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
  • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
  • F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
• • 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
  • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
• • 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
  • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
  • F02D2200/1015—Engines misfires
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D2250/00—Engine control related to specific problems or objectives
  • F02D2250/36—Control for minimising NOx emissions
• • 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
  • F02D41/1446—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 exhaust temperatures

Definitions

• the invention relates to an internal combustion engine according to the generic term of claim 1.
• the invention is based on the object for controlling the ⁇ -value of the internal combustion engine such that x -reduction to NO can be herwall up to the misfire limit.
• the mixture can be leaned or enriched to the extent that the misfire limit is reached but not exceeded in any operating state of the internal combustion engine.
• the NO x reduction is thus brought up to the physically possible limit.
• the exhaust gas temperature is a function of the mass average temperature, so that this can be used as a substitute size.
• the exhaust gas temperature is easy to detect with a temperature sensor and can be in the engine control unit can be used to control the ⁇ value.
• Claim 3 Another advantageous method for determining the mean mass temperature can Claim 3 can be taken.
• the exhaust gas temperature is converted from relevant engine parameters determined as a substitute quantity depending on the mean mass temperature and this is used as a control signal for the ⁇ value.
• the cylinder pressure curve can be measured with a pressure measuring probe are calculated from this and the mass average temperature and for the control of Lambda can be used.
• the method according to the invention for operating a mixture-compressing internal combustion engine in lean operation with ⁇ always greater than 1 is that one recognizes has that the critical limit for ⁇ in dynamic operation is not a fixed limit, but a sliding limit that depends on the average mass temperature in the combustion chamber.
• the method according to the invention begins, which consists in that ⁇ as a function of the average mass temperature of the compressed fuel-air mixture treated in the combustion chamber. Because this mass mean temperature cannot be determined directly is, according to the invention, the procedure is such that this variable can be measured determined, for example, that the exhaust gas temperature with a temperature sensor determined and with an engine control unit the mass average temperature as one Function of the exhaust gas temperature is calculated and the calculation result of the control of the is based on the maximum possible ⁇ value or the exhaust gas temperature as a substitute variable used for the mean mass temperature for ⁇ adjustment.
• Another possibility for smooth control of the lambda value arises by measuring the cylinder pressure curve using a pressure sensor. With help the mean temperature of the fire can be calculated and so that the lambda value can be adjusted.
• the method according to the invention can also be used in dynamic driving go to the dropout limit with ⁇ , but without exceeding it.
• ⁇ the maximum utilization of the theoretically possible spectrum for the value ⁇ is one Guaranteed minimization of pollutant levels, especially of NOx.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
• Combustion Methods Of Internal-Combustion Engines (AREA)
• Exhaust Gas After Treatment (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=7851713

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Family Cites Families (10)

• 1997
  • 1997-12-12 DE DE19755299A patent/DE19755299A1/de not_active Withdrawn
• 1998
  • 1998-11-04 EP EP98120906A patent/EP0922846B1/fr not_active Expired - Lifetime
  • 1998-11-04 DE DE59811462T patent/DE59811462D1/de not_active Expired - Lifetime
  • 1998-12-10 AU AU97053/98A patent/AU9705398A/en not_active Abandoned
  • 1998-12-11 CA CA002255462A patent/CA2255462A1/fr not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events