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
  • F02D41/1497—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

Definitions

• the invention relates to a control device for the idle speed of an internal combustion engine driving a vehicle, wherein a speed value that is favorable with regard to smooth running is set.
• a control device for the idle speed of an internal combustion engine driving a vehicle wherein a speed value that is favorable with regard to smooth running is set.
• Such an idle speed control device is described in DE 32 31 766 A1.
• the smooth running of the internal combustion engine is determined and the idle speed is then set by an electronic control unit to a value lying between two limit values such that the smooth running of the internal combustion engine is optimal and the smooth running of the internal combustion engine is minimal.
• the type of uneven running detection can be multi-layered, for example, it is possible to determine the round trip times of the engine crankshaft or differential quotients thereof, an ion current measurement in the combustion chamber is also proposed, but pressure fluctuations or Fluctuations in light intensity in the combustion chamber can be evaluated, furthermore these can and other specific sizes can be determined in the exhaust pipe of the internal combustion engine.
• the invention Since it is ultimately not a goal to create an internal combustion engine that runs as smoothly as possible, but rather an optimally smooth running sensation in the vehicle that is driven by the internal combustion engine, the invention has set itself the task of identifying a control device that meets these requirements .
• the smoothness is determined on the basis of signals from at least one acceleration sensor arranged on the vehicle.
• the smoothness can be determined on the basis of signals from at least one noise sensor provided in the vehicle interior.
• the aim is to achieve such an idling quality of the internal combustion engine in vehicles driven by internal combustion engines that the internal combustion engine does not operate from the vehicle occupants more can be perceived based on vibrations and / or noises.
• the vibrations generated by the internal combustion engine, the exhaust system and other units of the vehicle drive train must therefore not lie in the resonance frequency of the vehicle body. It has been shown that this condition can be met on each individual copy of a vehicle by specifically adjusting or trimming the idling speed, but of course this is not optimally possible for a large series because of the existing series distributions. In practice, vehicles with idling problems can often be significantly improved if the idling speed is changed by a few percent.
• a control device which automatically adjusts the idle speed of the internal combustion engine upwards or downwards within a predetermined range and determines the best idling quality by means of suitable sensors. This then most favorable speed value with regard to smooth running is then maintained by the control electronics for the internal combustion engine.
• the smoothness according to the invention is determined on the basis of signals from at least one acceleration sensor arranged in the vehicle.
• the vehicle can thus have one or more acceleration sensors, for example on the steering wheel or on the seat rail or at other suitable locations on the body. If the measured values determined by the acceleration sensor (s) in the internal combustion engine idle now exceed a preprogrammed threshold value, the control electronics of the internal combustion engine start up a different idle speed, whereupon the sensor signals which thus result be determined.
• the entire available idling range which can be limited by lower and upper limit values for the idling speed, can be traversed, an electronic control unit for the idling speed searching for the speed value with the best idling quality, that is to say with the lowest acceleration levels of the acceleration sensors.
• the effect of a change in the idling speed that is actually noticeable for the vehicle occupants is thus measured, the speed value which is optimal for the vehicle occupants' feeling of smooth running being set, that is to say which causes the lowest acceleration level at the acceleration sensors, to be set subsequently.
• the noise level in the vehicle interior can be measured, for example, at the vehicle seat and / or at the other seats at idle speed.
• the regulation can then take place as already explained, i. H.
• An electronic control unit for determining the most favorable idling speed value causes the electronic control unit of the internal combustion engine to approach various speed values in the available idling speed range and evaluates the noise levels that result or set therewith. Ultimately, the speed value is set at which the lowest noise level results. It can also be used as noise sensors already existing microphones in the vehicle interior, z. B. from the hands-free device of a car phone, used or shared.
• Such additional boundary conditions may be, for example, the consumption-optimized operation, i. H. in particular the lowest possible idling speed.
• consideration can also be given to exhaust gas emissions or, for example, the state of charge of a battery.
• additional power requirements of additional units such as air conditioning and / or various electrical consumers, a higher, comfort-optimized idling speed can also be found temporarily using the same method, by simply not reducing the speed value downwards, ie. H. allowed to lower values and the control range up if necessary, d. H. is expanded to higher speed values.
• the electronic control unit can preferably operate in a self-learning manner in order to determine the idle speed value that is most favorable with regard to smooth running. This means that once an optimal speed value has been found, it is first approached before the idle speed is changed, if the sensor signals, in particular acceleration sensor signals, exceed a threshold value, in order to achieve a speed value that is more favorable with regard to smooth running.
• the electronic control unit for determining the idle speed value can also be linked to an active sound absorption system, as is known, for example, from DE 42 26 885 A1.
• its computing capacity can be used.
• This electronics determines the disturbing frequencies in idle mode, calculates another idle speed value that is no longer disturbing and controls this in the control electronics of the internal combustion engine.
• this and a large number of further details can be designed quite differently without leaving the content of the claims.
• the future increasing demands on the idling quality of vehicles driven by internal combustion engines, in particular those that are offered in widely varying engine types, can always be met in a simple manner without expensive additional measures.

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)
• Combined Controls Of Internal Combustion Engines (AREA)
• Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7793651

Family Applications (1)

Country Status (3)

Cited By (2)

Families Citing this family (1)

Citations (6)

Family Cites Families (4)

• 1996
  • 1996-05-08 DE DE19618403A patent/DE19618403A1/de not_active Withdrawn
• 1997
  • 1997-03-26 ES ES97105087T patent/ES2152588T3/es not_active Expired - Lifetime
  • 1997-03-26 EP EP97105087A patent/EP0806560B1/fr not_active Expired - Lifetime
  • 1997-03-26 DE DE59702551T patent/DE59702551D1/de not_active Expired - Lifetime

Patent Citations (6)

Non-Patent Citations (3)

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