GB2102165A - Method of controlling an internal combustion engine - Google Patents
Method of controlling an internal combustion engine Download PDFInfo
- Publication number
- GB2102165A GB2102165A GB08219073A GB8219073A GB2102165A GB 2102165 A GB2102165 A GB 2102165A GB 08219073 A GB08219073 A GB 08219073A GB 8219073 A GB8219073 A GB 8219073A GB 2102165 A GB2102165 A GB 2102165A
- Authority
- GB
- United Kingdom
- Prior art keywords
- combustion
- actual
- internal combustion
- combustion chamber
- control unit
- 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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/1455—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means by using a second control of the closed loop type
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Ignition Timing (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The optimum values of combustion chamber pressure of engine 1 are experimentally determined as a function of the crankshaft angle and are stored as set values in the memory of an electronic control unit (3). The actual pressure in the combustion chamber is continually measured by sensor 2 and fed to the control unit (3) where it is compared with the set value. Deviations between the actual and set values are rectified by modifying the air/fuel mixture (4) or ignition timing (5) of the internal combustion engine. Other characteristics of the combustion process may be used instead of pressure. <IMAGE>
Description
SPECIFICATION
Method of controlling the combustion sequence in internal combustion engines
The invention concerns a method of controlling the combustion sequence in internal combustion engines, especially Otto cycle engines.
In the combustion process in internalcombustion engines which is reflected, for example, in the variation of the combustion chamber pressure as a function of the crankshaft angle (Figure 1), three phases can be distinguished. In the initial phase of combustion approximately between 400 to 200 before top dead centre (TDC) a turbulent flame core forms in the proximity of the spark plug. In order for this phase, referred to as ignition delay, to be able to move into the second phase, called the main phase, the flame core must reach the dimensions of the turbulent flame region. In the main phase occurs the expansion of the turbulent flame through the combustion chamber, which results in combustion of the main portion of the combustible mixture.The final phase of the combustion, from approximately 100 after top dead centre (TDC), consists of post-combustion of the mixture behind the flame front. The duration and development of the individual phases depend on the ignition conditions, mixture composition, turbulence intensity, pressure, temperature and chemical characteristics of the fuel.
These three phases of mixture combustion reoccur in each operating cycle. The successive combustion sequences, which at any given time can be recorded by a pressure-crankshaft angleindicator diagram, exhibit considerable variations under constant operating conditions. The nonuniformity of the operating cycles reduces the indicated effective mean pressure and thus the efficiency of the internal-combustion engine, particularly when it is operated in an excess air range (amount of air actually required exceeds theoretical amount to burn fuel). In addition, because of these cyclic variations, the emission of the legally restricted quantities of the exhaust components NO, HC and CO increases.
Based on these physical facts, the purpose of the invention is to increase the efficiency of the internal combustion engines and to reduce the harmful exhaust emissions by eliminating cyclic variations in the combustion sequence.
The present invention consists in a method of controlling the combustion sequence in an internal combustion engine, wherein the optimum values of the combustion characteristic (of the combustion chamber pressure) are determined as functions of the crankshaft angle and are stored in an electronic control unit, the actual combustion characteristic in the combustion chamber being continually measured and compared with the set values stored in the control unit and the deviations between the actual and set values are rectified by intervening into the formation of the mixture and/or the ignition system of the internal combustion engine.
By regulation according to this invention, on the one hand, successive combustion sequences will be made comparable and, on the other, adjustment to the experimentally determined and stored optimum values will be accomplished. The controlled variable is preferably the combustion chamber pressure, the variation of which, when at variance with the electronically stored set value, is adjusted as a function of the crankshaft angle by altering the mixture composition or ignition timing point. For each operating phase of the performance characteristics, from the idling speed to the maximum output, the optimum set value curves are recorded and stored in the electronic control unit.
In the accompanying drawings:- Fig. 1 is a graph showing cylinder pressure/crank angle relationship of an internal combustion engine, and
Fig. 2 is a block diagram showing the control circuit for carrying out the present invehtion.
Referring to Fig. 2, in the internal combustion engine 1 the actual combustion chamber pressure is continually determined by an indicator device 2 and, as an actual value signal, it is sent to an electronic control unit 3 which contains optimum curve traces of the combustion chamber pressure as the set value. When a deviation between the actual and the set value occurs, an adjustment signal is sent to a mixing device 4 and/or to the ignition system 5 of the engine 1, which are appropriately adjusted and thus the combustion chamber pressure is adjusted to the proper set value.
In this way in Otto cycle engines an increase in specific work or output of approximately 6% can be reached which means at the same time an improvement in actual efficiency. In the excess air range, the NO emission can be reduced by 30% to 50%. These advantages far outweigh the additional costs of the control unit and guarantee an extraordinarily economical operation of an Otto cycle engine which is equipped with this unit.
1. A method of controlling the combustion sequence in an internal combustion engine, wherein the optimum values of the combustion characteristic (of the combustion chamber pressure) are determined as functions of the crankshaft angle and are stored in an electronic control unit, the actual combustion characteristic in the combustion chamber being continually measured and compared with the set values stored in the control unit and the deviations between the actual and set values are rectified by intervening into the formation of the mixture
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
1. A method of controlling the combustion sequence in an internal combustion engine, wherein the optimum values of the combustion characteristic (of the combustion chamber pressure) are determined as functions of the crankshaft angle and are stored in an electronic control unit, the actual combustion characteristic in the combustion chamber being continually measured and compared with the set values stored in the control unit and the deviations between the actual and set values are rectified by intervening into the formation of the mixture and/orthe ignition system of the internal combustion engine.
2. A method of controlling the combustion sequence in an internal combustion engine substantially as descrbed with reference to Fig. 2 of the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19813128245 DE3128245A1 (en) | 1981-07-17 | 1981-07-17 | "METHOD FOR CONTROLLING THE COMBUSTION PROCESS IN INTERNAL COMBUSTION ENGINES" |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2102165A true GB2102165A (en) | 1983-01-26 |
GB2102165B GB2102165B (en) | 1985-07-24 |
Family
ID=6137108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08219073A Expired GB2102165B (en) | 1981-07-17 | 1982-07-01 | Method of controlling an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5825547A (en) |
DE (1) | DE3128245A1 (en) |
FR (1) | FR2509797B1 (en) |
GB (1) | GB2102165B (en) |
IT (1) | IT1190855B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0142101A2 (en) * | 1983-11-04 | 1985-05-22 | Nissan Motor Co., Ltd. | Automotive engine control system capable of detecting specific engine operating conditions and projecting subsequent engine operating patterns |
GB2149535A (en) * | 1983-11-02 | 1985-06-12 | Epicam Limited | Internal combustion engine fuel supply and tuning |
EP0170018A2 (en) * | 1984-08-03 | 1986-02-05 | Robert Bosch Gmbh | Process and apparatus for the self-testing of control levers |
EP0115807A3 (en) * | 1983-01-26 | 1986-03-12 | Nissan Motor Co., Ltd. | Method for discriminating motor/combustion pressures in an i.c.e. combustion chamber |
EP0203617A2 (en) * | 1985-05-30 | 1986-12-03 | Honda Giken Kogyo Kabushiki Kaisha | Ignition timing control system for internal combustion engine |
US4760825A (en) * | 1984-08-03 | 1988-08-02 | Nissan Motor Company, Limited | System for controlling an engine and method therefor |
GB2205663A (en) * | 1986-12-01 | 1988-12-14 | Ford Motor Co | Adaptive lean limit air fuel control using combustion pressure sensor feedback |
EP0851107A2 (en) * | 1996-12-27 | 1998-07-01 | Cummins Engine Company, Inc. | Cylinder pressure based air-fuel ratio and engine control |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3641854A1 (en) * | 1986-12-08 | 1988-06-09 | Bundesrep Deutschland | Method for compensating for the influence of different grades of fuel on the operating performance of a diesel engine |
DE19520605C1 (en) * | 1995-06-06 | 1996-05-23 | Daimler Benz Ag | Set-point control of combustion sequence in Otto-cycle IC engine |
DE102006023473B3 (en) * | 2006-05-18 | 2007-05-03 | Siemens Ag | Internal combustion engine operating method for motor vehicle, involves adapting control variable for controlling unit to given sequence of combustion for adjusting sequence of combustion in reference cylinder |
DE102007013119A1 (en) * | 2007-03-13 | 2008-09-18 | Fev Motorentechnik Gmbh | Injection method and associated internal combustion engine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3957023A (en) * | 1974-03-29 | 1976-05-18 | Peterson M Maurice | Pressure responsive engine ignition control system |
JPS6011216B2 (en) * | 1977-05-26 | 1985-03-23 | 株式会社デンソー | Air fuel ratio control device |
DE2939590A1 (en) * | 1979-09-29 | 1981-04-09 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD FOR REGULATING THE COMPOSITION OF THE OPERATING MIXTURE SUPPLIED TO AN INTERNAL COMBUSTION ENGINE |
-
1981
- 1981-07-17 DE DE19813128245 patent/DE3128245A1/en not_active Withdrawn
-
1982
- 1982-06-07 IT IT21733/82A patent/IT1190855B/en active
- 1982-07-01 GB GB08219073A patent/GB2102165B/en not_active Expired
- 1982-07-07 FR FR8211914A patent/FR2509797B1/en not_active Expired
- 1982-07-16 JP JP57123096A patent/JPS5825547A/en active Pending
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0115807A3 (en) * | 1983-01-26 | 1986-03-12 | Nissan Motor Co., Ltd. | Method for discriminating motor/combustion pressures in an i.c.e. combustion chamber |
GB2149535A (en) * | 1983-11-02 | 1985-06-12 | Epicam Limited | Internal combustion engine fuel supply and tuning |
EP0142101A3 (en) * | 1983-11-04 | 1987-08-05 | Nissan Motor Co., Ltd. | Automotive engine control system capable of detecting specific engine operating conditions and projecting subsequent engine operating patterns |
EP0142101A2 (en) * | 1983-11-04 | 1985-05-22 | Nissan Motor Co., Ltd. | Automotive engine control system capable of detecting specific engine operating conditions and projecting subsequent engine operating patterns |
EP0170018A3 (en) * | 1984-08-03 | 1988-03-23 | Robert Bosch Gmbh | Process and apparatus for the self-testing of control levers |
EP0170018A2 (en) * | 1984-08-03 | 1986-02-05 | Robert Bosch Gmbh | Process and apparatus for the self-testing of control levers |
US4760825A (en) * | 1984-08-03 | 1988-08-02 | Nissan Motor Company, Limited | System for controlling an engine and method therefor |
EP0203617A3 (en) * | 1985-05-30 | 1987-09-02 | Honda Giken Kogyo Kabushiki Kaisha | Ignition timing control system for internal combustion engine |
EP0203617A2 (en) * | 1985-05-30 | 1986-12-03 | Honda Giken Kogyo Kabushiki Kaisha | Ignition timing control system for internal combustion engine |
GB2205663A (en) * | 1986-12-01 | 1988-12-14 | Ford Motor Co | Adaptive lean limit air fuel control using combustion pressure sensor feedback |
GB2205663B (en) * | 1986-12-01 | 1990-11-28 | Ford Motor Co | Adaptive lean limit air fuel control using combustion pressure sensor feedback |
EP0851107A2 (en) * | 1996-12-27 | 1998-07-01 | Cummins Engine Company, Inc. | Cylinder pressure based air-fuel ratio and engine control |
EP0851107A3 (en) * | 1996-12-27 | 2000-01-12 | Cummins Engine Company, Inc. | Cylinder pressure based air-fuel ratio and engine control |
Also Published As
Publication number | Publication date |
---|---|
DE3128245A1 (en) | 1983-01-27 |
JPS5825547A (en) | 1983-02-15 |
IT8221733A0 (en) | 1982-06-07 |
IT1190855B (en) | 1988-02-24 |
FR2509797B1 (en) | 1987-05-29 |
FR2509797A1 (en) | 1983-01-21 |
GB2102165B (en) | 1985-07-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |