CN112179804A - Supercharged engine oil dilution evaluation method - Google Patents
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- CN112179804A CN112179804A CN202011057024.2A CN202011057024A CN112179804A CN 112179804 A CN112179804 A CN 112179804A CN 202011057024 A CN202011057024 A CN 202011057024A CN 112179804 A CN112179804 A CN 112179804A
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Abstract
A method for evaluating engine oil dilution of a supercharged engine belongs to the technical field of automobile engine tests. The method adopts a weighing method and comprises the following steps: preparing before testing; weighing; baking at constant temperature; weighing two measuring cups once every 1 hour, recording the net weight of the engine oil in the measuring cup 1 as A-1h, the net weight of the engine oil and the fuel oil in the measuring cup 2 as C-1h, and so on, when the net weight of the engine oil in the measuring cup 1 is A-nh and the net weight of the engine oil and the fuel oil in the measuring cup 2 as C-nh at the nth hour; when { C-C-nh- (A-A-nh) }/A-nh is less than or equal to 8 percent, stopping the test to obtain the test effect achieved after baking for n hours, and dividing the result of the weighing method by 60 to 88 percent through statistical analysis to obtain the content of diluted gasoline and impurities in the engine oil which actually works; pouring 1L of the engine oil used for 50 hours into the measuring cup 1, and weighing and recording the net weight D of the engine oil in the measuring cup 1; putting the measuring cup 1 into a precise constant-temperature oven for heating and baking, weighing after n hours, and recording the net weight A-nh of the oil sample in the measuring cup 1; the engine oil dilution amount X is (D-D-nh) }/D-nh/60%; the method is used for the engine oil dilution evaluation of the supercharged engine.
Description
Technical Field
The invention belongs to the technical field of automobile engine tests, and particularly relates to a method for evaluating engine oil dilution of a supercharged engine.
Background
During engine testing, excessive liquid flow from the crankcase vent often occurs due to oil dilution, which results in a decrease in oil viscosity. The dilution of the engine oil, i.e. fuel oil, products of incomplete combustion, engine oil oxides, insoluble substances generated by friction and the like are mixed into the engine oil, so that the viscosity of the engine oil is abnormally reduced, and the engine oil is scrapped early.
The engine oil dilution test was conducted to obtain the diluted gasoline content in engine oil after 50 hours of full speed full load operation. In the prior art, a gas chromatographic analysis method is adopted, so that the measurement is accurate, but the cost is high, the period is long, and the rapid development and optimization of products are not facilitated. Therefore, a novel engine oil dilution evaluation method needs to be designed, and reliable engine oil dilution test data can be provided at low scientific research cost and high test speed.
Disclosure of Invention
The invention aims to provide a supercharged engine oil dilution evaluation method, which can enable engine oil dilution test measurement to be more convenient and fast and provide reliable test data with lower scientific research cost and higher test speed.
The technical scheme adopted by the invention is as follows:
a supercharged engine oil dilution evaluation method adopts a weighing method, and comprises the following specific steps:
the method comprises the following steps: preparing before testing; selecting a proper test site according to the gasoline characteristics, selecting a balance as test weighing equipment, preparing two measuring cups of 3 +/-0.5L, and respectively naming the two measuring cups as a measuring cup 1 and a measuring cup 2; preparing a precise constant-temperature oven 1 table;
step two: weighing; pouring 1L of brand new engine oil into the measuring cup 1, and weighing and recording the net weight A of the engine oil;
pouring 1L of brand new engine oil into the measuring cup 2, weighing and recording the net weight B of the engine oil; then, adding fuel oil with the net weight of the engine oil of 8 percent of the net weight B into the measuring cup 2, and weighing and recording the net weight C of the total amount of the engine oil and the fuel oil;
step three: baking at constant temperature; placing the measuring cup 1 and the measuring cup 2 into a precise constant-temperature oven for heating and baking, setting the temperature to be 120 +/-3 ℃, weighing the weights of the two measuring cups once every 1 hour, recording the net weight of the engine oil in the measuring cup 1 as A-1h, recording the net weight of the engine oil + the fuel oil in the measuring cup 2 as C-1h, and so on, when the net weight of the engine oil in the measuring cup 1 is A-nh and the net weight of the engine oil + the fuel oil in the measuring cup 2 as C-nh at the nth hour; wherein h represents an hour; simultaneously recording the current site temperature, humidity and atmospheric pressure every hour;
when { C-C-nh- (A-A-nh) }/A-nh is less than or equal to 8%, stopping the test, pouring oil samples in the two measuring cups, cleaning the measuring cups to obtain a test effect achieved after baking for n hours, comparing and analyzing a test result of the dilution amount of the engine oil with a gas chromatographic analysis method, wherein the dilution result of the engine oil by the weighing method is lower than that of the gas chromatographic analysis method, but the trend is consistent, and dividing the result of the weighing method by 60-88% through statistical analysis to obtain the content of diluted gasoline and impurities in the engine oil which actually works;
step four: measuring a formal oil sample; pouring 1L of the engine oil used for 50 hours into the measuring cup 1, and weighing and recording the net weight D of the engine oil in the measuring cup 1; placing the measuring cup 1 into a precise constant-temperature oven for heating and baking, and setting the temperature of the precise constant-temperature oven to be 120 +/-3 ℃; weighing after n hours, and recording the net weight A-nh of the oil sample in the measuring cup 1;
the engine oil dilution amount X is (D-D-nh) }/D-nh/60%;
wherein X is the dilution content of engine oil, and D-nh is the net weight of the oil sample after constant temperature nh.
Compared with the prior art, the invention has the beneficial effects that: the engine oil dilution measurement is more convenient and fast, and the time required for carrying out the entrustment is reduced from 1 week to 5 hours per month; reduces the scientific research cost from about 1 ten thousand yuan/time of entrustment cost to 500 yuan/time of month. The invention relates to a novel method for evaluating the dilution of engine oil of a supercharged engine. Through the constant temperature oven heating weighing method, can be more quick carry out the test and measure. The method is convenient to operate, low in cost, has very important scientific research significance for subsequent engine oil dilution optimization, and has high popularization and application values.
Drawings
FIG. 1 is a comparative analysis diagram of the weighing method and the gas chromatography used in the present invention, in which the dotted line shows the scale analysis diagram of the weighing method and the solid line shows the scale analysis diagram of the gas chromatography.
Detailed Description
The first embodiment is as follows: the embodiment discloses a method for evaluating engine oil dilution of a supercharged engine, which adopts a weighing method and comprises the following specific steps:
the method comprises the following steps: preparing before testing; selecting a proper (ventilated and dried) test site according to the gasoline characteristics, selecting a balance as test weighing equipment, preparing two measuring cups of 3 +/-0.5L, and respectively naming the two measuring cups as a measuring cup 1 and a measuring cup 2; preparing a precision constant-temperature oven 1 (a 101A-0 type precision constant-temperature oven is preferably adopted);
step two: weighing; pouring 1L of brand new engine oil into the measuring cup 1, and weighing and recording the net weight A of the engine oil;
pouring 1L of brand new engine oil into the measuring cup 2, weighing and recording the net weight B of the engine oil; then, adding fuel oil (ethanol gasoline or required grade gasoline) with the net weight of the engine oil of 8 percent of the net weight B into the measuring cup 2, and weighing and recording the net weight C of the total amount of the engine oil and the fuel oil;
step three: baking at constant temperature; placing the measuring cup 1 and the measuring cup 2 into a precise constant-temperature oven for heating and baking, setting the temperature to be 120 +/-3 ℃, weighing the weights of the two measuring cups once every 1 hour, recording the net weight of the engine oil in the measuring cup 1 as A-1h, recording the net weight of the engine oil + the fuel oil in the measuring cup 2 as C-1h, and so on, when the net weight of the engine oil in the measuring cup 1 is A-nh and the net weight of the engine oil + the fuel oil in the measuring cup 2 as C-nh at the nth hour; wherein h represents an hour; simultaneously recording the current site temperature, humidity and atmospheric pressure every hour;
when { C-C-nh- (A-A-nh) }/A-nh is less than or equal to 8%, stopping the test, pouring oil samples in the two measuring cups, cleaning the measuring cups to obtain the test effect achieved after baking for n hours (such as 4 hours), comparing and analyzing the test result of the dilution amount of the engine oil with the gas chromatography (see attached figure 1), wherein the dilution result of the engine oil is lower than that of the gas chromatography, but the trend is consistent, and the content of the diluted gasoline in the engine oil which is actually worked is obtained by dividing the result of the weighing method by 60-88% through statistical analysis;
step four: measuring a formal oil sample; pouring 1L of the engine oil used for 50 hours into the measuring cup 1, and weighing and recording the net weight D of the engine oil in the measuring cup 1; placing the measuring cup 1 into a precise constant-temperature oven for heating and baking, and setting the temperature of the precise constant-temperature oven to be 120 +/-3 ℃; weighing after n hours, and recording the net weight A-nh of the oil sample in the measuring cup 1;
the engine oil dilution amount X is (D-D-nh) }/D-nh/60%;
wherein X is the dilution content of engine oil, and D-nh is the net weight of the oil sample after constant temperature nh.
Example (b):
the limit value of the dilution content of the engine oil of a certain supercharged direct injection engine is 10%, the dilution content X of the engine oil measured after the test is 8.3%, and the requirement of the limit value is met.
Claims (1)
1. A supercharged engine oil dilution evaluation method is characterized by comprising the following steps: the method adopts a weighing method, and comprises the following specific steps:
the method comprises the following steps: preparing before testing; selecting a proper test site according to the gasoline characteristics, selecting a balance as test weighing equipment, preparing two measuring cups of 3 +/-0.5L, and respectively naming the two measuring cups as a measuring cup 1 and a measuring cup 2; preparing a precise constant-temperature oven 1 table;
step two: weighing; pouring 1L of brand new engine oil into the measuring cup 1, and weighing and recording the net weight A of the engine oil;
pouring 1L of brand new engine oil into the measuring cup 2, weighing and recording the net weight B of the engine oil; then, adding fuel oil with the net weight of the engine oil of 8 percent of the net weight B into the measuring cup 2, and weighing and recording the net weight C of the total amount of the engine oil and the fuel oil;
step three: baking at constant temperature; placing the measuring cup 1 and the measuring cup 2 into a precise constant-temperature oven for heating and baking, setting the temperature to be 120 +/-3 ℃, weighing the weights of the two measuring cups once every 1 hour, recording the net weight of the engine oil in the measuring cup 1 as A-1h, recording the net weight of the engine oil + the fuel oil in the measuring cup 2 as C-1h, and so on, when the net weight of the engine oil in the measuring cup 1 is A-nh and the net weight of the engine oil + the fuel oil in the measuring cup 2 as C-nh at the nth hour; wherein h represents an hour; simultaneously recording the current site temperature, humidity and atmospheric pressure every hour;
when { C-C-nh- (A-A-nh) }/A-nh is less than or equal to 8%, stopping the test, pouring oil samples in the two measuring cups, cleaning the measuring cups to obtain a test effect which is achieved after baking for n hours (such as 4 hours), comparing and analyzing an engine oil dilution test result with a gas chromatography analysis method, wherein the weighing method is lower than the gas chromatography engine oil dilution result but consistent in trend, and dividing the result of the weighing method by 60-88% through statistical analysis to obtain the content of diluted gasoline and impurities in the actually-working engine oil;
step four: measuring a formal oil sample; pouring 1L of the engine oil used for 50 hours into the measuring cup 1, and weighing and recording the net weight D of the engine oil in the measuring cup 1; placing the measuring cup 1 into a precise constant-temperature oven for heating and baking, and setting the temperature of the precise constant-temperature oven to be 120 +/-3 ℃; weighing after n hours, and recording the net weight A-nh of the oil sample in the measuring cup 1;
the engine oil dilution amount X is (D-D-nh) }/D-nh/60%;
wherein X is the dilution content of engine oil, and D-nh is the net weight of the oil sample after constant temperature nh.
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Cited By (2)
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| CN113418818A (en) * | 2021-06-16 | 2021-09-21 | 一汽奔腾轿车有限公司 | Engine oil dilution measuring method of high-pressure direct injection gasoline engine |
| CN114235629A (en) * | 2021-12-20 | 2022-03-25 | 奇瑞汽车股份有限公司 | Method for rapidly judging tolerance and release performance of different engine oils diluted by fuel oil |
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Application publication date: 20210105 |