Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
  • F02D31/001—Electric control of rotation speed
  • F02D31/002—Electric control of rotation speed controlling air supply
  • F02D31/003—Electric control of rotation speed controlling air supply for idle speed control
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
  • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines
  • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
  • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
  • B60K6/48—Parallel type
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
  • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
  • B60W30/18—Propelling the vehicle
  • B60W30/18009—Propelling the vehicle related to particular drive situations
  • B60W30/18027—Drive off, accelerating from standstill
• • 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
  • F02B75/06—Engines with means for equalising torque
• • 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
  • F02P5/00—Advancing or retarding ignition; Control therefor
  • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
  • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
  • F02P5/15—Digital data processing
  • F02P5/1502—Digital data processing using one central computing unit
  • F02P5/1508—Digital data processing using one central computing unit with particular means during idling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
  • B60W2710/00—Output or target parameters relating to a particular sub-units
  • B60W2710/06—Combustion engines, Gas turbines
  • B60W2710/0605—Throttle position
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
  • B60W2710/00—Output or target parameters relating to a particular sub-units
  • B60W2710/06—Combustion engines, Gas turbines
  • B60W2710/0616—Position of fuel or air injector
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
  • B60W2710/00—Output or target parameters relating to a particular sub-units
  • B60W2710/06—Combustion engines, Gas turbines
  • B60W2710/0616—Position of fuel or air injector
  • B60W2710/0622—Air-fuel ratio
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
  • B60W2710/00—Output or target parameters relating to a particular sub-units
  • B60W2710/06—Combustion engines, Gas turbines
  • B60W2710/0644—Engine speed
  • B60W2710/065—Idle condition
• • 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
  • F02D2250/18—Control of the engine output torque
  • F02D2250/24—Control of the engine output torque by using an external load, e.g. a generator
• • 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
• • 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
  • Y02T10/60—Other road transportation technologies with climate change mitigation effect
  • Y02T10/62—Hybrid vehicles

Definitions

• the invention relates to a method for operating a hybrid motor vehicle with an internal combustion engine and at least one electrical machine, wherein at least one of the electrical machines applies a varying torque to the internal combustion engine in idle mode in such a way that rotational irregularities of the internal combustion engine are reduced in idle mode, according to the preamble of Claim 1.
• the internal combustion engine is generally not switched off in the standstill phases of the motor vehicle and continues to run in idle mode. Part of the energy given off by the motor is used for. the supply of the vehicle electrical system or for comfort functions, such as the air conditioning system.
• the engine since the engine requires the largest part of the energy contained in the amount of fuel introduced to keep the engine running or to compensate for heat and friction losses and also runs in a range of thermodynamically poor efficiency, it is energetically unfavorable to stop the engine to let the vehicle continue to run. For this reason, there are already vehicles with a start-stop function that switch off the internal combustion engine when the vehicle is at a standstill in order to reduce fuel consumption.
• hybrid vehicles too, the internal combustion engine is typically switched off in a standstill phase using a start / stop function.
• the advantage here is that hybrid vehicles have significantly more powerful electric motors compared to a conventional starter, which enables greater comfort, especially when starting the engine.
• the electrical machine can be connected to the engine crankshaft in various ways. For example, it can be connected via a clutch or directly to the crankshaft of the engine, or it can be coupled via a belt drive or a transmission.
• the electrical consumers are supplied by batteries or other electrical energy stores, which are recharged in a subsequent driving operation at more efficient operating points of the internal combustion engine. In this way, a noticeable reduction in fuel consumption can be achieved.
• the mechanical drive of an air conditioning compressor that takes place via the belt drive of the internal combustion engine may require the internal combustion engine to continue running. Even when the batteries are in a lower state of charge, it may be necessary, particularly in the case of very long standstill phases, to let the internal combustion engine continue to run at idle or to start it again.
• the exhaust gas cleaning system for example, must have reached its operating temperature so that when the internal combustion engine is restarted, there are no impermissibly high exhaust gas pollutant emissions.
• One way of reducing fuel consumption when idling is to lower the idling speed of the internal combustion engine as much as possible.
• the idling speed can only be reduced to a certain value, since otherwise the irregularities in the torque output of individual cylinders increase considerably, so that the running quality becomes very poor or the engine stops.
• the engine running is made more difficult by scattering in the injected fuel mass between individual cylinders, the low cylinder fillings, the low intensity of the combustion chamber gas flows and increased residual gas contents in the combustion chambers.
• the idle speeds are therefore typically in the range from 750 to 900 min "1.
• the idle speed can be set lower compared to intake manifold injecting engines, because due to the direct introduction of the fuel into the combustion chamber, it is very precise
• the idling speed can also be set somewhat lower due to the higher number of combustion events per crankshaft revolution.
• the idle speed in series engines is set at a certain distance from a lower or minimum, predetermined idle limit speed.
• torque reserves are often used.
• the ignition angle is set later than is necessary for torque-optimized or consumption-optimized operation.
• the cylinder charge In order to maintain the target idling speed, the cylinder charge must be increased at the same time. With a fast load request, the ignition angle can now be prematurely increased, which leads to a higher torque with practically no time delay, since the ignition angle can be adjusted very quickly, that is to say during the subsequent work cycle.
• both the safety margin of the idle speed from the minimum idle speed limit and the torque reserve undesirably lead to an increase in fuel consumption.
• a drive system for a hybrid motor vehicle with an internal combustion engine and an electrical machine that applies a varying torque to the internal combustion engine is known, so that rotational irregularities of the internal combustion engine are reduced.
• the electrical machine coupled to the internal combustion engine is controlled in such a way that it applies a varying torque that counteracts the torque fluctuations of the internal combustion engine.
• the object of the invention is to reduce the idle consumption of the hybrid system when operating a hybrid vehicle, to improve the interaction between the internal combustion engine and the electrical machine, and at the same time to maintain the desired driving comfort.
• the internal combustion engine is operated at an ignition angle and fill level that is optimized for this operating state without a delay adjustment to build up a torque reserve.
• This has the advantage that an extremely low idling speed can be selected by dispensing with the otherwise usual retardation of the ignition angle and the associated increase in the degree of filling, whereby a reduction in fuel consumption while maintaining the desired operating and driving comfort is achieved.
• the ignition angle is expediently set in idle mode for optimum operation of the internal combustion engine.
• the internal combustion engine is preferably operated in idle mode with lambda equal to 1.
• a correspondingly high starting torque is made available from at least one of the electrical machines when starting, which is preferably impressed in the period of time that the internal combustion engine needs to build up the charge.
• a speed control by interventions via an ignition path, a fuel path and / or a filling path is combined with a speed control by means of at least one of the electrical machines.
• speed control by means of at least one of the electrical machines is superimposed on the conventional speed control via an ignition path, a fuel path and / or a filling path, wherein the speed control by means of at least one of the electrical machines preferably only reacts to stochastic, strong speed drops.
• An idling speed of the internal combustion engine is expediently based on an idling limit speed predetermined for the internal combustion engine, at which the internal combustion engine has a quiet idling and sufficient reserves for a starting process without a drop in speed, by at least 50 min "1 , in particular at least in 100 min " 1 , in particular at least 200 min "1 lowered.
• a hybrid vehicle with additionally at least one electric machine and an internal combustion engine
• the electrical machine can provide a high torque (positive and negative) precisely in the lower speed range, this offers the possibility of advantageously supporting the idling of an internal combustion engine.
• the electromotive moments can be built up and broken down very quickly, that is to say within a few 10 ms, which results in the possibility of compensating for the torque fluctuations or the resulting speed fluctuations of an internal combustion engine when idling.
• the invention it is therefore proposed to reduce the idling speed of an internal combustion engine by at least 50 min "1 , preferably by at least 100 min " 1 and particularly preferably by at least 200 min "1.
• the torque nonuniformities or the resulting speed fluctuations are controlled by a combined speed control
• a combination of the conventional speed control of the internal combustion engine with a superimposed speed control of the electrical machine is conceivable, which reacts to speed drops due to stochastically inadequate combustion events and thus prevents impermissible speed drops the conventional torque reserve (ignition angle reserve) can no longer be used due to the high drive torque of the electrical machine
• the starting process can also be supported from a low idle speed with little or no torque reserve, so that there is no loss of comfort due to speed drops.
• the proposed method thus enables a further reduction in the fuel consumption of hybrid vehicles or drive concepts with a combination of an internal combustion engine and an electrical machine.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Transportation (AREA)
• Theoretical Computer Science (AREA)
• Signal Processing (AREA)
• Automation & Control Theory (AREA)
• Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
• Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

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Family Applications (1)

Country Status (7)

Cited By (4)

Families Citing this family (17)

Citations (4)

Family Cites Families (5)

• 2004
  • 2004-04-03 DE DE102004016559A patent/DE102004016559A1/de not_active Withdrawn
  • 2004-12-08 JP JP2007505392A patent/JP2007530354A/ja active Pending
  • 2004-12-08 EP EP04803606A patent/EP1735172B1/de not_active Expired - Lifetime
  • 2004-12-08 DE DE502004009737T patent/DE502004009737D1/de not_active Expired - Lifetime
  • 2004-12-08 WO PCT/EP2004/013925 patent/WO2005105500A1/de not_active Ceased
  • 2004-12-08 AT AT04803606T patent/ATE435771T1/de not_active IP Right Cessation
  • 2004-12-08 CN CNB2004800426780A patent/CN100488795C/zh not_active Expired - Lifetime
• 2006
  • 2006-09-25 US US11/526,430 patent/US7305965B2/en not_active Expired - Lifetime

Patent Citations (4)

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