WO2004109088A1 - ディーゼル機関の排気ガス還流制御装置 - Google Patents
ディーゼル機関の排気ガス還流制御装置 Download PDFInfo
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- WO2004109088A1 WO2004109088A1 PCT/JP2004/007741 JP2004007741W WO2004109088A1 WO 2004109088 A1 WO2004109088 A1 WO 2004109088A1 JP 2004007741 W JP2004007741 W JP 2004007741W WO 2004109088 A1 WO2004109088 A1 WO 2004109088A1
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- temperature
- exhaust gas
- value
- gas recirculation
- engine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0052—Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D2041/0067—Determining the EGR temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an exhaust gas recirculation type diesel engine which can suppress discharge of smoke and NO x.
- Patent Document 1 relates to an internal combustion engine in which a throttle valve is always provided as a configuration, as described in Claim 1 of the claims. That is, although it is described as an internal combustion engine, the embodiment describes a gasoline engine as an example, and FIG. 1 shows a suture pulp. Therefore, the diesel engine is clearly not included in the internal combustion engine expressed by the invention of Patent Document 1.
- a diesel machine capable of simultaneously controlling both NO x and smoke emitted by controlling the EGR rate to fall within a predetermined range.
- An object of the present invention is to provide an exhaust gas recirculation control device of Seki.
- a diesel engine provided with an exhaust gas recirculation passage that connects an intake passage and an exhaust passage, an upstream side of a portion of the intake passage that merges with the exhaust gas recirculation passage
- a first temperature sensor a second temperature sensor downstream of a portion of the intake passage merging with the exhaust gas recirculation passage, an engine load detection sensor and an engine speed detection sensor
- Storage means for storing in advance the intake air temperature before mixing and the temperature value at the second temperature sensor installation location corresponding to an appropriate exhaust gas recirculation amount uniquely defined from the engine load and the engine speed.
- a temperature value stored in the storage unit corresponding to a detection value detected from the engine load detection sensor, the engine speed detection sensor, and the first temperature sensor; And if the detected value is within a predetermined range from the temperature value, it is determined that the amount of recirculated exhaust gas is appropriate, and the detected value is the temperature value.
- a throttle valve is provided in the exhaust gas recirculation passage, the throttle valve being capable of adjusting a flow rate of the exhaust gas passing through the exhaust gas recirculation passage, and control means for controlling the opening of the throttle valve.
- the opening of the throttle valve is controlled by the control means, whereby the exhaust gas recirculation passage communication point of the intake passage corresponding to the temperature value on the upstream side of the exhaust gas recirculation passage communication point of the intake passage is provided.
- the temperature value on the downstream side was set to fall within a preset range.
- the temperature values stored in the storage means corresponding to the detected values detected by the engine load detection sensor, the engine speed detection sensor, and the first temperature sensor are stored. Averaging over time makes it possible to correct the response delay of the detection value by the second temperature sensor.
- the determining means determines when the engine load and the engine speed are stable.
- the recirculation exhaust gas amount is determined only for It has become.
- a cooling water temperature sensor for detecting a cooling water temperature is provided, and the cooling water temperature detected by the cooling water temperature sensor reaches a predetermined temperature.
- a detection means for detecting that the operation has been completed is provided, and after the completion of the warm-up operation and before the actual operation is started, or after the end of the actual operation and before the engine is stopped, the amount of the recirculated exhaust gas is determined by the determination means. Make a decision.
- the temperature value stored in the storage means corresponding to the detected values detected by the engine load detection sensor, the engine speed detection sensor, and the first temperature sensor; (2) The detection value detected by the temperature sensor is compared with the predetermined value.If the detection value is not within a predetermined range from the temperature value, the determination unit determines that the amount of recirculated exhaust gas is abnormal. Is set smaller on the side where the detection value of the second temperature sensor is higher than on the side where the detection value is lower.
- Claim 7 in the invention of claim 7! a correction means for correcting the temperature value stored in the storage means with a temperature value detected by the cooling water temperature sensor in a cold state is provided.
- an engine load detection sensor 6 and an engine speed detection sensor 7 are provided to grasp the operation status of the diesel engine 100, and the upstream temperature 1, the engine load, and the engine speed are uniquely determined.
- the pre-stored memory means downstream temperature corresponding to an appropriate exhaust gas recirculation amount to be defined is provided, 1 first temperature sensor for further detecting the upstream temperature 1 1 and the second temperature detecting the downstream temperature T 2 sensor 1 2 providing the door, and the temperature value corresponding to the operating conditions stored in the storage means, downstream temperature detected by the second temperature sensor 1 2 T compares a 2, mosquitoes temperature difference therebetween is within a predetermined range ⁇ not by the provided a determination device 1 three, both vo chi and smoke until it is possible to determine the force whether the diesel engine 1 0 0 EGR rate is normal, an abnormality is detected Emissions can be suppressed, and abnormalities can be detected. It has been when can straining One of or stop the operation, appropriate measures chance by calling the alarm.
- clogging of the intake filter 10 and fluctuation of the EGR rate due to clogging of the muffler 15 can be recognized, and maintenance can be performed. It is possible to appropriately judge when to perform.
- the EGR rate can be controlled so as to suppress the emissions of ⁇ .
- erroneous determination of the determination device 13 can be avoided by performing determination using a temporal average in consideration of the detection delay of the second temperature sensor 12, combustion variation of the diesel engine 1 0 0 is reduced, it is possible to satisfactorily suppress the emission of smoke and New Omicron chi.
- the recirculation exhaust gas is determined by the determination device 13 only when the engine load and the engine speed are stabilized. Since the amount is determined, it is possible to avoid combustion fluctuations during normal operation of the diesel engine 100.
- the cooling water temperature sensor 14 for detecting the cooling water temperature detects that the warm-up operation has been completed when the cooling water temperature has reached a predetermined temperature, and the diesel engine 100 Since the judgment by the judging device 13 is performed after the warm-up is sufficiently performed, it is possible to avoid a judgment operation in a cold state where it is difficult to make an appropriate judgment and to avoid a combustion fluctuation.
- the determination device determines that the EGR gas amount is abnormal when the detection value detected by the second temperature sensor 12 is not within a predetermined range from the temperature value on the map stored in the memory 19.
- the margin of this predetermined range is set to be smaller on the side where the detection value of the second temperature sensor 12 is higher than on the side where the detection value is lower, so that the emission of smoke is favorably suppressed. be able to.
- the cooling water temperature sensor 14 S is provided with correction means for correcting the temperature value stored in the memory 19 (storage means) with the detected temperature value in the cold state. also it is possible to secure the appropriate EGR rate, it is possible to reduce the volume of smoke and NO x.
- FIG. 1 is a schematic diagram of a diesel engine embodying the present invention.
- the engine load, the proper downstream temperature T 2 which changes in response to changes in engine speed 5 is a graph comparing an example of a value (standard mixed gas temperature T s) with an upstream temperature T.
- Figure 3 is a Darafu comparing 2 and changes the downstream temperature ⁇ the second temperature sensor was measured, and the correction gas mixture temperature Tm r a proper value of the downstream temperature on the map.
- FIG. 4 is a graph showing the relationship between the opening of the EGR valve and the engine load.
- Figure 5 is a graph showing the change in the downstream temperature T 2 with respect to load variation.
- Figure 6 is a graph comparing engine load fluctuations with downstream temperature.
- Figure 7 is a graph showing the relationship between the shaft average effective pressure and the engine speed for different EGR rates.
- Figure 8 is a graph showing the exhaust gas regulation allowable range, the relationship between the EGR rate of the diesel engine is limited by the allowable smoke amount and the allowable vo chi amount contained in the exhaust gas.
- Fig. 9 is a graph in which the corrected mixed gas temperature Tm r is further corrected in consideration of the cooling water temperature.
- FIG. 1 is a system schematic diagram of a diesel engine 100 in which the present invention (the inventions of claims 1 to 7) is implemented.
- an intake passage 3 that is provided with an intake filter 10 on the way and supplies air to a combustion chamber 17 in the engine body 1, and an exhaust passage 2 that discharges exhaust gas after combustion are provided. It is provided.
- a muffler 15 is provided in the exhaust passage 2.
- one end of the exhaust gas recirculation passage 4 is connected in the middle of the exhaust gas passage 2, and the other end of the exhaust gas recirculation passage 4 is connected to the intake passage 3 at the junction 9.
- the exhaust gas recirculation passage 4 is provided with an electromagnetic control type EGR valve 5 (throttle valve). By changing the opening of the EGR valve 5, the amount of exhaust gas (EGR gas) mixed with air at the junction 9 can be adjusted.
- EGR valve 5 throttle valve
- the diesel engine 100 is provided with a fuel injection pump 16 for supplying fuel to the combustion chamber 17.
- the fuel injection pump 16 is provided with an engine load detection sensor 6.
- the flywheel 18 is provided with an engine speed sensor 7.
- the engine body 1 is provided with a cooling water temperature detection sensor 14.
- the engine load detection sensor 6, the engine speed detection sensor 7, and the coolant temperature detection sensor 14 are each connected to a determination device 13 described later in detail by wiring.
- a first temperature sensor 11 is provided in the intake passage 3 between the intake filter 10 and the junction 9.
- a second temperature sensor 12 is provided downstream of the junction 9 of the intake passage 3.
- the detection signals detected by the first temperature sensor 11, the second temperature sensor 12, the engine load detection sensor 6, the engine speed detection sensor 7, and the cooling water temperature detection sensor 14 are respectively connected via wires. It is transmitted to the judgment device 13.
- the determination device 13 issues a command to the EGR control device 8 based on each of the input detection signals, and the EGR control device 8 adjusts the opening of the EGR valve 5 appropriately.
- the determination device 13 includes a CPU 20 and a memory 19 (storage means).
- the appropriate value of the appropriate mixed air (intake including EGR gas) temperature (hereinafter referred to as the downstream temperature) in the intake passage 3 on the side (where the second temperature sensor 12 is installed) has been determined in advance by experiments. .
- This is stored in the memory 19 as a map.
- the CPU 20 performs various calculations and determinations described later.
- the exhaust gas recirculation control device for the diesel engine 100 is configured.
- the engine load As an example of (standard mixed gas temperature T s below) were compared with the upstream temperature 1 ⁇ graph It is.
- the standard mixed gas temperature Ts is uniquely determined by the combination of the above-described engine load and engine speed as long as the diesel engine 100 is normal.
- the intake air temperature after mixing which is uniquely determined from the engine load and the engine speed in the standard state, is hereinafter referred to as a standard mixed gas temperature Ts.
- the target value of the downstream temperature obtained by correcting the standard mixed gas temperature T s by the upstream temperature 1 ⁇ detected by the first temperature sensor 11 is referred to as a corrected mixed gas temperature Tmr.
- the upstream temperature intake air temperature in the intake passage 3 upstream of the merging portion 9 of FIG. 1 T referred to as the intake air temperature in the intake passage 3 on the downstream side and the lower flow temperature T 2 of the merging portion 9.
- the determination device 13 determines the intake air temperature 1 before mixing with the exhaust gas (EGR gas) detected by the first temperature sensor 11, The temperature range on the map stored in the memory 19 corresponding to the combination of the engine load and the engine speed detected by the engine load detection sensor 6 and the engine speed detection sensor 7, respectively, and the second temperature sensor 12 the actual and the downstream temperature T 2 detected in to compare.
- EGR gas exhaust gas
- the target value of the downstream temperature is corrected by correcting the corrected mixed gas temperature Tmr with the upstream temperature 1 (the higher the upstream temperature 1, the higher the corrected mixed gas temperature Tmr, and conversely, the lower the upstream temperature 1, the corrected mixed gas temperature Tmr lower correction) was preferred to compare the positive mixed gas temperature Tm r capturing the corrected downstream temperature T 2.
- EGR gas amount is to be proper determination unit 13 determines. Conversely, if the downstream temperature ⁇ 2 force is smaller than the temperature range on the map, the EGR gas amount is insufficient, and if it is larger than the map temperature range, the EGR gas amount is excessive. 13 judges. In this case, it is preferable to notify the operator of the abnormality by turning on an alarm lamp or sounding a buzzer, for example. In such a case, the diesel engine 100 may be stopped depending on the use of the diesel engine 100.
- the determination device 13 determines that the EGR gas amount is small (the EGR rate is low)
- the determination device 13 controls the EGR control valve 8 so that the EGR gas amount becomes an appropriate amount.
- a command is issued to increase the opening of the EGR valve 5 (increase the EGR rate).
- the judging device 13 judges that the EGR gas amount is large (the EGR rate is high)
- the judging device 13 adjusts the opening of the EGR valve 5 with respect to the EGR control valve 8 so that the EGR gas amount becomes an appropriate amount. To reduce the EGR (lower the EGR rate). In this way, the opening of the EGR valve 5 is adjusted, and the EGR gas amount becomes an appropriate amount.
- the downstream temperature is also uniquely determined by adding the upstream temperature 1 detected by the first temperature sensor 11 to this. Then, the upstream temperature 1 ⁇ increases the exhaust gas temperature (EGR gas temperature) is also Noboru Ue, as a result, also increases downstream temperature T 2 of the second temperature sensor 12 detects. Therefore, the downstream temperature of the normal state to be compared with the downstream temperature T 2 detected by the second temperature sensor 1 2 (standard mixed gas temperature T s) is, for example, need to be corrected by the following equation (1). According to this equation (1), an appropriate EGR rate can be secured.
- Tmr T s + Tl " ⁇ ° ⁇ e xxEGR (D
- Tmr temperature of the mixed gas mixture
- T s temperature of the standard mixed gas gas
- the downstream temperature T 2 at the time t A is affected by the intake air temperature 1 and deviates from the allowable range based on the standard mixed gas temperature T s despite the normal state.
- the time t downstream temperature in A T 2 is provided within the proper range based on capturing the positive mixed gas temperature Tmr that is ToTadashi with the inlet air temperature 1 ⁇ , not unusual.
- the standard mixed gas temperature T s is determined in advance by experiments, but the standard mixed gas temperature T s is uniquely determined from the engine load and the engine speed. Furthermore, the standard mixed gas temperature T s changes following a change in the intake air temperature (upstream temperature 1 ⁇ ). This relationship is stored in the memory 19 in advance as the above equation (1).
- the downstream temperature T 2 the EGR gas amount is measured in the normal case, the transition in the region between the two thin lines (proper range). Conversely, when the downstream temperature T 2 deviates from between two thin lines, it is possible to EGR gas amount is determine the constant to be abnormal.
- Figure 3 is a Darafu comparing 2 and changes the downstream temperature ⁇ the second temperature sensor 1 2 was measured, a correction gas mixture temperature Tm r a proper value under flow temperature on the Matsupu.
- the upper and lower limits of the appropriate range of the downstream temperature are set with the corrected mixed gas temperature Tmr as the center.
- FIG. 4 is a graph showing the relationship between the opening of the EGR valve 5 and the engine load. Downstream temperature ⁇
- the map shift which is a fixed amount correction of the opening, is effective. It is effective to change the slope of the straight line in the graph against the change due to clogging of the intake filter 10 and the muffler 15.
- the temperature sensor itself has a heat capacity, so a response delay will inevitably occur.
- the third aspect of the invention deals with a response delay of the second temperature sensor 12 when the first and second aspects of the invention are implemented.
- the instruction 13 instructs the EGR control device 8 to correct the opening map of the EGR valve 5 each time, and the combustion may become unstable.
- the determination device 13 faithfully makes a determination based on the detection signal of the second temperature sensor 12, the EGR gas amount is abnormal when the actual EGR gas amount is already at an appropriate level. signal is input opening of the E GR valve 5 is changed as that, it is conceivable to further burn was Akui spoon to thereby discharge the smoke and NO x.
- the forward moving average method refers to, for example, the past four values (calculated values) A1 to A4 of the detection values detected by the engine load detection sensor 6 and the engine speed detection sensor 7, and the actual measurement value B5 Is substituted into equation (2) to obtain a calculated value A5, and the calculated value A5 is adopted in place of the actually measured value B5.
- A5 (Al + A2 + A3 + A4 + B5) / 5 (2)
- A6 is calculated by the following equation (3).
- A6 (A2 + A3 + A4 + A5 + B6) / 5 (3)
- the calculated values A1 to AX calculated in this way have smaller fluctuation ranges than the actually measured values B1 to BX.
- the calculated values A1 to AX with small fluctuations are adopted as signals to be judged by the judgment device 13 instead of the actually measured values B1 to BX, the combustion of the diesel engine 100 becomes stable, and even if the actually measured values B1 to BX are used. be outside the proper range toward the calculated value a 1 ⁇ AX is in the proper range, it is possible to reduce at the same time good good emissions of the NO x and smoke.
- Figure 5 is a graph showing the downstream temperature T 2 of Heni spoon against load variation.
- the output value of the second temperature sensor 12 (downstream temperature ⁇ 2 ) is calculated as shown in FIG.
- the problem caused by the fact that the actual EGR gas amount and the temperature detection by the second temperature sensor 12 do not correspond to the real time is caused by the engine speed detection signal in which the fluctuation range is suppressed by the forward moving average method and the engine speed detection signal.
- This can be solved by calculating the corrected mixed gas temperature Tmr from the load detection signal.
- the corrected mixed gas temperature Tm r calculated using the engine load detection signal and the engine speed detection signal input to the judgment device 13 is averaged in the same manner to suppress the fluctuation range, the response mixed delay may be reduced. Problems can be resolved.
- the effect of stabilizing combustion can be obtained. Further, assuming that the output of the second temperature sensor 12 is always delayed (for example, 1 second) from the output of the engine load detection signal or the engine speed detection signal, a predetermined time (For example, 1 second) Even just sending it can reduce the difference between the actual temperature and the detected temperature.
- the determination by the determination device 13 is performed when the combustion is relatively stable such as during idling operation.
- the operating conditions of diesel engines for automobiles tend to fluctuate rapidly (load fluctuations).
- Fig. 6 is a graph comparing engine load fluctuation with downstream temperature.
- the load fluctuation decreases after time t. Therefore, from time t to time t! During this period, the detection by each sensor is performed, and the determination by the determination device 13 is performed based on the detection.
- each sensor When the engine is cold (when the engine temperature is low, such as during warm-up operation), each sensor cannot perform normal detection. In such a case, for example, if the opening of the EGR valve 5 is changed, the appropriate value may be lost. Therefore, the determination by the determination device 13 is performed at a time other than a cold state and at a time when combustion is stable, as described below.
- Judging device 13 has a function to detect the completion of warm-up operation, and recognizes that diesel engine 100 has finished warm-up operation based on a signal input from cooling water temperature sensor 14. I do.
- the judging device 13 recognizes that the warm-up operation is completed, the judging device 13 further receives a detection signal from each detection sensor before starting the normal operation, and judges whether or not the EGR gas amount is appropriate.
- the determination is made at the time of the idling operation immediately after the completion of the warm-up operation.However, the determination is made before the operation of the diesel engine 100 is completed and the diesel engine 100 is stopped. It may be. (Example of the invention of claim 6)
- FIG. 7 is a graph showing the relationship between the shaft average effective pressure and the engine speed for different EGR rates. Further, FIG. 8 is a graph showing the emissions regulations tolerance is limited constant, the relationship between the EGR rate of the diesel engine 100 in tolerance amount of NO x and the allowable smoke amount contained in the exhaust gas.
- the EGR rate changes as shown in the EGR curve A within the allowable range of exhaust gas regulations (the area hatched in Fig. 8).
- the EGR rate may increase.
- the intake air amount of the diesel engine 100 itself decreases, and as a result, an oxygen deficiency state occurs.
- the EGR rate changes as indicated by the EGR curve B, and the EGR rate deviates from the allowable range of the exhaust gas earlier than the EGR curve A, and the smoke rapidly deteriorates.
- the side where the EGR rate is increased i.e. on the side downstream temperature T 2 is higher than the standard mixed gas temperature T mr, it is necessary to strictly determined level (margin).
- the degree of strictness depends on the engine load, but in the operating range where the engine load is high (about 50% to 100% of the rated value), set the EGR rate to about 50% on the decreasing side, and in the operating range where the engine load is low (Approximately 50% or less of the rating), it is preferable to set the value to about 80%, which is on the decreasing side of the EGR rate.
- the EGR rate decreases (EGR gas There when determining if lower downstream temperature T 2 than the positive mixed gas temperature Tm r catching on the map is actually measured by the second temperature sensor 12 on the side) is 30 ° C or higher is insufficient EGR abnormality
- EGR rate increase side a determining device 13 downstream temperature T 2 than the positive mixed gas temperature Tmr is actually measured by the second temperature sensor 12 catching on the map in (EGR gas amount excess side) is E GR abnormal the higher above 15 ° C is It is set so as to be determined.
- a low downstream temperature T 2 than correcting mixed gas temperature Tm r on the map in the EGR rate reduction side is measured by the second temperature sensor 12 is 3 0 ° C or higher E when determining that the GR abnormal, the higher the downstream temperature T 2 than the positive mixed gas temperature Tm catching on map actually measured by the second temperature sensor 12 is 24 ° C or higher in the E GR ratio increased side E As the judgment device 13 judges that GR is abnormal
- downstream temperature T 2 is if deviated more than the standard mixed gas temperature T s mosquito ⁇ Luo predetermined temperature, the determination unit 13 determines that is the abnormal state, for example, to to issue a warning, the diesel engine Take measures such as stopping 100. As a result, it is possible to suppress the discharge of both Sumo chromatography click and vo chi.
- Fig. 9 is a Daraf in which the temperature of the mixed gas mixture Tm r is further corrected in consideration of the cooling water temperature. Considering the cooling water temperature in the above equation (1), equation (4) (correction means) is obtained.
- Tmr T s + (T -T 0) xi; re x- a lx (T w 0 -Tw) x - ⁇ - ' ⁇ - ⁇ (4) here T. : Reference intake temperature ( ⁇ ), Tex: Reference exhaust temperature (K),
- Tw Current cooling water temperature
- a 1 Influence coefficient of cooling water temperature (depending on the engine, for example, 0.3 to 0.5) Diesel engine 100 power
- the engine load and engine speed fluctuate drastically, as shown in Fig. 6.
- the limited area is limited to the warm-up operation immediately after the engine is started.
- downstream temperature T 2 actually measured and corrected mixed gas temperature Tm r on the map, assuming those always deviate, adopted by correcting mixed-type without employing the equation (1) to (4) Calculate the gas temperature Tm r.
- the temperature of the exhaust gas is uniquely determined by the engine load and the engine speed. However, if the temperature of the passage on the way of the exhaust gas (EGR gas) is low, heat is taken away by the passage members, and the temperature of the EGR gas decreases. If the opening of the EGR valve 5 is set based on the lowered EGR gas temperature, accurate judgment cannot be made.
- the power during the warm-up operation is determined by monitoring the manner in which the cooling water temperature rises.
- the temperature of the passage member that has taken the heat of the exhaust gas (EGR gas) rises, the temperature of the cooling water also rises.
- EGR gas which was originally at 300 ° C., has dropped to 250 ° C. or has dropped to 200 ° C. If this is reflected in equation (4) and is calculated by the determination device 13, the corrected mixed gas temperature Tmr can be appropriately corrected.
- the exhaust gas recirculation control device according to the present invention is applicable to various diesel engines.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/559,618 US7201158B2 (en) | 2003-06-03 | 2004-05-28 | Exhaust gas recirculation control device for diesel engine |
CA002527943A CA2527943C (en) | 2003-06-03 | 2004-05-28 | Exhaust gas recirculation control device for diesel engine |
EP04735334A EP1630402A4 (en) | 2003-06-03 | 2004-05-28 | EXHAUST GAS RECIRCULATION CONTROL DEVICE FOR DIESEL ENGINE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-157841 | 2003-06-03 | ||
JP2003157841A JP3868926B2 (ja) | 2003-06-03 | 2003-06-03 | ディーゼル機関の排気ガス還流制御装置 |
Publications (1)
Publication Number | Publication Date |
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WO2004109088A1 true WO2004109088A1 (ja) | 2004-12-16 |
Family
ID=33508406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/007741 WO2004109088A1 (ja) | 2003-06-03 | 2004-05-28 | ディーゼル機関の排気ガス還流制御装置 |
Country Status (7)
Country | Link |
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US (1) | US7201158B2 (ja) |
EP (1) | EP1630402A4 (ja) |
JP (1) | JP3868926B2 (ja) |
KR (1) | KR100693655B1 (ja) |
CN (1) | CN100398805C (ja) |
CA (1) | CA2527943C (ja) |
WO (1) | WO2004109088A1 (ja) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2886887B1 (fr) * | 2005-06-09 | 2007-09-14 | Renault Sas | Dispositif de chauffage additionnel d'un vehicule automobile |
DE102007038727B4 (de) * | 2007-04-05 | 2015-04-09 | Continental Automotive Gmbh | Verfahren zur Bestimmung des Abgasanteils von einem Verbrennungsmotor zugeführten Mischgas |
JP4850801B2 (ja) * | 2007-09-07 | 2012-01-11 | トヨタ自動車株式会社 | 内燃機関装置およびこれを搭載する車両、内燃機関装置の制御方法 |
DE102007062097A1 (de) * | 2007-12-21 | 2009-06-25 | Mahle International Gmbh | Diagnoseverfahren für Zusatzventile |
US9062633B2 (en) * | 2009-08-01 | 2015-06-23 | Electro-Motive Diesel, Inc. | Pressure balanced exhaust gas recirculation assembly for a locomotive two-stroke uniflow scavenged diesel engine |
EP2562406B1 (en) * | 2010-04-22 | 2015-12-02 | Toyota Jidosha Kabushiki Kaisha | Abnormality detection device and abnormality detection method for egr system |
US9261052B2 (en) * | 2011-12-01 | 2016-02-16 | Toyota Jidosha Kabushiki Kaisha | Failure diagnosis apparatus of EGR system |
US9422877B2 (en) * | 2013-10-11 | 2016-08-23 | General Electric Company | System and method for control of exhaust gas recirculation (EGR) utilizing process temperatures |
FR3025838B1 (fr) * | 2014-09-15 | 2020-06-19 | Renault S.A.S | Procede de regulation de la consommation en air d'un moteur a combustion interne en vue de limiter une temperature de gaz brules recycles |
US9664129B2 (en) * | 2015-02-06 | 2017-05-30 | Ford Global Technologies, Llc | System and methods for operating an exhaust gas recirculation valve based on a temperature difference of the valve |
JP6528791B2 (ja) * | 2017-01-27 | 2019-06-12 | トヨタ自動車株式会社 | エンジンシステム |
US10473039B2 (en) * | 2017-02-06 | 2019-11-12 | Komatsu Ltd. | Exhaust purifying device and working vehicle |
CN110308005A (zh) * | 2019-06-12 | 2019-10-08 | 上海市环境科学研究院 | 柴油机尾气颗粒物产生系统及柴油机尾气颗粒物模拟方法 |
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JPS63134844A (ja) * | 1986-11-25 | 1988-06-07 | Nippon Denso Co Ltd | 排気ガス還流制御装置 |
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2003
- 2003-06-03 JP JP2003157841A patent/JP3868926B2/ja not_active Expired - Fee Related
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2004
- 2004-05-28 EP EP04735334A patent/EP1630402A4/en not_active Withdrawn
- 2004-05-28 CA CA002527943A patent/CA2527943C/en not_active Expired - Fee Related
- 2004-05-28 KR KR1020057022800A patent/KR100693655B1/ko not_active IP Right Cessation
- 2004-05-28 US US10/559,618 patent/US7201158B2/en not_active Expired - Fee Related
- 2004-05-28 CN CNB2004800153425A patent/CN100398805C/zh not_active Expired - Fee Related
- 2004-05-28 WO PCT/JP2004/007741 patent/WO2004109088A1/ja active Application Filing
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JPS55116101A (en) * | 1979-03-01 | 1980-09-06 | Nissan Motor Co Ltd | Signal processor |
JPS58197461A (ja) * | 1982-05-14 | 1983-11-17 | Nissan Motor Co Ltd | 排気還流装置のセンサ故障判別装置 |
JPS62162761A (ja) * | 1986-01-09 | 1987-07-18 | Nippon Denso Co Ltd | 排気ガス還流制御装置 |
JPS6338678A (ja) * | 1986-08-05 | 1988-02-19 | Nissan Motor Co Ltd | 排気還流装置の故障診断装置 |
JPS63259148A (ja) * | 1987-04-15 | 1988-10-26 | Mitsubishi Motors Corp | 排気還流装置の故障検出方法 |
JP2002256982A (ja) * | 2000-12-26 | 2002-09-11 | Toyota Motor Corp | 排気還流装置の異常診断装置 |
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See also references of EP1630402A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1630402A1 (en) | 2006-03-01 |
EP1630402A4 (en) | 2012-08-15 |
US7201158B2 (en) | 2007-04-10 |
JP2004360516A (ja) | 2004-12-24 |
KR100693655B1 (ko) | 2007-03-14 |
CN1798917A (zh) | 2006-07-05 |
KR20060032956A (ko) | 2006-04-18 |
CA2527943A1 (en) | 2004-12-16 |
CN100398805C (zh) | 2008-07-02 |
CA2527943C (en) | 2007-12-18 |
JP3868926B2 (ja) | 2007-01-17 |
US20060144374A1 (en) | 2006-07-06 |
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