EP0489864A1 - Verfahren zum betrieb einer brennkraftmaschine. - Google Patents
Verfahren zum betrieb einer brennkraftmaschine.Info
- Publication number
- EP0489864A1 EP0489864A1 EP90914396A EP90914396A EP0489864A1 EP 0489864 A1 EP0489864 A1 EP 0489864A1 EP 90914396 A EP90914396 A EP 90914396A EP 90914396 A EP90914396 A EP 90914396A EP 0489864 A1 EP0489864 A1 EP 0489864A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- mixture
- combustion engine
- internal combustion
- controller
- 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
- 238000002485 combustion reaction Methods 0.000 title claims description 14
- 238000000034 method Methods 0.000 title claims description 13
- 239000000203 mixture Substances 0.000 claims abstract description 39
- 230000001133 acceleration Effects 0.000 claims abstract description 3
- 239000000523 sample Substances 0.000 claims description 16
- 239000000498 cooling water Substances 0.000 claims description 14
- 239000000446 fuel Substances 0.000 claims description 8
- 239000004519 grease Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
-
- 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
- F02D41/068—Introducing corrections for particular operating conditions for engine starting or warming up for 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
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
- F02D41/1488—Inhibiting the regulation
-
- 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
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
- F02D41/1456—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with sensor output signal being linear or quasi-linear with the concentration of oxygen
Definitions
- the invention relates to a method for operating an internal combustion engine according to the preamble of claim 1.
- a conventional ⁇ control regulates the mixture of fuel and air to be supplied to an internal combustion engine to a stoichiometric ratio.
- the ⁇ control must therefore be switched off and its task is performed by a controller. This procedure works satisfactorily as long as the control system correctly sets the required rich mixture during special operation. Due to incorrect adjustment or corresponding long-term changes, it can happen that a lean mixture is set instead of the required rich one. Especially towards the end of a special operation when the fat one
- the object of the invention is to control the mixture during such special operating conditions
- the solution according to the invention is characterized in claim 1.
- Advantageous developments of the invention can be found in the subclaims.
- the control range of the ⁇ regulator is therefore limited so that it regulates only in the rich direction and not in the lean direction.
- the ⁇ control does not apply to a rich mixture. However, if the control incorrectly sets a lean mixture, the ⁇ control can intervene in the enriching direction and thus mitigate the error to a tolerable level.
- the ⁇ controller with the limited control range is therefore switched on after the internal combustion engine has started, as soon as a probe operating temperature of the ⁇ probe is reached, that is to say immediately when the ⁇ control itself is ready for operation. Only when a minimum cooling water temperature is reached, which indicates the end of warm-up, at which the machine no longer needs a rich mixture, will the control range be released without restriction in the direction of rich and lean.
- Other special operating conditions that require a rich mixture are the accelerating mode and the full-load mode.
- the probe operating temperature of the ⁇ probe has already been reached and therefore the ⁇ control with a limited control range can be switched on during the entire acceleration or full-load operation.
- Figure 1 is a diagram for explaining the invention
- Figure 2 is a simplified block diagram of a device for
- the air ratio ⁇ is plotted against the cooling water temperature TKW.
- TKW cooling water temperature
- the machine is in the warm-up phase until a minimum cooling water temperature TKWM is reached.
- a rich mixture is set at the start depending on the level of the cooling water temperature TKW.
- this initially set mixture is then controlled to the stoichiometric mixture ratio until the minimum cooling water temperature TKWM is reached.
- Such an ideal mixture course is shown in FIG. 1 on the basis of the solid line.
- the ⁇ control then regulates a stoichiometric mixture ratio, which in turn is idealized in FIG. 1.
- Two dashed lines run parallel to the ideal mixture profile during the warm-up phase, which illustrate the fluctuation range of the mixture values set by a real controller.
- a mixture course according to the lower line means an enrichment going beyond the required level and the upper line an insufficient enrichment.
- the course of the mixture according to the upper line there are even mixture values towards the end of the warm-up phase which are above the stoichiometric ratio in the lean direction.
- this is undesirable, especially during the warm-up phase, since the smooth running of the machine can no longer be guaranteed.
- Such a lean mixture is reliably prevented by the method according to the invention during the warm-up phase. Because, in addition to the control, the ⁇ control is only switched on for the control in the bold direction, all mixture values set by the control which are above the stoichiometric ratio are reduced to the stoichiometric ratio.
- FIG. 2. 1 denotes a ⁇ controller, 3 a logic device and 4 a controller.
- the functions of these three devices are carried out by a microcomputer MC with appropriate programming.
- the microcomputer MC receives the signals for an air ratio ⁇ from a ⁇ probe 2, a cooling water temperature TKW from a temperature sensor 5, a speed n from a speed sensor 6 and an air mass LM from an air mass meter 7.
- An output of the microcomputer MC is connected to injectors 8 with appropriate control. The amount of fuel injected, and thus the mixture ratio, is determined via the opening time of the individual injection valves controlled by this.
- the control 4 receives the cooling water temperature TKW, the speed n and the air mass LM as input variables.
- the controller 4 determines the fuel quantity to be injected from a characteristic map via the speed n and the air mass LM, that is to say the load on the machine.
- Another map contains an additional amount of fuel required for the cold start depending on the cooling water temperature TKW. This enrichment which is brought about in the event of a cold start is then carried out in accordance with that in FIG shown function until the end of the warm-up phase.
- the output signals of the controller 4 and the ⁇ controller 1 are fed to a logic device 3. This selects the one of the two output signals that is passed on to the injection valves 8.
- the air ratio ⁇ and the cooling water temperature TKW are supplied to the logic device 3.
- the selection is explained on the basis of the flow diagram of FIG. 3.
- the logic device 3 accordingly calls a program block "control and ⁇ -Re This program block contains the functions of the controller 4 and the ⁇ controller 1, the function of the ⁇ controller 1 only being carried out in the greasing direction.
- the ⁇ controller is therefore only active when the controller is in control In this case, the function corresponding to the ⁇ controller 1 becomes active so that the set mixture values do not exceed the stoichiometric ratio.
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)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP89118488 | 1989-10-05 | ||
| EP89118488 | 1989-10-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0489864A1 true EP0489864A1 (de) | 1992-06-17 |
| EP0489864B1 EP0489864B1 (de) | 1993-11-18 |
Family
ID=8201981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90914396A Expired - Lifetime EP0489864B1 (de) | 1989-10-05 | 1990-09-26 | Verfahren zum betrieb einer brennkraftmaschine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5279275A (de) |
| EP (1) | EP0489864B1 (de) |
| DE (1) | DE59003560D1 (de) |
| ES (1) | ES2046796T3 (de) |
| WO (1) | WO1991005153A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2778383B2 (ja) * | 1992-10-02 | 1998-07-23 | 日産自動車株式会社 | エンジンの空燃比制御装置 |
| EP0593800B1 (de) * | 1992-10-19 | 1995-12-27 | Siemens Aktiengesellschaft | Verfahren zum Betrieb einer Brennkraftmaschine im Vollastbetrieb |
| DE19501458B4 (de) * | 1995-01-19 | 2009-08-27 | Robert Bosch Gmbh | Verfahren zur Adaption der Warmlaufanreicherung |
| DE19955649C2 (de) * | 1999-11-19 | 2002-01-10 | Bosch Gmbh Robert | Elektronische Motorsteuerung einer Brennkraftmaschine |
| DE10307004B3 (de) * | 2003-02-19 | 2004-08-05 | Siemens Ag | Verfahren zur Steuerung einer Brennkraftmaschine mit einer Lambda-Regelung |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1518763A (en) * | 1975-03-07 | 1978-07-26 | Nissan Motor | Closed loop air fuel ratio control system using exhaust composition sensor |
| JPS51144828A (en) * | 1975-06-09 | 1976-12-13 | Nissan Motor Co Ltd | Synthetic exhaust countermeasure system for internal combustion engine |
| JPS5926781B2 (ja) * | 1975-11-25 | 1984-06-30 | 株式会社デンソー | クウネンヒキカンシキコンゴウキセイギヨソウチ |
| JPS5916090B2 (ja) * | 1976-06-18 | 1984-04-13 | 株式会社デンソー | 空燃比帰還式混合気制御装置 |
| JPS58104336A (ja) * | 1981-12-16 | 1983-06-21 | Toyota Motor Corp | 電子制御燃料噴射式内燃機関の暖機加速増量方法 |
| JPS6069242A (ja) * | 1983-09-26 | 1985-04-19 | Nippon Carbureter Co Ltd | 内燃機関の空燃比制御方法 |
| JPS60206953A (ja) * | 1984-03-30 | 1985-10-18 | Toyota Motor Corp | 内燃機関の空燃比制御装置 |
| JPS63167061A (ja) * | 1986-12-27 | 1988-07-11 | Honda Motor Co Ltd | 内燃エンジンの空燃比制御装置 |
-
1990
- 1990-09-26 US US07/820,647 patent/US5279275A/en not_active Expired - Lifetime
- 1990-09-26 DE DE90914396T patent/DE59003560D1/de not_active Expired - Fee Related
- 1990-09-26 WO PCT/EP1990/001628 patent/WO1991005153A1/de not_active Ceased
- 1990-09-26 EP EP90914396A patent/EP0489864B1/de not_active Expired - Lifetime
- 1990-09-26 ES ES199090914396T patent/ES2046796T3/es not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9105153A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US5279275A (en) | 1994-01-18 |
| EP0489864B1 (de) | 1993-11-18 |
| WO1991005153A1 (de) | 1991-04-18 |
| DE59003560D1 (de) | 1993-12-23 |
| ES2046796T3 (es) | 1994-02-01 |
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