CN103875308B - Electro-heat equipment - Google Patents

Electro-heat equipment Download PDF

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Publication number
CN103875308B
CN103875308B CN201280049575.1A CN201280049575A CN103875308B CN 103875308 B CN103875308 B CN 103875308B CN 201280049575 A CN201280049575 A CN 201280049575A CN 103875308 B CN103875308 B CN 103875308B
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CN
China
Prior art keywords
heater
resistance
value
resistance value
energising
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Expired - Fee Related
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CN201280049575.1A
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Chinese (zh)
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CN103875308A (en
Inventor
入江将嗣
深泽剛
山口宏尚
林真人
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Denso Corp
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Denso Corp
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0236—Industrial applications for vehicles
    • 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
    • F02P19/021—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 characterised by power delivery controls
    • 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
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • 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
    • F02P19/021—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 characterised by power delivery controls
    • F02P19/022—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 characterised by power delivery controls using intermittent current supply
    • 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
    • F02P19/021—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 characterised by power delivery controls
    • F02P19/023—Individual control of the glow plugs
    • 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
    • F02P19/025—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 with means for determining glow plug temperature or glow plug resistance
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/02—Heaters using heating elements having a positive temperature coefficient
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/027—Heaters specially adapted for glow plug igniters

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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 Resistance Heating (AREA)

Abstract

The invention provides a kind of electro-heat equipment, be installed to each cylinder of engine.Electro-heat equipment has heater, channel electric controlled molding group and holds the housing shell of these parts.Described module has reference resistor value memory cell and resistance change reflection unit.Described memory cell is by the target temperature T of electro-heat equipment in regulation tRGunder resistance value as reference resistor value R cstore.Described reflection unit allows during being energized to heater as its plug resistance value R gPlower than reference resistor value R cin time, is energized to heater, and as resistance value R during being energized to heater gPexceed reference resistor value R cin time, stops being energized, the resistance change of the variations in temperature along with heater to be reflected in energising control.

Description

Electro-heat equipment
Technical field
The present invention relates to the electro-heat equipment with heater and channel electric controlled molding group, realize stable energising control and deteriorated abnormality detection fast by simply forming, be particularly suitable for the heater plug (glowplug) of each cylinder using being arranged at diesel combustion mechanism as heater, and the one-piece type heater plug of control part heater and channel electric controlled molding group are contained in integratedly in the housing of roughly tubular, above-mentioned heater generates heat by being energized, and its resistance value changes according to the heating temp of self with possessing positive correlation, above-mentioned channel electric controlled molding group controls from power supply to the energising of this heater.
Background technology
In the past; as the abnormal detector of detection to the broken string exception of the heater plug that the igniting of diesel combustion mechanism is assisted or overcurrent abnormality etc.; known following device: the current detecting unit of current sensor and shunt resistance etc. is set between heater plug and the switch element controlling to the energising of heater plug; according to the electric current flowed in heater plug and the resistance value calculating heater plug to the voltage that heater plug applies, thus detect the deterioration of heater plug and break abnormal.
Patent Document 1 discloses following heater plug deterioration judging device, this heater plug deterioration judging device possesses: detecting unit, by the energising to the heater plug by internal combustion engine preheating, detects the detected value corresponding to the resistance of described heater plug; And identifying unit, after described internal combustion engine operation has just stopped, being energized to described heater plug, based on the described detected value detected by described detecting unit, the deterioration of described heater plug having been judged.
Patent Document 2 discloses following heater deterioration detecting apparatus, this heater deterioration detecting apparatus possesses: the first voltage output unit, is that voltage exports the first magnitude of voltage by the current transformation flowed in heater; Second voltage output unit, is connected with power supply, exports second magnitude of voltage corresponding with the voltage of described power supply; And compare judgement unit, by comparing the first magnitude of voltage and the second magnitude of voltage that export respectively from described first voltage output unit and described second voltage output unit, differentiate that described heater is with or without deterioration.
Patent Document 3 discloses the power control apparatus of following heater, for the heater with heating resistor, the energising for described heating resistor is controlled by resistance value control mode, described heating resistor generates heat by being energized, and according to self variations in temperature and the resistance value of self change with possessing positive correlation, described resistance value control mode refers to, to make the resistance value of the described heating resistor mode consistent with target resistance values to the mode controlled that is energized, the feature of the power control apparatus of this heater is, possess: the 1st acquisition unit, when the driving of the internal combustion engine being provided with described heater stops, the 1st resistance value of described heating resistor is obtained to described heating resistor energising, environmental information acquisition unit, when obtaining described 1st resistance value, obtains the information of the ambient temperature corresponding to the environment that described heater uses, computing unit, based on the information of described 1st resistance value and described ambient temperature, calculates described target resistance values, and energising control unit, when the driving of described internal combustion engine, in the mode consistent with the described target resistance values calculated by described computing unit, control the energising to described heating resistor.
At first technical literature
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2009-36092 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2009-191842 publication
Patent documentation 3: Japanese Unexamined Patent Publication 2010-127487 publication
The summary of invention
Invent problem to be solved
In patent documentation 1,2 such deterioration judging devices in the past, as the current detecting unit for detecting the electric current flowed in heater plug and the benchmark providing the threshold value for judging deterioration, use shunt resistance etc.
In addition, inevitably there is individual difference in the resistance value of heater plug.Therefore, use the shunt resistance with certain resistance value to detect fire plug (plug) electric current flowed in heater plug, and compare according to this fire plug electric current with to the resistance value that the potentiometer that heater plug applies calculates with the reference resistance with certain resistance value, thus when threshold determination is carried out to deterioration state, ignore the individual difference of the resistance value of heater plug.
Such as, when the high heater plug of initial resistance, when along with use, resistance value rises a little, under the state that can arrive target temperature, in fact and not completely deteriorated even if, when the resistance value detected exceedes certain threshold value, also possible errors deterioration is judged to be, in contrast, when the low heater plug of initial resistivity value, even if be deteriorated to the degree that cannot arrive target temperature, because initial resistance is originally lower, even if resistance value rises along with use, when not exceeding certain threshold value, be also judged to be to possible errors normal.
In addition, in heater plug power control apparatus in the past, the energising of the multiple heater plugs to each cylinder being arranged at internal combustion engine is controlled by a power control apparatus.In such formation, because the resistance value of each heater plug exists individual difference, in order to avoid excessive temperature rise, in specified with the heater plug of lowest resistance value for benchmark, determine the average voltage V being controlled supply by PWM aVG, and supply is by V aVG 2/ R gPthe power determined.
Therefore, in multiple heater plug, namely allow to the excessive temperature rise of the heater plug avoiding resistance value low, also may cause the arrival temperature of the heater plug that resistance value is high and the decline of programming rate.
In addition, in the heater plug power control apparatus that patent documentation 3 is such, make use of the environmental informations such as engine water temperature, so control method is complicated, need the CPU and interrupt timer etc. of high calculation processing power, circuit scale becomes large, cannot the maximization of avoiding device, may be difficult to carry in the engine room being highly integrated with various electronic-controlled installation.
In addition, in heater plug power control apparatus in the past, in order to more precisely control the heating temp of heater plug or detect the exception of heater plug, carry out A/D conversion to the fire plug electric current flowed in heater plug with to the fire plug voltage that heater plug applies and send to ECU side, calculation process is carried out and for the stopping of heater plug power control apparatus or temperature adjustmemt in ECU side, the data volume of the transmission between heater plug power control apparatus and ECU becomes huge, so need high performance CPU, or need the data communication units of the high speeds such as CAN, the increase of manufacturing cost cannot be avoided.
In addition, when applying certain target power by the mode that patent documentation 3 is such, be subject to the impact of eddy current, there is the large problem that actual heating temp drops to below target temperature.
Summary of the invention
At this, the present invention in view of the foregoing, its object is to, there is provided a kind of control part one-piece type electro-heat equipment, structure is extremely simple and lift-launch property is excellent, and when using multiple heater at the same time, can carry out according to the individual difference of each heater inevitably existed the presence or absence judging deterioration accurately respectively, and independently and accurately temperature control is carried out to each heater.
Solve the means that problem adopts
In the invention of technical scheme 1, a kind of electro-heat equipment, possessing: heater, generating heat by being energized, and its resistance value changes according to the variations in temperature of self with possessing positive correlation; And channel electric controlled molding group, control from power supply to the energising of above-mentioned heater to make the resistance value of this heater consistent with target resistance values; This above-mentioned heater and above-mentioned channel electric controlled molding group are contained in housing integratedly, and above-mentioned channel electric controlled molding group possesses: reference resistor value memory cell, store the resistance value of the above-mentioned heater under the target temperature of the regulation measured in advance, as reference resistor value; And resistance change reflection unit, using said reference resistance value as threshold value, the resistance value of above-mentioned heater when energized maintains energising lower than during said reference resistance value, stop energising when the resistance value of above-mentioned heater exceedes said reference resistance value, and the resistance change of the variations in temperature along with above-mentioned heater is reflected in energising control.
In the invention of technical scheme 2, a kind of electro-heat equipment, possessing: heater, generating heat by being energized, and its resistance value changes according to the variations in temperature of self with possessing positive correlation; And channel electric controlled molding group, control from power supply to the energising of above-mentioned heater to make the resistance value of this heater consistent with target resistance values; This above-mentioned heater and above-mentioned control module are contained in housing integratedly, and above-mentioned channel electric controlled molding group possesses: reference resistor value memory cell, store the resistance value of the above-mentioned heater under the target temperature of the regulation measured in advance, as reference resistor value; Resistance change reflection unit, using said reference resistance value as threshold value, the resistance value of above-mentioned heater when energized maintains energising lower than during said reference resistance value, stop energising when the resistance value of above-mentioned heater exceedes said reference resistance value, and the resistance change of the variations in temperature along with above-mentioned heater is reflected in energising control; And deterioration judging unit, performance number during deterioration is carried out deterioration judging as threshold value, and during this deterioration, performance number the initial gain value that the above-mentioned heater under the steady state to the set point of temperature measured in advance applies is multiplied by the ratio of regulation and calculates and be envisioned for the value being applied to above-mentioned heater under the deteriorated limiting temperature of regulation.
In the invention of technical scheme 3, said reference resistance value is set to repair by electricity the resistance adjusted.
In the invention of technical scheme 4, above-mentioned electricity finishing is carried out by Zener breakdown or based on the digital trim of polysilicon fuse.
In the invention of technical scheme 5, above-mentioned heater is the heater plug of each cylinder being arranged at internal combustion engine.
In the invention of technical scheme 6, some before the startup of internal combustion engine, after just the stopping of internal combustion engine or when idling is stopped of above-mentioned deterioration judging carries out.
The effect of invention
According to the invention of technical scheme 1, heater and channel electric controlled molding consist of one, even if produce individual difference in the resistance value of fabrication stage heater, also can according to this individual difference by each electro-heat equipment setting said reference resistance value, by above-mentioned resistance change reflect unit the resistance change along with variations in temperature is reflected to energising control time, can not be driven by the state of other electro-heat equipments, high-precision temperature control can be carried out independently.
In addition, utilize engine water temperature etc. from the information of outside unlike the past, but certainly can carry out temperature control with finishing, so structure can be made very to simplify, the reduction of manufacturing cost can be realized, and lift-launch property is superior.
According to the invention of technical scheme 2, except the effect same with the invention of technical scheme 1, by said temperature change reflection unit with under making the resistance value of the heater mode consistent with said reference resistance value realize temperature controlled situation, when due to long-term use, the resistance value of heater rises, even if actual power diminishes and the heating temp step-down of reality, also above-mentioned deterioration judging unit can be had to be judged to be deterioration when heating temp may become below spendable limiting temperature below performance number when actual power value becomes above-mentioned deterioration, do not need to utilize external environmental information etc. as in the past, a large amount of information is exchanged between arithmetic processing apparatus in outside etc., or carry out deterioration judging by the arithmetic processing apparatus of outside, can be formed by simple, from detect deterioration presence or absence with finishing, promptly process deterioration is abnormal.
According to the invention of technical scheme 3, a part for the element forming channel electric controlled molding group can be utilized to form the reference resistor value of expectation, the volume of above-mentioned channel electric controlled molding group can not become large, temperature control can be carried out accurately, achieve and can judge the one-piece type electro-heat equipment of control part with presence or absence of deterioration exception by simply forming.
According to the invention of technical scheme 4, by digital trim, can said reference resistance value that easily and accurately adjustment is corresponding to the individual difference of above-mentioned heater.
According to the invention of technical scheme 5, even if there is individual difference between multiple heater plug, also can not influence each other, can independently and precision ground carry out temperature control, and promptly can judge the presence or absence of deterioration, so the one-piece type heater plug of the high control part of reliability can be realized by open-and-shut formation.
According to the invention of technical scheme 6, the impact of the operating condition of internal combustion engine can not be subject to, the deterioration judging of heater plug can be carried out accurately.
Accompanying drawing explanation
Fig. 1 (a) is the pie graph of the summary of the electro-heat equipment represented in embodiments of the present invention, and (b) is the pie graph of the overall summary of the one-piece type heater plug of control part of the energising representing the multiple heater plugs separately controlled to each cylinder being arranged at internal combustion engine.
Fig. 2 represents the structure of the one-piece type heater plug of control part shown in Fig. 1, a () is the longitudinal section of the structure of the one-piece type heater plug of control part shown in Fig. 1, b () is the cross-sectional view along A-A in this figure (a), c () represents that heater plug of the present invention uses, the longitudinal section of the summary of so-called metal heater as applying, (d) represents that heater plug of the present invention uses, the longitudinal section of the summary of so-called ceramic heater as applying.
Fig. 3 represents that the temperature of the heater plug that the present invention applies fills in the performance plot of the correlation of resistance value with fire, R iNTrepresent the resistance-temperature characteristic (initial condition resistance-temperature characteristic) under initial condition, R aCTrepresent the resistance-temperature characteristic under the state after certain hour use, R wRNrepresent the resistance-temperature characteristic of deterioration state.
Fig. 4 is the flow chart representing the initial method for controlling temperature rise that electro-heat equipment of the present invention uses.
Fig. 5 is the flow chart representing the constant control method that electro-heat equipment of the present invention uses.
Fig. 6 is the time diagram of the electro-heat equipment that the present invention applies, a () is the time diagram of the drive singal in the electro-heat equipment representing that the present invention applies, b () is the time diagram of the change representing fire plug resistance, c () is the time diagram of the result of determination representing variations in temperature reflection unit, d () is the time diagram of the operating state of the semiconductor shutter member represented when having fed back variations in temperature, e () is the time diagram of the change representing electrical current, (f) is the time diagram of the change representing heating temp.
Fig. 7 is under the constant control pattern of the electro-heat equipment applied in the present invention, according to the time diagram of time series arrangement from initial condition to deterioration state, a () is the time diagram representing drive singal, b () is the time diagram of the change representing fire plug resistance, c () is the time diagram of the result of determination representing variations in temperature reflection unit, d () is the time diagram of the operating state of the semiconductor shutter member represented when reflecting variations in temperature, e () is the time diagram of the change representing electrical current, f () is the time diagram of the change representing average power, g () is the time diagram of the change representing heating temp.
Fig. 8 is the flow chart representing in electro-heat equipment of the present invention the rear method for controlling heat used.
Fig. 9 represents effect of the present invention, a () is the performance plot of the temperature control status represented under the constant control pattern in electro-heat equipment of the present invention, b () is the performance plot of the temperature control status represented under the warm-up control pattern in electro-heat equipment of the present invention, (c) is the performance plot of the temperature control status represented under the rear heating control model in electro-heat equipment of the present invention.
Figure 10 is the flow chart for determining whether to carry out deterioration judging in electro-heat equipment of the present invention.
Embodiment
As the electro-heat equipment in embodiments of the present invention, the heater 10 illustrating to be arranged at each cylinder omitting illustrated internal combustion engine is heater, will controls the one-piece type heater plug 1 of control part be contained in integratedly from power supply 6 to the channel electric controlled molding group 20 of the energising of heater 10 in housing 30.
As shown in Figure 1, in the one-piece type heater plug 1 of the control part of present embodiment, possessing: heater 10, generating heat by being energized, and its resistance value changes according to the variations in temperature of self with possessing positive correlation; Channel electric controlled molding group 20, to make this resistance value R gPwith target resistance values R tRGconsistent mode, controls the energising from power supply 6 to heater 10; Reference resistor value memory cell 231, is contained in the housing 30 of roughly tubular integratedly by heater 10, and stores the target temperature T of the regulation measured in advance by channel electric controlled molding group 20 tRGunder the resistance value of heater 10, as reference resistor value R c; And resistance change reflection unit 233, by reference resistor value R cas threshold value, the resistance value R of heater 10 when energized gPlower than reference resistor value R ctime maintain energising, when exceeding reference resistor value R cin time, stops being energized, and the resistance change of the variations in temperature along with heater 10 being reflected in energising control.
In addition, channel electric controlled molding group 20 possesses deterioration judging unit 234, and this deterioration judging unit 234 is by performance number P during deterioration wRNas power threshold P rEFcarry out deterioration judging, performance number P during this deterioration wRNby at the temperature of the regulation measured in advance with the initial gain value P that steady state applies to heater iNTbe multiplied by the ratio of regulation and calculate, and being envisioned for the deteriorated limiting temperature T in regulation wRNunder be applied to heater 10.
Deterioration judging unit 234 in present embodiment is provided with self-diagnosis unit switches, is carrying out FEEDBACK CONTROL to make the resistance value R of heater 10 gPwith reference resistor value R cwhen consistent, relative to becoming target temperature T tRGthe target power P of benchmark tRG, in the fire plug electric current I according to actual flow in heater 10 gPand to the fire plug voltage V that heater 10 applies gPvalue calculate actual power value P aCTfor regulation deteriorated time performance number P wRNwhen following, self-diagnosis unit switches is judged to be deterioration, and output from diagnostic signal DI.
As concrete deteriorated time performance number P wRN, the target temperature T that will realize when manufacturing can be used tRGrequired initial gain value P iNTbe multiplied by certain proportion (such as 90%) and the value obtained.
With reference to Fig. 1, as the electro-heat equipment in embodiments of the present invention, the one-piece type heater plug 1 of control part is described, the one-piece type heater plug 1 of this control part is by heater 10 (1 ~ n)with channel electric controlled molding group 20 (1 ~ n)be contained in housing section 30 integratedly (1 ~ n)in and form, via being contained in connector portion 40 (1 ~ n)interior bonder terminal (41,42,43) is connected with ECU7, above-mentioned heater 10 (1 ~ n)being arranged at each cylinder omitting illustrated internal combustion engine 8, generating heat by being energized, above-mentioned channel electric controlled molding group 20 (1 ~ n)exported for determining the target temperature T corresponding to the operational situation of internal combustion engine 8 by from engine control system (ECU) 7 tRGdrive singal SI, synchronous with drive singal SI, by benchmark resistance R cwith the actual fire plug resistance R detected gP, control from power supply 6 to heater 10 (1 ~ n)energising.
Energising control part module 20 (1 ~ n)be contained in moulded package bag 200 to major general's semiconductor shutter member 21, drive circuit portion 22, heater control IC23, draw each terminal of power input terminal 201, driving signal input 202, self diagnosis signal output terminal 203, lead-out terminal 204, earth terminal 205.
In the present embodiment, semiconductor shutter member 21 uses N channel power MOS FET(hereinafter appropriately referred to as MOS21).
MOS21 has for carrying out multiple control MOS210(of open and close controlling hereinafter referred to as main MOS210 to the big current of flowing in heater 10), using a part wherein as being used for detecting the current detecting MOS211(of the electric current flowed in heater 10 hereinafter referred to as sensing MOS211) use, form current mirroring circuit by main MOS210 and sensing MOS211, be connected with sensing MOS211 and be formed with current detecting resistance 212.
Current detecting resistance 212 is connected with the heater control IC23 possessed as the deterioration judging unit 234 of major part of the present invention via sense terminal SEN.
In the present embodiment, drive circuit portion (DRV) 22 possesses the boosting units such as such as charge pump, such as, and in order to determine for generating heat to the target temperature T corresponding with the operational situation of internal combustion engine 8 tRGduty ratio T oN/ T and the trailing edge of drive singal SI that exports from ECU7 is synchronous, exports the driving voltage V boosting to regulation in order to driven MOS 21 gGvoltage.
In addition, in time diagram described later, as shown in Figure 6, Figure 7, show synchronous with the trailing edge of drive singal SI and start the example that is energized, but in the present invention, for which side driven MOS 21 of Hi, the Lo at drive singal SI, can suitably change.
Charge pump is such as made up of operational amplifier 220, charging capacitor 222, output capacitor 224, diode 221,223, by the switching manipulation of operational amplifier 220, repeats supply voltage V bto the charging and discharging of charging capacitor 222, the energy accumulated by overlapping output capacitor 224 is also discharged, as driving voltage V gGto energising control semiconductor element 21 grid-source electrode between apply to have boosted to supply voltage V bthe grid voltage V of 2 times of voltages etc. gG.
In addition, in fig. l (a), as boosting unit, show by operational amplifier 220, diode 221,223, the charge pump that forms of capacitor 222,224, but do not limit boosting mode in the present invention, also can use the DC-DC converter of so-called chopper-type choking-winding, capacitor, diode are formed by combining, or comprise the DC-DC converter etc. of flyback type of step-up transformer etc.
By resistance value arithmetic element 230, reference resistor value storage part (reference resistance forming portion) 231, reference resistance adjustment unit (Zener breakdown circuit) 232, resistance change, heater control IC23 as major part of the present invention reflects that unit (F/B unit) 233, initial power reference resistance, initial power reference resistance adjustment unit (Zener breakdown circuit) and deterioration judging unit 234 are formed.Resistance value arithmetic element 230 is according to the fire plug electric current I detected by above-mentioned current detecting resistance 212 gPwith the fire plug voltage V applied from semiconductor shutter member 21 to heater 10 gP(equal the source voltage V of semiconductor shutter member 21 sS), calculate the fire plug resistance value R of heater 10 gP.
In addition, in the present embodiment, show by sensing MOS211 detection for calculating resistance value R gPelectric current I gPexample, but not current limit detection method in the present invention.
Such as, under the state of MOS21 cut-off, by detecting the fire plug voltage V occurred when heater control IC23 side direction heater 10 applies constant current with the lower value of several 10mA ~ number 100mA gP, can with the resistance value R of more high precision test heater 10 gP.
The fire plug resistance value R of heater 10 gPdetermined by the intrinsic resistance-temperature characteristic of heater 10, fill in resistance R at the heating temp of heater 10 with fire gPbetween there is certain correlation.
At this, when the manufacture of the one-piece type heater plug 1 of control part, namely heater 10 is connected with energising control part module 20 after, be energized to heater 10, be warmed up to the target temperature (T of regulation by the tester measurement of outside 1) time resistance value, and it can be used as reference resistor value R by the signal from outside cbe stored into reference resistor value storage part (reference resistance forming portion) 231(hereinafter referred to as MEM231).
In addition, when the manufacture of heater 10, also by the monomer connecting the heater 10 that module 20 connects not being measured resistance value, and this value can be stored into the MEM231 controlling module 20.
Resistance change reflection unit (F/B unit) 233 compares the reference resistor value R stored in MEM231 cthe fire plug resistance R detected during heater 10 is used with reality gP, and by its result feedback to drive circuit portion 22.
Based on the reference resistor value R corresponding to each resistance-temperature characteristic c, to maintain reference resistor value R cmode semiconductor shutter member 21 is carried out opening and closing, carry out energising to the heating temp of heater 10 thus to control, so carry out being energized compared with situation about controlling with under unified condition to multiple heater plug, can with the heating temp of higher precision controlling for expecting.
But, if heater 10 Long-Time Service, spread in insulator or the phenomenon such as migration of conductive component movement between heater and insulator by the metal that uses of generating electrodes, or the contact resistance increase due to the stripping/oxidation etc. of electrode, thus fieryly to fill in resistance R gPrise.
At this, when heating temp is from target temperature T tRG(such as 1250 DEG C) drop to have dropped certain value Δ T(such as 100 DEG C) more than deteriorated limiting temperature T wRNtime (such as 1150 DEG C), be judged to be deterioration.
But, in the one-piece type heater plug 1 of control part of the present invention, not measure actual heating temp, but to make fire plug resistance value R gPwith reference resistor value R cconsistent mode is carried out energising and is controlled, thus carries out temperature control, so cannot be detected with or without deterioration by the heating temp of the heater 10 of reality.
In addition, current value I gPchange, so carry out deterioration judging by average current cannot guarantee precision because of cell voltage (supply voltage)+B.
At this, for make fire plug resistance R gPwith reference resistor value R cconsistent mode carries out controlling, to become target temperature T tRGtime actual power P aCTchange, such as by electricity finishing by initial target temperature T tRGunder initial baseline performance number P iNTas initial power reference resistor value R pINTstore, more than certain from the change of this value, become the power threshold P of regulation rEFtime following, be judged as deterioration.
The invention is characterized in, be not the resistance value R calculating heater 10 as in the past gPand carry out threshold determination to it and carry out deterioration judging, but to make the resistance value R of heater 10 gPwith certain reference resistor value R cconsistent mode is carried out energising and is controlled, and thus, wants heating temp to be maintained a timing, along with the deterioration of heater 10, for the resistance value R of set point of temperature gPrise and actual power P aCTdeclining, carrying out degradation by detecting this situation.
In order to store the initial baseline performance number P becoming the benchmark of deterioration judging at this moment iNT, by using the memory elements such as the resistance that can repair or memory, can to advance accurately deterioration judging according to individual difference.
Specifically, by initial power reference resistor value R pINTbe set to and reference resistance adjustment unit 232 can be used by electricity to be repaired the resistance adjusted.
More particularly, as electricity finishing, undertaken by the digital trim based on Zener breakdown or polycrystalline silicone tube.
In addition, memory also can be used to provide reference resistor value R c.But it should be noted, need microcomputer in this case, circuit scale significantly increases.
The constructivity feature of the one-piece type heater plug 1 of control part in the execution mode of electro-heat equipment of the present invention is described with reference to Fig. 2.
The one-piece type heater plug 1 of control part is by the housing 30 being formed as roughly tubular, the heater 10 being located at its front, the channel electric controlled molding group 20 be contained in housing, realizes the structure assembled integratedly with the connector portion 40 of connection of outside.
In the present invention, heater 10 can use the so-called metal heater 10 shown in Fig. 2 (c), also can use the so-called ceramic heater 10a shown in Fig. 2 (d).
The heat coil 102 be made up of metallic resistance line coil and control coil 104 are connected in series by metal heater 10 inner side of the metal protecting tube 103 of bottom tube-like that roughly has that front is closed at base end side opening; hold the insulating material 100 such as magnesium powder simultaneously; be electrically connected with metal protecting tube 103 at the grounding parts 101 of the front being located at heat coil 102, be connected with the input terminal 106 realized with the conducting of channel electric controlled molding group 20 at the base end side of control coil 104.In heat coil 102 and control coil 103, such as, use the known resistance materials such as Fe-Cr-Al alloy, Fe-Cr alloy, Ni-Cr alloy and be formed as the relative resistance that specifies.
Ceramic heater 10a is by the ceramic electrical resistance body 102a being formed as roughly U-shaped, realize the pair of lead wires portion 103a of ceramic electrical resistance body 102a and outside conducting, 104a, cover above-mentioned parts and the insulator 100a being formed as roughly column is formed, the one end of the leading part 103a be connected with an end of ceramic electrical resistance body 102a is drawn to the side surface direction of insulator 100a and forms earth terminal 101a, the front end of the leading part 104a be connected with another end of ceramic electrical resistance body 102a is drawn to the base end part of insulator 100a and forms input terminal 105a, input terminal 105a realizes the conducting with channel electric controlled molding group 20 via input terminal gold utensil 106a.
Ceramic electrical resistance body 102a such as uses the conductive ceramic material be made up of the mixed sintering body of silicon nitride, tungsten carbide.
In addition, leading part 103a, 104a uses the thermal endurance metal materials such as tungsten.
Insulator 100a uses the insulating ceramics materials such as silicon nitride.
Metal heater 10 or ceramic heater 10a are kept by the heater maintaining part material of roughly tubular and are fixed.
Heater maintaining part material is such as by SUS(StainlesssteelinJapaneseIndustrialStandards) etc. metal material form; be formed as roughly tubular; within it keep and fixing metal heater 10 or ceramic heater 10a; and be electrically connected with metal protecting tube 103 or earth terminal 101a, one end of heater 10 becomes the state being grounding to engine via housing 30.
When metal heater 10, protection metal pipe 103 and heater maintaining part material by laser welding, soldering, the known method such as to screw togather and interfix.
When ceramic heater 10a, insulator 100a and heater maintaining part material are fixed by known methods such as chimeric and solderings.
Housing 30 is made up of the housing base 300 being formed as roughly tubular.
Be formed with the front cylindrical portion for keeping heater maintaining part material in the front of housing 30, the cardinal extremity side neck top of heater maintaining part material is inserted embedding and is fixed by welding etc.
The screw division 303 of the combustion chamber being fixed to mechanism for being spirally connected is formed in the periphery of housing 30.
Be fixed with connector portion 40 at the base end part of housing 30, this connector portion 40 holds channel electric controlled molding group 20 in inner side, and realizes connection externally.
The hexagonal portion 304 for the screw division 303 that is spirally connected is formed in the base end side periphery of housing 30.
Connector portion 40 is covered by the collar of roughly tubular and is fixed on the base end side of housing 30.
Connector portion 40 is formed as the resin formation part of roughly tubular by using thermoplastic resin etc. and fixingly within it forms with the bonder terminal 41,42,43 of the connection of outside for realizing.Be formed with fitting portion 401 at the base end side in connector portion 40, this fitting portion 401 is formed as roughly tubular, and realizes chimeric with the other side's side-connector of outside connection.Be formed with terminal fixing part in the midfield in connector portion 40, in this terminal fixing part, be insert molded the bonder terminal 41,42,43 realized with outside connection.In addition, realizing with the bonder terminal 41,42,43 of outside connection is power supply input terminal 41, drive singal input terminal 42, self diagnosis signal output terminal 43 respectively, but can increase and decrease the number of bonder terminal as required.
Such as, can arrange Zener breakdown bonder terminal, this Zener breakdown bonder terminal is used for realizing repairing to reference resistor value R by Zener breakdown cwhen carrying out resistance value adjustment, Zener breakdown input terminal T zP1, T zP2with the connection of outside.
In addition, in order to reduce terminal number, these Zener breakdown bonder terminals can be common with drive singal input terminal 42, self diagnosis signal output terminal 43 or power supply input terminal 41.
Be formed with the front partition wall portion dividing and control module spatial accommodation in the front in connector portion 40, this control module spatial accommodation is for holding channel electric controlled molding group 20.
As shown in Figure 2 (a) shows, power supply input terminal 41, drive singal input terminal 42, self diagnosis signal output terminal 43 are connected with the power input terminal 201 of channel electric controlled molding group 20, driving signal input 202, self diagnosis signal output terminal 203 respectively.
In addition, the lead-out terminal 204(source terminal V of channel electric controlled molding group 20 sS) be connected with heater 10,10a via energising axis 240, GND terminal 205 is connected with housing 30 via earthy line end 250, and becomes the state being grounding to engine via housing 30.
In the present embodiment, MOS21, DRV22, JDG23 etc. of the channel electric controlled molding group 20 consisted of by circuit shown in Fig. 1 epoxy resin etc. are contained in resin formation part 200 integratedly, lead frame is drawn in outside to packaging part, forms power input terminal 41(BAT), drive singal input uses terminal 42(SI), self diagnosis signal output terminal 43(DI), lead-out terminal 204(V sS), earth terminal 205(GND).
In addition, in FIG, channel electric controlled molding group 20 is represented with the packaging part of so-called DIP type (DualInlinePackage type), but in the present invention, do not limit the packaging part structure of channel electric controlled molding group 20, suitably can adopt the structure that other known IC packaging parts of so-called SIP type (SingleInlinePackage type) use.
In addition, specifically, in order to be installed in heater plug housing 30, preferred so-called TO-220 type packaging part, namely from can together the small-sized discrete semiconductor component packaging part of installation power MOSFET and control IC, the thin resin-molded packaging part of such as 10mm × 17mm × 4.5mm degree one-sided, draw the tactic terminal according to input terminal, ground wire, lead-out terminal.
At this, the temperature characterisitic of the heater 10 used in the one-piece type heater plug 1 of control part of the present invention is described with reference to Fig. 3.
This figure represents the relation of the resistance value of heter temperature under steady state and heater, this steady state refers to, to heater applying power to a certain degree, through certain hour post-heater temperature and the saturated state of resistance value, represent the initial condition resistance-temperature characteristic R confirmed in the fabrication stage with single dotted broken line iNT, the resistance-temperature characteristic R after certain hour represented by dashed line uses aCT, resistance-temperature characteristic R during deteriorated under the deterioration state after Long-Time Service indicated by the solid line wRN.
As shown in this figure, under initial condition and deterioration state, the slope of resistance-temperature characteristic does not change, and the resistance value for same temperature moves in parallel in the mode uprised.
Therefore, by for the target temperature T under initial condition tRGresistance value be set to reference resistor value R ctime, if want to maintain reference resistor value R cand carrying out energising control, then heating temp declines, and will drop to tolerable limit temperature T wRNcondition adjudgement be deterioration state, need to implement the process such as abnormality warnings.
With reference to Fig. 4, Fig. 5, conduction control method and the deterioration judging method of the one-piece type heater plug 1 of control part of the present invention are described.
Fig. 4 represents initial heating mode (M iNT) under flow chart.
After being connected by key switch SW, start the initial heating mode (M of step S100 iNT), in the drive singal input validation stroke of step S110, if the input of the drive singal SI exported from ECU30 detected, then enter the heater energising stroke of step S120, start the energising to heater 10.
Then, detect in stroke in the current/voltage of step S130, detect the fire plug electric current I of flowing in heater 10 gP, fire plug voltage V gP.
Then, calculate in stroke, according to fire plug electric current I in the fire plug resistance value of step S140 gPwith fire plug voltage V gPcalculate fire plug resistance value R gP.
Then, be switched and determined in stroke in the pattern of step S150, more fiery plug resistance value R gPwith the reference resistor value R for the target temperature under initial condition c, determine whether to reach reference resistance R c, namely the heating temp of heater 10 whether reach target temperature.
Fire plug resistance value R gPfor reference resistor value R cwhen following, be judged to be "No", get back to step S110 and maintain initial heating mode (M iNT).
Fire plug resistance value R gPbe greater than reference resistor value R cwhen, be judged to be "Yes", terminate initial heating mode (M iNT), enter the constant control pattern of step S200.
In addition, in the heater energising stroke of step S120, in order to prevent intensification, the warm-up control pattern (M of S121, S122, S123 can also be implemented pRE).
Specifically, will than reference resistor value R cslightly low resistance value (preheating target temperature, such as suitable with 1000 DEG C value) is set to warm-up control pattern and switches reference resistor value R cH, be switched and determined in stroke in the warm-up control pattern of step S121, more fiery plug resistance R gPreference resistor value R is switched with warm-up control pattern cH, fire plug resistance R gPfor warm-up control pattern switches reference resistor value R cHwhen following, be judged to be "No", in order to make heater 10 be warmed up to preheating target temperature as early as possible, the initial heating mode entering step S123 maintains stroke, and the duty ratio with roughly 100% is applied above specified power.
Be switched and determined in stroke in the warm-up control pattern of step S121, fire plug resistance R gPexceed warm-up control pattern and switch reference resistor value R cHwhen, be judged to be "Yes", enter the warm-up control pattern (M of step S122 pRE), warm-up control pattern is switched reference resistor value R cHas threshold value, controlled by break-make, such as, within the time of about 1 second, carry out warm-up control pattern (M pRE) control, to become the steady temperature lower than target temperature.
Specifically, such as, by the flow implementation process according to step S1221 ~ step S1225, warm-up control pattern M can be implemented pRE.
Judge in stroke in then (timeup) of step S1221, determine whether to have passed through certain hour t from warm-up control pattern ref.
If certain hour is through front (t < t ref), be then judged to be "Yes", no judgement stroke is wanted in the energising entering step S1222, passes through R gPwith R cHcomparison, determine whether to need energising.
In step S1222, if R gP> R cH, be then judged to be "Yes", enter step S1223, energising is turned off, if R gP≤ R cH, be then judged to be "No", enter step S1224, energising is open-minded.And then the resistance value entering step S1225 calculates stroke, again calculates R gP, get back to step S1221 and repetitive cycling.
From warm-up control pattern through certain hour through later, terminate preheating mode, transfer to main program.
In the warm-up control pattern (M of step S122 pRE) in, by remaining on target temperature, the temperature certain hour of such as lower than 1250 DEG C about 250 DEG C, after can suppressing to constant control pattern (M cST) temperature-rise period (migration model M tRN) in cross heat up.
In addition, at initial heating mode (M iNT) under, fire plug resistance value R gPalong with temperature rises and moment change, so do not carry out deterioration judging.
In addition, warm-up control pattern (M pRE) be not a temperature, such as the 1st preheating target temperature can be set to 1000 DEG C, the 2nd preheating target temperature is set to 1100 DEG C, like this this multiple warm-up control pattern.
In this case, the 1st preheating target temperature and the 2nd preheating target temperature can be switched by the duty ratio changing drive singal SI, but during the formation of sampling such, need to send fire plug resistance R to ECU7 side gPinformation, amount of information increase, produce problem same.
At this, in the present invention, in order to when so multiple warm-up control pattern is set also can process independently in control module 20, the preparation 1st preheating reference resistance corresponding to each target temperature and the 2nd preheating reference resistance in control module 20.
In the pre-heating mode, be that the situation of is same, by more fiery plug resistance R with preheating target temperature gPwith these reference resistor value, determine whether to be energized in the same manner as above-mentioned steps S121 or step S150, if to make fire plug resistance R gPthe mode consistent with each reference resistor value makes MOS21 opening and closing and carries out energising and control, then can not rely on ECU7 side process and in control module 20 side from processing with finishing.
And then, in the present invention, although do not need when power supply can guarantee abundant capacity, at the same time to multiple heater 10 (1 ~ n)when starting to be energized, large inrush current is overlapping and the burden of power supply 6 becomes large, and programming rate is slack-off sometimes.
At this, as electro-heat equipment of the present invention, be arranged at the one-piece type heater plug 1 of control part of each cylinder (1 ~ n)possess independently channel electric controlled molding group 20 and each heater plug 1 respectively (1 ~ n)heater 10 (1 ~ n)when carrying out energising control independently, self cylinder location identifying unit that the cylinder location detecting self is preferably set and the driving delay cell offsetted according to the timing that cylinder location makes energising start.
Fig. 5 represents the flow chart under constant control pattern.
Under the constant control pattern of step S200, carry out energising according to drive singal SI and control, and carry out the reference resistor value R with each heater 10 ccorresponding energising controls, and can judge deterioration state and warn exception.
After starting the constant control pattern of step S200, in the drive singal input validation stroke of step S210, detect the input of drive singal SI, enter the heater energising stroke of step S220, carry out the energising to heater 10.
Detect in stroke in the current/voltage of step S220, detect the fire plug electric current I of flowing in heater 10 gP, fire plug voltage V gP.
Then, calculate in stroke, according to fire plug electric current I in the actual power fire plug resistance value of step S230 gPwith fire plug voltage V gP, calculate actual power value P aCTand fire plug resistance value R gP.
Then, in the deteriorated stroke of step 240, by comparing actual power value P aCTwith power threshold P rEF, threshold determination is carried out to the presence or absence of deterioration.
In addition, power threshold P rEFuse relative to the initial baseline performance number P under initial condition iNTdrop to certain above, such as 90% deteriorated time performance number P wRN.
In the deterioration judging stroke of step S240, actual power value P aCTspecific power threshold value P rEFwhen high, be judged to be not completely deteriorated and be judged to be "Yes", entering resistance change reflection unit (F/B stroke) of step S250.
In the deterioration judging stroke of step S240, actual power value P aCTspecific power threshold value P rEF(initial baseline performance number P is such as become when low iNTless than 90% when), be judged to be deterioration and be judged to be "No", entering the abnormal diagnosis signals delivery stroke of step S260.
In resistance change reflection unit (F/B stroke) of step S250, in order to feed back the change of fire plug resistance value, more fiery plug resistance value R gPwith reference resistor value R c, at fire plug resistance value R gPexceed reference resistor value R cwhen, be judged to be "Yes", the energising entering step 270 stops stroke, at fire plug resistance value R gPfor reference resistor value R cwhen following, be judged to be "No", the energising entering step 280 maintains stroke.
Stop in stroke in the energising of step S270, the heating temp of heater 10 reaches desired value and stops energising, gets back to step S210.
Maintain in stroke in the energising of step S280, the heating temp miss the mark value of heater 10 and maintain energising.
By repeating step S210 ~ step S280, energising being controlled, maintains and each heater plug 1( 1~ n) other reference resistor value R cclose fire plug resistance value rGP.
In the abnormal diagnosis signals delivery stroke of step S260, export the self diagnosis signal DI representing that deterioration is abnormal, such as emergency warning lamp is lighted and urge replacing to notify to runner deterioration abnormal, or stop the energising etc. to heater 10, process as required.
At this, with reference to Fig. 6, the work as the one-piece type heater plug 1 of control part of the electro-heat equipment of embodiments of the present invention is described.In addition, in detail in this figure, the control result of the situation not implementing preheating mode is shown.
Drive singal SI determines for determining the target temperature T corresponding to operational situation tRGduty ratio The determine, and as described above, according to being reflected that by resistance change no result of determination is wanted in the energising that unit 233 detects, synchronously switch the opening and closing of MOS21 with rising edge or trailing edge.
As shown in Figure 6 (a), after have input drive singal SI from ECU7, synchronous with the trailing edge of drive singal SI, as shown in Figure 6 (b), start the energising to heater 10, heating temp rises.
As described above, when fire plug resistance is more than Rc, the result of determination of step S250 is "Yes", at this moment, as shown in Figure 6 (c), resistance change is reflected the output of unit 233 is set to 0, does not carry out the energising to heater 10.
But, not cut off the energising to heater 10 immediately, but before 1 pulse protocol energising terminates, be energized with the duty ratio (such as 90% duty ratio) according to SI, at the rising edge of next drive singal SI, open MOS21 and cut off the energising to heater 10, fire plug resistance decline and after becoming below Rc, the result of determination of step S250 is "No", in order to restart the energising to heater 10, resistance change is reflected the output of unit 233 is set to 1, synchronous with the trailing edge of next drive singal SI, close MOS21 and the energising carried out to heater 10.
Like this, in the present invention, as shown in Figure 6 (b), by reference resistance R cbe used as to switch to the stopping of the energising of heater 10 and the benchmark of execution, but when reality is by MOS21 opening and closing, when the result of determination (JDG) shown in Fig. 6 (c) is for off state, if the rising edge of drive singal SI, then synchronously MOS21 cut-off therewith, during result of determination (JDG) on-state, if the trailing edge of drive singal SI, then synchronously MOS21 conducting therewith.
Therefore, as shown in Fig. 6 (d), owing to synchronously carrying out with the rising edge or trailing edge of drive singal SI, so variations in temperature is at this moment as shown in this Fig. 6 (e), from fire plug resistance R gPchange a little lingeringly follow, but by control module 20 from finish to make fire fill in resistance R gPwith reference resistance R cconsistent mode carries out F/B control, can, as in the past, not utilize engine water temperature or other temperature informations also can make temperature and the target temperature T of heater 10 tRGunanimously.
At this, with reference to Fig. 7, the deterioration judging direction used in electro-heat equipment of the present invention is described.
The time diagram of temporally series arrangement under Fig. 7 represents the constant control pattern of the electro-heat equipment applied in the present invention, from initial condition to deterioration state.
As shown in Figure 7 (a), even if be in the deterioration state of heater 10, also export and target temperature T from ECU7 tRGthe drive singal SI correspondingly set.
As shown in Figure 3, heater 10 is deterioration gradually due to Long-Time Service, for the resistance value R of certain heating temp gPrise gradually.
If the resistance value R of heater 10 along with the carrying out of deterioration gPrise, then, as shown in Fig. 7 (b), Fig. 7 (c), synchronously start to be energized with the trailing edge of drive singal SI, then exceed reference resistance R ctiming become early gradually, in addition, when be energized with certain duty ratio, during a cycle, the maximum of the resistance value RGP of rising also uprises.
Therefore, under deterioration state, fire plug resistance R gPhigher than reference resistance R ctime elongated, as shown in Fig. 7 (d), MOS21 cut-off number of times become many.
Therefore, as shown in Fig. 7 (e), fire plug electric current I gPstep-down, as shown in Fig. 7 (f), actual power P aCTalso decline gradually.
At this moment, actual power P aCTrelative to measure in advance, for the initial baseline performance number P of the set point of temperature under initial condition iNTpower threshold P is become more than change is certain rEFwhen following, be judged to be deterioration.
As shown in Fig. 7 (e), in an initial condition, heating temp T maintains target temperature T tRG, along with the carrying out of deterioration, heating temp T decline more than Δ T, becomes deteriorated limiting temperature T finally wRNbelow, the diagnostic signal DI representing that deterioration is abnormal is exported as described above.
During fabrication, the reference resistor value R of each heater 10 cand initial baseline performance number P iNTbe stored in MEM232, and carry out energising based on these data and control and deteriorated abnormality juding, so the deterioration state impact of other heater plugs can not be subject to, can correctly holding temperature, abnormal in warning deterioration in suitable period.
With reference to Fig. 8, the conduction control method under rear heating control model is described.
In the above-described embodiment, igniting in order to combustion motor carry out auxiliary and carry out to the one-piece type heater plug of control part 1 energising, namely carry out so-called pre-heating (pre-glow) control time, deterioration judging is carried out under constant control pattern, but under preventing catching fire or the alleviate rear heating control model for the purpose of radiation, the deterioration judging of the one-piece type heater plug of control part of the present invention also can be carried out.
In this case, deterioration judging can be carried out according to the flow process substantially same with constant control pattern, but in the deterioration judging stroke of step S340, as with fire plug electric current I gPcompare the threshold value of contrast, electric current I during use the 2nd deterioration wRN2, in resistance change reflection unit (F/B stroke) of step S350, and according to fire plug resistance value R gPwith reference resistor value R cthe 2nd reference resistor value R calculated c2compare and carry out threshold determination.
In rear heating control model, target temperature is lower than constant control pattern, so therewith pro rata, and performance number P during the 2nd deterioration wRN2and the 2nd reference resistor value R c2also low value is used.
In deterioration judging device in the past, the deterioration judging of heater plug carries out within the extremely limited time after just having stopped that being energized, but in the one-piece type heater plug 1 of control part of the present invention, all the time implement during constant control pattern and rear heating control model, promptly can detect extremely deteriorated and tackle.
Fig. 9 (a) is the performance plot of the temperature control status of the situation representing the warm-up control pattern not implementing the one-piece type heater plug 1 of control part of the present invention, Fig. 9 (b) is the performance plot of the temperature control status representing the situation implementing warm-up control pattern, and Fig. 9 (c) is the performance plot of the temperature control status represented in rear heating control model.
As shown in Fig. 9 (a), at initial heating mode (M iNT) under, promptly realize heating up by roughly 100% duty ratio or overpower supply, and then than the 1st target temperature T 1low pattern switching temperature T cHunder, control to be switched to intensification inhibitory control from early warming, so inhibit crossing of heater plug to heat up, after arriving the 1st target temperature, under constant control pattern, by the reference resistance R corresponding to the resistance-temperature characteristic of each heater plug cas threshold value, the energising carrying out feeding back to drive singal controls, so correctly holding temperature, all the time deterioration judging is implemented in during constant control pattern, deterioration can be detected as early as possible abnormal, under rear heating control model, also temperature correctly can be maintained the 2nd target temperature, and in rear heating control period, carry out deteriorated abnormality juding all the time, thus the abnormal detection of deterioration can be carried out as early as possible.
In addition, as described above, warm-up control pattern M is implemented pREwhen, as shown in Figure 9 (b), by remaining on the temperature certain hour lower than target temperature, reliably prevented intensification, then through migration model M tRN, transfer to constant control pattern M cST, maintain target temperature.In addition, in this case, deterioration judging is at warm-up control pattern M pREand constant control pattern M cSTany one temperature stabilization state under implement.
With reference to Figure 10, the period and decision method thereof of carrying out desired by degradation are described.
In the above-described embodiment, show and control side by side to carry out the method for deterioration judging with energising under constant control pattern and rear heating control model, but in the present embodiment, as in order to get rid of external disturbance that operational situation causes, precision detects deterioration judging method with presence or absence of deterioration higher, illustrate before activation or the method for some enforcement deterioration judgings after just the stopping of internal combustion engine or when idling is stopped.
Such as, when starting, flow into large inrush current to starter, and along with the variation of cell voltage.Therefore, the electric current I of flowing in heater 10 gPchange significantly because of the variation of cell voltage+B, so be difficult to detect fire plug resistance R accurately gP.In addition, when engine running etc., may, along with the variation of cell voltage, also be difficult to detect fire plug resistance R accurately gP.
Therefore, to be preferably before the startup of internal combustion engine 8 or after just the stopping of internal combustion engine or when idling is stopped some carries out for deterioration judging of the present invention.
As shown in Figure 10, confirm in stroke in the operational situation of step S400, such as read the information that engine speed NE etc. represents operational situation, could judge in stroke in the deterioration judging of step S410, based on the information of the expression operational situation read in step S400, what determine whether before starting or after just the stopping of internal combustion engine or when idling is stopped is some.
When being some before starting or after just the stopping of internal combustion engine or when idling is stopped, be judged to be "Yes", enter the deterioration judging stroke of step S430, when not being any one before starting or after just the stopping of internal combustion engine or when idling is stopped, be judged to be "No", do not carry out deterioration judging and get back to step S400.
In the deterioration judging stroke of step S430, same with above-mentioned execution mode, according to the fire plug electric current I of flowing in heater 10 gPwith the fire plug voltage V applied to heater 10 gP, calculate actual power value P aCT, and by itself and the power threshold P specified rEFcompare judgement.
In addition, also can be, above-mentioned deterioration judging be implemented all the time in heater plug side, judges the operating condition of engine and optionally use in ECU side.
In addition, in the present embodiment, show and N channel power MOS FET is configured in the upstream side of load, carried out the example of driven for opening and closing by high-side driver, but in the present invention, semiconductor shutter member 21 is not limited to N channel power MOS FET, and P channel power MOS FET also can be configured to be arranged on high side.
In general, known P channel power MOS FET is larger than the conducting resistance of N-channel MOS FET, but does not need the grid voltage boosting units such as charge pump in drive circuit 22.
In addition, also N channel power MOS FET can be arranged on the downstream of load, carry out driven for opening and closing by low side driver.In this case, exist and also execute alive problem beyond heater plug is in action, but do not need to arrange the boosting units such as charge pump in drive circuit portion 22, can circuit be simplified.
The explanation of symbol:
The one-piece type heater plug of 1 control part (electro-heat equipment)
10 heater plugs (heater)
20 channel electric controlled molding groups
200 moulded package bags
201 power input terminals
202 driving signal input
203 self diagnosis signal output terminals
204 lead-out terminals
205 earth terminals
21 semiconductor shutter member
210 control MOS
211 current detecting MOS(Electronic Speculum circuit part)
212 current detecting are with resistance (Zener breakdown resistance)
22 drive circuit portions (DRV)
220 operational amplifiers
221,223 diodes
222,224 capacitors
23 heater control IC
230 resistance value arithmetic elements (current/voltage test section)
231 reference resistor value storage parts (reference resistance forming portion)
232 reference resistance adjustment units (Zener breakdown circuit)
233 resistance change reflection unit (F/B unit)
234 deterioration judging unit
30 housing section
40 connector portions
41 power supply input terminals
42 drive singal input terminals
43 self diagnosis signal output terminals
6 power supplys
7 engine control systems (ECU)
8 internal combustion engines
SI drive singal
P aCTactual power
P iNTinitial baseline performance number
P rEF(during deterioration) power threshold
P wRNperformance number during deterioration
R creference resistor value
R cHwarm-up control pattern switches reference resistor value
T zP1, T zP2 Zener breakdown input terminals
M iNTinitial heating mode
M pREwarm-up control pattern
M tRNmigration model
M cSTconstant control pattern

Claims (5)

1. an electro-heat equipment (1), there is heater (10) and channel electric controlled molding group (20), this heater (10) generates heat by being energized, and its resistance value changes according to the variations in temperature of self with possessing positive correlation, this channel electric controlled molding group (20) controls from power supply to the energising of above-mentioned heater (10) to make the resistance value of this heater (10) consistent with target resistance values, the feature of this electro-heat equipment (1) is
Above-mentioned heater (10) and above-mentioned channel electric controlled molding group (20) are contained in housing (30) integratedly,
Further, above-mentioned channel electric controlled molding group (20) possesses:
Reference resistor value memory cell (231), stores the resistance value of the above-mentioned heater under the target temperature of the regulation measured in advance as reference resistor value;
Resistance change reflection unit (233), using said reference resistance value as threshold value, the resistance value of above-mentioned heater (10) when energized maintains energising lower than during said reference resistance value, stop energising when the resistance value of above-mentioned heater (10) exceedes said reference resistance value, the resistance change of the variations in temperature along with above-mentioned heater (10) is reflected in energising control; And
Deterioration judging unit (234), at the actual power value P of above-mentioned energising aCTfor power threshold P rEFwhen following, judge that above-mentioned heater (10) is as deterioration, this power threshold P rEFthe initial baseline performance number P will applied to the above-mentioned heater (10) under the set point of temperature measured in advance iNTthe value that the ratio being multiplied by regulation calculates.
2. electro-heat equipment as claimed in claim 1, is characterized in that,
Said reference resistance value is set to repair by electricity the resistance adjusted.
3. electro-heat equipment as claimed in claim 2, is characterized in that,
Above-mentioned electricity finishing is carried out by Zener breakdown or based on the digital trim of polysilicon fuse.
4. the electro-heat equipment as described in any one of claims 1 to 3, is characterized in that,
Above-mentioned heater (10) is the heater plug of each cylinder being arranged at internal combustion engine (8).
5. electro-heat equipment as claimed in claim 1, is characterized in that,
The some execution above-mentioned deterioration judging of above-mentioned deterioration judging unit (234) before the startup of internal combustion engine (8), after just the stopping of internal combustion engine (8) or when idling is stopped.
CN201280049575.1A 2011-10-11 2012-08-24 Electro-heat equipment Expired - Fee Related CN103875308B (en)

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PCT/JP2012/071378 WO2013054598A1 (en) 2011-10-11 2012-08-24 Heating device

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