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
  • F02D41/22—Safety or indicating devices for abnormal conditions
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
  • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
  • E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/40—Engine management systems

Definitions

• the invention relates to a device and a method for controlling the speed of an internal combustion engine in a working device.
• Such tools e.g. a vibratory tamper for soil compaction or a hammer
• a petrol engine for driving, but occasionally also a diesel engine.
• the engine is usually started by actuating the pull cable of a reversing starter. To do this, the operator holds e.g. grasp the tamper with one hand while pulling on the pull rope with the other hand. Since the engine's throttle lever is usually set to full throttle to start, the engine immediately runs at a high speed, which is often even above the operating speed. This closes a centrifugal clutch which couples the engine to the ramming system, whereby the ramming system is put into operation.
• a choke flap is usually closed on the carburetor when starting, which must be opened again to end the starting process. Because the combustion mixture is over-greased immediately after starting, the engine runs out of round, which leads to irregular, uncontrolled movements of the rammer. In this state, the operator must try to reach and operate the choke lever located below the controls on the carburetor, causing him to head and arm dangerously close to the unpredictable tamper. This activity is also made more difficult by the fact that it is necessary to reach around, ie release the tamper retaining bracket.
• a device for limiting the speed of an internal combustion engine to a maximum permissible limit speed is described in DE 196 09 536 AI. Exceeding the cut-off speed is detected by a sensor which, via electronics, controls a geared motor which overlaps a throttle lever position and by means of which the position of a throttle valve of the internal combustion engine can be influenced.
• the invention has for its object to provide a device and a method for an implement, in which an uncontrolled starting of the implement and an associated difficult handling when starting, but also in other, e.g. special operating conditions endangering the operator is avoided.
• a device for controlling the speed of an internal combustion engine in a working device is specified, with a detection device for detecting a special operating state of the working device caused by the action of outside the working device, and with an adjusting device that can be controlled by the detection device for setting the engine speed to a safety speed below an operating speed. number of internal combustion engine.
• the detection device makes it possible to detect a special operating state of the implement, e.g. starting the implement, but also registering dangerous conditions by releasing the handles of the implement or tipping the implement, whereupon a corresponding signal is sent to the adjusting device, which reduces the engine speed to a significantly lower and therefore harmless speed, e.g. the idle speed, reduced. Only when the detection device no longer detects a special operating state is it possible for the operator to increase the speed again.
• a state is advantageously recognized in which the implement is started or not properly operated, or one Inclination of the implement outside of a permitted range is detected.
• the detection device is able to register an increase in the speed of the internal combustion engine from a standstill. Furthermore, in a particularly advantageous embodiment of the invention, the detection device can determine when the ignition system of the internal combustion engine is being supplied with energy, which is also interpreted as a starting process.
• This embodiment is particularly suitable for internal combustion engines with a magnetic ignition system, in which the ignition energy is not made available by an external energy source, but is generated directly by a magnetic wheel running on the motor shaft. The presence of ignition energy is then synonymous with exceeding a certain engine speed.
• the detection device has a timing element, by means of which a predetermined period of time after the engine is started is monitored, during which the engine speed is set to the safety speed. Only after the predetermined period has elapsed is it possible for the adjusting device to increase to the operating speed, it being assumed that the motor runs smoothly after the period and that the operator has now gained control over the tamper or over the implement.
• the detection device has at least one switching or scanning unit.
• a switching or push button unit can be a safety bar or handle to be held by the operator.
• Corresponding sensors on the handle are also conceivable, with which it is registered that the operator holds the handle of the implement properly. Only in this case does the recognition device recognize a normal operating state, so that the operating speed can be driven.
• the detection device has a device for determining the position of the implement, in particular the inclined position, and detects a special operating state when a predetermined position limit value is exceeded.
• a method according to the invention for controlling the speed of an internal combustion engine in an implement has the steps:
• Both the device and the method can be used particularly advantageously in a tamper or a hammer with an internal combustion engine.
• a tamper for soil compaction in which the device according to the invention is advantageously used, is operated by a conventional magnetic ignition system, with a magnetic charging pulse being emitted at each crank revolution via a magnetic wheel arranged on the crank. Due to the time interval between the magnetic charging pulses, electronics known per se can detect the motor speed. Depending on the operating state of the engine, the electronics then initiate ignition measures for the desired speed value, for example by setting the ignition timing or by canceling individual ignition pulses. This causes the engine speed to oscillate around the value specified by the electronics. In other known speed controls the throttle position.
• a detection device in the electronics now recognizes that the implement is to be started and, for this purpose, preselects an engine speed which is below the switch-on speed of a centrifugal clutch coupling the engine with the tamper or a hammer system for a hammer.
• This so-called safety speed should in any case be at a comparatively low value below the operating speed in order to ensure that the operator can control the starting implement.
• the recognition device can obtain the knowledge that the engine is to be started in various ways.
• the electronics register a speed transition from standstill to a certain minimum speed.
• the speed increase is interpreted to mean that the operator actuated the reversing starter via the pull rope.
• the electronics recognize the first presence of ignition energy in the ignition system.
• the magnetic ignition system in particular generates its ignition energy with the aid of the magnetic wheel arranged on the crankshaft, so that the presence of ignition energy or an increase in ignition energy is synonymous with an increase in speed.
• a two-point switch or a button is provided, which is normally in a stand-by position, in which the motor rotates at a safe speed, and which must be actuated by the operator to start up the device, whereupon the motor with Operating speed can rotate.
• an additional safety bar can be provided on a handle or handle of the working device, which the operator must hold on for start-up. If the operator is only allowed to operate the device at operating speed if he holds it with both hands, two safety bars can also be provided accordingly.
• safety bars it is expedient in other embodiments of the invention to include sensors, switches or buttons, for example to provide capacitive or optical proximity switches or touch-sensitive handle elements.
• the speed is set in a manner known per se and partially described above.
• the speed of diesel engines can also be controlled.
• the electronics have a timer, which is triggered at the start of the start and only allows the engine to be ramped up to the operating speed after a certain period of time after the engine has started. It is assumed that in the meantime the operator has gained complete control over the implement.
• a measuring arrangement is possible that monitors the concentricity of the motor or the entire implement and only allows the speed to increase to the operating speed if the concentricity is correct.

Landscapes

• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)
• Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
• Road Paving Machines (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)
• Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
• Electrical Control Of Ignition Timing (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7875901

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (16)

Citations (5)

Family Cites Families (7)

• 1998
  • 1998-07-30 DE DE19834443A patent/DE19834443B4/de not_active Expired - Fee Related
• 1999
  • 1999-07-29 US US09/744,466 patent/US6474300B1/en not_active Expired - Fee Related
  • 1999-07-29 WO PCT/EP1999/005445 patent/WO2000006879A1/de not_active Ceased
  • 1999-07-29 EP EP99938377A patent/EP1101027B1/de not_active Expired - Lifetime
  • 1999-07-29 JP JP2000562640A patent/JP2002521609A/ja active Pending
  • 1999-07-29 DE DE59908375T patent/DE59908375D1/de not_active Expired - Lifetime

Patent Citations (5)

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