EP1818536A2 - Procédé et dispositif de surveillance d'au moins une bougie de préchauffage d'un véhicule automobile - Google Patents

Procédé et dispositif de surveillance d'au moins une bougie de préchauffage d'un véhicule automobile Download PDF

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Publication number
EP1818536A2
EP1818536A2 EP07100987A EP07100987A EP1818536A2 EP 1818536 A2 EP1818536 A2 EP 1818536A2 EP 07100987 A EP07100987 A EP 07100987A EP 07100987 A EP07100987 A EP 07100987A EP 1818536 A2 EP1818536 A2 EP 1818536A2
Authority
EP
European Patent Office
Prior art keywords
glow plug
time
threshold value
current
dependent
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP07100987A
Other languages
German (de)
English (en)
Other versions
EP1818536A3 (fr
Inventor
Hans-Peter Bauer
Rainer Moritz
Ulrich Kawa
Frank Lehmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1818536A2 publication Critical patent/EP1818536A2/fr
Publication of EP1818536A3 publication Critical patent/EP1818536A3/fr
Ceased legal-status Critical Current

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Classifications

    • 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
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/027—Safety devices, e.g. for diagnosing the glow plugs or the related circuits
    • 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
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • 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
    • F02D2041/2031—Control of the current by means of delays or monostable multivibrators
    • 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
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • 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
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • F02D2041/2062—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value the current value is determined by simulation or estimation

Definitions

  • the invention relates to a method and a device for monitoring an at least one glow plug of a motor vehicle.
  • glow plugs in motor vehicles are monitored by comparing the current flowing through the glow plugs with a predetermined fixed threshold. If the current consumption through the glow plug is less than the threshold, the glow plug is rated as faulty.
  • Analog circuits use comparators or differential amplifiers for this purpose.
  • Microcomputer-based Glühzeit tenuieri determine via an analog-to-digital converter corresponding to the current through the glow plug digital value and compare this with a stored digital threshold.
  • the problem is that the current profile of the glow plug after application of the supply voltage is highly time-dependent.
  • the monitoring of the glow plug based on a fixed current value therefore only allows a very rough rating.
  • a time-dependent variable which characterizes the current flowing through the at least one glow plug for fault detection is compared with at least one time-dependent threshold value, and is detected for errors when the time-dependent variable is greater and / or less than the threshold value is, can be detected much more safely and effectively for errors. It is particularly advantageous if the time-dependent threshold value is determined by means of a simulation of the glow plug. As a result, the effort in the context of the application of the control unit can be significantly reduced.
  • the time-dependent threshold value or the time-dependent threshold values have the same characteristic time profile as the current of the glow plug to be monitored.
  • a particularly simple and inexpensive replica of the glow plug is a so-called RC circuit.
  • the glow plug is essentially simulated by a capacitor. The charge contained in the capacitor corresponds to the energy content and thus to a first approximation of the temperature of the glow plug.
  • a particularly accurate and precise replica of the glow plug results in replicating a microcomputer circuit is used. In such a microprocessor circuit, a corresponding time characteristic or a programmed function may be included.
  • the comparison between the time-dependent threshold value and the time-dependent variable is carried out by means of an analog comparison circuit. As a result, the circuit complexity and the programming effort in the control unit can be significantly reduced and there is a simple and cost-effective solution available.
  • FIG. 1 shows the essential elements of the device according to the invention.
  • a glow plug 100 is connected in series with a current measuring means 120 and a switching means 110 between the two terminals of a supply voltage.
  • a current measuring means 120 and a switching means 110 is provided for each glow plug.
  • a common switching means 110 and / or a common current measuring means 120 is provided for a plurality of glow plugs or all glow plugs of an internal combustion engine.
  • the illustrated embodiment, in which each glow plug is associated with a current measuring means 120 and a switching means 110 offers the advantage that the glow plugs can be individually controlled and the current flowing through the respective glow plug can be evaluated. If several glow plugs are combined to form a group, or if all the glow plugs are actuated together and / or the current evaluated together, this offers the advantage that more expensive elements, for example the switching means, can be saved, thus resulting in considerable cost savings.
  • a control unit 130 which, in addition to other components not shown, includes an evaluation 133, a control 135 and an error detection 137.
  • the driver 135 controls the switching means 110 to supply a desired energy to the glow plug.
  • the evaluation 133 evaluates the voltage drop across the current measuring means 120 to determine the current flowing through the glow plug.
  • the current measuring means 120 is preferably designed as an ohmic resistor.
  • the voltage drop at the current measuring means 120 is supplied to an amplifier 140 which provides its output signal to the evaluation 133. Furthermore, the output signal of the measuring amplifier 140 reaches a comparator 150, at whose second input the output signal of a threshold value input 160 is present.
  • the glow plugs have a very low resistance at the beginning of the current supply. As a result, a very large current flows at the beginning of the current supply. By heating the glow plug increases their resistance, which in turn causes the current drops.
  • An exemplary course of the current over the time of an annealing process is plotted in FIG. 2 with a solid line. If the current deviates significantly from this curve, then a fault in the range of the control or a defect of the glow plug can be assumed.
  • a lower threshold value IU is specified, below which error is detected.
  • the value of the lower threshold IU assumes, by way of example, the dot-dash line in FIG. If the current falls below this value, then a defect is detected.
  • an upper threshold value 10 is specified, which assumes the profile indicated by a dashed line in FIG. If the current exceeds this value, a defect is assumed as well. It is particularly advantageous if both a lower and an upper threshold value are predetermined and detected for errors when the current is outside the tolerance band defined by the two threshold values.
  • control unit 130 may be omitted and only a measuring amplifier 140 and a comparator 150 and a threshold value 160 may be provided, which evaluates the voltage drop across the measuring resistor 120.
  • a circuit may be constructed in particular analog. D. h only analogous components are provided which take over the functionalities.
  • Threshold value 160 is essentially formed by an RC circuit in this embodiment. This consists of a series circuit of a resistor 201 and a capacitor 205, which is arranged between the ground terminal and the connection point between the current measuring means 120 and the switching means 110. Ie. Essentially, a voltage proportional to the voltage drop across the glow plug 100 is applied to the capacitor 205. Furthermore, there is a series circuit of the resistor 201 and further resistors 202, 203 and 204. This series circuit is arranged between the ground terminal and the connection point between switching means 110 and current measuring means 120 respectively.
  • the input signal to the comparator 150a is tapped.
  • the signal for a second comparator 150b is tapped.
  • the two comparators 150a and 150b correspond to the comparator 1150 shown in FIG. 1.
  • two comparators are provided so that a threshold value query with a lower and an upper threshold value is possible.
  • one of the two comparators and one of the three resistors 202, 203 or 204 can be dispensed with. In this embodiment, only a comparison with a threshold value is then possible. It is essential that the voltage divider and the series circuit of capacitor 205 and resistor 201 are supplied with the same voltage applied to the glow plug to be monitored.
  • the voltage drop corresponding to the current flowing through the glow plug is compared with the voltage drop across the capacitor 205. Whereby not the total voltage but the voltage divided by the voltage divider consisting of the resistors 202, 203 and 204 is evaluated. At the outputs of the comparators 150a and 150b, there is a respective signal which, depending on the comparison, indicates an error or indicates a fault-free operation.
  • the circuit shown in Figure 3 represents a simple replica of the glow plug.
  • the voltage across the capacitor depends on the charge of the capacitor.
  • the capacitor acts integrating and summing up the energy introduced into the glow plug. This is achieved by applying a voltage proportional to the voltage drop across the glow plug to the capacitor 205.
  • the state of charge or the voltage across the capacitor 205 is a measure of the temperature or the resistance of the glow plug.
  • the time behavior of the output voltage of the voltage divider which is formed by the resistors 202, 203 and 204, corresponds to the time behavior of the fault-free current through the glow plug.
  • the lower and / or upper threshold values can be specified.
  • the embodiment shown in FIG. 3 represents an analogous possibility of realization. It is particularly advantageous if the threshold value specification 160 forms part of the control unit 130. In this case, it is possible to realize the threshold value specification digitally. For example, it may be provided that the threshold value is stored as a characteristic curve in a memory of the control unit 130. In each case, a characteristic for the upper and / or lower threshold can be provided. In this case, the comparison is also made in a comparator, which is in the form of a digital circuit or a computer.
  • FIG. 4 shows a further embodiment of the replica of the glow plug according to the invention, from which threshold values for the current, in particular an upper current threshold value IO and a lower current threshold value IU, are formed.
  • the references 135, 110, 120, 100 and 140 again designate the drive 135, the switching means 110, the current measuring means 120 and the amplifier 140, which are already known from FIG.
  • the replica of the glow plug takes place here again by an RC element, which is formed by the resistor 201 and the capacitance 205. In contrast to FIG. 3, however, here the RC element is connected between the drive 135 and a ground connection.
  • the RC element 201, 205 is energized and it forms at the tap between the resistor 201 and the capacitor 205, a voltage which behaves like the voltage at the glow plug 100.
  • the voltage divider 202, 203, 204 then comparison voltages are formed, which are proportional to an upper threshold for the current IO and proportional to a lower current threshold IU.
  • the tapped between the resistors 202 and 203 voltage is proportional to the upper threshold IO.
  • the tapped between the resistors 203 and 204 voltage is proportional to the lower threshold IU.
  • the voltage proportional to the upper threshold value IO is supplied to a comparator 150a whose other input is connected to the output of the amplifier 140. As soon as the voltage drop across the resistor 120, which is evaluated by the comparator 140, exceeds the comparison voltage for the upper current threshold value IO, a corresponding signal is generated by the comparator 150a, which represents an error signal. Accordingly, the comparator 150b generates a signal when the voltage drop across the measuring means 120, which is evaluated by the comparator 140, falls below the comparison voltage for the lower measured current value IU.
  • the threshold values IO and IU are calculated on the basis of different input variables according to a programmed function. For example, provision may be made for the threshold values to be calculated according to a function based on predefined parameters, the time and the supply voltage applied to the glow plug. Such a calculation is preferably carried out by means of a computer.
  • the output signal of the controller 135 is used to calculate the threshold values. This means based on the drive signal of the switching means, which is preferably present as a time-dependent PWM signal, the threshold value is calculated. This can be realized both analogously by means of an RC circuit and also digitally by means of a computer.
  • a corresponding computer may be part of the control unit 130.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
EP07100987.2A 2006-02-08 2007-01-23 Procédé et dispositif de surveillance d'au moins une bougie de préchauffage d'un véhicule automobile Ceased EP1818536A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006005711A DE102006005711A1 (de) 2006-02-08 2006-02-08 Verfahren und Vorrichtung zur Überwachung wenigstens einer Glühkerze eines Kraftfahrzeugs

Publications (2)

Publication Number Publication Date
EP1818536A2 true EP1818536A2 (fr) 2007-08-15
EP1818536A3 EP1818536A3 (fr) 2014-07-02

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EP07100987.2A Ceased EP1818536A3 (fr) 2006-02-08 2007-01-23 Procédé et dispositif de surveillance d'au moins une bougie de préchauffage d'un véhicule automobile

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EP (1) EP1818536A3 (fr)
DE (1) DE102006005711A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009097922A1 (fr) * 2008-02-04 2009-08-13 Robert Bosch Gmbh Procédé pour contrôler au moins une bougie-crayon de préchauffage d'un moteur à combustion interne et dispositif correspondant
CN101619699B (zh) * 2008-06-27 2012-01-11 通用汽车环球科技运作公司 电热塞控制双模式故障诊断
CN102224468B (zh) * 2008-11-21 2014-02-12 西门子公司 求得燃气轮机燃烧器电点火器状态的方法和测量装置及燃气轮机燃烧器的点火装置
EP2290224A3 (fr) * 2009-08-20 2015-10-21 Toyota Jidosha Kabushiki Kaisha Système de détermination de la détérioration d'une bougie de préchauffage
EP2759771A4 (fr) * 2011-09-20 2015-12-30 Bosch Corp Procédé de diagnostic de bougie incandescente et dispositif de diagnostic de bougie incandescente
US9683240B2 (en) 2011-10-31 2017-06-20 Philip Morris Products S.A. Modulating beta-damascenone in plants

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2935196A1 (de) * 1979-08-31 1981-03-19 Robert Bosch Gmbh, 7000 Stuttgart Sicherheitseinrichtung fuer elektrische verbraucher in kraftfahrzeugen
EP1408233A2 (fr) * 2002-10-09 2004-04-14 Beru AG Procédé et dispositif de commande du chauffage des bougies à incandescence d' un moteur Diesel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5918276A (ja) * 1982-07-20 1984-01-30 Hino Motors Ltd エンジンの始動補助装置
DE4328719A1 (de) * 1993-08-26 1995-03-02 Bosch Gmbh Robert Verfahren zur Überwachung wenigstens eines elektrischen Verbrauchers
DE10348391B3 (de) * 2003-10-17 2004-12-23 Beru Ag Verfahren zum Glühen einer Glühkerze für einen Dieselmotor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2935196A1 (de) * 1979-08-31 1981-03-19 Robert Bosch Gmbh, 7000 Stuttgart Sicherheitseinrichtung fuer elektrische verbraucher in kraftfahrzeugen
EP1408233A2 (fr) * 2002-10-09 2004-04-14 Beru AG Procédé et dispositif de commande du chauffage des bougies à incandescence d' un moteur Diesel

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009097922A1 (fr) * 2008-02-04 2009-08-13 Robert Bosch Gmbh Procédé pour contrôler au moins une bougie-crayon de préchauffage d'un moteur à combustion interne et dispositif correspondant
CN101932818A (zh) * 2008-02-04 2010-12-29 罗伯特.博世有限公司 用于监控内燃机的至少一个预热塞的方法和相应的装置
JP2011511205A (ja) * 2008-02-04 2011-04-07 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 内燃機関の少なくとも１つのグロープラグの監視方法及び装置
CN101619699B (zh) * 2008-06-27 2012-01-11 通用汽车环球科技运作公司 电热塞控制双模式故障诊断
CN102224468B (zh) * 2008-11-21 2014-02-12 西门子公司 求得燃气轮机燃烧器电点火器状态的方法和测量装置及燃气轮机燃烧器的点火装置
EP2290224A3 (fr) * 2009-08-20 2015-10-21 Toyota Jidosha Kabushiki Kaisha Système de détermination de la détérioration d'une bougie de préchauffage
EP2759771A4 (fr) * 2011-09-20 2015-12-30 Bosch Corp Procédé de diagnostic de bougie incandescente et dispositif de diagnostic de bougie incandescente
US9453491B2 (en) 2011-09-20 2016-09-27 Bosch Corporation Method of diagnosing glow plug and glow plug drive control device
US9683240B2 (en) 2011-10-31 2017-06-20 Philip Morris Products S.A. Modulating beta-damascenone in plants

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Publication number Publication date
DE102006005711A1 (de) 2007-08-23
EP1818536A3 (fr) 2014-07-02

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