WO2013119168A1 - Diagnostic de démarreur - Google Patents

Diagnostic de démarreur Download PDF

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Publication number
WO2013119168A1
WO2013119168A1 PCT/SE2013/050046 SE2013050046W WO2013119168A1 WO 2013119168 A1 WO2013119168 A1 WO 2013119168A1 SE 2013050046 W SE2013050046 W SE 2013050046W WO 2013119168 A1 WO2013119168 A1 WO 2013119168A1
Authority
WO
WIPO (PCT)
Prior art keywords
starter motor
temperature
status indicator
measured
rotation speed
Prior art date
Application number
PCT/SE2013/050046
Other languages
English (en)
Inventor
Holger Dreher
Gunnar Ledfelt
Original Assignee
Scania Cv Ab
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 Scania Cv Ab filed Critical Scania Cv Ab
Priority to EP13746140.6A priority Critical patent/EP2812564A4/fr
Publication of WO2013119168A1 publication Critical patent/WO2013119168A1/fr

Links

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
    • F02N11/10—Safety devices
    • F02N11/108—Safety devices for diagnosis of the starter or its components
    • 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
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • 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
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/022—Engine speed
    • 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
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/023—Engine temperature
    • 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
    • F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
    • F02N2200/024—Engine oil temperature
    • 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
    • F02N2200/04—Parameters used for control of starting apparatus said parameters being related to the starter motor
    • F02N2200/043—Starter 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
    • 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
    • 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
    • F02N2200/064—Battery temperature

Definitions

  • the present invention relates generally to diagnosis of an electric starter motor for a combustion engine.
  • the invention relates particularly to a system according to the preamble of claim 1 and a method according to the preamble of claim 1 0. It relates also to a computer programme according to claim 1 9 and a computer- readable medium according to claim 20.
  • all motor vehicles provided with combustion engines depend today on an electric starter motor to enable them to be started.
  • the function of the starter motor is thus vital for the operation of the vehicle.
  • There are various known solutions for verifying this function For practical reasons it is considered preferable if there is no need for the starter motor to be removed from the vehicle for testing of its function.
  • Specifications GB 2 003 281 , J P 55057659, US 2009/0309530 and US 7,409,856 describe examples of solutions for investigating the fu nction of an electric starter motor. All of them i nvolve considering a supply voltage to the starter motor, a rotation speed parameter and the current supplied to the starter motor. However, the measurement of cu rrent is relatively complicated to perform. There is also risk of the actual measurement affecting the starter motor's fu nction.
  • Specification KR 1 0081 9334 describes a method in which the only input parameters for the diag nostic fu nction are the battery voltage for the starter motor and a rotation speed generated by the starter motor.
  • the object of the present invention is therefore to propose a solution which alleviates the above problems and therefore makes possible a more reliable diagnosis of an electric starter motor with which a motor vehicle is provided.
  • One aspect of the invention achieves this object by the system described in the introduction which comprises a temperature measurement means configu red to measu re at least one temperatu re related to the vehicle.
  • the processor is here configu red to determine the status indicator on the further basis of the at least one measu red temperatu re.
  • This system is advantageous in that environment changes (e.g. due to changing seasons and/or geographical conditions) are catered for in the diagnostic method in a natural and appropriate way.
  • the viscosity of the oil in a combustion engine does in fact vary considerably with temperature, with consequent effects upon the rotation speed measured.
  • the processor is configured to assign the status indicator a first value if the starter motor's function is deemed acceptable, and a second value if the starter motor is not deemed to be functioning satisfactorily.
  • the status indicator is assigned the first value if the measured voltage is above a voltage threshold and the measured rotation speed is above a rotation speed threshold.
  • a correctly functioning starter motor is expected to result in at least a certain rotation speed of the combustion engine when the starter motor is provided with a certain supply voltage.
  • the processor is configured to apply in addition an adaptive subcondition on the basis of the at least one measured temperature so that at a relatively high measured temperature a relatively low measured voltage has to be matched by a measured rotation speed to enable the adaptive subcondition to be deemed fulfilled and the status indicator to be consequently assigned the first value.
  • a relatively high measured temperature a relatively high measured supply voltage may be matched by a measured rotation speed which is just above the rotation speed threshold at which the adaptive subcondition is deemed fulfilled and the status indicator is assigned the first value.
  • the effect of temperature on the requirements for the starter motor to function is thus taken relevant account of.
  • the adaptive subcondition is with advantage inversely proportional to the measured temperature.
  • the processor is configured to assign to the status indicator a third value which represents it being impossible to determine the starter motor's function if the measured supply voltage is below the voltage threshold. If the supply voltage is too low, it is in fact not possible to draw any conclusions about whether the engine not starting is due to the starter motor being faulty or whether the fault is due to some other cause, e.g. insufficient battery voltage.
  • the measuring means are configured to measure the technical magnitudes over a measuring period and the processor is configured to average the measured technical magnitudes over that period.
  • the processor is also configured to determine the status indicator on the basis of an average supply voltage to the starter motor over the measuring period and an average engine speed over the same period.
  • the temperature measurement means is also configured to measure the at least one temperature over a measuring period and the processor is configured to average the measured temperature over the same period.
  • the processor is here configured to utilise this averaged temperature in determining the status indicator. Taking average values thus into account is advantageous in that the momentary values for supply voltage, rotation speed and temperature may be temporarily misleading as regards the actual conditions. It may also be advantageous to take into account other parameters, e.g. a lowest measured supply voltage to the starter motor during a compression cycle.
  • a further embodiment of this aspect of the invention considers the possibility that the engine may be of at least two possible different types.
  • the processor is here configured to determine the status indicator on the further basis of the vehicle's engine type.
  • the various engine types are supposed to be associated with different requirements for the starter motor's function and it is therefore possible on the basis of information about the respective engine type for suitable parameters and threshold values to be chosen for diagnosis of the starter motor.
  • Another aspect of the invention achieves the object by the method described in the introduction whereby at least one temperature related to the vehicle is measured and the status indicator is determined on the further basis of the at least one measured temperature.
  • a further aspect of the invention achieves the object by a computer programme directly downloadable to the internal memory of a computer and comprising software for controlling the steps of the method proposed above when said programme is run on a computer.
  • the computer may itself be represented by a control unit on board the vehicle, a diagnostic unit connected thereto, a surfboard, a smartphone etc.
  • Yet another aspect of the invention achieves the object by a computer-readable medium which has stored on it a programme adapted to enabling a computer to control the steps of the method proposed above.
  • Figure 1 is a schematic diagram of a proposed system
  • Figures 2a-b are graphs illustrating how the status indicator may be assigned according to embodiments of the invention
  • Figure 3 is a flowchart illustrating the general method according to the invention.
  • FIG 1 is a schematic diagram of a system according to the invention for diagnosis of an electric starter motor 110.
  • the starter motor is supposed to be part of a vehicle equipped with a combustion engine 120 which the starter motor is configured for starting.
  • the starter motor is itself powered with advantage by a battery 135.
  • the proposed system comprises measuring means 130 and 140, temperature measurement means 150 and a processor 160.
  • the measuring means 130 and 140 are configured to measure technical magnitudes related to the vehicle but representing only a supply voltage U to the starter motor 110 and a rotation speed RPM of the engine 120.
  • the following description discusses throughout this rotation speed RPM.
  • the temperature measu rement means 1 50 is configu red to measure at least one temperature T related to the vehicle.
  • This at least one temperatu re may for example refer to an ambient temperatu re pertaining to the vehicle, an oil temperature in the engine, a cooling water temperature, an engine block temperatu re, a starter motor temperatu re and/or a battery temperatu re. It is advantageous to register more than one temperatu re in that this makes it possible to assess whether the vehicle is started cold (all temperatures substantially equal) , warm (oil temperature in engi ne and cooling water temperature considerably hig her than ambient temperatu re) or in a semi- warm state (cooling water temperatu re considerably hig her than ambient temperatu re but oil temperature in engine relatively low).
  • the processor 1 60 is configu red to use the measu red technical mag nitudes U and RPM and the temperature T as a basis for determining for the starter motor a status indicator S which serves as a measure of the quality of its performance.
  • the measu ring means 1 30 and 1 40 are configured in one embodiment of the invention to measure the tech nical magnitudes over a measu ring period , e.g. 1 second, du ring which for example ten individual measurements are recorded.
  • the measu ring period may be adaptively con nected to one or more compression cycles of the engine so that it represents a whole number of compression cycles.
  • the length of a typical compression cycle is about 1 5 ms.
  • the processor may in such cases be configu red to register a lowest rotation speed du ring a compression cycle. Starting performance has i n fact been fou nd to depend on the rotation speed at its lowest.
  • the processor may fu rther be configu red to average between respective lowest measu red supply voltages U to the starter motor in each of a number of compression cycles.
  • the processor 1 60 may thus be configured to average the measured technical magnitudes over the measuring period and to determine the status indicator S on the basis of an average supply voltage U avg to the starter motor over the period and an average rotation speed R P M avg of the engine over the same period.
  • the temperature measurement means 1 50 is with advantage configured to measure at least one temperatu re T over a measu ring period. If such is the case, the processor is of course configured to average the at least one measured temperatu re T over the measuring period and to use at least one of the at least one averaged temperatu re in determi ning the status indicator S.
  • Figure 2a is a first graph illustrating how the status i ndicator S is assigned accordi ng to one embodiment of the invention. It plots on the horizontal axis an average supply voltage U avg to the engine and on the vertical axis an average rotation speed R P M av g of the engine. I n this embodi ment of the invention the processor is configu red to assign the status indicator S a first value OK if the starter motor's function is deemed acceptable, and a second value NOT if the starter motor is not deemed to be fu nctioning satisfactorily.
  • the status indicator S is assigned the first value OK if the measured supply voltage U avg is above a voltage threshold U th and the measu red rotation speed is at the same time above a rotation speed threshold RPM th . It is advantageous to calculate the status indicator S continuously by comparing a measured rotation speed RPM with an expected rotation speed and to apply minimum threshold levels (e.g. a first level representing acceptable starter motor fu nction OK and a second level corresponding to unacceptable starter motor fu nction NOT), as for example in the relationship
  • minimum threshold levels e.g. a first level representing acceptable starter motor fu nction OK and a second level corresponding to unacceptable starter motor fu nction NOT
  • T a measu red temperatu re e.g. an ambient temperature pertaining to the vehicle
  • N2(T) a rotation speed parameter at the temperatu re T.
  • the status i ndicator S 80 if the starter motor's function is good .
  • S > 70 may thus correspond to acceptable starter motor fu nction OK, but if S ⁇ 70 indicates u nacceptable starter motor function NOT, a change of starter motor is advisable.
  • the processor applies an adaptive subcondition which depends on the at least one measured temperatu re T. This may mean that at a first temperatu re T1 the rotation speed has to exceed the rotation speed threshold RPM th pro rata to how far the supply voltage U avg exceeds a first control voltage U br1 , where U br1 > U th .
  • the adaptive subcondition is with advantage inversely proportional to the at least one measured temperature T.
  • Figu re 2b for a second graph showing how the processor assigns the status indicator S. Like Figure 2a, it plots on the horizontal axis an average supply voltage U avg to the starter motor and on the vertical axis an average rotation speed RPM avg of the engine.
  • a measured temperature T is assumed to have a value T2 > T1 .
  • the adaptive subcondition being inversely proportional to the measu red temperatu re T means that at a hig her temperature T and a given supply voltage U avg a higher rotation speed RPM avg is required to enable the starter motor's fu nction to be deemed acceptable (and the status indicator S to be assigned the first value OK) .
  • the slope of the temperature- dependent adaptive subcondition on the g raph in Figure 2b is therefore steeper than in Figure 2a.
  • a second control voltage U br2 may at a hig her temperature T2 > T1 be also given a lower value, i.e. U br2 ⁇ U br1 , where U br2 > U th .
  • the processor 1 60 is therefore with advantage configured to apply the adaptive subcondition on the basis of the measu red temperatu re T so that at a relatively high measured temperature T2 a relatively low measu red supply voltage U avg has to be matched by a measured rotation speed exceeding the rotation speed threshold RPM th to enable the adaptive subcondition to be deemed fulfilled and the status indicator S to be assigned the fi rst value OK.
  • the processor 1 60 is with advantage configured to assign the status indicator S so that a relatively hig h measured supply voltage U avg may be matched by a measu red rotation speed which is just above the rotation speed th reshold RPM th , in which case the adaptive subcondition is deemed fulfilled and the status indicator S is assigned the first value OK.
  • the processor is therefore configured in such cases to assign the status indicator S a third value UN DEF denoting that the starter motor's function cannot be determined.
  • the vehicle's engine 1 20 may be of at least two possible different types.
  • the respective engine types are themselves supposed to be associated with different requirements for the starter motor's function. Different types of engines typically have different starter motors, with consequent need for parameter adjustment, e.g. adjustment for swept volume and number of cylinders.
  • Information about the respective type of engine may be stored on board the vehicle or be provided interactively via data input by a mechanic.
  • the processor is configured in this embodiment to determine the status indicator S on the further basis of the vehicle's engine type. On the basis of information about the respective engine type, the processor can set adjusted parameters and threshold values in order to diagnose the starter motor in an appropriate way.
  • the processor 1 60 is with advantage caused to function as above by means of a computer programme stored in the memory unit M which is part of, or is communicatively connected to, the processor.
  • a starter motor is supposed activated. This has with advantage been preceded by the fuel injection to the engine being shut off to prevent any risk of its starting during the diagnostic procedure.
  • the starter motor is otherwise deemed to be in a vehicle and to be intended to start a combustion engine with which the vehicle is also provided.
  • a subsequent step 320 registers a first technical magnitude related to the vehicle in the form of a measured rotation speed of the engine. As described above, this rotation speed is registered over a measuring period which may be synchronised with one or more compression cycles.
  • a step 330 parallel with step 320 registers a second technical magnitude related to the vehicle in the form of the supply voltage to the starter motor.
  • a step 340 parallel with steps 320 and 330 registers at least one temperature related to the vehicle, i.e. a non-technical magnitude.
  • a step 350 determines a status indicator for the starter motor on the basis of the measured technical magnitudes and the at least one temperature. The status indicator serves as a measure of the quality of the starter motor's performance, e.g. whether it is functioning satisfactorily or not.
  • the method steps described with reference to Figure 3 may be controlled by means of a programmed computer unit.
  • the embodiments of the invention described above with reference to the drawings comprise a computer and processes conducted in a computer
  • the invention extends to computer programmes, particularly computer programmes on or in a support suited to practical implementation of the invention.
  • the programme may be in the form of source code, object code, a code which is intermediate between source and object code, e.g. in partly compiled form, or in any other form suitable for use in implementing the process according to the invention .
  • the support may be any entity or device capable of carrying the prog ramme. It may for example comprise a storage maxim m such as a flash memory, a ROM (read only memory), e.g .
  • a CD compact disc
  • E PROM electrically prog rammable ROM
  • EE P ROM erasable E PROM
  • a mag netic recordi ng Maxi m e.g. a floppy disc or hard disc.
  • It may also be a transmitting support such as an electrical or optical signal which can be conveyed by an electrical or optical cable or via radio or i n some other way.
  • the program me takes the form of a sig nal which can be conveyed di rectly by a cable or some other device or means
  • the support may take the form of such a cable, device or means.
  • it may be an integ rated circuit in which the prog ramme is embedded , in which case the integrated circuit is adapted to conducting , or being used in the conducting of, the respective processes.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

L'invention concerne un moteur à combustion (120) dans un véhicule, qui est démarré au moyen d'un démarreur électrique (110), diagnostiqué par un moyen de mesure (130, 140), un moyen de mesure de température (150) et un processeur (160). Le moyen de mesure (130, 140) est conçu pour mesurer des magnitudes techniques associées au véhicule mais représentant seulement une tension d'alimentation (U) vers le démarreur et une vitesse de rotation (RPM) du moteur (120). Le moyen de mesure de température (150) est conçu pour mesurer au moins une température (T) associée au véhicule. Le processeur (160) est conçu pour déterminer, pour le démarreur (110), un indicateur de statut (S) qui sert de mesure de la qualité des performances du démarreur. L'indicateur de statut (S) est basé sur les magnitudes techniques mesurées et la au moins une température (T) associée au véhicule.
PCT/SE2013/050046 2012-02-07 2013-01-22 Diagnostic de démarreur WO2013119168A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13746140.6A EP2812564A4 (fr) 2012-02-07 2013-01-22 Diagnostic de démarreur

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1250086A SE536801C2 (sv) 2012-02-07 2012-02-07 Diagnostisering av startmotor
SE1250086-4 2012-02-07

Publications (1)

Publication Number Publication Date
WO2013119168A1 true WO2013119168A1 (fr) 2013-08-15

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PCT/SE2013/050046 WO2013119168A1 (fr) 2012-02-07 2013-01-22 Diagnostic de démarreur

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EP (1) EP2812564A4 (fr)
SE (1) SE536801C2 (fr)
WO (1) WO2013119168A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10094354B2 (en) 2015-06-29 2018-10-09 Cummins, Inc. Diagnostic system, method, and apparatus for a starting system

Citations (6)

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Publication number Priority date Publication date Assignee Title
US4731601A (en) * 1986-12-08 1988-03-15 General Motors Corporation Cranking system performance indicator
US5423302A (en) * 1994-03-23 1995-06-13 Caterpillar Inc. Fuel injection control system having actuating fluid viscosity feedback
US20070227237A1 (en) * 2006-03-30 2007-10-04 Snap-On Incorporated Starting motor tester that measures power
US20090309530A1 (en) * 2008-06-16 2009-12-17 Gm Global Technology Operations, Inc. Method and apparatus for starter motor diagnosis and prognosis using parameter estimation algorithm
DE102008047630A1 (de) * 2008-09-17 2010-03-25 Continental Automotive Gmbh Verfahren und Vorrichtung zur Erkennung einer fehlerhaften Startereinrichtung bei einem Fahrzeug
US20120017618A1 (en) * 2010-07-20 2012-01-26 Thermo King Corporation Engine starter predictive maintenance system

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Publication number Priority date Publication date Assignee Title
JP3589143B2 (ja) * 2000-03-21 2004-11-17 日産自動車株式会社 車両のアイドルストップ・再始動制御装置
DE102006039112A1 (de) * 2006-08-21 2008-02-28 Robert Bosch Gmbh Verfahren zum Ermitteln der Drehzahl eines Starters

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Publication number Priority date Publication date Assignee Title
US4731601A (en) * 1986-12-08 1988-03-15 General Motors Corporation Cranking system performance indicator
US5423302A (en) * 1994-03-23 1995-06-13 Caterpillar Inc. Fuel injection control system having actuating fluid viscosity feedback
US20070227237A1 (en) * 2006-03-30 2007-10-04 Snap-On Incorporated Starting motor tester that measures power
US20090309530A1 (en) * 2008-06-16 2009-12-17 Gm Global Technology Operations, Inc. Method and apparatus for starter motor diagnosis and prognosis using parameter estimation algorithm
DE102008047630A1 (de) * 2008-09-17 2010-03-25 Continental Automotive Gmbh Verfahren und Vorrichtung zur Erkennung einer fehlerhaften Startereinrichtung bei einem Fahrzeug
US20120017618A1 (en) * 2010-07-20 2012-01-26 Thermo King Corporation Engine starter predictive maintenance system

Non-Patent Citations (1)

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Title
See also references of EP2812564A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10094354B2 (en) 2015-06-29 2018-10-09 Cummins, Inc. Diagnostic system, method, and apparatus for a starting system

Also Published As

Publication number Publication date
SE536801C2 (sv) 2014-09-02
EP2812564A1 (fr) 2014-12-17
SE1250086A1 (sv) 2013-08-08
EP2812564A4 (fr) 2017-10-25

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