EP2679801A2 - Circuit de sécurité de démarrage dans un appareil de travail doté d'un moteur à combustion interne - Google Patents

Circuit de sécurité de démarrage dans un appareil de travail doté d'un moteur à combustion interne Download PDF

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Publication number
EP2679801A2
EP2679801A2 EP13002890.5A EP13002890A EP2679801A2 EP 2679801 A2 EP2679801 A2 EP 2679801A2 EP 13002890 A EP13002890 A EP 13002890A EP 2679801 A2 EP2679801 A2 EP 2679801A2
Authority
EP
European Patent Office
Prior art keywords
circuit according
sensor
circuit
safety circuit
starting
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
Application number
EP13002890.5A
Other languages
German (de)
English (en)
Other versions
EP2679801A3 (fr
EP2679801B1 (fr
Inventor
Carel Dr. Karrar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Publication of EP2679801A2 publication Critical patent/EP2679801A2/fr
Publication of EP2679801A3 publication Critical patent/EP2679801A3/fr
Application granted granted Critical
Publication of EP2679801B1 publication Critical patent/EP2679801B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0803—Circuits or control means specially adapted for starting of engines characterised by means for initiating engine start or stop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/10—Safety devices
    • F02N11/101—Safety devices for preventing engine starter actuation or engagement
    • 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
    • F02P11/00—Safety means for electric spark ignition, not otherwise provided for
    • F02P11/02—Preventing damage to engines or engine-driven gearing
    • F02P11/025—Shortening the ignition when the engine is stopped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control 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
    • F02D2400/06—Small engines with electronic control, e.g. for hand held tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2300/00—Control related aspects of engine starting
    • F02N2300/20—Control related aspects of engine starting characterised by the control method
    • F02N2300/2011—Control involving a delay; Control involving a waiting period before engine stop or engine start

Definitions

  • the invention relates to a starting safety circuit in a working device with an internal combustion engine according to the preamble of claim 1.
  • Such a start safety circuit in a hand-held implement is from the DE 10 2008 007 786 A1 known.
  • a control device checks the status signals of several sensors to switch off depending on their switching states main or auxiliary units of the implement.
  • the controller detects the stationary drive motor to intervene accordingly.
  • the z. B. can be provided via a battery.
  • the invention has for its object to form a start safety circuit in a working device with an internal combustion engine such that a start and run up of the engine is possible only at predetermined starting conditions.
  • the status signal of the operating sensor arranged on the safety brake device and the status signal of the position sensor arranged on the operating mode controller are logically linked together. Whenever the mode selector is in the starting position and the safety brake device is in its standby state with the brake released, the control device will block the engine operation.
  • the arranged on the mode selector position sensor detects an inserted starting position of the mode selector; in this starting position is provided to the internal combustion engine via a Startanreichtation an energy rich, enriched mixture to allow a safe start.
  • control device is generally understood a device that ensures the engine operation of the internal combustion engine; Therefore, the control device may include both the fuel supply, the mixture preparation, the ignition of the mixture and / or further necessary for the operation of the internal combustion engine via which, for. B. by inactivation, engine operation of the engine is excluded.
  • the control device comprises a connected to a spark plug ignition module, which is switched off at start position of the mode selector and standing in the standby safety brake device (brake released), ie switched inactive.
  • the control device comprises a connected to a spark plug ignition module, which is switched off at start position of the mode selector and standing in the standby safety brake device (brake released), ie switched inactive.
  • the control device comprises a connected to a spark plug ignition module, which is switched off at start position of the mode selector and standing in the standby safety brake device (brake released), ie switched inactive.
  • the control device comprises a connected to a spark plug ignition module, which is switched off at start position of the mode selector and standing in the standby safety brake device (brake released), ie switched inactive.
  • the control device comprises a connected to a spark plug ignition module, which is switched off at start position of the mode selector and standing in the standby safety brake device (brake released), ie switched inactive.
  • the mixture can not
  • the ignition module is switched inactive by connecting a short-circuit contact to ground
  • the sensors themselves switch an electrical contact and can connect directly to ground by appropriate electrical circuitry.
  • the position sensor and / or the operating sensor as a switch, z. B. designed as a microswitch
  • the contacts of the sensors of mode selector and safety brake device form an electrical series connection, which connect a short-circuit contact of the ignition module to ground.
  • the series connection of the contacts of the sensors is arranged as a parallel branch to a short circuit switch of the ignition module, wherein the short-circuit switch and the series connection are preferably at a common ground point.
  • an optical display is provided, which is preferably designed as an LED.
  • a position sensor and / or an operating sensor may be formed by a non-contact sensor, wherein suitably the output signals of the sensors and a short-circuit switch of a logic evaluation circuit are supplied, which switches a switch for connection to ground.
  • control device may comprise a fuel valve which is switched to a blocking state at start position of the mode selector and in the standstill safety brake device (released brake), so that the fuel supply is inactive, ie no fuel for providing a fuel / Air mixture flows.
  • Fig. 1 shown hand-held, portable implement 1 is a motor chain saw; this stands as an embodiment for other tools such as cutters, brush cutters, hedge trimmers or the like. To be covered by the general term working device.
  • Trained as a motor chain saw 2 implement 1 consists essentially of a housing 3, which has a rear handle 4 in the longitudinal direction of the implement 1.
  • the housing 3 is spanned by a bow handle, which forms a front handle 5.
  • a release lever 18 is arranged for a safety brake device 19, as shown schematically in FIG Fig. 2 is shown.
  • an internal combustion engine 20 is arranged as a drive motor, as in Fig. 2 is shown schematically.
  • the drive motor is preferably a one-cylinder two-stroke engine and consists in the embodiment of a cylinder 21 with a piston 22 and a crankcase 23 with a crankshaft 15.
  • the crankshaft 15 is rotatably mounted in the crankcase 23 and drivingly connected at one end 14 with a clutch 11, the shown embodiment, a centrifugal clutch 12 is.
  • the drive part 13 of the clutch 11 is connected to the crankshaft 15 and is overlapped by a driven part 16, which drives the drive tool.
  • the working tool 8 the saw chain 9, which is driven by a drive pinion 10 which rotates with the output member 16.
  • the clutch 11, in particular the output part 16 of the clutch 11, the safety brake device 19 is assigned, which consists of a the output member 16 looping brake band 24.
  • the brake band 24 is - is the safety brake device 19 triggered by the release lever 18 - applied in the direction of arrows 39 to the output member 16; the brake band 24 wraps around the output member 16.
  • the brake band 24 is applied, the output member 16 is blocked, so it can not rotate.
  • the working tool 8 stands still.
  • the piston 22 bounded in the cylinder 21 a combustion chamber 25 into which a spark plug 26 protrudes, which is driven by an ignition module 27.
  • the ignition module 27 is fed by a generator 28 which is arranged at the other end 29 of the crankshaft 15.
  • the fuel / air mixture necessary for the operation of the internal combustion engine 20 is supplied to the combustion chamber 25 via a device for mixture preparation, which in the exemplary embodiment is a carburetor 50.
  • a device for mixture preparation which in the exemplary embodiment is a carburetor 50.
  • the carburetor 50 sucks in combustion air, which is admixed with fuel in the carburetor housing, which is supplied via a fuel line 52.
  • a fuel line 52 About an intake passage 53, the treated mixture in sucked in the crankcase 23, to then - in accordance with the known in two-stroke engines crankcase scavenging - flow over the piston 22 controlled overflow 54 into the combustion chamber 25.
  • a particular electromagnetically controlled fuel valve 55 To meter the amount of fuel, it may be advantageous to arrange in the fuel line 52 a particular electromagnetically controlled fuel valve 55.
  • the control of the opening times of the fuel valve 55 is z. B. via a control device 60th
  • control device 60 - or assemblies of the control device 60 such as an ignition module 27 or a control of the fuel valve 55 - locked, turned off or otherwise inactive, the internal combustion engine 20 is not operational; the engine 20 is switched off, the engine operation is disabled.
  • the inactive switching of the control device 60 thus corresponds to an engine shutdown or the blocking of the engine operation.
  • a short-circuit line 30 is provided with a start-up circuit 40 according to the invention z. B. according to Fig. 3 connected is.
  • an ignitable fuel / air mixture is conveyed into the combustion chamber 25 and compressed by the upward-moving piston 22.
  • a spark is triggered by the ignition module 27 on the spark plug 26, the mixture ignites and the piston 22 is after powered down.
  • a connecting rod 22 a the up and down movement of the piston 22 is converted into a rotational movement of the crankshaft 15.
  • a mode selector 31 is provided on the implement, which is to operate in the three operating positions I, II and III via an operating lever 32 ( Fig. 1 ).
  • the operating lever 32 actuates a short-circuit switch 33 (FIG. Fig. 3 ), which always connects the ignition module 27 to ground 34 when its contact 35 is closed.
  • the short-circuit switch 33 is connected according to the start-up safety circuit 40 to the short-circuit line 30 of the ignition module 27. Whenever the contact 35 of the short-circuit switch 33 establishes the connection to ground 34, the ignition module 27 is short-circuited and thus switched off (inactive); Motor operation is disabled.
  • the short-circuit switch 33 In the position II of the operating lever 32 of the mode selector 31, the short-circuit switch 33 is open, the ignition module 27 operates and the internal combustion engine is in operation; the engine operation is enabled.
  • a start position III of the mode selector 31 is provided; If the operating lever 32 is moved into the starting position III, the internal combustion engine and the mixture-forming device - in the exemplary embodiment of the carburetor 50 - are transferred into a starting mode. In such a startup operation, the mixture is z. B. enriched, so enriched with fuel.
  • the starting position III of the mode selector 31 is controlled by a position sensor 43 (FIG. Fig. 1 ) detected in the embodiment shown as a switch, in particular as a microswitch with a switching contact 44 ( Fig. 3 ) is trained.
  • the switching contact 44 is according to Fig. 3 electrically connected in the starting safety circuit 40. Whenever the operating lever 32 is pivoted to the starting position III, the contact 44 of the position sensor 43 is closed.
  • the position sensor 43 is arranged directly on the operating lever 32 of the mode selector 31, such as Fig. 1 shows. It may also be appropriate to the position sensor 43 z. B. to a choke valve of the carburetor 50 or to a throttle valve of the carburetor 50 to detect their starting position; the starting position of the choke and / or throttle valve corresponds to the starting position of the Trostellstellers 31.
  • the starting position can, for. B. also be detected by detecting the position of a linkage or other adjusting means to move to set a starting position.
  • an operating sensor 47 (FIG. Fig. 1 ), which is assigned to the safety brake device 19 and in the illustrated embodiment z. B. on the release lever 18 of the safety brake device 19 is arranged. Whenever the release lever 18 is switched to its standby state B, the contact 48 of the operating sensor 47 closes.
  • the brake band 24 (FIG. Fig. 2 ) on the output part 16 of the clutch 11 and brakes the driven working tool 8 to a standstill, thus blocking the working tool 8 at a movement.
  • the contact 48 (FIG. Fig. 3 ) of the safety brake device 19 associated operating sensor 47 open.
  • the short-circuit line 30 is connected via the series circuit 37 to a ground point 36.
  • the series circuit 37 thus forms a parallel branch to the short-circuit switch 33. It may be expedient to connect the short-circuit switch 33 and the series circuit 37 to a common ground point 38.
  • Fig. 4 schematically the function of the start-up safety circuit 40 is shown.
  • the lower dashed line 43 ' represents the output signal S 1 of the switching state of the position sensor 43 of the mode selector 31 again.
  • the overlying dashed line 47 ' is the output signal S2 of the operating sensor 47 of the safety brake device 19 again.
  • the dotted line 27 ' indicates the operating state of the ignition module 27, while the upper, solid line 41' represents the state of an optical display 41, which is an LED 42 controlled by the ignition module 27 in the illustrated embodiment.
  • the mode selector 31 is transferred by pivoting the operating lever 32 into the starting position III, the contact 44 closes; the position sensor 43 is turned on.
  • the safety brake device 19 in its standby position B, as in dotted line in Fig. 1 is shown, the corresponding contact 48 of the operating sensor 47 is closed, and the short-circuit line is connected via the closed contacts 44 and 48 to the ground point 36.
  • the ignition module 27 is inactive; the ignition switched off.
  • the engine 20 can not be put into operation; Motor operation is disabled.
  • the safety brake device 19 Only when at time t 2, the safety brake device 19 is triggered, the brake is thus applied and thus the working tool 8 rotatably fixed, opens the contact 48 of the operating sensor 47 of the safety brake 19, so that the ground connection to the short-circuit line 30 of the ignition module 27 is interrupted.
  • the ignition module 27 is active; the ignition is working and the engine 20 can be put into operation.
  • the contact 44 of the position sensor 43 of the mode selector 31 also opens. Since the series circuit of the sensors 43 and 47 is already opened by the opened contact 48 is opened, the state change of the position sensor 43 of the mode selector 31 has no further effects.
  • the mode selector 31 moves into the starting position III, the contact 44 of the position sensor 43 closes, so that in turn both contacts 44 and 48 of the series circuit 37 are closed, whereby the ignition module 27 becomes inactive by connecting the short-circuit line 30 to the ground point 36; the ignition is switched off and the engine operation is disabled.
  • the control device 60 is inactive; the engine shutdown is activated, thus the engine operation is blocked.
  • the state of the locked engine operation, z. B. by the inactive control device 60, in the embodiment, a switched off ignition, is displayed optically, z. B. by the LED 42.
  • the LED 42 lights up whenever the ignition is off, so the engine operation is locked.
  • the optical display 41 is thus turned on in the periods from t 1 to t 2 and t 5 to t 6 .
  • an evaluation unit 45 is shown, to which the signal S1 of the position sensor 43 and the signal S2 of the operating sensor 47 are supplied.
  • the signal of the short-circuit switch 33 is switched to turn off the engine 20.
  • the sensors can be designed as non-contact sensors. If the condition prevails that the mode selector 31 is in start position III and the safety brake device 19 is in its standby state B with the brake released, the switch 46 is closed and the short-circuit line 30 is connected to ground 34.
  • the control device is inactive by the inactivation of the ignition module 27, ie by turning off the ignition module 27 inactive; At the spark plug 26, no spark can form.
  • the engine 20 can not be started, so do not go into operation; Motor operation is disabled.
  • the state of the inactive control device or of the inactive ignition module 27 is indicated by the visual display 41, which may be embodied as an LED, as in the exemplary embodiment Fig. 3 shown.
  • the engine operation may also be disabled by the control device 60 by the fuel valve 55 being turned off or kept closed.
  • the control device 60 is switched inactive, so that no ignitable mixture can flow into the combustion chamber, as a result of which an engine operation is prevented.

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)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP13002890.5A 2012-06-28 2013-06-05 Circuit de sécurité de démarrage dans un appareil de travail doté d'un moteur à combustion interne Active EP2679801B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012012827.4A DE102012012827A1 (de) 2012-06-28 2012-06-28 Startsicherheitsschaltung in einem Arbeitsgerät mit einem Verbrennungsmotor

Publications (3)

Publication Number Publication Date
EP2679801A2 true EP2679801A2 (fr) 2014-01-01
EP2679801A3 EP2679801A3 (fr) 2017-01-11
EP2679801B1 EP2679801B1 (fr) 2019-10-30

Family

ID=48626243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13002890.5A Active EP2679801B1 (fr) 2012-06-28 2013-06-05 Circuit de sécurité de démarrage dans un appareil de travail doté d'un moteur à combustion interne

Country Status (5)

Country Link
US (1) US9005083B2 (fr)
EP (1) EP2679801B1 (fr)
CN (1) CN103527379B (fr)
DE (1) DE102012012827A1 (fr)
RU (1) RU2629106C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3354892A1 (fr) * 2017-01-30 2018-08-01 Andreas Stihl AG & Co. KG Outil de travail portatif comprenant un moteur à combustion et un dispositif de démarrage électrique

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DE102012012798B4 (de) 2012-06-28 2014-11-13 Andreas Stihl Ag & Co. Kg Arbeitsgerät mit einer Bremseinrichtung
DE102012012799A1 (de) 2012-06-28 2014-01-02 Andreas Stihl Ag & Co. Kg Arbeitsgerät mit einer Bremseinrichtung
DE102012012801A1 (de) 2012-06-28 2014-01-02 Andreas Stihl Ag & Co. Kg Arbeitsgerät
SE541417C2 (en) 2017-06-12 2019-09-24 Husqvarna Ab A carburetor assembly start setting detection arrangement

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3354892A1 (fr) * 2017-01-30 2018-08-01 Andreas Stihl AG & Co. KG Outil de travail portatif comprenant un moteur à combustion et un dispositif de démarrage électrique

Also Published As

Publication number Publication date
RU2013127657A (ru) 2014-12-27
DE102012012827A1 (de) 2014-01-02
RU2629106C2 (ru) 2017-08-24
CN103527379B (zh) 2017-06-06
CN103527379A (zh) 2014-01-22
EP2679801A3 (fr) 2017-01-11
US20140005001A1 (en) 2014-01-02
EP2679801B1 (fr) 2019-10-30
US9005083B2 (en) 2015-04-14

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