EP1315892A1 - Mixture adaptation method - Google Patents
Mixture adaptation methodInfo
- Publication number
- EP1315892A1 EP1315892A1 EP01962669A EP01962669A EP1315892A1 EP 1315892 A1 EP1315892 A1 EP 1315892A1 EP 01962669 A EP01962669 A EP 01962669A EP 01962669 A EP01962669 A EP 01962669A EP 1315892 A1 EP1315892 A1 EP 1315892A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- internal combustion
- combustion engine
- control
- engine
- fuel metering
- 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
Classifications
-
- 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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
-
- 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
-
- 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
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0606—Fuel temperature
Definitions
- the invention aims to compensate for the temperature-related mismatches which cannot be observed when the engine is warm.
- compensation is made for: • mismatches in the pilot control of a fuel metering for an internal combustion engine
- At least one correction variable is formed from the behavior of the control at high temperatures of the internal combustion engine, which also influences the fuel metering at low temperatures of the internal combustion engine in addition to the superimposed control to compensate for the mismatches, and at low temperatures
- Another measure provides that the deviation of an average control variable frm from the value 1 is integrated at comparatively low engine temperatures T in order to form the further correction variable (frat).
- the integration takes place at engine temperatures T from a temperature interval TMN ⁇ T ⁇ TMX.
- TMN as the lower interval limit is 10-30, in particular 20 ° Celsuis and TMX as the upper interval limit corresponds to the temperature at which the conventional adaptation is activated.
- TMX is approximately 70 ° Celsius.
- a further embodiment provides that the one further correction quantity, which acts on the fuel metering in such a way that its effect is greater at low temperatures of the internal combustion engine than at high temperatures of the internal combustion engine, depending on the engine temperature, so that it changes at high temperatures no differences to the known adaptation when the engine is warm.
- the output frak of the integrator is linked with a temperature-dependent variable ftk in such a way that the result of the linking becomes smaller with increasing temperature.
- the temperature-dependent variable ftk can form a multiplicative correction which varies between zero and one, the value zero being obtained when the engine is warm.
- the correction can vary continuously between these extreme values.
- the integration speed can take place as a function of values for the load and speed of the motor.
- the invention is also directed to an electronic control device for carrying out the methods and embodiments specified above.
- the normal mixture adaptation is active at high engine temperature, it learns, among other things. the density of the fuel. At low temperatures, the fuel has a higher density than at high temperatures and the pilot control adapted at high temperatures is no longer correct.
- the invention eliminates this disadvantage by the additional adaptation of the pilot control at low temperature.
- FIG. 1 shows the technical environment of the invention.
- FIG. 2 illustrates the formation of a fuel metering signal on the basis of the signals from FIG. 1 and
- FIG. 3 discloses the formation of an intervention according to the invention in the formation of the Fuel metering signal in the form of functional blocks as an embodiment of the invention.
- FIG. 1 in FIG. 1 represents an internal combustion engine with an intake manifold 2, an exhaust pipe 3, a fuel metering device 4, sensors 5-8 for operating parameters of the engine and a control unit 9.
- the fuel metering device 4 can, for example, consist of an arrangement of injection valves for direct injection of There is fuel in the combustion chambers of the internal combustion engine.
- Sensor 5 supplies the control unit with a signal about the air mass ml sucked in by the engine.
- Sensor 6 provides an engine speed signal n.
- Sensor 7 provides engine temperature T and sensor 8 delivers a signal Us about the exhaust gas composition of the engine.
- the control unit forms, in addition to further manipulated variables, the fuel metering signals ti for actuating the fuel metering means 4 such that a desired behavior of the engine, in particular a desired exhaust gas composition, is established.
- FIG. 2 shows the formation of the fuel metering signal.
- Block 2.1 represents a map which is addressed by the speed n and the relative air filling rl and in which pilot control values rk for the formation of the fuel metering signals are stored.
- the relative air filling rl is related to a maximum filling of the combustion chamber with air and thus to a certain extent indicates the fraction of the maximum combustion chamber or cylinder filling. It is essentially formed from the signal ml.
- the variable rk corresponds to the fuel quantity assigned to the air quantity rl.
- Block 2.2 shows the known multiplicative lambda control intervention. A mismatch in the amount of fuel to the amount of air is shown in the signal Us of the exhaust gas probe.
- a controller 2.3 forms the control manipulated variable fr from this signal, which reduces the mismatch via the intervention 2.2.
- the metering signal for example a trigger pulse width for the injection valves, can already be formed from the signal corrected in this way in block 2.4.
- Block 2.4 thus represents the conversion of the relative and corrected fuel quantity into a real control signal taking into account fuel pressure, injector geometry, etc.
- Blocks 2.5 to 2.9 represent the known operating parameter-dependent mixture adaptation, which can have a multiplicative and / or additive effect.
- the circle 2.9 should represent these 3 possibilities.
- the switch 2.5 is opened or closed by the means 2.6, wherein the means 2.6 are supplied with operating parameters of the internal combustion engine, such as temperature T, air mass ml and speed n. Means 2.6 in connection with the switch 2.5 thus enables an activation of the three mentioned adaptation options depending on the operating parameter range.
- the formation of the adaptation intervention fra on the fuel feed signal formation is illustrated by blocks 2.7 and 2.8. With switch 2.5 closed, block 2.7 forms the mean value frm of the control variable fr. Deviations of the mean value frm from the neutral value 1 are transferred from block 2.8 to the adaptation intervention variable fra.
- the control manipulated variable fr initially approaches 1.05 due to a mismatch in the precontrol.
- the deviation 0.05 from the value 1 is changed from block 2.8 to the value fra des Adaptation intervention taken over.
- fra then goes to 1.05, with the result that fr goes back to 1.
- the adaptation ensures that mismatches in the pilot control do not have to be corrected every time the operating point changes.
- This adaptation of the adaptation variable fra is carried out at high temperatures of the internal combustion engine, for example above a cooling water temperature of 70 ° Celsius with switch 2.5 then closed. However, once adjusted, fra also acts on the formation of the fuel metering signal when switch 2.5 is open.
- Block 3.1 supplies the deviation of the average control variable frm from the value 1 to an integrator block3.2.
- Block 3.3 activates the integrator for comparatively low engine temperatures T from an interval TMN ⁇ T ⁇ TMX.
- TMN as the lower interval limit can be, for example, 10-30, in particular 20 ° Celsuis;
- TMX as the upper interval limit can correspond, for example, to the temperature at which the conventional adaptation is activated by closing switch 2.5. A typical value for this temperature is 70 ° Celsius.
- the output value of the integrator with the value frak, provides a measure of the mismatch when the engine is comparatively cold.
- An essential feature of the invention is this value when the engine is cold when forming the fuel metering signal to be taken into account without differences at high temperatures compared to the known adaptation with a warm engine.
- Integrator output frak with a temperature-dependent variable ftk the connection having to perform the essential feature of the invention mentioned.
- the sum frat therefore has the value 1 and, when multiplied in block 2.10, does not change the formation of the fuel metering signal when the engine is warm.
- ftk has a maximum weakening effect on frak.
- the size frak is therefore not effective at all in the extreme case outlined here when the engine is warm.
- T zero "Celsius
- the minimum selection supplies the value zero and the subsequent quotient formation gives the value 1.
- the variable ftk is then neutral and has a minimal weakening effect on frak.
- ftk 1.
- the further adaptive correction according to the invention only works when the engine is cold. The correction varies continuously between the extreme values shown.
- the map 3.10 provides values K for the
- Integration speed in integrator 3.2 depends on values for drl and n. For example, K becomes smaller the larger drl.
- the size drl is the change in the intake air mass, which is particularly large, for example, in transitional operating states. In this way, mismatches have an effect
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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10043256 | 2000-09-02 | ||
DE10043256A DE10043256A1 (en) | 2000-09-02 | 2000-09-02 | Mixture adaptation method |
PCT/DE2001/003227 WO2002018766A1 (en) | 2000-09-02 | 2001-08-23 | Mixture adaptation method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1315892A1 true EP1315892A1 (en) | 2003-06-04 |
EP1315892B1 EP1315892B1 (en) | 2006-06-21 |
Family
ID=7654737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01962669A Expired - Lifetime EP1315892B1 (en) | 2000-09-02 | 2001-08-23 | Mixture adaptation method |
Country Status (6)
Country | Link |
---|---|
US (1) | US6883510B2 (en) |
EP (1) | EP1315892B1 (en) |
JP (1) | JP4773675B2 (en) |
DE (2) | DE10043256A1 (en) |
ES (1) | ES2266239T3 (en) |
WO (1) | WO2002018766A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10337228A1 (en) * | 2003-08-13 | 2005-03-17 | Volkswagen Ag | Method for operating an internal combustion engine |
JP4102401B2 (en) * | 2005-11-02 | 2008-06-18 | 三菱電機株式会社 | Internal combustion engine control device |
DE102006040743B4 (en) * | 2006-08-31 | 2019-05-16 | Robert Bosch Gmbh | Method for operating an internal combustion engine |
DE102006061682B4 (en) | 2006-12-28 | 2022-01-27 | Robert Bosch Gmbh | Procedure for pre-control of a lambda control |
DE102007016572B4 (en) | 2007-04-07 | 2018-08-02 | Volkswagen Ag | Method for operating an internal combustion engine |
DE102015220403A1 (en) | 2015-10-20 | 2017-04-20 | Robert Bosch Gmbh | Method for mixture adaptation in an internal combustion engine |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1596504A (en) * | 1976-11-04 | 1981-08-26 | Lucas Industries Ltd | Electronic fuel injection control for an internal combustion engine |
US4248196A (en) * | 1979-05-01 | 1981-02-03 | The Bendix Corporation | Open loop compensation circuit |
DE3042245A1 (en) * | 1980-11-08 | 1982-06-09 | Robert Bosch Gmbh, 7000 Stuttgart | ELECTRONIC INTERNAL COMBUSTION CONTROL SYSTEM |
US4513722A (en) * | 1981-02-20 | 1985-04-30 | Honda Giken Kogyo Kabushiki Kaisha | Method for controlling fuel supply to internal combustion engines at acceleration in cold conditions |
JPS5946329A (en) * | 1982-08-25 | 1984-03-15 | Honda Motor Co Ltd | Controlling method for supplying fuel to internal- conbustion engine after starting |
DE3341015A1 (en) | 1983-11-12 | 1985-05-30 | Robert Bosch Gmbh, 7000 Stuttgart | DEVICE FOR MIXTURE TREATMENT IN AN INTERNAL COMBUSTION ENGINE |
JPS6293445A (en) * | 1985-10-18 | 1987-04-28 | Honda Motor Co Ltd | Fuel feed control method on start of internal combustion engine |
JP2580334B2 (en) * | 1989-07-26 | 1997-02-12 | 株式会社日本自動車部品総合研究所 | Pilot injection control device |
US5074271A (en) * | 1990-10-26 | 1991-12-24 | Fuji Heavy Industries Ltd. | Fuel injection rate control system for starting two-cycle engine |
DE4325844A1 (en) | 1993-07-31 | 1995-02-02 | Bosch Gmbh Robert | Method and device for supplementary fuel metering in an internal combustion engine |
JP2000008858A (en) * | 1998-06-17 | 2000-01-11 | Toyota Autom Loom Works Ltd | Direct injection engine and its piston |
-
2000
- 2000-09-02 DE DE10043256A patent/DE10043256A1/en not_active Withdrawn
-
2001
- 2001-08-23 EP EP01962669A patent/EP1315892B1/en not_active Expired - Lifetime
- 2001-08-23 JP JP2002522659A patent/JP4773675B2/en not_active Expired - Fee Related
- 2001-08-23 WO PCT/DE2001/003227 patent/WO2002018766A1/en active IP Right Grant
- 2001-08-23 DE DE50110277T patent/DE50110277D1/en not_active Expired - Lifetime
- 2001-08-23 US US10/363,122 patent/US6883510B2/en not_active Expired - Lifetime
- 2001-08-23 ES ES01962669T patent/ES2266239T3/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0218766A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2266239T3 (en) | 2007-03-01 |
DE10043256A1 (en) | 2002-03-14 |
US6883510B2 (en) | 2005-04-26 |
DE50110277D1 (en) | 2006-08-03 |
JP4773675B2 (en) | 2011-09-14 |
EP1315892B1 (en) | 2006-06-21 |
JP2004507655A (en) | 2004-03-11 |
WO2002018766A1 (en) | 2002-03-07 |
US20040035405A1 (en) | 2004-02-26 |
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