WO2009133737A1 - エンジンの燃料噴射制御装置 - Google Patents
エンジンの燃料噴射制御装置 Download PDFInfo
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- WO2009133737A1 WO2009133737A1 PCT/JP2009/055792 JP2009055792W WO2009133737A1 WO 2009133737 A1 WO2009133737 A1 WO 2009133737A1 JP 2009055792 W JP2009055792 W JP 2009055792W WO 2009133737 A1 WO2009133737 A1 WO 2009133737A1
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- injection
- amount
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- cylinder
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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
- F02D41/008—Controlling each cylinder individually
- F02D41/0085—Balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio
-
- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1497—With detection of the mechanical response of the engine
- F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
-
- 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 has a plurality of cylinders, and performs fuel injection control for an engine that performs main injection and sub-injection performed before or after the main injection in each cycle for each cylinder. It relates to the device.
- a difference in fuel injection amount may occur between cylinders due to individual differences in fuel injection devices (injectors) provided in each cylinder, aging deterioration, or the like. is there.
- the difference in the fuel injection amount between the cylinders appears as fluctuations in the engine rotation speed at which the engine rotation speed when combustion is performed in each cylinder varies from cylinder to cylinder.
- the fuel injection quantity between cylinders can be reduced by increasing or decreasing the fuel injection quantity for each cylinder in accordance with fluctuations in engine rotation speed between cylinders. Correction is performed (see Patent Document 1).
- the basic injection amount of main injection and the basic injection amount of sub-injection (pilot injection, post injection) depending on the operating state of the engine And calculating an inter-cylinder correction amount for increasing / decreasing the fuel injection amount in each cylinder according to the deviation of the engine rotation speed detected between the cylinders, (Correction A) By distributing the inter-cylinder correction amount of each cylinder to the main injection and the sub-injection according to the main injection amount and the basic injection amount of the sub-injection, the fuel injection amount (main injection, sub-injection between the cylinders) ), Or (Correction B) By correcting the inter-cylinder correction amount of each cylinder to the basic injection amount of the main injection, the fuel injection amount (only main injection) is corrected between the cylinders.
- the fuel injection amount of the pilot injection greatly increases or decreases due to the inter-cylinder correction when pilot injection is performed in order to reduce combustion noise in the middle / high load region of the engine.
- the effect of reducing combustion noise by pilot injection is greatly affected, which may increase combustion noise or deteriorate exhaust gas performance.
- the inter-cylinder correction is performed as in the above-described correction B
- post injection is performed for regeneration (catalyst activation) of the diesel particulate removing device (post-processing device) in the low load region of the engine
- the cylinder The fuel injection amount of the main injection is greatly reduced by the interval correction, the combustion in the main injection ends before starting the post injection, the combustion in the post injection is misfired, and the regeneration of the aftertreatment device (activation of the catalyst) It may not be possible to increase the temperature to the required temperature.
- an object of the present invention is to prevent a sudden change in the fuel injection amount of each of the main injection and the sub-injection due to the correction between cylinders, thereby preventing an increase in combustion noise and a deterioration in exhaust gas performance, and post-processing.
- An object of the present invention is to provide a fuel injection control device for an engine that can prevent a decrease in temperature rise performance of the device.
- the present invention has a plurality of cylinders, and in each cycle, the main injection and the sub-injection performed before or after the main injection are performed for each cylinder.
- the cylinder-to-cylinder correction amount calculation means to calculate, and the above-mentioned cylinder-to-cylinder correction amount are increased only for the first divided cylinder correction amount for increasing or decreasing the main injection and sub-injection basic injection amounts, and the main injection basic injection amount.
- the inter-cylinder correction amount dividing means for dividing the correction amount into the second divided cylinder correction amount for correction, and the first divided inter-cylinder correction amount according to the main injection amount and the basic injection amount of the sub injection, First correction means for distributing to the sub-injection, and second correction means for adding the second inter-cylinder correction amount to the basic injection amount of the main injection amount are provided.
- a ratio changing means for changing the ratio of the correction amount between the first divided cylinders and the correction amount between the divided second cylinders according to the operating state of the engine.
- the ratio changing means decreases the ratio of the correction amount between the first divided cylinders in the correction amount between the cylinders, and corrects the correction between the second divided cylinders in the correction amount between the cylinders.
- the ratio between the correction amount between the first divided cylinders and the correction amount between the second divided cylinders may be changed so that the ratio of the amount increases.
- the sub-injection may be a relatively small amount of pilot injection that is performed prior to the main injection in order to suppress rapid initial combustion due to a relatively large amount of main injection.
- an aftertreatment device having a catalyst disposed in the exhaust passage of the engine is provided, and the sub-injection is performed after the main injection so as to increase the temperature of the exhaust gas and activate the catalyst of the aftertreatment device.
- Post injection may be used.
- the present invention by suppressing the sudden change in the fuel injection amount of each of the main injection and the sub-injection due to the correction between the cylinders, it is possible to prevent an increase in combustion noise and a deterioration in exhaust gas performance, and It exhibits an excellent effect that the temperature rise performance can be prevented from being lowered.
- FIG. 1 is a block diagram showing an embodiment of an engine fuel injection control apparatus according to the present invention.
- FIGS. 2A and 2B are time charts showing final injection amounts of main injection and sub-injection.
- FIG. 1 is a block diagram showing an embodiment of an engine fuel injection control apparatus according to the present invention.
- the engine of the present embodiment is a multi-cylinder diesel engine having a plurality of cylinders
- the fuel injection control device 1 performs a fuel injection by a fuel injection device (injector) in one cycle, the main injection
- a multi-stage fuel injection mode is performed for each cylinder divided into a plurality of times of sub-injection (pilot injection) performed prior to injection and sub-injection (post-injection) performed after main injection (FIG. 2). reference).
- a relatively small amount of pilot injection performed prior to the main injection suppresses rapid initial combustion and rapid increase in in-cylinder pressure due to a relatively large amount of main injection, thereby suppressing NOx generation and combustion noise.
- the post-injection performed after the main injection can raise the temperature of the exhaust gas and sufficiently activate the catalyst of the aftertreatment device.
- the fuel injection control device 1 includes an engine operation state detection unit 2 that detects an operation state of the engine based on an engine speed, an accelerator opening, and the like, and an engine operation detected by the engine operation state detection unit 2.
- the main basic injection amount calculating means 3 for calculating the basic injection amount of the main injection according to the state, and each sub-injection (pilot injection, post-injection) according to the engine operating state detected by the engine operating state detecting means 2
- Sub-basic injection amount calculation means 4 for calculating the basic injection amount of the engine, and an inter-cylinder correction amount for increasing / decreasing the fuel injection amount in each cylinder according to the deviation of the engine speed between the cylinders.
- Inter-cylinder correction amount calculation means 5 is provided.
- the fuel injection control device 1 is configured so that the inter-cylinder correction amount calculation unit 5 calculates the inter-cylinder correction amount between the first divided cylinders for increasing / decreasing the basic injection amount of the main injection and the sub injection.
- the inter-cylinder correction amount dividing means 6 that divides the correction amount into the second divided cylinder correction amount for increasing / decreasing only the basic injection amount of the main injection, and the first division divided by the inter-cylinder correction amount dividing means 6
- the first correction means 7 that distributes the correction amount between cylinders to the main injection and the sub injection according to the main injection amount and the basic injection amount of the sub injection, and the second divided cylinder divided by the inter-cylinder correction amount dividing means 6
- a second correction means 8 for adding the correction amount to the basic injection amount of the main injection amount.
- the first correction means 7 has a correction coefficient calculation means 9 for calculating a correction coefficient based on the basic injection amounts of the main injection and each sub-injection and the first inter-cylinder correction amount. Specifically, the correction coefficient calculation means 9 divides the sum of the basic injection amount of the main injection and each sub-injection and the correction amount between the first divided cylinders by the sum of the basic injection amount of the main injection and each sub-injection. The correction coefficient is calculated. The first correction means 7 multiplies the basic injection amount of the main injection by a correction coefficient and multiplies the basic injection amount of each sub-injection by the correction coefficient so as to correct the increase / decrease in the basic injection amount of the main injection and the sub-injection. It has become.
- the fuel injection control device 1 sets the ratio between the first divided cylinder correction amount and the second divided cylinder correction amount in accordance with the engine operating state detected by the engine operating state detecting means 2.
- a ratio changing means 10 for changing is provided.
- the ratio changing unit 10 includes a transition coefficient calculating unit 11 that calculates a transition coefficient used when the inter-cylinder correction amount is divided into the first divided cylinder correction amount and the second divided cylinder correction amount. ing.
- the ratio of the correction amount between the first divided cylinders in the inter-cylinder correction amount of each cylinder decreases and the transition coefficient occupies the inter-cylinder correction amount of each cylinder.
- the ratio of the correction amount between the second divided cylinders is set to be large.
- the ratio changing means 10 is configured to change the ratio between the first divided cylinder correction amount and the second divided cylinder correction amount in accordance with the transition coefficient.
- the final injection amount of the main injection depends on the basic injection amount of the main injection
- the correction amount between the first divided cylinders depends on the basic injection amounts of the main injection and the sub injection. It is obtained by adding the distributed correction amount and the correction amount between the second divided cylinders, and the final injection amount of the sub injection is the basic injection amount of the sub injection, and the correction amount between the first divided cylinders is the main injection and the sub injection. This is determined by adding the correction amount distributed according to the basic injection amount.
- the main basic injection amount calculation means The basic injection amount of the main injection calculated by 3 is determined as it is as the final injection amount of the main injection, and the basic injection amount of the sub injection calculated by the sub basic injection amount calculation means 4 is determined as it is as the final injection amount of the sub injection. .
- the ratio of the correction amount between the first divided cylinders in the correction amount between the cylinders of each cylinder is reduced by the above transition coefficient (the ratio of the correction amount between the second divided cylinders is increased), Since the correction amount of the basic injection amount of the sub-injection is smaller than that in the low load region, the fuel injection amount of the pilot injection does not greatly increase or decrease due to the inter-cylinder correction, and the effect of reducing the combustion noise by the pilot injection Therefore, it is possible to avoid the increase in combustion noise or the deterioration of exhaust gas performance.
- the inter-cylinder correction amount is not divided into the first divided cylinder correction amount and the second divided cylinder correction amount, and all the inter-cylinder correction amounts are set according to the main injection amount and the basic injection amount of the sub injection. And the correction amount of the basic injection amount of the sub-injection is smaller than that in the case of distributing to the sub-injection.
- the ratio of the correction amount between the first divided cylinders in the correction amount between the cylinders of each cylinder increases due to the above transition coefficient (the ratio of the correction amount between the second divided cylinders decreases)
- the correction amount of the basic injection amount of the main injection is smaller than that in the middle / high load region, the fuel injection amount of the main injection is not greatly reduced by the correction between the cylinders, and before the post injection is started.
- the inter-cylinder correction amount is not divided into the first sub-cylinder correction amount and the second sub-cylinder correction amount. The correction amount of the basic injection amount of injection becomes small.
- the fuel injection of each of the main injection and the sub injection by the correction between the cylinders can be suppressed, and an increase in combustion noise and deterioration in exhaust gas performance can be prevented, and a decrease in temperature rise performance of the aftertreatment device can be prevented.
Abstract
Description
(補正A)各気筒の気筒間補正量を、メイン噴射量及びサブ噴射の基本噴射量に応じて、メイン噴射及びサブ噴射に分配することで、気筒間で燃料噴射量(メイン噴射、サブ噴射)の補正を行い、或いは、
(補正B)各気筒の気筒間補正量を全てメイン噴射の基本噴射量に加えることで、気筒間で燃料噴射量(メイン噴射のみ)の補正を行っている。
2 エンジン運転状態検出手段
3 メイン基本噴射量算出手段
4 サブ基本噴射量算出手段
5 気筒間補正量算出手段
6 気筒間補正量分割手段
7 第一補正手段
8 第二補正手段
9 補正係数算出手段
10 割合変化手段
11 遷移係数算出手段
Claims (5)
- 複数の気筒を有し、1サイクル中で、メイン噴射、及び、メイン噴射の前に行われ或いはメイン噴射の後に行われるサブ噴射を上記各気筒毎に実施するエンジンの燃料噴射制御装置であって、
上記エンジンの運転状態に応じて、メイン噴射の基本噴射量を算出するメイン基本噴射量算出手段と、
上記エンジンの運転状態に応じて、サブ噴射の基本噴射量を算出するサブ基本噴射量算出手段と、
上記各気筒間のエンジン回転速度の偏差に応じて、上記各気筒における燃料噴射量を増減補正する気筒間補正量を上記各気筒毎に算出する気筒間補正量算出手段と、
上記気筒間補正量を、メイン噴射及びサブ噴射の基本噴射量を増減補正するための第一分割気筒間補正量と、メイン噴射の基本噴射量のみを増減補正するための第二分割気筒間補正量とに分割する気筒間補正量分割手段と、
上記第一分割気筒間補正量を、メイン噴射量及びサブ噴射の基本噴射量に応じて、メイン噴射及びサブ噴射に分配する第一補正手段と、
上記第二分割気筒間補正量を、メイン噴射量の基本噴射量に加算する第二補正手段と、 を備えたことを特徴とするエンジンの燃料噴射制御装置。 - 上記第一分割気筒間補正量と上記第二分割気筒間補正量との割合を上記エンジンの運転状態に応じて変化させる割合変化手段を備える請求項1に記載のエンジンの燃料噴射制御装置。
- 上記割合変化手段は、上記エンジンの負荷が高くなるに従い、上記気筒間補正量に占める第一分割気筒間補正量の割合が小さくなり、上記気筒間補正量に占める第二分割気筒間補正量の割合が大きくなるように、上記第一分割気筒間補正量と上記第二分割気筒間補正量との割合を変化させる請求項2に記載のエンジンの燃料噴射制御装置。
- 上記サブ噴射が、比較的多量のメイン噴射による急激な初期燃焼を抑制すべく、メイン噴射に先立って行われる比較的少量のパイロット噴射である請求項1から3のいずれかに記載のエンジンの燃料噴射制御装置。
- エンジンの排気通路に配設された触媒を有する後処理装置を備え、
上記サブ噴射が、排気ガスの温度を高めて上記後処理装置の触媒を活性化させるべく、上記メイン噴射の後に行われるポスト噴射である請求項1から3のいずれかに記載のエンジンの燃料噴射制御装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2009801149684A CN102016277B (zh) | 2008-04-28 | 2009-03-24 | 发动机的燃料喷射控制装置 |
US12/989,709 US8596245B2 (en) | 2008-04-28 | 2009-03-24 | Fuel injection control device of engine |
EP09738674.2A EP2290212B1 (en) | 2008-04-28 | 2009-03-24 | Fuel injection controller of engine |
AU2009241109A AU2009241109B2 (en) | 2008-04-28 | 2009-03-24 | Fuel injection controller of engine |
Applications Claiming Priority (2)
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JP2008-116948 | 2008-04-28 | ||
JP2008116948A JP5245517B2 (ja) | 2008-04-28 | 2008-04-28 | エンジンの燃料噴射制御装置 |
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WO2009133737A1 true WO2009133737A1 (ja) | 2009-11-05 |
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PCT/JP2009/055792 WO2009133737A1 (ja) | 2008-04-28 | 2009-03-24 | エンジンの燃料噴射制御装置 |
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US (1) | US8596245B2 (ja) |
EP (1) | EP2290212B1 (ja) |
JP (1) | JP5245517B2 (ja) |
CN (1) | CN102016277B (ja) |
AU (1) | AU2009241109B2 (ja) |
WO (1) | WO2009133737A1 (ja) |
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DE102014202121A1 (de) * | 2014-02-06 | 2015-08-06 | Robert Bosch Gmbh | Verfahren zur Bestimmung von Kraftstoffmengen bei einer Direkteinspritzung eines Kraftfahrzeugs |
JP6307971B2 (ja) * | 2014-03-27 | 2018-04-11 | 株式会社デンソー | 燃料噴射制御装置 |
JP6269442B2 (ja) * | 2014-10-30 | 2018-01-31 | トヨタ自動車株式会社 | 内燃機関 |
JP6098613B2 (ja) * | 2014-10-30 | 2017-03-22 | トヨタ自動車株式会社 | 内燃機関 |
US10774771B2 (en) * | 2016-03-04 | 2020-09-15 | Ge Global Sourcing Llc | Engine control system for reducing particulate matter |
WO2019163477A1 (ja) * | 2018-02-26 | 2019-08-29 | 日立オートモティブシステムズ株式会社 | 燃料噴射制御装置、燃料噴射制御方法 |
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- 2008-04-28 JP JP2008116948A patent/JP5245517B2/ja not_active Expired - Fee Related
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2009
- 2009-03-24 US US12/989,709 patent/US8596245B2/en active Active
- 2009-03-24 AU AU2009241109A patent/AU2009241109B2/en not_active Ceased
- 2009-03-24 EP EP09738674.2A patent/EP2290212B1/en not_active Not-in-force
- 2009-03-24 WO PCT/JP2009/055792 patent/WO2009133737A1/ja active Application Filing
- 2009-03-24 CN CN2009801149684A patent/CN102016277B/zh active Active
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Publication number | Publication date |
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CN102016277B (zh) | 2013-08-28 |
EP2290212B1 (en) | 2018-08-08 |
EP2290212A4 (en) | 2015-10-14 |
JP2009264314A (ja) | 2009-11-12 |
EP2290212A1 (en) | 2011-03-02 |
AU2009241109B2 (en) | 2012-08-23 |
JP5245517B2 (ja) | 2013-07-24 |
US8596245B2 (en) | 2013-12-03 |
US20110040474A1 (en) | 2011-02-17 |
CN102016277A (zh) | 2011-04-13 |
AU2009241109A1 (en) | 2009-11-05 |
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