A method for designing the volume of a carbon canister and an automobile

Abstract

The present invention relates to the technical field of automobile emissions, and provides a method for designing the volume of a carbon canister. The method specifically includes the following steps: S1. Determine the fuel vapor θ generated by the fuel tank where the carbon canister is located per unit time; S2. Determine the ratio of BAX1500 type activated carbon and BAX1100 type activated carbon, and then calculate the volume V<supgt;*< / supgt;<subgt;activated carbon< / subgt; of the activated carbon, that is, the volume of the carbon canister; S3. Based on the aspect ratio of the carbon canister, correct the volume V<supgt;*< / supgt;<subgt;activated carbon< / subgt> of the current carbon canister, and the corrected volume V<subgt;activated carbon< / subgt> of the carbon canister is the final volume of the carbon canister. By optimizing the ratio of BAX1500 type activated carbon and BAX1100 type activated carbon, the present invention makes the use cost of the carbon canister as small as possible under the conditions of meeting the adsorption requirements of the fuel tank and the volume constraint of the carbon canister, and comprehensively considers the performance, volume and use cost of the carbon canister.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile emissions, and provides a method for designing the volume of a carbon canister and an automobile. Background Art

[0002] The function of the fuel evaporation emission control system is to introduce fuel vapor into the engine for combustion, improve fuel economy, prevent it from volatilizing into the air, and avoid environmental pollution caused by fuel vapor entering the atmosphere. In this process, the role of the carbon canister is to store oil vapor, and the working ability of the carbon canister depends on the type and volume of activated carbon.

[0003] Currently in the market, in order to meet the requirements of the National VI regulations and increase the working ability of the carbon canister, activated carbon of BAX1500 is usually used, which can reduce the filling amount of activated carbon, but leads to a substantial increase in the cost of the carbon canister. If activated carbon of BAX1100 is used, although the price is cheap, the required volume of the carbon canister is large and the layout is difficult. Summary of the Invention

[0004] The present invention provides a method for designing the volume of a carbon canister, aiming to improve the above problems.

[0005] The present invention is implemented as follows. A method for designing the volume of a carbon canister, the method specifically includes the following steps:

[0006] S1. Determine the fuel vapor θ generated by the fuel tank where the carbon canister is located per unit time;

[0007] S2. Determine the ratio of BAX1500 type activated carbon and BAX1100 type activated carbon, and then calculate the volume V of the activated carbon * 活性炭 , that is, the volume of the carbon canister.

[0008] Further, after step S2, it further includes:

[0009] S3. Based on the aspect ratio of the carbon canister, correct the current volume V of the carbon canister * 活性炭 , and the corrected volume V of the carbon canister 活性炭 , is the final volume of the carbon canister.

[0010] Further, if the ratio of BAX1500 type activated carbon to BAX1100 type activated carbon is C1:C2, and C1 + C2 = 1, then the volume V of the activated carbon * 活性炭 The calculation formula is as follows:

[0011]

[0012] Among them, θ is the fuel vapor generated by the fuel tank per unit time, and L1 and L2 respectively represent the adsorption capacities of BAX1500 activated carbon and BAX1100 activated carbon, with the unit of g / L.

[0013] Furthermore, the method for obtaining the ratio C1:C2 is as follows:

[0014] (1) Calculate the usage cost S of BAX1500 activated carbon and BAX1100 activated carbon at the ratio c1:c2.

[0015] (2) Define the adsorption requirement of the fuel tank and the volume constraint of the carbon canister:

[0016] (3) Output the ratio with the minimum usage cost among the ratios of BAX1500 activated carbon and BAX1100 activated carbon at the ratio c1:c2 that meet the adsorption requirement of the fuel tank and the volume constraint of the carbon canister, which is the ratio C1:C2.

[0017] Furthermore, the calculation formula for the usage cost S is as follows:

[0018] S = (c1v 活性炭 p1 + c2v 活性炭 p2) - Tv 活性炭 Lp3

[0019] Among them, T is the renewal period of the activated carbon in the carbon canister, v 活性炭 is the volume of the activated carbon, L is the adsorption capacity of the carbon canister of BAX1500 activated carbon and BAX1100 activated carbon at the ratios c1 and c2, L = c1L1 + c2L2, c1 + c2 = 1, p3 is the fuel price, and p1 and p2 respectively represent the prices of BAX1500 activated carbon and BAX1100 activated carbon.

[0020] Furthermore, the adsorption requirement of the fuel tank and the volume constraint of the carbon canister are expressed as follows:

[0021] Meet the adsorption requirement of the fuel tank: v 活性炭 ×L ≥ θ, where θ is the fuel vapor generated by the fuel tank per unit time;

[0022] Volume constraint of the carbon canister: v 活性炭 ≤ v m , v m is the maximum volume of the carbon canister allowed for the vehicle model.

[0023] Furthermore, the correction method for the volume V * 活性炭 of the carbon canister is as follows:

[0024] Detect whether the aspect ratio of the carbon canister is greater than or equal to the set value. If the detection result is yes, reduce the volume V *活性炭 If the detection result is negative, increase the carbon canister volume V while keeping the aspect ratio of the carbon canister unchanged * 活性炭 .

[0025] Furthermore, the set value is taken as 0.35, and the carbon canister volume V is reduced * 活性炭 It means reducing the carbon canister volume to 0.9V * 活性炭 , increase the carbon canister volume V * 活性炭 It means increasing the carbon canister volume to 1.1V * 活性炭 .

[0026] Furthermore, the calculation formula of the fuel vapor θ is specifically as follows:

[0027] θ = η·δ·V 油箱

[0028] where η is the safety factor with a value range of 0.7 to 0.9, V 油箱 is the volume of the fuel tank where the carbon canister is located, and δ is the fuel vapor generation rate of the fuel tank

[0029] The present invention is implemented as follows. A vehicle is integrated with a fuel tank, and a carbon canister for adsorbing fuel vapor is provided above the fuel tank or at the top inside the fuel tank. The volume of the carbon canister is determined based on the above carbon canister volume design method, so that the usage cost expenditure of the carbon canister is minimized as much as possible under the condition of meeting the adsorption requirements of the fuel tank and the volume constraint of the carbon canister

[0030] The present invention optimizes the ratio of BAX1500 type activated carbon and BAX1100 type activated carbon to minimize the usage cost of the carbon canister under the condition of meeting the adsorption requirements of the fuel tank and the volume constraint of the carbon canister, and evenly considers the performance, volume and usage cost of the carbon canister BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flowchart of the carbon canister volume design method provided by the embodiment of the present invention DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following further describes the specific embodiments of the present invention in detail by describing the optimal embodiments with reference to the accompanying drawings

[0033] Figure 1 It is a flowchart of the carbon canister volume design method provided by the embodiment of the present invention, and the method specifically includes the following steps

[0034] S1. Determine the fuel vapor generated by the fuel tank where the carbon canister is located per unit time

[0035] In the embodiments of the present invention, the method for determining the fuel vapor generated by fuel per unit time specifically includes the following steps:

[0036] S11. Determine the rated volume V of the fuel tank where the carbon canister is located 油箱 , which is generally determined based on the power performance and cruising range of the vehicle model to obtain the rated volume V of the fuel tank 油箱 ;

[0037] S12. Determine the fuel vapor generation rate δ of the fuel tank, and the value range of the fuel vapor generation rate δ is 1.1 - 1.6;

[0038] S13. Calculate the fuel vapor θ generated by the fuel tank per unit time, and its specific calculation formula is as follows:

[0039] θ = η·δ·V 油箱

[0040] where η is the safety factor, and the value range is 0.7 - 0.9, V 油箱 is the volume of the fuel tank where the carbon canister is located, and δ is the fuel vapor generation rate of the fuel tank.

[0041] S2. Determine the ratio of BAX1500 activated carbon and BAX1100 activated carbon, and then calculate the volume V of the activated carbon * 活性炭 , that is, the volume of the carbon canister;

[0042] Assume that the ratio of BAX1500 activated carbon to BAX1100 activated carbon is C1:C2, and C1 + C2 = 1, then the volume V of the activated carbon * 活性炭 The calculation formula is as follows:

[0043]

[0044] where θ is the fuel vapor generated by the fuel tank per unit time, and L1 and L2 respectively represent the adsorption capacities of BAX1500 activated carbon and BAX1100 activated carbon, with the unit: g / L.

[0045] In the embodiments of the present invention, BAX1500 activated carbon and BAX1100 activated carbon are the commonly used activated carbons for carbon canisters. BAX1500 activated carbon has strong adsorption capacity L1 and relatively high price p1, while BAX1100 activated carbon has weak adsorption capacity L2 and relatively low price p2. The present invention aims to find the ratio C1:C2 of BAX1500 activated carbon and BAX1100 activated carbon with the highest benefit under the condition of meeting the adsorption requirements of the fuel tank and the volume constraint of the carbon canister. The method for obtaining the ratio C1:C2 is specifically as follows:

[0046] (1) Calculate the usage cost S of BAX1500 activated carbon and BAX1100 activated carbon at the ratio c1:c2. The specific calculation formula is as follows:

[0047] S = (c1v 活性炭 p1 + c2v 活性炭 p2) - Tv 活性炭 Lp3

[0048] Among them, T is the renewal period of the activated carbon in the carbon canister, v 活性炭 is the volume of the activated carbon, L is the adsorption capacity of the carbon canister for BAX1500 activated carbon and BAX1100 activated carbon at the ratio c1, c2, L = c1L1 + c2L2, c1 + c2 = 1, p3 is the fuel price, which is the current fuel price or the historical average fuel price, and p1, p2 respectively represent the prices of BAX1500 activated carbon and BAX1100 activated carbon;

[0049] (2) Define the fuel tank adsorption demand and the carbon canister volume constraint:

[0050] Condition 1: Meet the fuel tank adsorption demand, v 活性炭 ×L ≥ θ, where θ is the fuel vapor generated by the fuel tank per unit time;

[0051] Condition 2: The volume constraint of the carbon canister, v 活性炭 ≤ v m , v m is the maximum carbon canister volume allowed for the vehicle model.

[0052] (3) Output the ratio with the minimum usage cost among the ratios of BAX1500 activated carbon and BAX1100 activated carbon at the ratio c1:c2 that meet the fuel tank adsorption demand and the carbon canister volume constraint, which is the ratio C1:C2.

[0053] S3. Based on the aspect ratio of the carbon canister, correct the current carbon canister volume V * 活性炭 The corrected carbon canister volume V 活性炭 is the final volume of the carbon canister.

[0054] In the embodiment of the present invention, since the carbon canister with a large aspect ratio has a strong adsorption capacity and the carbon canister with a small aspect ratio has a weak adsorption capacity, therefore, based on the influence of the aspect ratio of the carbon canister on the adsorption capacity of the carbon canister, correct the current carbon canister volume V * 活性炭 The specific correction method of the carbon canister volume V * 活性炭 is as follows:

[0055] Detect whether the aspect ratio of the carbon canister is greater than or equal to the set value. If the detection result is yes, reduce the carbon canister volume V while keeping the aspect ratio of the carbon canister unchanged.* 活性炭 If the test result is negative, increase the canister volume V while keeping the aspect ratio of the canister unchanged * 活性炭 .

[0056] Set the set value to 3.5. If the aspect ratio of the canister is greater than or equal to 3.5, reduce the canister volume to 0.9V while keeping the aspect ratio of the canister unchanged * 活性炭 If the aspect ratio of the canister is less than 3.5, increase the canister volume to 1.1V while keeping the aspect ratio of the canister unchanged * 活性炭 .

[0057] The invention also provides an automobile, which is integrated with a fuel tank, and a canister for adsorbing fuel vapor is provided above the fuel tank or at the top inside the fuel tank. The volume of the canister is determined based on the above canister volume design method, and the use cost of the canister is minimized as much as possible under the condition of meeting the adsorption requirements of the fuel tank and the volume constraint of the canister

[0058] The invention optimizes the ratio of BAX1500 type activated carbon and BAX1100 type activated carbon to minimize the use cost of the canister under the condition of meeting the adsorption requirements of the fuel tank and the volume constraint of the canister, and comprehensively considers the performance, volume and use cost of the canister

[0059] The invention has been described exemplarily. Obviously, the specific implementation of the invention is not limited by the above methods. As long as various non-substantial improvements are made by adopting the method concept and technical solution of the invention, or the concept and technical solution of the invention are directly applied to other occasions without improvement, they are all within the protection scope of the invention

Claims

1. A method for designing the volume of a carbon canister, characterized in that, The method specifically includes the following steps: S1. Determine the fuel vapor θ generated by the fuel tank where the carbon canister is located per unit time; S2. Determine the ratio of BAX1500 activated carbon and BAX1100 activated carbon, and then calculate the volume V of the activated carbon * 活性炭 , that is, the volume of the carbon canister; The method for obtaining the ratio C1:C2 is as follows: (1) Calculate the usage cost S of BAX1500 activated carbon and BAX1100 activated carbon at the ratio c1:c2; (2) Define the adsorption requirement of the fuel tank and the volume constraint of the carbon canister; (3) Output the ratio with the minimum usage cost among the ratios of BAX1500 activated carbon and BAX1100 activated carbon at the ratio c1:c2 that meet the adsorption requirement of the fuel tank and the volume constraint of the carbon canister, which is the ratio C1:C2; The calculation formula for the usage cost S is as follows: S = (c1v 活性炭 p1 + c2v 活性炭 p2) - Tv 活性炭 Lp3 Among them, T is the update period of the activated carbon in the carbon canister, v 活性炭 is the volume of the activated carbon, L is the adsorption capacity of the carbon canister of BAX1500 type activated carbon and BAX1100 type activated carbon under the ratios c1 and c2, L = c1L1 + c2L2, c1 + c2 = 1, p3 is the fuel price, and p1 and p2 respectively represent the prices of BAX1500 type activated carbon and BAX1100 type activated carbon; The volume V of activated carbon * 活性炭 The calculation formula is as follows: where θ is the fuel vapor generated by the fuel tank per unit time, and L1 and L2 respectively represent the adsorption capacities of BAX1500 activated carbon and BAX1100 activated carbon; After step S2, it further includes: S3. Based on the aspect ratio of the charcoal canister, correct the current volume V of the charcoal canister * 活性炭 to obtain the corrected volume V 活性炭 of the charcoal canister, which is the final volume of the charcoal canister; Carbon canister volume V * 活性炭 The correction method is as follows: Check whether the aspect ratio of the carbon canister is greater than or equal to the set value. If the test result is yes, reduce the carbon canister volume V while keeping the aspect ratio of the carbon canister unchanged * 活性炭 , if the test result is no, increase the carbon canister volume V while keeping the aspect ratio of the carbon canister unchanged * 活性炭 .

2. The carbon canister volume design method according to claim 1, wherein The adsorption requirement of the fuel tank and the volume constraint of the carbon canister are expressed as follows: Meet the adsorption requirements of the fuel tank: v 活性炭 ×L ≥ θ, where θ is the fuel vapor generated by the fuel tank per unit time; Volume constraint of the carbon canister: v 活性炭 ≤ v m where v m is the maximum volume of the carbon canister allowed for the vehicle model.

3. The carbon canister volume design method according to claim 1, wherein The set value is taken as 0.35, reducing the volume V of the carbon canister * 活性炭 It means reducing the volume of the carbon canister to 0.9V * 活性炭 , increasing the volume V of the carbon canister * 活性炭 It means increasing the volume of the carbon canister to 1.1V * 活性炭 .

4. The carbon canister volume design method according to claim 1, wherein, The calculation formula for the fuel vapor θ is as follows: θ = η·δ·V 油箱 Among them, η is the safety factor with a value range of 0.7 to 0.9, V 油箱 is the volume of the fuel tank where the carbon canister is located, and δ is the fuel vapor generation rate of the fuel tank.

5. A vehicle, characterized in that, The vehicle is integrated with a fuel tank, and a carbon canister for adsorbing fuel vapor is provided above the fuel tank or at the top inside the fuel tank. The volume of the carbon canister is determined based on the carbon canister volume design method according to any one of claims 1 to 4, and the usage cost of the carbon canister is minimized as much as possible under the condition of meeting the adsorption requirement of the fuel tank and the volume constraint of the carbon canister.

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