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1. WO1996005419 - METHOD AND SYSTEM FOR AN ADAPTIVE FUEL CONTROL IN TWO-STROKE ENGINES

Publication Number WO/1996/005419
Publication Date 22.02.1996
International Application No. PCT/SE1995/000915
International Filing Date 08.08.1995
IPC
F02B 75/02 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
75Other engines, e.g. single-cylinder engines
02Engines characterised by their cycles, e.g. six-stroke
F02D 35/02 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
DCONTROLLING COMBUSTION ENGINES
35Non-electrical control of engines, dependent on conditions exterior or interior to engines, not otherwise provided for
02on interior conditions
F02D 41/14 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
DCONTROLLING COMBUSTION ENGINES
41Electrical control of supply of combustible mixture or its constituents
02Circuit arrangements for generating control signals
14Introducing closed-loop corrections
F02D 41/24 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
DCONTROLLING COMBUSTION ENGINES
41Electrical control of supply of combustible mixture or its constituents
24characterised by the use of digital means
CPC
F02B 2075/025
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
75Other engines
02Engines characterised by their cycles, e.g. six-stroke
022having less than six strokes per cycle
025two
F02D 2200/1015
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
DCONTROLLING COMBUSTION ENGINES
2200Input parameters for engine control
02the parameters being related to the engine
10Parameters related to the engine output, e.g. engine torque or engine speed
1015Engines misfires
F02D 2400/04
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
DCONTROLLING COMBUSTION ENGINES
2400Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
04Two-stroke combustion engines with electronic control
F02D 35/021
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
DCONTROLLING COMBUSTION ENGINES
35Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
02on interior conditions
021using an ionic current sensor
F02D 35/027
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
DCONTROLLING COMBUSTION ENGINES
35Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
02on interior conditions
027using knock sensors
F02D 41/1497
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
DCONTROLLING COMBUSTION ENGINES
41Electrical control of supply of combustible mixture or its constituents
02Circuit arrangements for generating control signals
14Introducing closed-loop corrections
1497With detection of the mechanical response of the engine
Applicants
  • MECEL AB [SE]/[SE] (AllExceptUS)
  • JOHANSSON, Hans [SE]/[SE] (UsOnly)
  • NYTOMT, Jan [SE]/[SE] (UsOnly)
Inventors
  • JOHANSSON, Hans
  • NYTOMT, Jan
Agents
  • FURHEM, Hans
Priority Data
9402688-711.08.1994SE
Publication Language English (EN)
Filing Language Swedish (SV)
Designated States
Title
(EN) METHOD AND SYSTEM FOR AN ADAPTIVE FUEL CONTROL IN TWO-STROKE ENGINES
(FR) PROCEDE ET SYSTEME DE COMMANDE DE CARBURANT ADAPTATIVE DANS DES MOTEURS A DEUX TEMPS
Abstract
(EN)
The invention relates to a method and system for adaptive correction of the amount of fuel supplied in two-stroke combustion engines. During a continuous operation period is the air-fuel mixture regulated by force in increments in the lean direction ($g(D)F-) respectively in the rich direction ($g(D)F+), whereby the fuel amounts (F) could be established which causes knocking (KNOCK) respectively four-stroking or misfiring (4-ST). These limit values are stored as a lean limit value MFK respectively a rich limit value MF4ST. For further operation of the combustion engine is a corrected fuel amount Fkorr, used, which is corrected in relation to the fuel amount Ftab given from an empirically determined value stored in a map, and dependent of the established lean limit value MFK respectively the rich limit value MF4ST. The fuel amount (F) supplied will suitably be given according the function: F = Fkorr = MFK + K . (MF4ST - MFK), where K is a margin factor which defines if further operation of the engine will be controlled having an equidistant margin towards a knocking condition respectively a four-stroking or misfire condition, if K is set to a value of 0.5, or if further operation will be controlled toward leaner air-fuel ratios, if K is set to a value below 0.5. Further control could thus be made having a fixed relative margin towards a knocking condition as well as a four-stroking condition.
(FR)
Procédé et système de correction adaptative de la quantité de carburant fournie à des moteurs à combustion à deux temps. Pendant une période de fonctionnement continue, le mélange air-carburant est régulé de force par incréments dans le sens du mélange pauvre ($g(D)F-), respectivement dans le sens du mélange riche ($g(D)F+), ce qui permet de déterminer les quantités de carburant (F) qui provoquent le cliquetis (KNOCK), respectivement le fonctionnement à quatre temps ou les défauts d'allumage (4-ST). Ces valeurs limite sont stockées sous forme de valeur limite de mélange pauvre MFK, respectivement de valeur limite de mélange riche MF4ST. Afin de permettre le fonctionnement du moteur à combustion, on utilise en outre une quantité corrigée de carburant Fkorr, qui est corrigée par rapport à la quantité de carburant Ftab obtenue à partir d'une valeur déterminée empiriquement et stockée dans une table, et dépendant de la valeur limite de mélange pauvre établie MFK, respectivement de la valeur limite de mélange riche MF4ST. La quantité de carburant (F) fournie sera déterminée selon la fonction F = Fkorr = MFK + K. (MF4ST - MFK), où K est un facteur de marge définissant si le fonctionnement ultérieur du moteur sera régulé de manière à présenter une marge équidistante par rapport au phénomène de cliquetis, ou au fonctionnement à quatre temps ou aux défauts d'allumage, lorsque K a une valeur de 0,5, ou si le fonctionnement ultérieur sera régulé de manière à obtenir des rapports air-carburants plus pauvres, lorsque K a une valeur inférieure à 0,5. Il est ainsi possible d'appliquer une régulation ultérieure présentant une marge relative fixe par rapport au phénomène de cliquetis ainsi qu'au fonctionnement à quatre temps.
Also published as
DE19581053
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