CN109555582A - Storage tank heating device - Google Patents
Storage tank heating device Download PDFInfo
- Publication number
- CN109555582A CN109555582A CN201811115797.4A CN201811115797A CN109555582A CN 109555582 A CN109555582 A CN 109555582A CN 201811115797 A CN201811115797 A CN 201811115797A CN 109555582 A CN109555582 A CN 109555582A
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- Prior art keywords
- resistance
- storage tank
- temperature coefficient
- positive temperature
- heating device
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 55
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 230000005611 electricity Effects 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 7
- 239000004202 carbamide Substances 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 229910002113 barium titanate Inorganic materials 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000003340 mental effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
- F24H9/1827—Positive temperature coefficient [PTC] resistor
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
- G05D23/1931—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of one space
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
- G05D23/303—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature using a sensing element having a resistance varying with temperature, e.g. thermistor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
- F01N2610/105—Control thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- General Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Thermal Sciences (AREA)
- Exhaust Gas After Treatment (AREA)
- Resistance Heating (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The present invention relates to a kind of storage tank heating devices of reducing agent storage tank for SCR system.The storage tank heating device has multiple positive temperature coefficient resistors being electrically connected in parallel.The positive temperature coefficient resistor, in 30.0 DEG C to 70.0 DEG C in the range of the first average temperature (T1) in the case where, the positive temperature coefficient resistor being connected in parallel has the first all-in resistance (R in the range of 1.40 Ω to 1.60 ΩGes_1).
Description
Technical field
The present invention relates to a kind of storage tank heating devices of reducing agent storage tank for SCR system.
Background technique
A kind of method and apparatus for running the internal combustion engine in especially motor vehicle known, in the exhaust zone of the internal combustion engine
Be disposed in domain SCR catalyst (Selective Catalytic REduction, selective catalytic reduction), the SCR catalysis
Device there are reducing agent by include the internal combustion engine exhaust gas in nitrogen oxides be reduced into nitrogen.Thereby, it is possible to
The share of the nitrogen oxides in the exhaust gas is reduced significantly.For the reaction progress in the case where need ammonia, the ammonia
It is blended into exhaust gas.Therefore, the reagent for using ammonia or ammonia to crack as reducing agent.Usually use aqueous urine thus
Plain aqueous solution, the aqueous aqueous solution of urea are injected into exhaust gas system in the upstream of the SCR catalyst.From this solution
It is middle to form the ammonia to work as reducing agent.It can be commercially with titleThe aqueous aqueous solution of urea obtained
One third is by urea and 2/3rds are made of water.It has -11.5 DEG C of freezing point.
In the case where low temperature, it is necessary to the aqueous solution of urea in the reducing agent storage tank of SCR system be made to thaw.For this purpose,
Storage tank heating device can be set, and the storage tank heating device is configured to electric heater unit.It has mental section, two parallel connections
The electrical heating elements and plastics spray to cast covering portion (Kunststoffumspritzung) of ground connection, the plastics spray to cast covering portion
Protect the mental section and the heating element from corrosive effect of aqueous solution of urea.The electricity of the heating element is special
Linearity curve is nonlinear and is so selected, so that resistance rises when the temperature rises using normal operating point as starting point
It is high.Thus heating power declines.In heating state, it should export heating power as much as possible water-soluble to the urea
Liquid.Restrictive factor is maximum allowable electric current and the temperature load for acting on the plastics spray to cast covering portion.
In the case where given voltage, after some time electrical power with by the power output to the thermal energy of environment
It is balanced between power.This balance depends on the design of the mental section and depends on filling out in the reducing agent storage tank
Water-filling is flat and depends on environment temperature.The storage tank heating device must function simultaneously in a variety of different operating statuses
And heating power as much as possible is generated according to fill level and temperature, but the plastics spray to cast cladding must not be damaged herein
Portion.Therefore, the nonlinear resistance characteristic is so selected, so that the heat for acting on the plastics spray to cast covering portion is negative
Lotus is not too high.
Summary of the invention
The storage tank heating device of reducing agent storage tank for SCR system have it is multiple, especially two electrically simultaneously
The positive temperature coefficient resistor of connection ground connection.Also referred to as PTC resistor or PTC- thermistor (PTC=PositiveTemperature COefficient, positive temperature coefficient) positive temperature coefficient resistor be resistance relevant to temperature.They have
Have positive temperature coefficient and at low temperatures can than in the event of high temperatures preferably conduct electric current.In order to be used as storage tank
The heating element of self-regulation in heating device, the positive temperature coefficient resistor are particularly based on ceramic material, such as barium titanate
(BaTiO3).
Being connected in parallel for the positive temperature coefficient resistor is characterized in that such a electrical characteristics curve, in electrical characteristics song
Average temperature in line about the positive temperature coefficient resistor being connected in parallel shows its all-in resistance.The average temperature exists
This is the average value of the single temperature of the positive temperature coefficient resistor.In order to reach maximum heating power in heating state simultaneously
And simultaneously guarantee effect in the thermic load of the plastics spray to cast covering portion be not it is too high, so implement the positive temperature coefficient electricity
Resistance so that the positive temperature coefficient resistor, in 30.0 DEG C to 70.0 DEG C in the range of the first average temperature feelings
Under condition, these positive temperature coefficient resistors have the first all-in resistance in the range of 1.40 Ω to 1.60 Ω.
The typical fortune of storage tank heating device of first all-in resistance within the temperature range of being in -30 DEG C to 128 DEG C
The smallest all-in resistance for the positive temperature coefficient resistor being preferably connected in parallel in line range.Described first average temperature is at this
Also referred to as reference temperature in the case of kind, when the temperature rises the all-in resistance using the reference temperature as starting point and steeply
It increases.This leads to the characteristic of the self-regulation of the storage tank heating device, so that the storage tank heating device exists described in deviation
The raising when deviation of reference temperature by the all-in resistance is conditioned again returns to the reference temperature.It drops temperature to low
In the reference temperature, all-in resistance is also increased.
In order to obtain optimal heating power within the scope of the whole service of the storage tank heating device, resistance characteristic is bent
Line preferably has described representational control point (St ü tzpunkte) below in addition:
The positive temperature coefficient resistor, in 70.5 DEG C to 81.5 DEG C in the range of the second average temperature the case where
Under, the positive temperature coefficient resistor being connected in parallel preferably has second total electricity of the range in 1.40 Ω to 1.60 Ω
Resistance.Because this range is overlapped with the range of first all-in resistance, described second should be noted that as other condition
All-in resistance is more than or equal to first all-in resistance.
The positive temperature coefficient resistor, in 82.0 DEG C to 104.0 DEG C in the range of third average temperature
In the case of, the positive temperature coefficient resistor has the third all-in resistance in the range of 1.48 Ω to 1.82 Ω.Because this
The range of range and second all-in resistance is overlapping, so should pay attention to other condition: that is, the third all-in resistance is greater than institute
State the second all-in resistance.
4th all-in resistance is in the range of 1.97 Ω to 2.35 Ω.The positive temperature coefficient resistor, be in 90.0
DEG C in the case where the 4th average temperature in the range of 110.0 DEG C, there is the 4th all-in resistance.Because of this temperature model
The range for enclosing the temperature average with the third is overlapping, so should be noted that the 4th average temperature as other condition
Degree is greater than the average temperature of the third.
5th all-in resistance of the positive temperature coefficient resistor is in the range of 4.75 Ω to 6.11 Ω.In the positive temperature
In the case where coefficient resistance, the 5th average temperature in the range of 90.0 DEG C to 120.0 DEG C, it is total to occur the described 5th
Resistance.Because this temperature range includes the temperature range of the 4th average temperature completely, as other condition
It should be noted that the 5th average temperature is greater than the 4th average temperature.
6th all-in resistance of the positive temperature coefficient resistor is in the range of 11.10 Ω to 32.10 Ω.In the positive temperature
In the case where spending coefficient resistance, the 6th average temperature in the range of 90.0 DEG C to 128.0 DEG C, occur the described 6th
All-in resistance.Because this temperature range includes the temperature range of the 5th average temperature completely, as other item
Part should be noted that the 6th average temperature is greater than the 5th average temperature.
It is furthermore preferred that a kind of control electronics are provided with, for so controlling the positive temperature coefficient resistor
Energization, thus in the previously given operating status of the storage tank heating device according to characteristic curve relevant to temperature come
Limit the all-in resistance of the positive temperature coefficient resistor.The previously given operating status refers in particular to empty reducing agent storage tank simultaneously
And refer to the environment temperature more than previously given threshold value.Temperature limiting in these operating statuses have the advantage that as
Normal heating state is not present in fruit, then minimizes the thermo-mechanical load for acting on the positive temperature coefficient resistor.
The characteristic curve that the characteristic curve stored in the control electronics preferably rule of thumb obtains, the spy
The actual characteristic that linearity curve depicts positive temperature coefficient resistor deviates the deviation of its theoretic characteristic.
Obtain this characteristic curve particularly by following manner, it may be assumed that by the theoretic numerical value of first all-in resistance with
First all-in resistance, measured in the operation of storage tank heating device numerical value compares.Utilize this herein
A bit: first all-in resistance is as the smallest all-in resistance in the resistance characteristic of the storage tank heating device to the storage
It is especially with representational for case heating device.
Detailed description of the invention
The embodiment of the present invention is shown in the accompanying drawings and is explained in detail in the following description.
Fig. 1 shows the isometric views of the cross-section of storage tank heating device according to an embodiment of the present.
Fig. 2 shows the equivalent circuit diagrams of storage tank heating device according to an embodiment of the present.
Fig. 3 shows the resistance characteristic of storage tank heating device according to an embodiment of the present with curve.
Fig. 4 shows the tolerance of the permission in resistance characteristic of the selection according to Fig. 3 with curve.
Specific embodiment
Fig. 1 shows storage tank heating device 1 according to an embodiment of the present, and the storage tank heating device is arranged in
In the reducing agent storage tank 2 of unshowned SCR catalyst system.The storage tank heating device 1 has aluminium extrusion profiles
(Aluminiumstrangpressprofil) 11 generated heat to be led to aqueous aqueous solution of urea.In extrudate
There are two by barium titanate (BaTiO for arrangement in 113) constitute positive temperature coefficient resistor 12,13.The extrudate 11 and described
Positive temperature coefficient resistor 12,13 is by polyamide 14 come spray to cast cladding.The electronic control of outside in the reducing agent storage tank 2
Equipment 3 is connected by unshowned contact mechanism (Kontaktierung) with the storage tank heating device 1.The electronics control
Control equipment controls the energization of the positive temperature coefficient resistor 12,13.
As shown in Figure 2, two positive temperature coefficient resistors 12,13 are electrically connected in parallel.First
Positive temperature coefficient resistor 12 has first resistor R herein12And the second positive temperature coefficient resistor 13 has second resistance R13.Institute
State the all-in resistance R of two positive temperature coefficient resistors 12,13GesWith the resistance R of following cablesKSeries connection, is given by the cable
The positive temperature coefficient resistor 12,13 is powered.Cable resistance RKIt cannot be ignored, because of the positive temperature coefficient resistor 12,13
It is relatively low impedance.
The positive temperature coefficient resistor 12,13 is so selected, there are six the resistance characteristic at control point songs so that it has band
Line.The resistance characteristic is shown in FIG. 3.These control points meet the requirement according to below table 1:
Table 1
| i | Ti[℃] | ±ΔTi[℃] | RGes_i[Ω] | ±Δ RGes_i[Ω] |
| 1 | 50.0 | 20.0 | 1.50 | 0.10 |
| 2 | 76.0 | 5.5 | 1.50 | 0.10 |
| 3 | 93.0 | 11.0 | 1.65 | 0.17 |
| 4 | 100.0 | 10.0 | 2.16 | 0.19 |
| 5 | 105.0 | 15.0 | 5.43 | 0.68 |
| 6 | 109.0 | 19.0 | 21.60 | 10.50 |
In corresponding temperature TiIn the case where, the average temperature T of the positive temperature coefficient resistor 12,13iThe margin of tolerance
±ΔTiWith with the all-in resistance RGes_iThe margin of tolerance ± Δ RGes_iIt is shown in FIG. 4.The storage tank be can be realized at these
Within the margin of tolerance of the optimal heat characteristic of heating device 1, resistance characteristic has been selected according to below table:
Table 2:
| i | Ti[℃] | RGes_i[Ω] |
| 1 | 60.0 | 1.48 |
| 2 | 75.0 | 1.51 |
| 3 | 86.0 | 1.64 |
| 4 | 99.0 | 2.07 |
| 5 | 116.0 | 6.00 |
| 6 | 120.0 | 16.70 |
In the normal heating state of the storage tank heating device, the storage tank heating device is due to for the positive temperature
It spends the selection of coefficient resistance 12,13 and shows the characteristic according to this resistance characteristic.But, for being heated with normal
Operating condition that situation is not inconsistent, namely in the case where empty reducing agent storage tank 2 or the medium temperature greater than 10 DEG C, in institute
State the limitation being provided in control electronics 3 for heating power.For this purpose, existing for the manipulation of the heating element 12,13
Theoretic resistance characteristic according to fig. 2 is not based in these operating conditions.But using being learnt
(gelernt), the resistance characteristic calculated according to formula 1:
RGes_iThrough learn=F*RGes_i(formula 1)
It is this to learn the factor F by means of calculating according to formula 2 to carry out:
(formula 2)
Here, in addition to the all-in resistance R known from table 2Ges_iExcept, it is contemplated that in the past in temperature T1When measured reality
The smallest all-in resistance R on borderMeasurement, it is minimum.This all-in resistance can be calculated according to formula 3:
(formula 3)
Here, U(T1) indicate in temperature T1When the voltage that loads, Imax(T1) indicate in temperature T1Shi Liudong's is maximum herein
Electric current, and RKIndicate cable resistance.The numerical value U(T can be measured1) and Imax(T1), and the cable voltage RKIt is then
It is known.The resistance characteristic for temperature limiting is obtained by means of the control point so changed, the resistance characteristic is bent
Line is stored in the control electronics 3.It then, can be by it in the operation with positive (aktiv) temperature limiting
For being manipulated to the positive temperature coefficient resistor 12,13 in state.Such as the positive temperature coefficient can be adjusted now
The average temperature of resistance.
Claims (9)
1. for SCR system reducing agent storage tank (2) storage tank heating device (1), the storage tank heating device have it is multiple with
The positive temperature coefficient resistor (12,13) that is connected in parallel of mode of electricity, which is characterized in that the positive temperature coefficient resistor (12,
13), the first average temperature (T in the range of 30.0 DEG C to 70.0 DEG C1) in the case where, it is described to be connected in parallel
Positive temperature coefficient resistor (12,13) has the first all-in resistance (R in the range of 1.40 Ω to 1.60 ΩGes_1).
2. storage tank heating device (1) according to claim 1, which is characterized in that the first all-in resistance (RGes_1) -30
DEG C to the smallest all-in resistance within the temperature range of 128 DEG C being the positive temperature coefficient resistor (12,13) being connected in parallel.
3. storage tank heating device (1) according to claim 1 or 2, which is characterized in that in the positive temperature coefficient resistor
(12,13), the second average temperature (T in the range of 70.5 DEG C to 81.5 DEG C2) in the case where, it is described to connect in parallel
The positive temperature coefficient resistor (12,13) connect has the second all-in resistance (RGes_2), second all-in resistance is in 1.40 Ω to 1.60
In the range of Ω and it is more than or equal to the first all-in resistance (RGes_1).
4. storage tank heating device (1) according to claim 3, which is characterized in that the positive temperature coefficient resistor (12,
13), temperature (T that third in the range of 82.0 DEG C to 104.0 DEG C is average3) in the case where, it is described to be connected in parallel
Positive temperature coefficient resistor (12,13) have third all-in resistance (RGes_3), the third all-in resistance is in 1.48 Ω to 1.82 Ω
In the range of and be greater than the second all-in resistance (RGes_2).
5. storage tank heating device (1) according to claim 4, which is characterized in that the positive temperature coefficient resistor (12,
13), in the range of 90.0 DEG C to 110.0 DEG C and be greater than the average temperature (T of the third3) the 4th average temperature
Spend (T4) in the case where, the positive temperature coefficient resistor (12,13) being connected in parallel has in 1.97 Ω to 2.35 Ω's
The 4th all-in resistance (R in rangeGes_4).
6. storage tank heating device (1) according to claim 5, which is characterized in that the positive temperature coefficient resistor (12,
13), in the range of 90.0 DEG C to 120.0 DEG C and be greater than the described 4th average temperature (T4) the 5th average temperature
Spend (T5) in the case where, the positive temperature coefficient resistor (12,13) being connected in parallel has in 4.75 Ω to 6.11 Ω's
The 5th all-in resistance (R in rangeGes_5).
7. storage tank heating device (1) according to claim 6, which is characterized in that the positive temperature coefficient resistor (12,
13), in the range of 90.0 DEG C to 128.0 DEG C and be greater than the described 5th average temperature (T5) the 6th average temperature
Spend (T6) in the case where, the positive temperature coefficient resistor (12,13) being connected in parallel, which has, is in 11.10 Ω to 32.10 Ω
In the range of the 6th all-in resistance (RGes_6).
8. according to claim 1 should with control electronics (3) to storage tank heating device (1) described in any one of 7
Control electronics are arranged for so controlling the energization of the positive temperature coefficient resistor (12,13), thus in the storage tank
The positive temperature coefficient is limited according to characteristic curve related with temperature in the previously given operating status of heating device (1)
All-in resistance (the R of resistance (12,13)Ges).
9. storage tank heating device (1) according to claim 8, which is characterized in that obtain the spy by following manner
Linearity curve: that is, by the first all-in resistance (RGes_1) theoretic numerical value and the first all-in resistance (RGes_1), institute
Numerical value measured in the operation of storage tank heating device (1) is stated to compare.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017217004.2 | 2017-09-26 | ||
| DE102017217004.2A DE102017217004A1 (en) | 2017-09-26 | 2017-09-26 | tank heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109555582A true CN109555582A (en) | 2019-04-02 |
Family
ID=64024308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811115797.4A Pending CN109555582A (en) | 2017-09-26 | 2018-09-25 | Storage tank heating device |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR20190035533A (en) |
| CN (1) | CN109555582A (en) |
| DE (1) | DE102017217004A1 (en) |
| GB (1) | GB2568587A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114466967A (en) * | 2019-09-23 | 2022-05-10 | 罗伯特·博世有限公司 | Heating device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456186B (en) * | 2019-07-22 | 2021-11-26 | 老肯医疗科技股份有限公司 | Heater attenuation test system and test method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008044271B4 (en) * | 2008-12-02 | 2023-07-06 | Robert Bosch Gmbh | Procedure for checking the function of an electrical heating device |
| ES2655994T3 (en) * | 2010-07-22 | 2018-02-22 | Watlow Electric Manufacturing Company | Combination fluid sensor system |
| CN103635666B (en) * | 2011-07-07 | 2016-03-30 | 贝卡尔特公司 | There is the selective catalytic reduction tank of heating element |
| DE102015201760A1 (en) * | 2015-02-02 | 2016-08-04 | Smk Systeme Metall Kunststoff Gmbh & Co. Kg. | Heater with mounted in a mounting element PTC heating element for a tank, in particular for a urea tank |
| DE102016203496A1 (en) * | 2016-03-03 | 2017-09-07 | Röchling Automotive SE & Co. KG | Electric heater with PTC element and electrical supply lines as Wärmeleitkörper and operating fluid tank with such a heater |
-
2017
- 2017-09-26 DE DE102017217004.2A patent/DE102017217004A1/en not_active Withdrawn
-
2018
- 2018-09-19 KR KR1020180111907A patent/KR20190035533A/en unknown
- 2018-09-24 GB GB1815529.1A patent/GB2568587A/en not_active Withdrawn
- 2018-09-25 CN CN201811115797.4A patent/CN109555582A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114466967A (en) * | 2019-09-23 | 2022-05-10 | 罗伯特·博世有限公司 | Heating device |
| CN114466967B (en) * | 2019-09-23 | 2024-04-09 | 罗伯特·博世有限公司 | Heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20190035533A (en) | 2019-04-03 |
| DE102017217004A1 (en) | 2019-03-28 |
| GB2568587A (en) | 2019-05-22 |
| GB201815529D0 (en) | 2018-11-07 |
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Application publication date: 20190402 |