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
  • F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B75/00—Other engines
  • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B75/00—Other engines
  • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
  • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
  • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
• • 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
  • F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals

Definitions

• the invention relates to a method for detecting the combustion cycle in a single-cylinder four-stroke engine, in which the position and the angular velocity the crankshaft is determined.
• the invention has for its object a method of the aforementioned Way of creating it without using a the position of the camshaft determining sensor enables that of two successive To determine revolutions of the crankshaft in which the combustion cycle takes place.
• this object is achieved in that the period measured from top dead center to a certain angle of rotation of the crankshaft and that the measured period of two successive Revolutions of the crankshaft is compared, the combustion stroke in the Revolution of the crankshaft takes place with the shorter period.
• the invention is based on the knowledge that the angular velocity of the Crankshaft of a single-cylinder four-stroke engine is non-uniform.
• an accelerating force acts on the crankshaft, while in the exhaust, Intake and compression stroke via the piston and the connecting rod to the crankshaft acts a braking force.
• the crankshaft is the period, i.e. H. those for the twist the crankshaft by a certain angle of rotation in two successive Revolutions of the same required time period of different lengths.
• the period is preferably from top dead center to bottom Dead center of the crankshaft measured, because in this area the greatest differences the angular velocity of the crankshaft occur.
• the difference in measured period of two successive revolutions of the crankshaft is therefore particularly large and clear.
• the method according to the invention provides the advantage that the service life the spark plug is doubled because only half the number of ignition sparks is left is produced. Due to the reduced energy requirement of the ignition coil, the generator can turn out smaller and cheaper. Furthermore, the raw emissions are lower, since the fuel is injected in the correct phase, so that a cheaper (coating) Catalyst can be used. This will be done without using a Position of the camshaft determining sensor reached by that revolution the crankshaft is determined in which the combustion cycle takes place.
• the position of the crankshaft is first determined, and fuel is injected every revolution. As soon as the engine independently runs and because of the accelerating from the piston via the connecting rod or braking forces has a non-uniform angular velocity be clearly determined in which of two successive revolutions the crankshaft the combustion cycle takes place. Starting from this revolution can then be injected and a fuel every second revolution Spark are generated.
• the crankshaft is accelerated by the combustion. This acceleration takes place during the following intake stroke (360 ° later) not instead.
• the period is used to calculate this acceleration measured from top dead center (TDC) to bottom dead center (TDC) of the crankshaft.
• TDC top dead center
• TDC bottom dead center
• the measurement of the period is filtered in a suitable manner, where a different filter time constant is used during the start process is considered in normal engine operation. This will influence the starter's influence on the Measurement of the period duration minimized.
• To determine the combustion cycle the difference in the period of two successive revolutions as a percentage calculated. The sign of this percentage is a measure of each slower or faster rotation.
• the combustion stroke is recognized and the injection pulses and the ignitions can be correctly output at the combustion stroke.
• the detection of the threshold value is temperature-dependent in the start area of the engine executed to the different friction losses in warm and cold engine to compensate. The detection takes place during normal operation of the engine of the threshold value in a load and speed range (map) in order at every operating point of the engine to ensure reliable detection of the combustion cycle.
• a diagnostic function monitors the correct detection.
• the skilled person is familiar with the formation of a device for determining the position, d. H. the angle of rotation of the crankshaft and to determine the duration of a certain period of the crankshaft known, so that a more detailed explanation is unnecessary.
• the determined measurement results are in an engine control processed to ensure that fuel in the right amount and for is injected into the cylinder at the right time and the Ignition takes place.

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)

Applications Claiming Priority (2)

Publications (2)

Family

ID=7636822

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (10)

Family Cites Families (10)

• 2000
  • 2000-03-29 DE DE10015595A patent/DE10015595A1/de not_active Withdrawn
• 2001
  • 2001-02-07 EP EP01102656A patent/EP1138899A3/fr not_active Withdrawn
  • 2001-03-19 JP JP2001078958A patent/JP2001289109A/ja active Pending
  • 2001-03-29 US US09/820,317 patent/US6550452B2/en not_active Expired - Fee Related

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