CN102445345A - Fuel-air leakage monitoring system and method of motor laboratory as well as motor experimental system - Google Patents
Fuel-air leakage monitoring system and method of motor laboratory as well as motor experimental system Download PDFInfo
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- CN102445345A CN102445345A CN2010105115037A CN201010511503A CN102445345A CN 102445345 A CN102445345 A CN 102445345A CN 2010105115037 A CN2010105115037 A CN 2010105115037A CN 201010511503 A CN201010511503 A CN 201010511503A CN 102445345 A CN102445345 A CN 102445345A
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Abstract
The invention provides a fuel-air leakage real-time monitoring system and method of a motor laboratory as well as a motor experimental system. The monitoring system comprises an inlet air flow meter (1), a fuel consumption meter (2), an exhaust air-fuel ratio sensor (3) and a processor (4), wherein the inlet air flow meter (1) is used for detecting the inlet air quantity m_air of a motor in real time; the fuel consumption meter (2) is used for detecting the fuel quantity m_fuel of the motor in real time; the exhaust air-fuel ratio sensor (3) is used for detecting actual air-fuel ratio AF_actual in the combusted exhaust of the motor; and the processor (4) is used for calculating the theoretical air-fuel ratio AF_calc according to the inlet air quantity m_air of the motor and the fuel quantity m_fuel of the motor, and judging whether fuel-air leakage exists in the motor or not according to the calculated theoretical air-fuel ratio AF_calc and the actual air-fuel ratio AF_actual. The method provided by the invention can be used for detecting various fuel-air parameters in real time and judging whether fuel-air leakage happens so as to ensure that the leakage problem is discovered in time; and the method is rapid in response and lower in cost.
Description
Technical field
The present invention relates to oil gas and reveal the monitoring technique field, be specifically related to a kind of engine testing laboratory oil and gas leakage real-time monitoring system, method and a kind of engine test system.
Background technology
Along with developing of automobile industry, new work engine type and Research on New and exploitation have also obtained extensive concern and attention.For new architecture or new technology are verified, most engine producer has introduced dynamometer machine and supporting control device, threst stand is carried out the output power of various simulated operations and test engine.
But these equipment often can't be realized running fully automatically owing to the shortage of peripheral matched facility.For example, the monitoring of whether revealing for the intake and exhaust and the oil circuit of threst stand just lacks relevant device.The manual supervisory method of many employings in the prior art, or utilize the first-class equipment of shooting to monitor, but finally all be to depend on artificial next investigation regularly.This mode is labor intensive not only, the more important thing is to guarantee in time to find that oil gas reveals, and accuracy of experimental results and validity also can't be protected like this, and the development of new technology has been brought negative effect.
Therefore, the real-time monitoring to oil and gas leakage aspect, laboratory had become the key link of promoting advanced research technique and quickening new technology research and development progress already.
Summary of the invention
The purpose of this invention is to provide a kind of engine testing laboratory oil and gas leakage real-time monitoring system that can in time find the engine oil gas leakage, method and a kind of engine test system.
According to an aspect of the present invention; Engine testing laboratory oil and gas leakage real-time monitoring system provided by the invention comprises charge flow rate meter, fuel consumption meter, exhaust air-fuel ratio sensor and the processor that is connected with said charge flow rate meter, fuel consumption meter, exhaust air-fuel ratio sensor respectively; Said charge flow rate meter is used for real-time detection of engine air inflow m_air; Said fuel consumption meter is used for real-time detection of engine oil mass m_fuel; Said exhaust air-fuel ratio sensor is used for the actual mixing ratio AF_actual of the exhaust after the real-time detection of engine burning; Said processor is used to obtain said air input of engine by air m_air, engine oil mass m_fuel and actual mixing ratio AF_actual; According to said air input of engine by air m_air, engine oil mass m_fuel theory of computation air-fuel ratio AF_calc, and judge whether to exist the engine oil gas leakage according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual.
According to a further aspect in the invention; The present invention also provides a kind of engine test system; This system comprises charge flow rate meter, fuel consumption meter, exhaust air-fuel ratio sensor, dynamometer machine and the Dynamometer Control device that is connected with said charge flow rate meter, fuel consumption meter, exhaust air-fuel ratio sensor, dynamometer machine respectively; Said charge flow rate meter is used for real-time detection of engine air inflow m_air; Said fuel consumption meter is used for real-time detection of engine oil mass m_fuel; Said exhaust air-fuel ratio sensor is used for the actual mixing ratio AF_actual of the exhaust after the real-time detection of engine burning; Said Dynamometer Control device is used to obtain said air input of engine by air m_air, engine oil mass m_fuel and actual mixing ratio AF_actual, according to said air input of engine by air m_air, engine oil mass m_fuel theory of computation air-fuel ratio AF_calc, and judges whether to exist the engine oil gas leakage according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual.
According to another aspect of the invention, engine testing laboratory oil and gas leakage method for real-time monitoring provided by the invention may further comprise the steps:
Real-time detection of engine air inflow m_air;
Real-time detection of engine oil mass m_fuel;
Actual mixing ratio AF_actual in the exhaust after the detection of engine burning in real time;
According to said air input of engine by air m_air, engine oil mass m_fuel theory of computation air-fuel ratio AF_calc, and judge whether to exist the engine oil gas leakage according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual.
Engine testing laboratory oil and gas leakage real-time monitoring system provided by the invention and method can detect various oil gas parameters in real time and the two judges whether to take place oil and gas leakage based on chemically correct fuel and actual mixing ratio; Compare and rely on the mode that manpower is monitored in the prior art; Can guarantee in time to find leakage problem, be swift in response and cost lower; Thereby make oil and gas leakage can access timely solution, guaranteed accuracy of experimental results and validity.According to engine test stand provided by the invention can also be when take place leaking the running of shutting engine down experimental stand, therefore the operation fully automatically for experimental stand provides a kind of reliable measure and means.
Description of drawings
Fig. 1 is the structured flowchart of engine testing laboratory oil and gas leakage real-time monitoring system provided by the invention;
Fig. 2 is the structured flowchart according to the engine testing laboratory oil and gas leakage real-time monitoring system of one embodiment of the present invention;
Fig. 3 is the structured flowchart of engine test provided by the invention system;
Fig. 4 is the process flow diagram of engine testing laboratory oil and gas leakage method for real-time monitoring provided by the invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation.
It shown in Fig. 1 engine testing laboratory oil and gas leakage real-time monitoring system provided by the invention; For the ease of explanation; Also show the engine test system of this system of application among the figure, this experimental system comprises engine 6, engine air inlet tube 7, the exhaust pipe of engine 5, engine fuel injection pump 8 etc.As shown in Figure 1, this system comprises charge flow rate meter 1, fuel consumption meter 2, exhaust air-fuel ratio sensor 3 and the processor 4 that is connected with said charge flow rate meter 1, fuel consumption meter 2, exhaust air-fuel ratio sensor 3 respectively.The dotted line of band arrow is shown for being electrically connected among the figure, and all the other solid lines are that pipeline connects.
Wherein, said charge flow rate meter 1 is used for real-time detection of engine air inflow m_air (units/h) also can detected air input of engine by air m_air be outputed to processor 4.As shown in Figure 1, this charge flow rate meter 1 can be arranged on the pipeline before the engine air inlet tube 7, to detect all air inlets that get into engine 6.This charge flow rate meter 1 can be selected various suitable gas meters for use.
Said fuel consumption meter 2 is used for real-time detection of engine oil mass m_fuel (units/h) also can detected engine oil mass m_fuel be outputed to processor 4.As shown in Figure 1, this fuel consumption meter 2 can be arranged on the pipeline before the engine fuel injection pump 8, to detect all fuel oils that get into engine 6.This fuel consumption meter 2 can be selected various suitable fuel consumption meters for use.
Said exhaust air-fuel ratio sensor 3 is used for the actual mixing ratio AF_actual of the exhaust after the real-time detection of engine burning and detected actual mixing ratio AF_actual is outputed to processor 4.Air-fuel ratio is meant the ratio of combustion mixture air quality and fuel oil quality.As shown in Figure 1, this exhaust air-fuel ratio sensor 3 can be arranged on the exhaust pipe of engine 5, thereby from the gas of engine 6 burning back dischargings, detects air-fuel ratio.This exhaust air-fuel ratio sensor 3 can adopt various suitable air-fuel ratio sensors, like the broad domain oxygen sensor (lambda sensor) of automobile.
Said processor 4 is used to obtain said air input of engine by air m_air, engine oil mass m_fuel and actual mixing ratio AF_actual; According to said air input of engine by air m_air, engine oil mass m_fuel theory of computation air-fuel ratio AF_cale, and judge whether to exist the engine oil gas leakage according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual.
Specifically, said processor 4 is according to formula (1) theory of computation air-fuel ratio AF_calc:
AF_calc=m_air/m_fuel formula (1)
Then, processor 4 judges whether to exist the engine oil gas leakage according to the chemically correct fuel AF_calc that calculates with the relation of actual mixing ratio AF_actual, for example passes through both ratio or difference or the like.
A preferred embodiment of the invention, preferably the ratio R atio according to formula (2) theory of computation air-fuel ratio AF_calc and actual mixing ratio AF_actual judges whether to exist the engine oil gas leakage, as follows:
Ratio=AF_calc/AF_actual formula (2)
In theory, if oil and gas leakage does not take place, chemically correct fuel AF_calc should equal actual mixing ratio AF_actual, and then both ratio R atio should equal 1, therefore, if this ratio is not equal to 1, then can think the generation oil and gas leakage.In the practical operation, can a rational preset range be set, in the time of outside ratio is in this preset range, then judge to have the engine oil gas leakage according to actual conditions.For example be in when (containing end value) within the 0.95-1.05 as ratio R atio, think that then pipeline is normal, oil and gas leakage does not take place, and when this ratio R atio is in outside the 0.95-1.05, then judge to have the engine oil gas leakage.
In addition, can also theory of computation air-fuel ratio AF_calc and the difference of actual mixing ratio AF_actual judge, when difference surpasses a threshold value, then can judge the engine oil gas leakage.
As shown in Figure 2, engine testing laboratory oil and gas leakage real-time monitoring system provided by the present invention can also be attached in the engine test system and use, and this experimental system also comprises dynamometer machine 10 and Dynamometer Control device 9 except that the device shown in Fig. 1.
Therefore; As shown in Figure 2; According to preferred implementation of the present invention, said processor 4 can also above-mentioned ratio R atio (or difference etc.) outputing to Dynamometer Control device 9, perhaps directly will judge whether to exist the judged result of engine oil gas leakage to send to Dynamometer Control device 9.When Dynamometer Control device 9 can be outside ratio R atio be in like the scope of 0.95-1.05 like this; Judge and have the engine oil gas leakage; Perhaps directly obtain judged result; And the running through dynamometer machine 10 shutting engine down experimental stands, to prevent the generation of the undesired or dangerous situation of experimental result.
Said processor 4 can be independent of Dynamometer Control device 9 and exist; Also can be integrated among the Dynamometer Control device 9; In the time of among being integrated in Dynamometer Control device 9, charge flow rate meter 1, fuel consumption meter 2, exhaust air-fuel ratio sensor 3 can be directly connected on the Dynamometer Control device 9.
Therefore; The present invention also provides a kind of engine test system; As shown in Figure 3, this system comprises charge flow rate meter 1, fuel consumption meter 2, exhaust air-fuel ratio sensor 3, dynamometer machine 10 and the Dynamometer Control device 9 that is connected with said charge flow rate meter 1, fuel consumption meter 2, exhaust air-fuel ratio sensor 3, dynamometer machine 10 respectively.
Wherein charge flow rate machine 1, fuel consumption meter 2, exhaust air-fuel ratio sensor 3 and above-mentioned functions are basic identical, and difference only is said air input of engine by air m_air, engine oil mass m_fuel and actual mixing ratio AF_actual are sent to Dynamometer Control device 9.
Said Dynamometer Control device 9 is used to obtain said air input of engine by air m_air, engine oil mass m_fuel and actual mixing ratio AF_actual; According to said air input of engine by air m_air, engine oil mass m_fuel theory of computation air-fuel ratio AF_calc, and judge whether to exist the engine oil gas leakage according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual.
Said calculating and deterministic process are referring to the performed process of above-mentioned processor 4.Particularly, wherein said Dynamometer Control device 9 is configured to according to following formula theory of computation air-fuel ratio AF_calc:
AF_calc＝m_air/m_fuel。
And preferred, said Dynamometer Control device 9 is configured to the ratio R atio according to following formula theory of computation air-fuel ratio AF_calc and actual mixing ratio AF_actual:
Ratio＝AF_calc/AF_actual；
And when this ratio R atio is in outside the preset range, then judge to have the engine oil gas leakage.
Further, said Dynamometer Control device 9 can be worked as the running of passing through dynamometer machine 10 shutting engine down experimental stands when there is the engine oil gas leakage in judgement.
Shown in Figure 4 is the process flow diagram of engine testing laboratory oil and gas leakage method for real-time monitoring provided by the invention.As shown in Figure 4, this method comprises: real-time detection of engine air inflow m_air; Real-time detection of engine oil mass m_fuel; Actual mixing ratio AF_actual in the exhaust after the detection of engine burning in real time; According to said air input of engine by air m_air, engine oil mass m_fuel theory of computation air-fuel ratio AF_calc, and judge whether to exist the engine oil gas leakage according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual.
Wherein theory of computation air-fuel ratio AF_calc with judge whether to exist the method for engine oil gas leakage can be referring to the course of work of above-mentioned processor 4; But those skilled in the art it is understandable that engine testing laboratory oil and gas leakage method for real-time monitoring provided by the invention must not depend on engine testing laboratory oil and gas leakage real-time monitoring system provided by the invention.
Particularly, according to preferred implementation of the present invention, wherein according to following formula theory of computation air-fuel ratio AF_calc:
AF_calc＝m_air/m_fuel。
Under the preferable case, judge whether to exist the step of engine oil gas leakage to comprise according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual: the ratio R atio=AF_calc/AF_actual of theory of computation air-fuel ratio and actual mixing ratio; Judge whether this ratio is positioned at a preset range (like 0.95-1.05); When this ratio is not in this preset range, then judge to have the engine oil gas leakage.
According to the preferred embodiment of the present invention, this method also comprises: when above-mentioned ratio is not in said preset range, and the running of shutting engine down experimental stand.Can prevent the generation of the undesired or dangerous situation of experimental result like this.
Engine testing laboratory oil and gas leakage method for real-time monitoring provided by the invention and system can be applied to engine testing laboratory; Can monitor in real time the leakage of laboratory oil gas pipeline; To guarantee the timely discovery and the solution of leakage problem, also be that the operation fully automatically of experimental stand provides reliable measure and means simultaneously.
Claims (14)
1. an engine testing laboratory oil and gas leakage real-time monitoring system comprises charge flow rate meter (1), fuel consumption meter (2), exhaust air-fuel ratio sensor (3) and the processor (4) that is connected with said charge flow rate meter (1), fuel consumption meter (2), exhaust air-fuel ratio sensor (3) respectively;
Said charge flow rate meter (1) is used for real-time detection of engine air inflow m_air;
Said fuel consumption meter (2) is used for real-time detection of engine oil mass m_fuel;
Said exhaust air-fuel ratio sensor (3) is used for the actual mixing ratio AF_actual of the exhaust after the real-time detection of engine burning;
Said processor (4) is used to obtain said air input of engine by air m_air, engine oil mass m_fuel and actual mixing ratio AF_actual; According to said air input of engine by air m_air, engine oil mass m_fuel theory of computation air-fuel ratio AF_calc, and judge whether to exist the engine oil gas leakage according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual.
2. system according to claim 1, wherein said processor (4) is configured to according to following formula theory of computation air-fuel ratio AF_calc:
AF_calc＝m_air/m_fuel。
3. system according to claim 1, wherein said processor (4) is configured to the ratio R atio according to following formula theory of computation air-fuel ratio AF_calc and actual mixing ratio AF_actual:
Ratio＝AF_calc/AF_actual；
And when this ratio R atio is in outside the preset range, then judge to have the engine oil gas leakage.
4. system according to claim 3, wherein said preset range is 0.95-1.05.
5. according to claim 3 or 4 described systems, wherein said processor (4) is exported said ratio R atio or output judged result.
6. an engine test system comprises charge flow rate meter (1), fuel consumption meter (2), exhaust air-fuel ratio sensor (3), dynamometer machine (10) and the Dynamometer Control device (9) that is connected with said charge flow rate meter (1), fuel consumption meter (2), exhaust air-fuel ratio sensor (3), dynamometer machine (10) respectively;
Said charge flow rate meter (1) is used for real-time detection of engine air inflow m_air;
Said fuel consumption meter (2) is used for real-time detection of engine oil mass m_fuel;
Said exhaust air-fuel ratio sensor (3) is used for the actual mixing ratio AF_actual of the exhaust after the real-time detection of engine burning;
Said Dynamometer Control device (9) is used to obtain said air input of engine by air m_air, engine oil mass m_fuel and actual mixing ratio AF_actual; According to said air input of engine by air m_air, engine oil mass m_fuel theory of computation air-fuel ratio AF_calc, and judge whether to exist the engine oil gas leakage according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual.
7. system according to claim 6, wherein said Dynamometer Control device (9) is configured to according to following formula theory of computation air-fuel ratio AF_calc:
AF_calc＝m_air/m_fuel。
8. system according to claim 6, wherein said Dynamometer Control device (9) is configured to the ratio R atio according to following formula theory of computation air-fuel ratio AF_calc and actual mixing ratio AF_actual:
Ratio＝AF_calc/AF_actual；
And when this ratio R atio is in outside the preset range, then judge to have the engine oil gas leakage.
9. system according to claim 8, wherein said preset range is 0.95-1.05.
10. according to each described system among the claim 6-9, wherein said Dynamometer Control device (9) is when there is the engine oil gas leakage in judgement, through the running of dynamometer machine (10) shutting engine down experimental stand.
11. an engine testing laboratory oil and gas leakage method for real-time monitoring may further comprise the steps:
Real-time detection of engine air inflow m_air;
Real-time detection of engine oil mass m_fuel;
Actual mixing ratio AF_actual in the exhaust after the detection of engine burning in real time;
According to said air input of engine by air m_air, engine oil mass m_fuel theory of computation air-fuel ratio AF_calc, and judge whether to exist the engine oil gas leakage according to chemically correct fuel AF_calc that calculates and actual mixing ratio AF_actual.
12. method according to claim 11, wherein according to following formula theory of computation air-fuel ratio AF_calc:
AF_calc＝m_air/m_fuel。
13. method according to claim 11 wherein judges whether to exist the step of engine oil gas leakage to comprise according to the chemically correct fuel AF_calc and the actual mixing ratio AF_actual that calculate:
The ratio R atio=AF_calc/AF_actual of theory of computation air-fuel ratio and actual mixing ratio
Judge whether this ratio is positioned at a preset range; When this ratio is not in this preset range, then judge to have the engine oil gas leakage.
14. method according to claim 13, wherein said preset range are 0.95-1.05.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507731A (en) * | 2017-02-28 | 2018-09-07 | 比亚迪股份有限公司 | A kind of detection method and detecting system of tracheae leakage |
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| EP0811152B1 (en) * | 1995-02-24 | 2000-07-26 | Siemens Canada Limited | Fuel vapor leak detection system |
| CN101278112A (en) * | 2005-10-06 | 2008-10-01 | 卡特彼勒公司 | Gaseous fuel engine charge density control system |
| CN101454548A (en) * | 2006-04-27 | 2009-06-10 | 卡特彼勒公司 | Engine emissions control system |
| US20090187301A1 (en) * | 2008-01-17 | 2009-07-23 | Gm Global Technology Operations, Inc. | Detection of Engine Intake Manifold Air-Leaks |
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- 2010-10-11 CN CN2010105115037A patent/CN102445345A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0811152B1 (en) * | 1995-02-24 | 2000-07-26 | Siemens Canada Limited | Fuel vapor leak detection system |
| CN101278112A (en) * | 2005-10-06 | 2008-10-01 | 卡特彼勒公司 | Gaseous fuel engine charge density control system |
| CN101454548A (en) * | 2006-04-27 | 2009-06-10 | 卡特彼勒公司 | Engine emissions control system |
| US20090187301A1 (en) * | 2008-01-17 | 2009-07-23 | Gm Global Technology Operations, Inc. | Detection of Engine Intake Manifold Air-Leaks |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108507731A (en) * | 2017-02-28 | 2018-09-07 | 比亚迪股份有限公司 | A kind of detection method and detecting system of tracheae leakage |
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Application publication date: 20120509 |