, and only when the urea remaining mileage is within a certain range, the calculation result of the aforementioned urea mileage algorithm is used.

[0056] Regarding the display strategy of the remaining mileage, two points can be added here: first, preferably, the remaining mileage value presented in the instrument is not updated in real time, but the display update frequency is dynamically adjusted according to the value change of the remaining mileage, thereby improving the reminding effect and experience. The following table is an example:

[0057] Serial number Remaining distance (km) Display update frequency 1 1000-2400 km 100 km update once 2 500-1000 km 50 km update once 3 150-500 km 10 km update once 4 50-150 km 5 km update once 5 < 50 km 1 km update once

[0058] Second, ideally, the display of the remaining mileage should present a monotonically decreasing rule, but fluctuations may occur in practice. In order to avoid such display fluctuations, in some preferred embodiments, during the display of the remaining mileage calculated by urea, the displayed remaining mileage is only allowed to increase under the following two working conditions: after urea is added, or the volume exceeds a certain limit (such as 1.5L) without urea being added. Under other working conditions, the display effect of the remaining mileage is kept decreasing or unchanged.

[0059] Finally, under the premise of the above embodiments, the method further comprises: if it is judged that it is not a cold start or there is no risk of urea icing, the current urea level value is used to calculate the current urea remaining mileage information.

[0060] In summary, the main design concept of the application is that after reading the current urea level value, it is determined whether it is a cold start according to multiple factors. If it is determined to be a cold start, it is determined whether there is a risk of urea icing based on the water temperature and the ambient temperature. After it is determined that there is a risk of icing, the target urea level value and the urea remaining mass are determined based on the last driving cycle urea level value. The current urea remaining mileage information is obtained using the urea remaining mass and the preset average urea consumption, and the corresponding remaining mileage display mode is determined according to the comparison relationship between the current urea remaining mileage information and the preset several endurance mileage thresholds. The application can effectively avoid the problem that the traditional calculation method is inaccurate and the driver cannot correctly handle the problem caused by unreasonable reminders, and the vehicle cannot start.

[0061] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. The character " / " generally represents that the associated objects before and after it are in an "or" relationship. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, and c can be single or multiple.

[0062] The above embodiments according to the drawings illustrate the structure, features and effects of the present application, but the above are only preferred embodiments of the present application, and it should be noted that the technical features involved in the above embodiments and preferred modes can be reasonably combined and matched into various equivalent schemes by those skilled in the art without departing from or changing the design idea and technical effects of the present application. Therefore, the present application is not limited by the drawings shown in the embodiments, and any changes or modifications made in accordance with the concept of the present application, or equivalent embodiments with equivalent changes, shall be within the scope of the present application.

Claims

1. A method of urea range calculation and reminder, characterized in that, The method comprises the following steps: After reading the current urea liquid level value, it is determined whether it is a cold start according to multi-dimensional factors; If it is determined to be a cold start, it is determined whether there is a risk of urea icing based on the water temperature and the ambient temperature; After determining that there is a risk of icing, the target urea liquid level value and the remaining mass of urea are determined based on the urea liquid level value of the last driving cycle; The current urea remaining mileage information is calculated using the remaining mass of urea and the preset average urea consumption, and the current urea remaining mileage information is updated during driving; According to the comparison relationship between the current urea remaining mileage information and the preset several endurance mileage thresholds, the corresponding remaining mileage display mode is determined, including: if the current urea remaining mileage information > the first threshold value, the preset endurance mileage default value is displayed; If the second threshold value ≤ the current urea remaining mileage information ≤ the first threshold value, the current urea remaining mileage information calculated periodically is displayed; If the current urea remaining mileage information < the second threshold value, the remaining mileage is displayed according to the actual driving mileage of the vehicle.

2. The urea range calculation and alert method of claim 1, wherein, The target urea liquid level value is determined based on the urea liquid level value of the last driving cycle, which comprises the following steps: The difference between the current urea liquid level value and the urea liquid level value of the last driving cycle is calculated; If the difference exceeds the preset deviation threshold value, the urea liquid level value of the last driving cycle is taken as the target urea liquid level value; If the difference does not exceed the preset deviation threshold value, the current urea liquid level value is taken as the target urea liquid level value.

3. The urea range calculation and alert method of claim 1, wherein, The display mode of the remaining mileage further comprises: dynamically adjusting the frequency of display update according to the numerical change of the remaining mileage.

4. The urea range calculation and alert method of claim 1, wherein, The display mode of the remaining mileage further comprises: during the display of the remaining mileage calculated by urea, only when the following two working conditions occur, the displayed remaining mileage is increased: after refueling urea, or without refueling urea and the volume detection value exceeds the predetermined volume limit.

5. The urea range calculation and alert method of claim 1, wherein, The determination of whether it is a cold start according to multi-dimensional factors comprises: determining whether it is a cold start based on the parking time, the exhaust temperature, the temperature after intercooling and the ambient temperature.

6. The urea range calculation and alert method of claim 5, wherein, If the parking time exceeds the predetermined time threshold value, and the absolute values of the differences between the exhaust temperature, the temperature after intercooling and the ambient temperature are all less than the predetermined temperature difference threshold value, it is determined to be a cold start.

7. The urea range calculation and alert method according to any one of claims 1 to 6, characterized in that The method further comprises: if it is determined to be a non-cold start or there is no risk of urea icing, the current urea liquid level value is used to calculate the current urea remaining mileage information.

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