Method for Reducing Vehicle Background Hydrocarbon Evaporation Pollutants

Abstract

The present invention provides a method for reducing vehicle background hydrocarbon evaporation pollutants, which includes: S1, performing vehicle preparation, test chamber preparation and vehicle soaking; S2, turning on the lighting device and increasing the air-conditioning temperature; S3, judging the concentration of environmental hydrocarbon evaporation pollutants, if the concentration change rate is less than 10 3 , proceed to S4; if the concentration change rate is greater than or equal to 10 3 , return to S2; S4, turning off the lighting device and reducing the temperature; S5, when the test chamber temperature drops to 23°C, turn on the ventilator for ventilation; S6, testing the concentration of hydrocarbon evaporation pollutants in the test chamber, if the concentration is less than 2 ppmC, proceed to S7; if the concentration is greater than or equal to 2 ppmC, restore the test chamber to 40°C and return to S5; S7, soaking the vehicle for 4 hours at the test chamber temperature of 23°C; S8, measuring the concentration of hydrocarbon evaporation pollutants in the test chamber, if the concentration is greater than or equal to 3 ppmC, return to S5; if the concentration is less than or equal to 3 ppmC, the vehicle conducts an evaporation pollutant emission test. The present invention accelerates the rapid evaporation of in-vehicle HC pollutants and greatly reduces the vehicle background HC evaporation pollutants.

Description

Technical Field

[0001] The present invention relates to the field of vehicle pollutant treatment, and particularly to a method for reducing background hydrocarbon evaporation pollutants of vehicles. Background Art

[0002] At present, for the evaporation pollution emission test of the fuel system of type Ⅳ vehicles in "GB 18352-2016 Limits and Measurement Methods for Emissions from Light-Duty Vehicles", a running-in requirement of at least 3000 km before the vehicle test is proposed. The main purpose of the 3000 km running-in requirement for new vehicles is: after running in for more than 3000 km, the HC evaporates generated by the plastic and rubber parts of the new vehicle itself are significantly reduced, without affecting the test results of the HC evaporation of the fuel system.

[0003] Therefore, significantly reducing the background HC evaporation of new vehicles is an inevitable process for the type Ⅳ fuel evaporation pollutant emission test, but there are some problems with the method of running in for more than 3000 km required by the standard.

[0004] The running in for more than 3000 km has the following problems:

[0005] First, it consumes a large amount of test resources in the laboratory or test track, and the test cycle and test cost are relatively high.

[0006] Second, the driving mileage of more than 3000 km for new vehicles will increase the depreciation of new vehicles.

[0007] Through experimental analysis and research, it is found that the main sources of vehicle background HC evaporation pollutants are:

[0008] First, plastic interior trim.

[0009] Second, tires.

[0010] Third, windshield washer fluid and grease.

[0011] Fourth, the protective film on the vehicle interior instrument panel and seats.

[0012] Figure 1 It is the result of a special experimental study on the sources of background HC evaporation pollutants of a certain vehicle model.

[0013] As Figure 1 shown, for each source of evaporation pollutants, the experimental methods for reducing evaporation pollutants are further studied, and more efficient and economical experimental methods are proposed.

[0014] In view of this, the inventor of the present application has designed a method for reducing vehicle background hydrocarbon evaporation pollutants in order to overcome the above technical problems. Summary of the Invention

[0015] The technical problem to be solved by the present invention is to overcome the defect that the test method for reducing evaporation pollutants in the prior art still needs to further improve efficiency and economy, and to provide a method for reducing background hydrocarbon evaporation pollutants of vehicles.

[0016] The present invention solves the above technical problem through the following technical solutions:

[0017] A method for reducing background hydrocarbon evaporation pollutants of vehicles, characterized in that the method for reducing background hydrocarbon evaporation pollutants of vehicles includes the following steps:

[0018] S1. Perform vehicle preparation, test chamber preparation and test chamber vehicle immersion.

[0019] S2. Turn on the lighting device with an intensity set at 1200 w / m 2 , and increase the air-conditioning temperature to be greater than or equal to 40 °C.

[0020] S3. Judge the concentration of ambient hydrocarbon evaporation pollutants. If the concentration change rate is less than 10 -3 , then proceed to step S4;

[0021] If the concentration change rate is greater than or equal to 10 -3 , then return to step S2 to continue high-temperature baking.

[0022] S4. Turn off the lighting device and lower the air-conditioning target temperature, and quickly lower the test chamber temperature to 23 °C.

[0023] S5. When the test chamber temperature drops to 23 °C, turn on the ventilator for ventilation.

[0024] S6. Measure the concentration of hydrocarbon evaporation pollutants in the test chamber. If the concentration is less than 2 ppmC, then proceed to step S7;

[0025] If the concentration is greater than or equal to 2 ppmC, then the test chamber needs to be restored to 40 °C, and then return to step S5;

[0026] S7. Immerse the vehicle for 4 hours at a test chamber temperature of 23 °C.

[0027] S8. Measure the concentration of hydrocarbon evaporation pollutants in the test chamber. If the concentration is greater than or equal to 3 ppmC, then the test chamber needs to be restored to 40 °C, and then return to step S5 again;

[0028] If the concentration is less than 3 ppmC, then the vehicle and test chamber preparation are completed, and the vehicle can perform an evaporation pollutant emission test.

[0029] According to an embodiment of the present invention, the vehicle preparation in step S1 includes: replacing the vehicle tires with the same type of used tires, using clear water instead of windshield washer fluid, removing the plastic protective film inside the vehicle, draining the fuel in the fuel tank, and opening all windows, skylights, the engine hood, and the trunk.

[0030] According to an embodiment of the present invention, the test chamber preparation in step S1 includes: controlling the temperature of the test chamber to 23 °C and measuring the concentration of hydrocarbon evaporation pollutants in the test chamber.

[0031] According to an embodiment of the present invention, the test chamber vehicle immersion in step S1 includes: immersing the vehicle for 12 hours at a temperature of 23 °C and measuring the concentration of hydrocarbon evaporation pollutants in the test chamber.

[0032] According to an embodiment of the present invention, step S3 includes: measuring the concentration of hydrocarbon evaporation pollutants in the environment every 4 hours, recording the change rate of the concentration, and when the concentration change rate k is less than 10 -3 , step S4 can be entered;

[0033] If the concentration change rate k is greater than or equal to 10 -3 , continue high-temperature baking;

[0034] The calculation formula for the concentration change rate is:

[0035] where k represents the change rate of the HC concentration in the continuously recorded time period of the test chamber, HC_Vi represents the volume concentration of HC in ppmC in the test chamber, and i represents the HC concentration recording sequence.

[0036] According to an embodiment of the present invention, between step S3 and step S4, it also includes: judging the total time of high-temperature baking. If the total time T < 48 hours, continue to maintain high-temperature baking;

[0037] If the total time T ≥ 48 hours, step S4 can be entered.

[0038] According to an embodiment of the present invention, the height of the air vent in step S5 is 30 cm, or the height of the air vent is the same as the chassis height of the test vehicle, and the flow rate of the air exchanger is 120 m 3 / h.

[0039] According to an embodiment of the present invention, the air exchange time of the air exchanger lasts for 1 hour.

[0040] According to an embodiment of the present invention, in step S6, if the concentration is greater than or equal to 2 ppmC, the test chamber needs to be restored to 40 °C for 4 hours, and then return to step S5.

[0041] According to an embodiment of the present invention, if the concentration of hydrocarbon evaporation pollutants in the test chamber is greater than 3 ppmC in step S8, the test chamber needs to be restored to 40 °C and maintained for 4 hours, and then return to step S5 again.

[0042] The positive and progressive effects of the present invention are as follows:

[0043] The method for reducing the background hydrocarbon evaporation pollutants of the vehicle of the present invention formulates a new method process for high-temperature baking, and the 0 km running-in of the test vehicle can also meet the requirements of the evaporation pollutant emission test.

[0044] The method proposes to accelerate the rapid evaporation of HC pollutants in the vehicle by combining air conditioning, lighting to increase the ambient temperature, and air exchange by the fan, and greatly reduce the background HC evaporation pollutants of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and other features, properties, and advantages of the present invention will become more apparent from the following description in conjunction with the drawings and embodiments, in which like reference numerals always represent the same features, where:

[0046] Figure 1 is a flowchart of the method for reducing the background hydrocarbon evaporation pollutants of the vehicle of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the drawings.

[0048] Embodiments of the present invention will now be described in detail with reference to the drawings. Preferred embodiments of the present invention will now be described in detail, which are illustrated in the drawings. Whenever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0049] In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein.

[0050] In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning implied by each term.

[0051] In the prior art, the main materials of vehicle interiors, seats, instrument panels, etc. are PP polyethylene, PVC polyvinyl chloride, PET polyurethane, PP fibers, etc. These parts just off the production line will volatilize styrene, acetaldehyde, acrolein, etc. Under normal temperature storage conditions, it takes a long time to evaporate completely.

[0052] In view of this situation, the method for reducing vehicle background hydrocarbon evaporation pollutants in the present invention proposes to accelerate the rapid evaporation of hydrocarbon (HC) evaporation pollutants in the vehicle interior by combining increasing the ambient temperature by air conditioning and light, and ventilation by a fan, thereby significantly reducing vehicle background hydrocarbon (HC) evaporation pollutants.

[0053] Figure 1 It is a flowchart of the method for reducing vehicle background hydrocarbon evaporation pollutants in the present invention.

[0054] As Figure 1 shown, the present invention discloses a method for reducing vehicle background hydrocarbon evaporation pollutants, which includes the following steps:

[0055] Step S1: Conduct vehicle preparation, test chamber preparation, and vehicle immersion in the test chamber.

[0056] Among them, preferably, the vehicle preparation in step S1 preferably includes: replacing the vehicle tires with the same type of used tires, using clean water instead of windshield washer fluid (draining all the windshield washer fluid), removing the plastic protective film inside the vehicle, draining the fuel in the fuel tank, opening all windows and sunroofs (if equipped), the engine hood, and the trunk.

[0057] The test chamber preparation in step S1 preferably includes: controlling the temperature of the test chamber to 23 °C and measuring the concentration of hydrocarbon (HC) evaporation pollutants in the test chamber.

[0058] The vehicle immersion in the test chamber in step S1 preferably includes: immersing the vehicle for 12 hours at a temperature of 23 °C and measuring the concentration of hydrocarbon (HC) evaporation pollutants in the test chamber.

[0059] Step S2: Turn on the lighting device with an intensity of 1200 w / m 2 , and increase the air conditioning temperature to be greater than or equal to 40 °C.

[0060] Step S3: Judge the concentration of ambient hydrocarbon evaporation pollutants. If the concentration change rate is less than 10 -3 , then proceed to step S4;

[0061] If the concentration change rate is greater than or equal to 10 -3 , then return to step S2 to continue high-temperature baking.

[0062] Preferably, for example, step S3 may include: measuring the concentration of hydrocarbon (HC) evaporation pollutants in the environment every 4 hours, recording the concentration change rate, and when the concentration change rate k is less than 10 -3 , step S4 can be entered;

[0063] If the concentration change rate k is greater than or equal to 10 3 , continue high-temperature baking;

[0064] The calculation formula for the rate of change of concentration is as follows:

[0065] Among them, k represents the rate of change of HC concentration in the time period continuously recorded in the test chamber, HC_Vi represents the volume concentration of HC in ppmC in the test chamber, and i represents the HC concentration recording sequence.

[0066] In addition, further, preferably, between the step S3 and the step S4, it may further include: judging the total time of high-temperature baking. If the total time T < 48 hours, then continue to maintain high-temperature baking;

[0067] If the total time T ≥ 48 hours, then it can enter the step S4.

[0068] Step S4: Turn off the lighting equipment and lower the target temperature of the air conditioner to quickly reduce the temperature of the test chamber to 23°C.

[0069] Step S5: When the temperature of the test chamber drops to 23°C, turn on the ventilator for ventilation.

[0070] Further preferably, the height of the ventilation opening in the step S5 can preferably be 30 cm, or the height of the ventilation opening is the same as the chassis height of the test vehicle. The flow rate of the ventilator can preferably be 120 m 3 / h.

[0071] Here, the ventilation time of the ventilator preferably lasts for 1 hour.

[0072] Since the evaporated hydrocarbon (HC) is a high-molecular organic compound with a density higher than that of air, when the temperature of the test chamber drops significantly, more HC evaporation pollutants will be deposited below. In this way, it is easier to absorb the HC background pollutants in the test chamber cleanly through the ventilator, and the ventilation time lasts for 1 hour.

[0073] Step S6: Test the concentration of HC evaporation pollutants in the test chamber. If the concentration is less than 2 ppmC, then enter step S7;

[0074] If the concentration is greater than or equal to 2 ppmC, then it is necessary to restore the test chamber to 40°C and then return to step S5.

[0075] Among them, preferably, when the concentration is greater than or equal to 2 ppmC in the step S6, it is necessary to restore the test chamber to 40°C for 4 hours and then return to step S5.

[0076] Step S7: Immerse the vehicle for 4 hours at the temperature of 23°C in the test chamber.

[0077] Step S8: Measure the concentration of HC evaporation pollutants in the test chamber. If the concentration is greater than or equal to 3 ppmC, then it is necessary to restore the test chamber to 40°C and then return to step S5 again;

[0078] If the concentration is less than 3 ppmC, the vehicle and the test chamber are ready, and the vehicle can conduct the evaporative emissions test.

[0079] Preferably, in step S8, if the concentration of hydrocarbon evaporative pollutants in the test chamber is greater than 3 ppmC, the test chamber needs to be restored to 40 °C and maintained for 4 hours, and then return to step S5 again.

[0080] In summary, the method for reducing the background hydrocarbon evaporative pollutants of the present invention formulates a brand-new method process for high-temperature baking, and the 0 km running-in of the test vehicle can also meet the requirements of the evaporative emissions test.

[0081] The method proposed accelerates the rapid evaporation of HC pollutants in the vehicle by combining the increase of the ambient temperature by the air conditioner and light and the air exchange by the fan, and greatly reduces the background HC evaporative pollutants of the vehicle.

[0082] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for reducing vehicle background hydrocarbon evaporation pollutants, characterized in that, The method for reducing vehicle background hydrocarbon evaporation pollutants includes the following steps: S1. Prepare the vehicle, prepare the test chamber, and immerse the vehicle in the test chamber; S2. Turn on the lighting device with an intensity set at 1200 w / m 2 , and increase the air conditioner temperature to be greater than or equal to 40°C; S3. Determine the concentration of environmental hydrocarbon evaporation pollutants. If the concentration change rate is less than 10 -3 , then proceed to step S4; If the concentration change rate is greater than or equal to 10 -3 , then return to step S2 to continue high-temperature baking; The said step S3 includes: measuring the concentration of hydrocarbon evaporation pollutants in the environment every 4 hours, recording the change rate of the concentration, and when the change rate k of the concentration is less than 10 -3 , step S4 can be entered; If the concentration conversion rate k is greater than or equal to 10 -3 Continue with high-temperature baking The calculation formula for the rate of change of concentration is as follows: where k represents the change rate of HC concentration in the continuous recording time period of the test chamber, and HC_V i represents the volume concentration of HC in ppmC in the test chamber, and i represents the HC concentration recording sequence; S4. Turn off the lighting equipment and lower the target temperature of the air conditioner, and quickly lower the temperature of the test chamber to 23°C; S5. When the temperature of the test chamber drops to 23°C, turn on the ventilator for ventilation; S6. Measure the concentration of hydrocarbon evaporation pollutants in the test chamber. If the concentration is less than 2 ppmC, proceed to step S7; If the concentration is greater than or equal to 2 ppmC, the test chamber needs to be restored to 40°C, and then return to step S5; S7. Immerse the vehicle for 4 hours at a temperature of 23°C in the test chamber; S8. Measure the concentration of hydrocarbon evaporation pollutants in the test chamber. If the concentration is greater than or equal to 3 ppmC, the test chamber needs to be restored to 40°C, and then return to step S5 again; If the concentration is less than 3 ppmC, the vehicle and the test chamber are ready, and the vehicle can conduct an evaporation pollutant emission test.

2. The method for reducing vehicle background hydrocarbon evaporation pollutants according to claim 1, characterized in that, The vehicle preparation in step S1 includes: replacing the vehicle tires with the same model of old tires, using clear water instead of windshield washer fluid, removing the plastic protective film inside the vehicle, draining the fuel in the fuel tank, and opening all windows, skylights, the engine hood, and the trunk.

3. The method for reducing vehicle background hydrocarbon evaporation pollutants according to claim 1, characterized in that, The test chamber preparation in step S1 includes: controlling the temperature of the test chamber to 23°C and measuring the concentration of hydrocarbon evaporation pollutants in the test chamber.

4. The method for reducing vehicle background hydrocarbon evaporation pollutants according to claim 1, characterized in that, The test chamber vehicle immersion in step S1 includes: immersing the vehicle for 12 hours at a temperature of 23°C and measuring the concentration of hydrocarbon evaporation pollutants in the test chamber.

5. The method for reducing vehicle background hydrocarbon evaporation pollutants according to claim 1, characterized in that, Between step S3 and step S4, it also includes: judging the total time of high-temperature baking. If the total time T < 48 hours, continue to maintain high-temperature baking; if the total time T ≥ 48 hours, then proceed to step S4.

6. The method for reducing vehicle background hydrocarbon evaporation pollutants according to claim 1, characterized in that, In the step S5, the height of the air vent is 30 cm, or the height of the air vent is the same as the chassis height of the test vehicle, and the flow rate of the air exchanger is 120 m 3 / h.

7. The method for reducing vehicle background hydrocarbon evaporation pollutants according to claim 6, characterized in that, The ventilation time of the ventilator lasts for 1 hour.

8. The method for reducing vehicle background hydrocarbon evaporation pollutants according to claim 1, characterized in that, In step S6, if the concentration is greater than or equal to 2 ppmC, the test chamber needs to be restored to 40°C for 4 hours, and then return to step S5.

9. The method for reducing vehicle background hydrocarbon evaporation pollutants according to claim 1, characterized in that, In step S8, if the measured concentration of hydrocarbon evaporation pollutants in the test chamber is greater than 3 ppmC, the test chamber needs to be restored to 40°C for 4 hours, and then return to step S5 again.

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