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
  • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
  • F02N11/0825—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state
• • 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
  • B60W2510/00—Input parameters relating to a particular sub-units
  • B60W2510/24—Energy storage means
  • B60W2510/242—Energy storage means for electrical energy
  • B60W2510/244—Charge state
• • 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
  • 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
  • F02N11/0862—Circuits specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery
• • 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
  • F02N2200/00—Parameters used for control of starting apparatus
  • F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
  • F02N2200/063—Battery voltage
• • 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
  • F02N2250/00—Problems related to engine starting or engine's starting apparatus
  • F02N2250/02—Battery voltage drop at start, e.g. drops causing ECU reset
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
  • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
  • G01R31/3644—Constructional arrangements
  • G01R31/3647—Constructional arrangements for determining the ability of a battery to perform a critical function, e.g. cranking
• • 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 for operating a start-stop control for a start-stop operating mode of an internal combustion engine in a motor vehicle, wherein the internal combustion engine is started with a starting device fed by an electrical energy source.
• the invention also relates to a start-stop control with a switching logic for a start-stop operating mode of an internal combustion engine in a motor vehicle, wherein the internal combustion engine is startable with a starting device fed by an electrical energy source.
• the invention further relates to a
• the internal combustion engine is stopped especially for a brief interruption of a driving operation of the vehicle and restarted for further travel of the vehicle with an electrically driven starting device, in particular with a starter motor.
• the starting device is powered by an electrical energy source, such as a battery.
• Such an interruption may be caused, for example, by a red phase of a traffic light at which the vehicle must stop.
• DE 10 2005 021 227 A1 describes a start-stop control, in which the internal combustion engine of a motor vehicle is turned on for starting with an electrically operated starter motor.
• DE 10 2004 004 173 A1 describes a method and a device for detecting a disconnected or defective battery in a motor vehicle by means of an evaluation unit for evaluating a frequency of a ripple of a vehicle electrical system voltage.
• a concept of the invention is that an operating state of an electric power source is detected and a stop release remains activated or becomes, if the operating state of the electric power source for starting the internal combustion engine with the starting device is sufficient.
• a stop release in a start-stop operating mode of the motor vehicle, a stop of the internal combustion engine, for example in the case of a brief interruption of the driving operation, can be controlled, namely by allowing a stop of the internal combustion engine when the stop is activated or, if the stop is deactivated Release is not allowed.
• the operating state of the energy source can be considered for a stop of the internal combustion engine.
• the electrical energy source can supply enough electrical energy for a restart with an electric starting device.
• the reliability of the start-stop operating mode is increased and an unintentional end of the driving operation is prevented.
• a start-stop control in that the start-stop control, in particular for a method mentioned above or below, is in operative connection with a measuring device and an evaluation device.
• Device for detecting the operating state of the electric power source and in operative connection with the stop release is formed, which remains activated if the operating state of the electric power source for a start of the internal combustion engine with the starting device is sufficient.
• the measuring device With the measuring device, the respective current operating state of the energy source can be detected and it can be checked with the evaluation device, whether the respectively determined operating state of the energy source allows a start of the internal combustion engine.
• the reliability of the start-stop operating mode is increased by the measurement and evaluation can gain accurate information about the respective actual operating state of the energy source, namely currently in time proximity to a startup process, for which the energy source is needed ,
• the operating state of the electrical energy source thus includes, in particular, information about the ability of the energy source to be able to deliver a certain amount of power over a specific time, namely at least the power or energy required to start the internal combustion engine with the electric starting device.
• the electrical energy source may be a device that provides electrical energy by conversion from another form of energy, such as a fuel cell.
• the electrical energy source is preferably in the form of an electrical energy store, in particular as a battery or as a power capacitor, for example in the form of a double-layer capacitor.
• energy can be stored in an energy store, preferably electrical energy, for example from a generator, which can then be used for starting the internal combustion engine in the start-stop operating mode.
• a substantially independent energy source can be realized, which in particular does not have to be supplied with energy directly from outside the vehicle, for example by refueling with an energy source.
• the reliability of the start-stop operating mode can be increased by the, in particular in-vehicle and self-sufficient, energy storage and reduce maintenance.
• a state of charge of the electrical energy source is measured as the operating state, the state of charge being a measure of the electrical energy that can still be delivered by the energy source until it is exhausted.
• the state of charge can thus, for example, for a fuel cell as an energy source, the amount of fuel or, preferably, in a
• the measuring device is designed as a voltage measuring device, so that with the voltage measuring device of the operating state, ie in particular the state of charge, the electrical energy source can be measured.
• the voltage measuring device of the operating state ie in particular the state of charge
• the electrical energy source can be measured.
• a voltage measuring device is simple and inexpensive, also with high precision, feasible, so that the operating state of the power source can be accurately determined and thus the reliability of the start-stop operating mode is increased.
• the operating state of the electrical energy source is measured during a discharge process, that is, while the power source electrical energy is removed and the energy source is thus electrically charged.
• a discharge process that is, while the power source electrical energy is removed and the energy source is thus electrically charged.
• an internal resistance of the energy source can be taken into account during the discharge process by the current flow and the operating state, in particular the state of charge, can be determined more accurately. This increases reliability in determining the operating state.
• the operating state in particular by a voltage measurement, during a startup of the internal combustion engine can be measured, in particular at a start the Internal combustion engine with a starter motor of the starting device. Since energy is taken from the energy source during a starting process, it can be determined immediately whether the operating state of the energy source for a further start of the
• a regeneration the energy source for example, a charging of a battery
• the stop release will be activated only, so a stop of the engine will be allowed only if the operating state of the electrical energy source for a start of the engine with the starting device is sufficient.
• a critical operating state of the energy source in particular on repeated or prolonged occurrence, for example by means of a display in an instrument panel of the motor vehicle, be pointed out to replace the energy source or to overtake in a maintenance.
• the operating state of the electrical energy source can be detected during operation of the internal combustion engine.
• the electrical energy requirement of the motor vehicle can be covered by a generator, so that the operating state can be determined undisturbed, ie in particular more accurately, independently of any further use of the energy source.
• the energy source can be regenerated, for example a battery can be charged, so that an improvement in regeneration, for example an increasing state of charge, can be taken into account or even monitored.
• the start-stop operating mode during operation of the internal combustion engine can be adapted to a changing operating state of the energy source, for example by reactivating a previously deactivated stop release after a sufficient regeneration of the energy source.
• the operating state of the electrical energy source is preferably detected at a stop request for a stop of the internal combustion engine, wherein a stop request is in particular a signal for stopping the internal combustion engine, for example at a start-stop
• Operating mode is triggered by holding the motor vehicle, an actuation of a clutch pedal or an idle position of the transmission.
• the stop release in particular only, remains activated if the operating state of the electrical energy source is above a characteristic limit value.
• the characteristic limit value can correspond at least to the energy requirement of the starting device for starting the internal combustion engine. Thus it can be determined with the evaluation by simply comparing the detected operating condition with the limit, whether a start of the internal combustion engine is possible.
• the characteristic limit can be defined by a voltage value, for example about 1 1, 6 V for a battery with a rated voltage of about 12.1 V.
• the characteristic limit value can also be defined as a voltage dip, for example under a voltage of 7.5 V for a battery with a nominal voltage of approximately 12.1 V.
• the operating state of the battery can be determined as and / or from the, preferably maximum, voltage dip when starting the internal combustion engine.
• the operating state of the electric power source is detected, for example, by the voltage measuring device, a battery voltage is measured as the operating state of the battery as an energy source, and with the characteristic limit , For example, 7.5 V is compared. Then, the stop release can be deactivated at least for a certain predetermined operating time, if the operating state falls below the characteristic limit at least once. In this case, the detection and comparison is carried out until the internal combustion engine runs automatically.
• the voltage measuring device detects the starting of the internal combustion engine by detecting a defined voltage value, which may be, for example, 12.7 volts or some other predetermined value, after the voltage dip and because of this Signal or this information is spouted out the starter and the starter motor is no longer energized.
• a defined voltage value which may be, for example, 12.7 volts or some other predetermined value
• the operating state can be detected after the electrical energy source has been discharged for a certain period of time.
• a voltage delivered by the energy store characteristically decreases with the discharge.
• the operating state of the energy source is already determined in time prior to the mentioned test, ie before the first time period, and compared with a second limit value and the test described above is performed only if the operating state is above the second limit value. It is preferred that in a battery as the energy source with the voltage measuring device, a battery voltage is measured and the operating condition of the battery as "in order", that is sufficient for a start of the internal combustion engine, if the battery voltage, the second characteristic limit, for example 12, 7 V. Thus, the power source is not unnecessarily loaded or unloaded to detect the operating state.
• a check of the energy source is performed over a certain period of time, which is preferably predetermined by a first timer. This period of time is for example at least ten seconds. In this case, the energy source can be checked several times, for example, five times or at specific intervals, such as about two seconds.
• the operating state of the energy source is detected and compared with a third characteristic limit value. If the third characteristic limit value is undershot, the stop Disabled disabled and the test, especially if necessary before the end of the first period of time, ended and preferably the timer reset. Otherwise, the stop release remains activated.
• the operating state can be detected as a battery voltage with the voltage measuring device and the third characteristic limit can be defined as a voltage of, for example, 12.4 V.
• the third characteristic limit can be defined as a voltage of, for example, 12.4 V.
• the object is also achieved by a computer program product loadable into a program memory with program instructions for a microcomputer to perform all the steps of the aforementioned methods when the program is executed in the start-stop control.
• the computer program product requires only a few or no additional components in the vehicle and can be implemented as a module in the already existing start-stop control, wherein the computer program product can realize in particular the stop release and / or the switching logic.
• the computer program product has the further advantage that it can easily be adapted to individual and specific customer requirements, and an improvement or optimization of individual method steps, in particular also of the switching logic, is possible with little effort. It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the respectively specified combination but also in other combinations.
• 1 is a schematic circuit diagram of a motor vehicle with a start-stop control, 2 as a flowchart steps of a method for operating the start-stop control,
• FIG. 3 shows a profile of a battery voltage in a method according to FIG. 2, FIG.
• FIG. 4 shows a flowchart of a further exemplary embodiment of the method
• FIG. 5 shows a further course of a battery voltage along a time axis.
• FIG. 1 shows a schematic circuit diagram of a motor vehicle 5 with a motor vehicle
• Start-stop control 1 vehicle electrical system consumers 8 and a voltage measuring device 7 for measuring a battery voltage of a battery 4.
• the start-stop control 1 is formed with a microcomputer 9 as an evaluation device and in operative connection with the voltage measuring device 7, namely for the detection an operating condition of the battery 4.
• the motor vehicle 5 comprises an internal combustion engine 3 with a starting device 2, wherein a motor controller 6 controls the starting and stopping of the internal combustion engine 3.
• the starter device 2 comprises a starter motor 12, which for starting the internal combustion engine 3 by means of a in one
• Sprocket 3a of the internal combustion engine 3 einpurbaren starter pinion 2a is formed.
• the start-stop control 1, the voltage measuring device 7 and the motor controller 6 each individually, in different combinations or as shown, all together in an electronic module, in particular as a controller 10, the motor vehicle be summarized, if necessary also with other, not shown, components of an on-board electronics.
• a switching logic for a start-stop operating mode of the internal combustion engine 3 is realized by means of the microcomputer 9, wherein a stop release is also realized by the microcomputer 9. Due to the start-stop operating mode, the internal combustion engine 3 is switched off in a short holding phase of the motor vehicle 5, for example in a red phase of a traffic light, in order to reduce fuel consumption or CO 2 emissions. The internal combustion engine is switched on again for further travel, as soon as the brake pedal is released, for example.
• the controller 10 includes a method and at least one stop-release device in the start-stop operating mode. If the stop enable is activated, a
• the start-stop control 1 is formed via signal or information lines in operative connection with the engine control 3, to optionally via a corresponding signal to the internal combustion engine by means of the engine control 6 to stop.
• the start-stop control 1 is formed via signal or information lines in operative connection with the engine control 3, to optionally via a corresponding signal to the internal combustion engine by means of the engine control 6 to stop.
• Stop release integrated in the switching logic for the start-stop operating mode and realized by means of the microcomputer 9 in the start-stop control 1.
• the stop release could for example also be formed in the engine control 6.
• the stop enable is deactivated according to the criteria described below and is always activated.
• FIG. 2 shows a flowchart with steps of a method for operating the start-stop control 1.
• a step 20 the internal combustion engine 3 is stationary, and an ignition of the motor vehicle 5 is switched on, that is, the electrical system with the start-stop control 1 and the engine controller 6 is turned on.
• the ignition key is turned to a first level.
• the motor vehicle 5 is either in a state before a so-called cold start, so after a long rest period of the off motor vehicle 5 or the motor vehicle 5 is switched on start-stop operating mode in a short holding phase before a so-called warm start of the engine 3 during a brief interruption a driving operation.
• a start request for example, by pressing a start switch or turning the ignition key to a second stage at a cold start or by releasing the brake pedal or pressing an accelerator pedal for a warm start in a start-stop operating mode.
• the engine 3 is started with the starting device 2 by being turned on with the starter motor 12.
• the starting process ie when starting the internal combustion engine 3, the operating state of the battery 4 is determined by means of the state of charge with the voltage measuring device 7 in a step 23 and evaluated with the microcomputer 9 of the start-stop control 1.
• a battery voltage U is measured by the battery 4, which is discharged during the starting process, at least via the starting device 2.
• the state of charge is defined as "too low” so that the stop release is deactivated in a step 26.
• the blocking of the stop release leads to this in that in the start-stop operation, that is to say for example in the case of a subsequent short holding phase, no corresponding signal for stopping the internal combustion engine 3 is transmitted to the engine control 6 by the switching logic so that the internal combustion engine 3 remains switched on.
• step 24 it is checked in a further step 24 whether the internal combustion engine 3 has been successfully started. If this is the case, then in a step 25 the stop
• a state of charge of the battery 4 is determined as an electrical energy source, and the stop release remains activated only if the operating state of the battery 4 is above the first characteristic limit G1, ie the operating state for a Start of the internal combustion engine 3 with the starting device 2 is sufficient.
• the first limit value G1 and the following limit values are stored in the memory.
• FIG. 3 shows a profile of a battery voltage U of the battery 4 along a time axis t in a method according to FIG. 2, in particular from a start t-1 of cranking 22 up to a time t 3 , to which the Internal combustion engine 3 runs automatically and the starter motor 12 of the starting device 2 is no longer powered from the battery 4.
• the battery voltage Ui is measured.
• the battery voltage Ui breaks.
• a maximum voltage dip, ie a minimum of the battery voltage U 2 , is deactivated with the voltage measuring device 7.
• This minimum battery voltage U 2 is compared at time t 2 of the evaluation device, namely the microcomputer 9, with the first characteristic limit G1, for example, 7.5 V, so that in step 25, the stop release remains activated only if the Battery voltage U is above the first limit G1. This is true in this embodiment, otherwise in step 26 the stop enable would be disabled. In this case, the battery voltage U is evaluated as a state of charge of the battery 4, which represents the operating state of the battery 4 here.
• Another advantage of using the voltage measuring device 7 is that the
• Time t 3 by detecting U 2 of the battery voltage U 3 provides a signal indicating that the internal combustion engine 3 is self-running and the starting device no longer needs to be energized.
• This new measurement signal represents an alternative or cumulative switch-off criterion of the starting device 2.
• step 40 the internal combustion engine 3 is in operation, that is started and the stop release activated. Further, in step 40, for example, the battery 4 may be charged by a generator, not shown.
• step 41 the state of charge of the battery 4 is checked as the operating state with the voltage measuring device 7, wherein optionally the charging of the battery 4 can be terminated or can be continued. If a battery voltage U is greater than a second characteristic limit value G2, for example, 12.7 V, the charge state of the start-stop control 1 by means of the evaluation device, namely the microcomputer 9, as sufficiently determined for a start of the internal combustion engine 3, and Proceeded to a step 42. Otherwise, the stop release is deactivated in a step 47.
• G2 second characteristic limit value
• a first timer is started from zero and runs until a predetermined first period of time, for example about ten seconds, after which the stop release is activated.
• a step 43 it is checked whether the timer has already exceeded the time duration.
• the battery voltage U is measured in a step 44 with the voltage measuring device 7.
• the measured battery voltage U is compared with the microcomputer 9 with a further third characteristic limit G3, for example, 12.4 V, which corresponds for example to a charge state of about 60% of a maximum charge of the battery 4.
• the timer is reset and the operating state of the battery 4, ie the state of charge, is evaluated as too low for a restart with the starting device, so that the stop release is deactivated and the internal combustion engine 3 is started.
• the method is continued, in particular with the charging of the battery 4, with the step 40.
• the stop release is a method that is designed as electronic logic that could trigger a switching off of the internal combustion engine 3 according to certain in-vehicle and possibly-external criteria.
• the step 43 and optionally the step 44 again follow that further measurements of the battery voltage U occur at short time intervals, for example of about two seconds.
• step 43 If the timer exceeds the time duration in step 43, ie if no too low battery voltage U was measured in step 44, the stop enable is activated in step 46, whereupon the internal combustion engine 3 can be stopped by the engine controller 6 as required, if further system conditions of the motor vehicle 5, for example an actuation of a brake pedal, are fulfilled.
• FIG. 5 shows a profile of the battery voltage U of the battery 4 along a time axis t for explaining the step 44 according to FIG. 4.
• the motor vehicle 5 is operated at a higher speed in a driving operation before the time t 5 , so that a not shown Generator provides more power to charge the battery 4 while the internal combustion engine 3 and at the same time to provide the electrical power requirement for electrical loads 8, and at a charging voltage of about 13 V.
• the operating state of Battery 4 sufficient for a start of the internal combustion engine 3, so that the stop release remains activated.
• the motor vehicle in an idle mode, ie operated at a lower speed, so that the required on-board power of consumers 8 is greater than that generated by the generator and the battery 4 via the on-board power consumers 8 is discharged. Consequently, from the time t 5 the state of charge, namely the battery voltage U, the battery 4 continuously decreases, namely, for example, from 12.7 V starting, to a time t 6 , in which the battery voltage U the third characteristic limit G3, for example 12.4 V, reached.
• a battery voltage U above the third limit value G3 corresponds to a charge state of the battery 4 which is sufficient for a start of the internal combustion engine 3, so that in the period between the times t 5 and t 6, the stop release remains activated, provided an end of the previously falls within this period.
• the third characteristic limit value G3 so from the time t 6, at which the generator output is lower than the power consumption of consumers and the battery power resources are continuously used up, a reliable start of the internal combustion engine 6 is no longer guaranteed in the respective state of charge.
• a certain reserve of the state of charge is taken into account, since a further discharge, in particular by on-board consumers 8, can take place and a cold start must still work. From the time t 6 so the stop release is disabled and the internal combustion engine 3 can not be stopped due to the start-stop operation.

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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)
• Combined Controls Of Internal Combustion Engines (AREA)

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Citations (6)

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• 2009
  • 2009-09-04 DE DE102009029227A patent/DE102009029227A1/de not_active Ceased
• 2010
  • 2010-08-31 CN CN2010800393462A patent/CN102483026A/zh active Pending
  • 2010-08-31 IN IN432DEN2012 patent/IN2012DN00432A/en unknown
  • 2010-08-31 WO PCT/EP2010/062661 patent/WO2011026821A1/de not_active Ceased

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