CN206683718U - A kind of electrical heating type urea liquid level sensor - Google Patents
A kind of electrical heating type urea liquid level sensor Download PDFInfo
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- CN206683718U CN206683718U CN201720228975.9U CN201720228975U CN206683718U CN 206683718 U CN206683718 U CN 206683718U CN 201720228975 U CN201720228975 U CN 201720228975U CN 206683718 U CN206683718 U CN 206683718U
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- heating
- urea
- temperature sensor
- heating tube
- liquid level
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Abstract
The utility model discloses a kind of electrical heating type urea liquid level sensor, including base, heating tube, urea temperature sensor, processor, heating tube, temperature sensor, processor are installed on base, and processor is connected with Engine ECU communication, and current measurement module is set in controller；Heating tube includes heating pipe shell, internal layer PTC heating plates and outer layer PTC heating plates are installed in heating pipe shell, internal layer PTC heating plates heating power is less than outer layer PTC heating plate heating powers, is provided with heating temperature sensor in heating tube bottom, passage is provided with heating tube top.The utility model cancels traditional water mode of heating, is changed to Electric heating, and processor analysis heating tube heating power simultaneously combines the temperature data of heating tube temperature sensor and urea temperature sensor, can accurately draw urea level signal.
Description
Technical field
A kind of electrical heating type urea liquid level sensor is the utility model is related to, field is post-processed applied to diesel engine vent gas.
Background technology
With the implementation of the Abgasgesetz of commercial car state IV, vehicle must install nitrogen oxides (NOx) exhaust aftertreatment devices additional.
Chinese medium and heavy-duty engines generally use SCR (SCR) technology path, i.e., by standard urea for vehicle
The aqueous solution is ejected into exhaust, uses ammonia (NH caused by its decomposition3) SCR is carried out to NOx, generation is harmless
Nitrogen (N2) and water (H2O)。
Urea injection system needs urea box and urea liquid level sensor, and urea liquid level sensor function is not only used for surveying
Urea level is taken, while goes back integrated heating structure and is used for the urea solution that thaws in the winter time, integrated urea temperature sensor is used to measure
Urea solution temperature.
Patent document 1 (CN203858011U) discloses a kind of hot end heating-type thermocouple liquid level sensor, including heating
Silk, differential thermocouple and insulating materials and armor sleeve, a node of differential thermocouple are located at the centre position of heater strip, separately
One node is away from heater strip a certain distance, and heater strip, differential thermocouple and insulating materials armouring are in armor sleeve, armouring set
The surface of pipe fire end sets groove, and splash guard is set outside armor sleeve fire end.The utility model has the advantage of：With knot
Structure is simple and reliable, inertia is small, is swift in response, and strong antijamming capability, can be worked stably in a long term in adverse circumstances, can be extensive
Occasion for high reliability requests such as nuclear fields.
Patent document 2 (CN202033072U) discloses a kind of liquid level sensor of band PTC calandrias, include fixed seat,
Electronic control panel, for stretching into the PTC calandrias heated in carrier fluid case to its liquid, for stretching into the suction in carrier fluid casing
Liquid pipe and electron tube, wherein, liquid outlet is provided with the fixed seat, the liquid outlet communicates with foregoing pipette, the Electronic Control
Plate is installed in fixed seat, and the PTC calandrias are connected on electronic control panel by wire.Thereby, by the way that PTC calandrias are answered
On liquid level sensor by formed a kind of Novel heating function and in a manner of liquid level sensor, the PTC calandria fit applications
In in the pipette of liquid level sensor or outside it, the PTC calandrias have heating power is big, the thermal efficiency is high, energy saving, from
Dynamic constant temperature, it is hardly damaged, the advantages that service life is long, safe and reliable, and, the positioning method of the PTC calandrias is simple
It is and firm.
Patent document 3 (CN204388979U) discloses a kind of electric heating magnetic float level meter, including outer tube and
The inner sleeve being placed in outer tube, the upper and lower ends of inner sleeve connect with fluid reservoir respectively, the axis and inner sleeve of the outer tube
The diameter parallel of pipe, multiple protection pipes are installed on the excircle of the inner sleeve, the top of outer tube is provided with and protection pipe
The through hole to match, heater strip are placed in protection pipe through through hole.The utility model is by using bilayer sleeve and plug-in type electricity
Mode of heating heats to testing liquid, and the diameter parallel of the axis of outer tube and inner sleeve so that outer tube it is interior
The outer wall of wall and inner sleeve abuts, and improves the magnetic induction efficiency between float and turned column to ensure the accuracy of detection data.
For patent document 1, each liquid level position is required for a thermocouple, thus cost is high, precision is low.
Patent document 2 and patent document 3 are coordinated using special float and magnetic switch is used as liquid level sensor, heats
Structure separates with liquid level structure, and cost is high, precision is low, complicated.
The content of the invention
The utility model provides a kind of electrical heating type urea liquid level sensor, compared to the magnetic switch formula generally used at present
Liquid level sensor, have the advantages that cost is low, simple in construction, the continuous liquid level signal of output.
The purpose of this utility model is realized by following scheme：
A kind of electrical heating type urea liquid level sensor, including base, heating tube, urea temperature sensor, processor, heating
Pipe, temperature sensor, processor are installed on base, and processor connects with Engine ECU communication；Heating tube includes heating tube
Shell, heat in pipe shell and internal layer PTC heating plates and outer layer PTC heating plates are installed, heating-up temperature is provided with heating tube bottom
Sensor, passage is provided with heating tube top.
Further, the internal layer PTC heating plates heating power is less than outer layer PTC heating plate heating powers.
Further, current measurement module is set in the controller.
Further, processor analysis heating tube heating power and combination heating tube temperature sensor and urea temperature biography
The temperature data of sensor, it can accurately draw urea level signal：
When vehicle needs to measure urea level signal, processor control internal layer PTC heating plate work；Internal layer PTC is heated
In atmosphere, urea is immersed in bottom on piece top；
If urea level is L1, PTC heating plate overall length L, supply voltage U, worked as according to resistance per unit length data
The upper part resistance per unit length of preceding internal layer PTC heating plates is ρ1, internal layer PTC can be obtained according to heating tube temperature sensor signal and added
The lower part resistance per unit length of backing is ρ2, with reference to the electric current I of current internal layer PTC heating plates1, then current urea level：
L1=U/ (ρ2-ρ1)/I1-Lρ1/(ρ2-ρ1)。
The utility model has advantages below：
The engine cooling water heat protocol being commonly used is not used, electrical heating scheme is changed to, starts so as to reduce
Machine can reduce cost, improve vehicle layout design flexibility to the water pipe line of urea box.
Urea level is drawn by algorithm combination electric heating device and temperature sensor, so as to cancel special urea level
Sensor, precision is high, simple in construction, cost is low.
Cancel traditional water mode of heating, be changed to Electric heating, save a large amount of supplying pipe expenses and mounting cost, have
Have the advantages that cost is low, simple in construction, arrangement flexible design.
Brief description of the drawings
Fig. 1 show the utility model structure diagram.
Embodiment
Describe specific embodiment of the present utility model in detail below in conjunction with the accompanying drawings.
A kind of electrical heating type urea liquid level sensor, by base 1, heating tube 2, urea temperature sensor 3, processor 4 etc.
Form.
Heating tube 2, temperature sensor 3, processor 4 are arranged on base 1.Processor 4 connects with Engine ECU communication,
Urea solution temperature, liquid level signal are transferred to ECU, while receive instruction and the environment temperature of heating urea.
Heating tube 2 includes internal layer PTC heating plates 201, outer layer PTC heating plates 202, heating tube temperature sensor 203, heating
Pipe shell 204 and heating tube passage 205.Heat installation internal layer PTC heating plates 201, outer layer PTC heating plates in pipe shell 204
202, heating tube temperature sensor 203 is arranged in the bottom of heating tube 2, and passage 205 is on the top of heating tube 2.
PTC (Positive Temperature Coefficient) material resistances are raised and increased with temperature, and can
To set maximum temperature.Internal layer PTC heating plates 201 are high-resistance material, and heating power is low, are only used for liquid level test, outer layer PTC
Heating plate 202 is low electrical resistant material, and heating power is high, is heated for urea solution.Controller 4 can control internal layer PTC to heat respectively
The break-make of piece 201 and outer layer PTC heating plates 202.
By internal layer and outer layer ptc material resistance per unit length value writing controller 4 at each temperature, the built-in current of controller 4
Measurement module, the electric current I of PTC heating plates 201 can be measured.
Embodiment：
When vehicle needs to measure urea level signal, processor 4 controls internal layer PTC heating plates 201 to work.Internal layer PTC
In atmosphere, urea is immersed in bottom to the top of heating plate 202.Because upper air thermal capacitance is low, poor heat conductivity, top PTC is heated rapidly
To the maximum temperature of setting.And bottom urea solution thermal capacitance is big, heat conduction is good, while the power of internal layer PTC heating plates 201 is smaller, because
This meeting thermal balance is in a relatively low temperature.
If urea level is L1, PTC heating plate overall length L, supply voltage U, worked as according to resistance per unit length data
The upper part resistance per unit length of preceding internal layer PTC heating plates 201 is ρ1, can be obtained according to the signal of heating tube temperature sensor 203 in
The lower part resistance per unit length of layer PTC heating plates 201 is ρ2, with reference to the electric current I of current internal layer PTC heating plates 2011, then currently
Liquid level
L1=U/ (ρ2-ρ1)/I1-Lρ1/(ρ2-ρ1)。
By algorithm above, the continuous liquid level of urea solution can be obtained.
When vehicle traveling, which exists, jolts, what it is due to measurement is urea level in heating tube 2, and heating tube 2 is one thin
Tubular construction, so fully limiting the fluctuation of urea level in pipe, more accurate urea level can be obtained.To ensure to heat
Liquid level is consistent with liquid level in urea tank in pipe 2, in the upper design passage 205 of heating tube 2.
Winter is less than -11 DEG C when urea solution temperature, i.e., when urea freezes, vehicle needs to thaw to urea, controller 4
Control outer layer PTC heating plates 202 heat, and according to the signal of urea temperature sensor 3, control urea temperature is in -5 DEG C~5 DEG C scopes
It is interior.
Claims (3)
1. a kind of electrical heating type urea liquid level sensor, it is characterised in that including base, heating tube, urea temperature sensor, place
Device is managed, heating tube, temperature sensor, processor are installed on base, and processor connects with Engine ECU communication；Heating tube
Including heating pipe shell, heat in pipe shell and internal layer PTC heating plates and outer layer PTC heating plates are installed, set in heating tube bottom
There is heating temperature sensor, passage is provided with heating tube top.
A kind of 2. electrical heating type urea liquid level sensor as claimed in claim 1, it is characterised in that the internal layer PTC heating
Piece heating power is less than outer layer PTC heating plate heating powers.
3. a kind of electrical heating type urea liquid level sensor as claimed in claim 1, it is characterised in that set in the processor
Current measurement module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720228975.9U CN206683718U (en) | 2017-03-10 | 2017-03-10 | A kind of electrical heating type urea liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720228975.9U CN206683718U (en) | 2017-03-10 | 2017-03-10 | A kind of electrical heating type urea liquid level sensor |
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| Publication Number | Publication Date |
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| CN206683718U true CN206683718U (en) | 2017-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720228975.9U Active CN206683718U (en) | 2017-03-10 | 2017-03-10 | A kind of electrical heating type urea liquid level sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768160A (en) * | 2017-03-10 | 2017-05-31 | 中国第汽车股份有限公司 | A kind of electrical heating type urea liquid level sensor |
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2017
- 2017-03-10 CN CN201720228975.9U patent/CN206683718U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768160A (en) * | 2017-03-10 | 2017-05-31 | 中国第汽车股份有限公司 | A kind of electrical heating type urea liquid level sensor |
| CN106768160B (en) * | 2017-03-10 | 2023-06-13 | 中国第一汽车股份有限公司 | Electric heating type urea liquid level sensor |
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