CN101608579B - Method for controlling instantaneous working condition combustion noise of diesel engine by utilizing exhaust gas recirculation and device therefor - Google Patents
Method for controlling instantaneous working condition combustion noise of diesel engine by utilizing exhaust gas recirculation and device therefor Download PDFInfo
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- CN101608579B CN101608579B CN2009100690203A CN200910069020A CN101608579B CN 101608579 B CN101608579 B CN 101608579B CN 2009100690203 A CN2009100690203 A CN 2009100690203A CN 200910069020 A CN200910069020 A CN 200910069020A CN 101608579 B CN101608579 B CN 101608579B
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Abstract
The present invention discloses a technical method for controlling instantaneous working condition combustion noise of a diesel engine by utilizing exhaust gas recirculation (EGR) and a device thereof. An intake pipeline and an exhaust pipeline of the diesel engine are respectively introduced with an EGR valve and an EGR cooler, and a CO2 gas analysis meter is used for metering EGR rate. An EGR controller can be used for feeling the occurrence of instantaneous working condition by an accelerator position signal and controlling exhaust pressure and the EGR rate after receiving signals of the rotating speed, the accelerator position, the engine coolant temperature, the EGR rate and the like, thus providing a proper EGR working condition. A signal acquisition card is used for acquiring parameters such as pressure inside a cylinder, surface vibration, radiation noise and the like, and a computer is used for processing data of the signals so as to test and verify the control effect of the EGR for the instantaneous working condition combustion noise of the diesel engine. The technical method is different from the original way of introducing the EGR only before instantaneous working condition, and can adjust the EGR rate according to the different points of working condition, so as to ensure the power loss of the diesel engine to be within 6%; furthermore, the proper EGR rate can lead the radiation noise of an internal-combustion engine with the instantaneous working condition to be reduced by more than 1dBA.
Description
Technical field
The invention belongs to the combustion in IC engine technology, be specifically related to control the technological method and the device of diesel transient operating mode combustion noise.
Background technique
The noise that the diesel engine operation produces mainly is a combustion noise, wherein attaches most importance to diesel engine with direct injection especially.It is big when generally, the instantaneous conditions combustion noise is than same rotating speed, same steady state condition of loading.The instantaneous conditions running mainly shows engine start, acceleration and deceleration etc., and therefore most of test program of defined all relates to instantaneous conditions in the relevant vehicle noise test of NBS.Studies show that: the same load under transient state and the steady state condition is with the difference of rotating speed combustion noise, be because the differentia influence of two kinds of operating mode fuel injection quantity differences and chamber wall surface temperature to delay period, causes the difference of transient state and stable state aerodynamic load and high frequency oscillation.
Exhaust gas recirculation (hereinafter to be referred as-EGR) technology can be used to reduce NOx.When diesel engine turned round under load, the EGR opening of valves made a spot of waste gas enter the firing chamber by intake manifold.Waste gas is a kind of non-combustible gas (not containing fuel and oxygenant), does not participate in burning in the firing chamber.It reduces combustion temperature and pressure by the part heat that absorbs the burning generation, to reduce the growing amount of nitrogen oxides.When adopting the EGR technology, the waste gas of high temperature enters suction tude, will make intake temperature improve, thereby can make the delay period of burning shorten, and passes through to reduce combustion temperature and pressure, thereby reduces the rough property of burning, so can reduce combustion noise.The objective of the invention is to lead, make under instantaneous conditions, increase EGR and lead, thereby improve intake temperature to shorten the delay period of burning, to realize reducing the purpose of instantaneous conditions combustion noise by control EGR.
Summary of the invention
The objective of the invention is to use EGR Technology, a kind of technological method and device of controlling diesel transient operating mode combustion noise is provided.
System and device that the present invention proposes and working principle are as shown in Figure 1.Exhaust gas recirculation-abbreviation EGR, this device mainly are made up of the system of EGR control and parameter measurement except that diesel engine system.In the inlet and outlet pipeline of diesel engine, introduce EGR valve and cooler for recycled exhaust gas, passed through CO
2Gas Analyzers is measured EGR and is led.The EGR controller is after the tach signal, throttle position signal, engine water temperature signal and the EGR that receive diesel engine such as lead at signal, and pressure and EGR in the control gas exhaust piping lead, and a kind of suitable exhaust gas recirculation operating mode can be provided thus.Can gather in-cylinder pressure, wall surface temperature, tubing pressure, surface vibration by data acquisition card simultaneously, take 9 methods to measure the motor average sound pressure level at semianechoic room, and import computer into, by computer measurement signal is carried out data processing, checking EGR is to diesel transient operating mode combustion noise control effect.
Use the concrete know-why of EGR control diesel transient operating mode combustion noise method to be: to quicken at diesel engine, when instantaneous conditionss such as varying duty take place, all realize by stepping on the gas.Experience the generation of instantaneous conditions by throttle position signal, by regulating the aperture of back pressure valve and EGR valve, waste gas is introduced the diesel engine intake road then.After waste gas is introduced in the diesel engine intake road, make intake temperature improve, delay period shortens, and makes the rate of pressure rise of diesel combustion reduce.In addition, EGR makes combustion temperature reduce, and makes velocity of combustion slow down, and an amount of EGR can make burning more even again, and these make the in-cylinder pressure high frequency oscillation weaken.Weakening of the reduction of the rate of pressure rise and pressure high frequency oscillation makes diesel combustion soft, and combustion noise reduces, and the instantaneous conditions radiated noise reduces.Whole device when power loss surpasses tolerance interval (6%), can be regulated the aperture of back pressure valve and EGR valve by rotating speed, torque and the power of EGR control system monitoring diesel engine automatically, reduces EGR and leads.
Description of drawings
Fig. 1 is experimental setup of the present invention and structure principle chart.
Fig. 2 is three kinds of load condition test results to the influence of diesel transient operating mode radiated noise.
Fig. 3 is the influence of EGR to the rate of pressure rise; Fig. 4 is the influence of EGR to the in-cylinder pressure level
Embodiment
Below in conjunction with embodiment structural principle of the present invention is described further, each parts is carried out system's connection according to shown in Figure 1.Outlet pipe 2 at diesel engine 1 has exhaust steam passage 3, and 6 of exhaust steam passage 3 and gas-entered passageways are provided with cooler for recycled exhaust gas 5.Exhaust steam passage 3 is provided with EGR valve 4.Between gas-entered passageway 6 and the outlet pipe 2 CO is housed
2Gas Analyzers 7.The signal input part of EGR controller 8 inserts from tach signal 9, throttle position signal 10, the engine water temperature signal 11 of diesel engine 1 and comes from CO
2The EGR of Gas Analyzers 7 leads signal 12; The output signal termination of EGR controller 8 and back pressure valve 13 and EGR valve 4.The input end of data acquisition card 14 inserts the parameter 16 that pressure, wall surface temperature, tubing pressure and diesel engine surface vibration in the cylinder of diesel engine are gathered; The output terminal of data acquisition card 14 links to each other with computer 15, the radiated noise signals 17 independent computers 15 that insert of diesel engine.The part exhaust of the Diesel Engine Exhaust Pipe that is in operation 2 is introduced gas-entered passageway 6 by exhaust steam passage 3 through EGR valve 4 and cooler for recycled exhaust gas 5.Pass through CO
2Gas Analyzers 7 is measured EGR and is led.The tach signal 9 of diesel engine, throttle position signal 10, engine water temperature signal 11 and EGR lead signal 12 etc. and receive by the EGR controller, and EGR controller output end signal connects and back pressure valve 13 and EGR valve 4.Quickening at diesel engine, when instantaneous conditionss such as varying duty take place, is to control by the accelerator open degree size, so the EGR controller can transmit the generation information of instantaneous conditions by throttle position signal 10.EGR controller 8 leads signal 12 according to diesel engine speed signal 9, throttle position signal 10, engine water temperature signal 11 and EGR, adjusts the aperture of back pressure valve 13 and EGR valve 4 in real time, and waste gas is introduced diesel engine intake road 6 by exhaust steam passage 3.Thereby under the realization instantaneous conditions,, reduce the purpose of combustion noise at the content of intake duct 6 increase waste gas.
EGR controller 8 can combine with ECU (Electrical Control Unit) (ECU) in electronic controlled diesel.Specifically in service, parameter and the radiated noise 17 signals such as in-cylinder pressure, wall surface temperature, tubing pressure, surface vibration 16 gathered by data acquisition card 14 import computer 15 into.The measurement signal of 15 pairs of in-cylinder pressures that import into of computer, wall surface temperature, tubing pressure, surface vibration, radiated noise carries out data processing, and checking EGR is to diesel transient operating mode combustion noise control effect.
The initial value of back pressure valve 13 and EGR valve 4 apertures is set in the instantaneous conditions process, and (the EGR valve opening is 50%, the back pressure valve aperture is 0%), then in the instantaneous conditions process, EGR controller 8 is adjusted the aperture of EGR valve and back pressure valve in real time, guarantee that by parameter monitoring it is lost in 6% diesel engine power, this method is different from the method for EGR introducing diesel engine in the past, and diesel engine all is not introduce EGR or just introduce a spot of EGR in the second half section of instantaneous conditions under instantaneous conditions before this.This method and pilot system proof can be lost (6%) under the little condition at guaranteed output, can be good at making Combustion Noise of Diesel Engine to reduce, thereby diesel transient operating mode radiated noise is reduced.
In order to verify the validity of the method that the present invention proposes, the elite three kinds of load conditions (Fig. 2) of getting carry out different EGR under the instantaneous conditions situation and lead test to the Combustion Noise of Diesel Engine influence.
Provide suitable EGR and lead initial value, carry out the instantaneous conditions noise testing that 10s quickens according to three kinds of load conditions respectively.The result of the instantaneous conditions total noise of centrifuge that different EGR lead under three kinds of load conditions is as shown in table 1.Load condition 1 as seen from Table 1, and EGR leads in 8.1%～13.8%, and diesel transient operating mode radiated noise reduces 1.7dB; During load condition 2, EGR leads in 9.8%～15.1%, and diesel transient operating mode radiated noise reduces 0.7dB; During load condition 3, EGR leads in 6.5%～16.1%, and diesel transient operating mode radiated noise reduces 0.9dB.
In order further directly to investigate the influence of EGR to Combustion Noise of Diesel Engine, choose the load condition 3 pairing 2400r/min operating modes in the table 1, investigate the influence of EGR to the in-cylinder pressure level and the rate of pressure rise, the experiment test result is as shown in Figure 3 and Figure 4.Fig. 3 demonstrates, EGR test IV makes the rate of pressure rise obviously reduce, make the in-cylinder pressure amplitude in this frequency range, all reduce, especially more obvious in the medium-high frequency effect, this shows that suitable EGR amount (for example EGR of load condition 3 correspondences test IV) can make combustion noise that obvious reduction is arranged.
Characteristics of the present invention are: introduce suitable EGR in the process of instantaneous conditions, be different from and traditional only introduce EGR before instantaneous conditions, do not introduce the mode of EGR in the instantaneous conditions process.This device can be adjusted EGR according to different operating points and lead, and guarantees that diesel engine power is lost in 6%.By three kinds of load condition instantaneous conditions combustion in IC engine noises are led the test that changes with EGR, the EGR of prove out leads instantaneous conditions internal-combustion engine radiated noise is reduced more than the 1dBA.
The variation that table 1 instantaneous conditions radiated noise leads with EGR
Claims (2)
1. utilize the device of exhaust gas recirculation control diesel transient operating mode combustion noise, exhaust gas recirculation-abbreviation EGR, device comprises: diesel engine, air inlet-outlet pipe, back pressure valve, EGR valve, cooler for recycled exhaust gas, exhaust steam passage, EGR controller, data acquisition card, computer, it is characterized in that having exhaust steam passage (3) at the outlet pipe (2) of diesel engine (1), be provided with cooler for recycled exhaust gas (5) between exhaust steam passage (3) and gas-entered passageway (6), exhaust steam passage (3) is provided with EGR valve (4), between gas-entered passageway (6) and outlet pipe (2) CO is housed
2Gas Analyzers (7), the signal input part of EGR controller (8) insert from tach signal (9), throttle position signal (10), the engine water temperature signal (11) of diesel engine (1) and come from CO
2The EGR of Gas Analyzers (7) leads signal (12); The output signal of EGR controller (8) is terminated at back pressure valve (13) and EGR valve (4), and the input end of data acquisition card (14) inserts the parameter (16) that pressure, wall surface temperature, tubing pressure and diesel engine surface vibration in the cylinder of diesel engine are gathered; The output terminal of data acquisition card (14) links to each other with computer (15), the independent computer (15) that inserts of the radiated noise signals of diesel engine (17), computer (15) carries out data processing to the measurement signal of the cylinder of diesel engine internal pressure imported into, wall surface temperature, tubing pressure, diesel engine surface vibration, radiated noise, and checking EGR is to diesel transient operating mode combustion noise control effect.
2. the device that utilizes exhaust gas recirculation control diesel transient operating mode combustion noise according to claim 1, it is characterized in that described EGR controller (8) transmits instantaneous conditions by throttle position signal (10), lead signal (12) according to described diesel engine speed signal (9), throttle position signal (10), engine water temperature signal (11) and EGR, adjust the aperture of described back pressure valve (13) and described EGR valve (4) in real time, the control diesel engine power is lost in 6%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100690203A CN101608579B (en) | 2009-05-26 | 2009-05-26 | Method for controlling instantaneous working condition combustion noise of diesel engine by utilizing exhaust gas recirculation and device therefor |
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| CN2009100690203A CN101608579B (en) | 2009-05-26 | 2009-05-26 | Method for controlling instantaneous working condition combustion noise of diesel engine by utilizing exhaust gas recirculation and device therefor |
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| CN101608579A CN101608579A (en) | 2009-12-23 |
| CN101608579B true CN101608579B (en) | 2011-07-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8494757B2 (en) * | 2010-08-17 | 2013-07-23 | GM Global Technology Operations LLC | Method for estimating and controlling accoustic noise during combustion |
| CN103674232B (en) * | 2013-12-13 | 2017-04-12 | 中联重科股份有限公司渭南分公司 | Sound intensity acquisition device for testing noise source |
| CN103674223B (en) * | 2013-12-13 | 2017-02-01 | 中联重科股份有限公司渭南分公司 | noise source testing device, system and method |
| CN103728139B (en) * | 2013-12-31 | 2016-02-10 | 天津大学 | Wide pressure limit EGR measuring system |
| CN103867348B (en) * | 2014-03-27 | 2016-05-25 | 天津大学 | For controlling the system and device of common rail engine transient operating mode combustion noise |
| CN106704014B (en) * | 2015-07-29 | 2019-11-01 | 长城汽车股份有限公司 | Combustion noise control method, system and the vehicle of supercharged diesel internal combustion engine |
| CN109505706A (en) * | 2017-09-14 | 2019-03-22 | 郑州宇通客车股份有限公司 | Reduce the method and device of engine combustion noise |
| CN114562371B (en) * | 2020-11-27 | 2023-04-28 | 长城汽车股份有限公司 | Method and device for determining optimal exhaust gas recirculation rate of vehicle, storage medium and vehicle |
| CN112610342B (en) * | 2020-12-15 | 2022-07-15 | 广西玉柴机器股份有限公司 | EGR valve control method for improving engine stop noise |
| CN114941593A (en) * | 2022-06-08 | 2022-08-26 | 哈尔滨东安汽车动力股份有限公司 | Measuring device and measuring method for EGR (exhaust gas Recirculation) rate of internal combustion engine |
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