EP1106813A2 - Verfahren zur Bestimmung des Massenstroms eines Gasgemisches - Google Patents
Verfahren zur Bestimmung des Massenstroms eines Gasgemisches Download PDFInfo
- Publication number
- EP1106813A2 EP1106813A2 EP00124703A EP00124703A EP1106813A2 EP 1106813 A2 EP1106813 A2 EP 1106813A2 EP 00124703 A EP00124703 A EP 00124703A EP 00124703 A EP00124703 A EP 00124703A EP 1106813 A2 EP1106813 A2 EP 1106813A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- mass flow
- intake manifold
- manifold vacuum
- dependent
- tank ventilation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000000203 mixture Substances 0.000 title claims abstract description 7
- 230000001419 dependent effect Effects 0.000 claims abstract description 16
- 238000009423 ventilation Methods 0.000 claims description 19
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 230000004913 activation Effects 0.000 claims description 5
- 238000013022 venting Methods 0.000 abstract 1
- 101150115672 DPS1 gene Proteins 0.000 description 3
- 101150053419 dps2 gene Proteins 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 108010014172 Factor V Proteins 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Images
Classifications
-
- 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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
-
- 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
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0045—Estimating, calculating or determining the purging rate, amount, flow or concentration
-
- 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
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
- F02D41/0042—Controlling the combustible mixture as a function of the canister purging, e.g. control of injected fuel to compensate for deviation of air fuel ratio when purging
Definitions
- the invention relates to a method for determining the Mass flow of a gas mixture according to the generic term of Claim 1.
- an internal combustion engine is included Tank ventilation system and a method for controlling the Tank vent valve known.
- the control signal of a Tank vent valve is preferably a pulse width modulated signal, its duty cycle and its period or control frequency depending on the operating parameters of the internal combustion engine, such as. B. the Speed, are variably specifiable.
- Evaporated fuel in the tank must not be burned to the environment be delivered. Therefore, the gas mixture of air and evaporated Fuel usually from an activated carbon store through the electronic controllable tank ventilation valve into the intake manifold and further into the Combustion chamber of the internal combustion engine. Despite this additional Gas mixture supply from the tank ventilation system should be as little as possible Deviation from the current load and speed-dependent optimal target fuel-air mixture for the combustion process in the cylinders occur. Therefore, a precise knowledge of the mass flow from the Tank ventilation system required.
- a stored in the control unit is complete open tank ventilation valve maximum mass flow depending on current intake manifold vacuum specified.
- the current one Mass flow is determined by an algorithm in the control unit, at one of the coulters depending on the activation time of the tank ventilation valve of straight lines with the control frequency of the control signal and with the maximum mass flow is multiplied.
- the straight lines are through from Slope factors dependent on the intake manifold vacuum and by the Suction pipe vacuum dependent offset values defined.
- the family of straight lines is replaced by a Straight line equation
- the set of straight lines specified by a map.
- the maximum mass flow m ⁇ maX through the tank ventilation system is first empirically determined at a duty cycle of 100% and stored in the control unit.
- the current to be determined mass flow m ⁇ is related to this maximum mass flow m ⁇ max.
- By multiplying the ratio of the instantaneous mass flow m ⁇ is the maximum mass flow m ⁇ max with the period duration (or 1 / driving frequency) is an independent of the driving frequency of the drive signal normalized mass pulse value m is m Max 1 ⁇ generated. As shown in Fig.
- this mass pulse value m is m Max 1 ⁇ plotted over the activation time T of the tank ventilation valve by a family of straight lines (A, B) dependent on the intake manifold vacuum dps.
- A, B the two straight lines A (for a suction pipe negative pressure value dps2) and B (for a suction pipe negative pressure value dps1) are shown only as an example, dps1 being smaller than dps2.
- a large number of straight lines can be specified.
- the respective offset value b (b A , b B ) and the respective gradient factor a (a A , a B ) of the straight line (A, B) depend on the intake manifold vacuum dps (dps1, dps2) as parameters.
- the influence of the intake manifold vacuum on the time behavior of the gas column in the tank ventilation system is taken into account.
- Intake manifold vacuum dps either the sole intake manifold vacuum or also the differential pressure between the intake manifold vacuum and the Ambient pressure is to be understood, which is preferably by means of a Pressure sensor is measured on the intake manifold.
- the intake manifold vacuum or the differential pressure dps is the input signal of a mass flow characteristic 1, an offset characteristic 2 and a gradient characteristic 3.
- the characteristics 1, 2, 3 are determined empirically and stored in the control unit.
- the mass flow characteristic 1 specifies the maximum mass flows m ⁇ max when the tank ventilation valve is fully open, depending on the current intake manifold vacuum dps.
- the offset characteristic curve 2 specifies the offset values b (b A , b B ) depending on the intake manifold vacuum dps and the gradient characteristic curve 3 specifies the gradient factors a (a A , a B ) dependent on the intake manifold vacuum pressure dps.
- the pulse duty factor V and the period 1 / f of the pulse-width-modulated control signal are input signals of a conversion unit 4.
- the control time T of the tank ventilation valve is determined from the pulse duty factor V and the period duration 1 / f.
- the respectively given gradient factor a is multiplied at a first multiplication point by this actuation period T of the tank ventilation valve.
- This product is then added to the respective offset value b at a summing point.
- the output signal of the summing point is divided by the period 1 / f at a quotient formation point.
- the output signal of the quotient formation point is finally multiplied by the maximum mass flow m ⁇ max at a second multiplication point.
- the result is an exact determination of the mass flow m ⁇ actual .
- the accuracy of the method can be optimized by a large number of reference points in the characteristic curves.
- the offset characteristic curve 2, the slope characteristic curve 3, the summing point and the first multiplication point are combined in FIG. 2 as arithmetic unit 5.
- Computing unit 5 also a map representing the family of straight lines be used.
- the method according to the invention is invertible, so that the algorithm can also be used to control the mass flow.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Flow Control (AREA)
Abstract
Description
- a
- der Steigungsfaktor,
- b
- der Offsetwert,
- T
- die Ansteuerzeit,
- (a × T + b)
- die Geradengleichung
- f
- die Ansteuerfrequenz des Ansteuersignals,
- m ˙ ist
- der zu bestimmende Ist-Massenstrom und
- m ˙ max
- der maximale Massenstrom bei vollständig geöffnetem Ventil
- Fig. 1
- eine von der Ansteuerzeit abhängige Schar von Geraden mit vom Saugrohrunterdruck abhängigen Steigungsfaktoren und Offsetwerten, und
- Fig. 2
- den erfindungsgemäßen Algorithmus in Form eines Blockschaltbildes
Claims (3)
- Verfahren zur Bestimmung des Massenstroms eines Gasgemisches, das von einer Tankentlüftungsanlage in den Brennraum einer Brennkraftmaschine geführt wird, mittels eines elektronischen Steuergerätes abhängig vom momentanen Saugrohrunterdruck und abhängig vom Ansteuersignal des Tankentlüftungsventils, dadurch gekennzeichnet, daß ein im Steuergerät abgespeicherter, bei vollständig geöffnetem Tankentlüftungsventil maximaler Massenstrom (m ˙ maX) abhängig vom momentanen Saugrohrunterdruck (dps) vorgegeben wird und daß der momentane Massenstrom (m ˙ ist) durch einen Algorithmus im Steuergerät bestimmt wird, bei dem eine von der Ansteuerzeit (T) des Tankentlüftungsventils abhängige Schar von Geraden, die durch vom Saugrohrunterdruck (dps) abhängige Steigungsfaktoren (a) und durch vom Saugrohrunterdruck (dps) abhängige Offsetwerte (b) definiert sind, mit der Ansteuerfrequenz (f) des Ansteuersignals und mit dem maximalen Massenstrom (m ˙ max) multipliziert wird.
- Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, daß die Schar von Geraden durch die Geradengleichung (ax T + b) vorgegeben wird, wobei
- a
- der Steigungsfaktor einer Gerade,
- b
- der Offsetwert einer Gerade und
- T
- die Ansteuerzeit des Ansteuersignals
- Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, daß die Schar von Geraden durch ein Kennfeld vorgegeben wird.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19959660 | 1999-12-10 | ||
| DE19959660A DE19959660C1 (de) | 1999-12-10 | 1999-12-10 | Verfahren zur Bestimmung des Massenstroms eines Gasgemisches |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1106813A2 true EP1106813A2 (de) | 2001-06-13 |
| EP1106813A3 EP1106813A3 (de) | 2003-05-14 |
| EP1106813B1 EP1106813B1 (de) | 2004-03-24 |
Family
ID=7932195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00124703A Expired - Lifetime EP1106813B1 (de) | 1999-12-10 | 2000-11-11 | Verfahren zur Bestimmung des Massenstroms eines Gasgemisches |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1106813B1 (de) |
| DE (2) | DE19959660C1 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005008047A1 (de) * | 2003-07-11 | 2005-01-27 | Robert Bosch Gmbh | Vorrichtung und verfahren zur bestimmung des massenstromes über das tankenlüftungsventil für eine verbrennungskraftmaschine |
| CN108981830A (zh) * | 2017-05-31 | 2018-12-11 | 罗伯特·博世有限公司 | 用于计算质量流的方法 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10335902B4 (de) * | 2003-08-06 | 2015-12-31 | Robert Bosch Gmbh | Verfahren zur Tankentlüftung bei einer Brennkraftmaschine |
| DE102005018272B4 (de) * | 2005-04-20 | 2019-10-31 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Betreiben einer Brennkraftmaschine |
| DE102018112487A1 (de) * | 2018-05-24 | 2019-11-28 | Volkswagen Aktiengesellschaft | Verfahren zum Betreiben eines Antriebssystems eines Kraftfahrzeugs, Antriebssystem und Kraftfahrzeug |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4319772A1 (de) | 1993-06-15 | 1994-12-22 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Steuern einer Tankentlüftungsanlage |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3813220C2 (de) * | 1988-04-20 | 1997-03-20 | Bosch Gmbh Robert | Verfahren und Einrichtung zum Stellen eines Tankentlüftungsventiles |
| JPH0533733A (ja) * | 1991-05-20 | 1993-02-09 | Honda Motor Co Ltd | 内燃エンジンの蒸発燃料制御装置 |
| JP3154324B2 (ja) * | 1996-05-15 | 2001-04-09 | トヨタ自動車株式会社 | 内燃機関の蒸発燃料処理装置 |
| DE19701353C1 (de) * | 1997-01-16 | 1998-03-12 | Siemens Ag | Verfahren zur Tankentlüftung bei einer Brennkraftmaschine |
| DE19740969B4 (de) * | 1997-04-01 | 2010-05-20 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Brennkraftmaschine und Brennkraftmaschine |
| DE19756619B4 (de) * | 1997-04-01 | 2007-03-15 | Robert Bosch Gmbh | System zum Betreiben einer Brennkraftmaschine insbesondere für ein Kraftfahrzeug |
-
1999
- 1999-12-10 DE DE19959660A patent/DE19959660C1/de not_active Expired - Lifetime
-
2000
- 2000-11-11 DE DE50005783T patent/DE50005783D1/de not_active Expired - Fee Related
- 2000-11-11 EP EP00124703A patent/EP1106813B1/de not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4319772A1 (de) | 1993-06-15 | 1994-12-22 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Steuern einer Tankentlüftungsanlage |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005008047A1 (de) * | 2003-07-11 | 2005-01-27 | Robert Bosch Gmbh | Vorrichtung und verfahren zur bestimmung des massenstromes über das tankenlüftungsventil für eine verbrennungskraftmaschine |
| US7347193B2 (en) | 2003-07-11 | 2008-03-25 | Robert Bosch Gmbh | Method and device for determining the mass flow rate passing through the air-bleed valve of an internal combustion engine tank |
| CN108981830A (zh) * | 2017-05-31 | 2018-12-11 | 罗伯特·博世有限公司 | 用于计算质量流的方法 |
| CN108981830B (zh) * | 2017-05-31 | 2023-06-27 | 罗伯特·博世有限公司 | 用于计算质量流的方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19959660C1 (de) | 2001-07-05 |
| EP1106813A3 (de) | 2003-05-14 |
| DE50005783D1 (de) | 2004-04-29 |
| EP1106813B1 (de) | 2004-03-24 |
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