Classifications

• • 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 specially adapted for starting of engines
  • F02N11/0814—Circuits specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
  • F02N11/0844—Circuits specially adapted for starting of engines comprising means for controlling automatic idle-start-stop with means for restarting the engine directly after an engine stop request, e.g. caused by change of driver mind
• • 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
  • F02N11/04—Starting of engines by means of electric motors the motors being associated with current generators
• • 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
  • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
  • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
  • F02N15/08—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing being of friction type
• • 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
  • F02D41/20—Output circuits, e.g. for controlling currents in command coils
  • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
  • F02D2041/2044—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using pre-magnetisation or post-magnetisation of the coils
• • 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
  • F02D41/04—Introducing corrections for particular operating conditions
  • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
  • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
  • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
  • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
• • 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 method and a device for improving the restart of a vehicle equipped with start-stop operation.
• start-stop system Systems for stopping and restarting internal combustion engines, in particular for the purpose of reducing fuel consumption and exhaust emissions, have become known as the start-stop system.
• a device for improving the start-stop operation of a vehicle is known.
• This has a starter generator of the vehicle associated and connected to the electrical system of the vehicle exciter winding and a control unit.
• the control signals provided by the control unit influence the exciting current flowing through the excitation winding.
• the control unit provides control signals, on the basis of which the excitation winding in the stop phase is supplied with a pre-excitation current.
• a method for biasing an electric machine for an automatic start of an internal combustion engine of a motor vehicle with automatic start-stop system is known.
• the electric machine is biased.
• At least one of the parameters is the start time of the magnetization, amount of the bias current and duration for which a magnetizing current is activated, variable.
• a method for improving the restarting of a vehicle equipped with start-stop operation with the features specified in claim 1, on the other hand, has the advantage that in the case of a restart request occurring during the coasting of the internal combustion engine, the time to restart is kept as small as possible while ensuring that material loads are reduced and material destruction is avoided.
• the safety of road traffic is improved because in the event of a re-start request that already occurs during the coasting of the internal combustion engine, the internal combustion engine can be restarted faster. As a result, the time span within which the vehicle can not be moved out of a danger zone is reduced. Continue Improved customer acceptance of start-stop systems. In particular, the invention leads to a reproducible starting behavior.
• Figure 1 is a flowchart for explaining a method for improving the restart of a vehicle equipped with start-stop operation vehicle
• Figure 2 is a block diagram of an apparatus for improving the restart of a vehicle equipped with start-stop operation.
• the invention relates to a method for improving the re-start of a vehicle equipped with start-stop operation excitation winding having a starter generator of the vehicle and a control unit, is influenced by the control signals of the current flowing through the field winding excitation current, and in which the control unit in a stop phase of the start-stop operation provides control signals, due to which the excitation winding is applied in the stop phase with a Vorerregerstrom, wherein the control unit checks in the presence of occurring during the running out of the engine restart request, if an immediate restart possible and useful is, in the case of a possible and meaningful immediate re-start an immediate re-start in the way and delayed in the event of an impossibility and / or not meaningful immediate re-start the re-start.
• FIG. 1 is a flowchart for explaining a method for improving the restarting of a vehicle equipped with start-stop operation.
• the illustrated method assumes that the internal combustion engine of the vehicle is in operation.
• a query is made as to whether there is a request to switch to the stop mode.
• This request derung comes from a control unit, not shown in the figure 1 and is automatically generated for example at a traffic light stop when predetermined stop conditions are met. This includes, for example, falling below a predetermined speed limit while simultaneously pressing the vehicle brake.
• step S3 the starter generator of the vehicle, which is a belt-driven starter generator or a directly mounted starter generator, is brought into the ready to start state.
• This ready-to-start status enables rapid torque build-up in the event of a restart request occurring during the run-out of the internal combustion engine.
• the excitation current is turned on. Full excitation is possible but not required. Consequently, a partial excitation is preferably set. This partial excitation is preferably variable depending on the current operating state of the vehicle.
• a query is made in a step S4 whether a restart request is present.
• a restart request is triggered, for example, by an actuation of the accelerator pedal.
• step S5 If there is no restart request, then it is ensured in a step S5 that the starter generator, whose excitation winding is supplied with an excitation current, neither outputs an undesirably high electrical power nor an undesirably high mechanical power.
• the starter generator is actively controlled by means of a controlled torque output for the purpose of influencing the run-out behavior.
• the outlet of the engine is controlled either driving or braking, for example, for the purpose of a gentle spout or for the purpose of positioning the crankshaft in a desired angular position.
• a passive behavior of the starter generator can also be brought about by controlling the stator of the starter generator in such a way that the starter generator behaves as neutral as possible at its mechanical interface.
• a query is made as to whether the starter generator has come to a standstill. If this is the case, then, according to a step S7, the starter generator is kept in the ready to start state by ensuring that an excitation current remains in order to accelerate a possibly occurring restart.
• the height of the excitation current can be less than maximum.
• a variable adjustment of this excitation current in dependence on the current operating state of the internal combustion engine.
• step S8 a query is made in a step S8 as to whether an immediate restart is possible and meaningful.
• a criterion for whether an immediate restart is possible and useful it is checked whether the current speed of the internal combustion engine is within a predetermined speed range. Alternatively or additionally, it is checked whether the crankshaft angle is within a predetermined angular range. Alternatively or additionally, serves as a criterion for whether an immediate restart is possible and useful, the current state of the electrical system and the nature and performance of the internal combustion engine.
• An impossible and not sensible immediate restart is recognized, for example, when the instantaneous rotational speed of the internal combustion engine lies in the region of the resonance frequency of the dual-mass flywheel arranged on the crankshaft.
• a possible and meaningful immediate restart is recognized, for example, if the instantaneous crankshaft angle is such that the compression work can be used and the instantaneous speed of the internal combustion engine is within a desired speed range.
• a possible and meaningful immediate restart is also recognized, for example, when there are special operating states of the internal combustion engine or of the vehicle drive train. For example, it is possible to wait until a throttle valve or another actuator on the internal combustion engine is set such that there is a favorable condition for a restart.
• step S9 the playback start is initiated by the starter being correspondingly activated. Since the excitation current is already switched on and provides for a rotor flux, only a corresponding control of the stator is required. Since the time constant of the stator is low, this procedure achieves a considerable time saving on restarting.
• step S8 If, on the other hand, it is detected in the query in step S8 that an immediate restart is not possible or not sensible, then a query is made in a step S10 as to whether braking of the internal combustion engine is required, preferably with the aid of a braking torque established by the starter generator. This is the case, for example, when the speed of the internal combustion engine is still greater than a predetermined speed threshold value.
• step S10 If it is detected in the query in step S10 that braking is required, then according to step S1 1 it is ensured that the required braking torque is built up.
• step S12 it is ensured that the internal combustion engine runs out.
• the control unit ensures that the starter generator, whose excitation winding is supplied with an exciting current, neither emits nor absorbs an undesirably high electrical power or an undesirably high mechanical power.
• the starter generator is controlled by means of a controlled rotation in order to influence the run-out behavior. torque output actively activated.
• the outlet of the engine is controlled either driving or braking, for example, for the purpose of a gentle spout or for the purpose of positioning the crankshaft in a desired angular position.
• step S1 After performing steps S2, S7, S9, S1 and S12, a return to step S1 occurs. Even if it is detected in the query in step S6 that the starter generator has not come to a standstill, there is a return to step S1.
• control unit which is designed for carrying out the method described above.
• This control unit is - as shown below with reference to Figure 2 - via a communication line with other control devices and sensors of the vehicle in connection and is connected via a further line to the starter generator of the vehicle.
• FIG. 2 is a block diagram of a device for improving the restarting of a vehicle equipped with start-stop operation.
• the illustrated apparatus comprises a belt-driven starter generator 1, a pulley 2 connected thereto, a drive belt 3, a deflection and tensioning pulley 4, a pulley 5 arranged on the crankshaft of the vehicle, a control unit 6, a line 7, a crankshaft 8 Dual mass flywheel 9 and a communication line 10.
• the control unit 6 is intended to control the method described with reference to FIG.
• the starter generator 1 is connected to the crankshaft 8 of the internal combustion engine of the vehicle via a belt drive, which includes the belt pulley 2, the drive belt 3, the deflection and tension pulley 4 and the pulley 5.
• a flywheel 9 which is preferably a two-mass flywheel mounted. In such a device, it is possible to transfer mechanical power between the crankshaft and the starter generator.
• the control unit 6 is electrically connected via the line 7 to the starter generator 1. It can also be integrated in the starter generator 1. By means of this control unit 6, the power-side control of the starter generator is realized.
• the control unit 6 has a built-in semiconductor switches pulse inverter and a logic part. This includes a controller on which using a program code, the above-described method is executed.
• the control unit 6 is connected via the communication line 10 with other control devices and sensors of the vehicle and exchanges with these data.
• the control unit 6 communicates with an engine control unit, a transmission control unit, a vehicle electrical system control unit and sensors for detecting the crankshaft angle and the battery condition.
• the starter generator can also be mounted directly on the internal combustion engine or on the transmission of the motor vehicle.
• the starter generator is connected by means of a chain, a shaft or a gear to the engine or the transmission.
• the invention enables a quick restart if there is already a restart request during the run-out of the internal combustion engine.
• the driver of the motor vehicle can rest assured that the internal combustion engine is always available to him. This is achieved by allowing the starter to accelerate the engine by applying torque before the engine has stalled. This ensures that no disturbing or even material-damaging operating conditions occur.
• Dual mass flywheels inherently suffer from a resonant frequency because they form a dual mass torsional oscillator.
• This resonance frequency is usually above the speed at which an internal combustion engine ignites for the first time, but below the idling speed of the internal combustion engine.
• the resonance range is traversed both at the start and when stopping the engine.
• a stay of the Crankshaft speed in the resonance range leads to clearly noticeable vibrations of the internal combustion engine. Damage to components up to the destruction of these components can not be ruled out. Operating states of this kind in which damage or even destruction of the components can occur are avoided in the procedure according to the invention.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

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ID=43064448

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (13)

Citations (7)

Family Cites Families (3)

• 2009
  • 2009-10-21 DE DE102009045886A patent/DE102009045886A1/de not_active Withdrawn
• 2010
  • 2010-08-31 IN IN1958DEN2012 patent/IN2012DN01958A/en unknown
  • 2010-08-31 WO PCT/EP2010/062712 patent/WO2011047916A1/de not_active Ceased
  • 2010-08-31 US US13/501,575 patent/US20120259535A1/en not_active Abandoned
  • 2010-08-31 CN CN2010800473749A patent/CN102575631A/zh active Pending
  • 2010-08-31 EP EP10751635A patent/EP2491240A1/de not_active Withdrawn

Patent Citations (7)

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