Urea box design method and automobile design method

Abstract

The invention provides a urea box design method and an automobile design method.The urea box design method comprises the steps that an opening is formed in the bottom side of a urea box, a solution pump enters the interior of the urea box through the opening part, and the interior of the urea box comprises a first liquid level line, a second liquid level line, a first area, a second area and a third area; the first area is a space between a first liquid level line and the top of the urea box, and the demarcation of the first liquid level line is determined according to the volume of the second area; the second area is a space between the first liquid level line and the second liquid level line, and the volume of the second area is determined according to the vehicle driving speed, the driving altitude and the endurance mileage requirement; the third area is a space between a second liquid level line and the bottom of the urea box, and the height of the second liquid level line is the height of the part, entering the urea box, of the solution pump. By means of the method, the vehicle urea box better meeting the actual requirement can be designed more accurately.

Description

Technical Field

[0001] The present invention relates to the field of automobiles, and in particular to a design method of a urea tank and a design method of an automobile. Background Art

[0002] The main pollutants in automobile exhaust are nitrogen oxides and particulates, of which nitrogen oxides can be reduced by 32.5% automotive urea aqueous solution. Urea aqueous solution is usually stored in urea tanks. If there is insufficient urea in the urea tank, it will not only affect the effect of automobile exhaust treatment, but also limit the vehicle power, affecting the customer's car experience.

[0003] Since the purchase cost and unit mileage consumption of urea are much lower than fuel, most manufacturers only consider the layout space of the entire vehicle when designing the volume of the urea tank, and do not design the urea tank according to the customer's actual vehicle usage environment. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a design method of a urea tank and a vehicle design method, so as to more accurately design a vehicle urea tank that better meets actual needs.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution:

[0006] According to a first aspect of the present invention, the present invention provides a design method for a urea tank, wherein the bottom side of the urea tank is open, a solution pump enters the interior of the urea tank through the opening, and the interior of the urea tank includes a first liquid level line, a second liquid level line, a first area, a second area, and a third area;

[0007] The first area is the space between the first liquid level line and the top of the urea tank, which is used to prevent the urea solution from freezing and expanding to damage the urea tank. The first liquid level line is determined according to the volume of the second area.

[0008] The second area is the space between the first liquid level line and the second liquid level line, and the volume of the second area is determined according to the vehicle's driving speed, driving altitude, and cruising range requirements;

[0009] The third area is a space between the second liquid level line and the bottom of the urea tank. The height of the second liquid level line is the height of the portion where the solution pump enters the urea tank.

[0010] Preferably, the first liquid level line is also determined according to the volume of the third region and the volume of the portion of the urea pump entering the urea tank.

[0011] Preferably, the first liquid level line should be delineated after the design of the second area and the third area is completed.

[0012] Preferably, an opening connected to the outside of the urea tank is provided on the side of the urea tank at the same height as the first liquid level line.

[0013] Preferably, the volume of the second region is determined according to the following steps:

[0014] Different vehicle types are preset according to the vehicle's speed range, altitude range, and mileage range;

[0015] Presetting the corresponding volumes of the second area for different vehicle types;

[0016] in:

[0017] The vehicle speed range is determined based on vehicle performance, legal speed, and vehicle speed big data analysis results;

[0018] The driving altitude range is determined according to legal regulations;

[0019] The range of driving range is determined based on the results of user demand surveys.

[0020] According to a second aspect of the present invention, there is provided a method for designing an automobile, comprising the method for designing a urea tank as described in any one of the above.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention not only considers the layout space of the whole vehicle in the design of the urea tank, but also comprehensively considers various factors such as the freezing expansion of the urea solution in a low-temperature environment, the vehicle use environment and vehicle use requirements, and the physical structure of the urea tank, so that a vehicle urea tank that better meets actual needs can be designed more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0024] Figure 1 It is a schematic diagram of the structure of the urea tank described in Examples 1 and 2 of the present invention.

[0025] The figure shows:

[0026] 1-Urea tank

[0027] 2-Solution pump

[0028] 11-First Area

[0029] 12-Second Area

[0030] 13-Third Area DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0033] Example 1

[0034] Most domestic manufacturers only consider the layout space of the vehicle when designing the volume of the urea tank, and do not design the urea tank according to the actual vehicle usage environment of the customer. This embodiment will provide a design method for a urea tank for the volume design of urea tanks of different vehicle models.

[0035] like Figure 1 As shown, the urea tank 1 designed by the method provided in this embodiment has a rectangular appearance as a whole, with an opening at the bottom, and the solution pump 2 enters the interior of the urea tank 1 through the opening. The dotted line a and the dotted line b in the figure are both liquid level lines, which are used to mark the liquid level height of the urea solution in the urea tank 1. As for the design of the interior of the urea tank 1, it includes a first area 11, a second area 12, and a third area 13.

[0036] The design of the first area 11 is specifically described as follows. The first area 11 refers to the space between the liquid level line a and the top of the urea tank 1, which is the expansion volume of the urea tank 1 and should be mainly used to prevent the urea from freezing and expanding in winter and damaging the urea tank 1. Specifically, the liquid level line a is the maximum liquid level of the urea solution that the urea tank 1 can accommodate, and the liquid level line a is determined based on the volume of the second area 12. Defining the liquid level line a based on the size of the volume of the second area can better achieve the design purpose of the first area 11, ensuring that the urea solution is full and will not burst the urea tank 1 after expansion. Preferably, the volume of the first area 11 is 7% of the volume of the second area 12.

[0037] Preferably, the liquid level line a is also defined based on the volume of the third area 13 and the volume of the portion of the urea pump entering the urea tank 1, so as to more accurately evaluate the actual volume of the urea solution in the urea tank 1 after freezing and expansion, thereby reserving the volume of the first area 11 that matches it. Furthermore, the liquid level line a should be defined after the second area 12 and the third area 13 are designed.

[0038] Preferably, an opening is provided on the side of the urea tank 1 at the same height as the liquid level line a, and the opening is connected to the outside of the urea tank 1 and can be used to inject urea solution while preventing the height of the urea solution contained in the urea tank 1 from exceeding the liquid level line a.

[0039] The design of the second area 12 is specifically described as follows. The second area 12 refers to the space between the liquid level line a and the liquid level line b, which is actually the effective volume of the urea tank 1, that is, the urea solution in the second area 12 is the volume of urea solution that can be actually used for vehicle operation. Specifically, according to the method provided in this embodiment, the volume of the second area 12 should be determined according to the vehicle's driving speed, driving altitude, and cruising range requirements.

[0040] Preferably, in order to improve the design efficiency of the urea tank 1, different vehicle types can be preset according to the vehicle speed range, driving altitude range, and cruising range, and the corresponding volume of the second area 12 can be preset for different vehicle types. For example, according to the classification method in the following table, it is divided into three categories: pickup trucks, light passenger cars, and light trucks:

[0041]

[0042] Corresponding to the three types of vehicles, the volume of the second area 12 of the pickup truck model is 3000L / KM, the volume of the second area 12 of the light bus model is 3000L / KM, and the volume of the second area 12 of the light truck model is 2500L / KM.

[0043] Furthermore, in order to make the classification of vehicle types and the design of the corresponding urea tank 1 volume more accurate and in line with the needs, the vehicle speed range is determined based on vehicle performance, legal speed, and vehicle speed big data analysis results; the driving altitude range is determined based on legal regulations; and the cruising range is determined based on user demand survey results.

[0044] The design of the third area 13 is described in detail as follows. The third area 13 refers to the space between the liquid level line b and the bottom of the urea tank 1, which is the ineffective volume of the urea tank 1, that is, the third area 13 is designed to accommodate the urea solution that cannot be sucked and used by the solution pump 2 because the urea tank 1 is not limited by the physical structure of the solution pump 2. The volume of the third area 13 is determined by the height of the liquid level line b, which is the height of the part where the solution pump 2 enters the urea tank 1. Preferably, the distance from the liquid level line b to the bottom of the urea tank 1 is 30 mm.

[0045] Example 2

[0046] This embodiment provides a car design method. The car design method in this embodiment includes the urea tank design method described in Example 1.

[0047] Since the main invention of the present invention lies in the design of the urea tank, the design of other contents is not limited and can be designed by a design method known to those skilled in the art. Therefore, no further description will be given here.

[0048] It should be pointed out that the explanation of the implementation method and beneficial effects of the design method of the urea tank in the above-mentioned embodiment 1 is also applicable to the automobile design method of this embodiment, and will not be elaborated here in detail to avoid redundancy.

[0049] The above describes the specific embodiments of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A design method for a urea tank, characterized in that: The bottom side of the urea tank is open, and the solution pump enters the interior of the urea tank through the opening portion. The interior of the urea tank includes a first liquid level line, a second liquid level line, a first area, a second area, and a third area; The first area is the space between the first liquid level line and the top of the urea tank, which is used to prevent the urea solution from freezing and expanding to damage the urea tank. The first liquid level line is determined according to the volume of the second area. The second area is the space between the first liquid level line and the second liquid level line, and the volume of the second area is determined according to the vehicle's driving speed, driving altitude, and cruising range requirements; The third area is a space between the second liquid level line and the bottom of the urea tank. The height of the second liquid level line is the height of the portion where the solution pump enters the urea tank.

2. The design method of the urea tank according to claim 1, characterized in that: The first liquid level line is also determined based on the volume of the third region and the volume of the urea pump entering the urea tank.

3. The design method of the urea tank according to claim 1, characterized in that: The first liquid level line should be drawn after the design of the second area and the third area is completed.

4. The design method of the urea tank according to claim 1, characterized in that: An opening connected to the outside of the urea tank is provided at a side of the urea tank at the same height as the first liquid level line.

5. The design method of the urea tank according to claim 1, characterized in that: The volume of the second region is determined according to the following steps: Different vehicle types are preset according to the vehicle's speed range, altitude range, and mileage range; Presetting the corresponding volumes of the second area for different vehicle types; in: The vehicle speed range is determined based on vehicle performance, legal speed, and vehicle speed big data analysis results; The driving altitude range is determined according to legal regulations; The range of driving range is determined based on the results of user demand surveys.

6. A method for designing an automobile, characterized in that: A design method for a urea tank comprising the steps of any one of claims 1 to 5.

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