CN202008391U - Urea liquid level sensor - Google Patents
Urea liquid level sensor Download PDFInfo
- Publication number
- CN202008391U CN202008391U CN2011200606102U CN201120060610U CN202008391U CN 202008391 U CN202008391 U CN 202008391U CN 2011200606102 U CN2011200606102 U CN 2011200606102U CN 201120060610 U CN201120060610 U CN 201120060610U CN 202008391 U CN202008391 U CN 202008391U
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- Prior art keywords
- urea
- level sensor
- magnetic control
- circuit
- sensor according
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Abstract
The utility model discloses a urea liquid level sensor, which comprises a connecting part and a guiding tube. The connecting part is used for being connected with a urea box, the guiding tube is arranged on the connecting part, a magnetic floater capable of vertically moving is sleeved outside the guiding tube, a measuring circuit controlled by the magnetic floater is sealed in the guiding tube, the connecting part is provided with a signal transmitting wire connected with the measuring circuit, the measuring circuit comprises multiple groups of magnetic control units arrayed along the length direction of the guiding tube, each group of magnetic control unit comprises resistors serially connected with each other and non-contact switches, the multiple groups of magnetic control units are connected in parallel on the circuit, one end of the parallel-connection circuit is a grounded end, and the other end of the parallel-connection circuit is a signal output end. The sensor can avoid interference of external factors and pressure, has quite reliable stability, can output multiple channels of liquid level signals, and is applicable to multiple instruments.
Description
Technical field
The utility model relates to the diesel engine technologies field, particularly relates to the sensor that is used for monitoring diesel motor SCR system urea level.
Background technology
Compression ignition diesel engine is because the feature of diesel oil and combustion system thereof, few many of the relative gasoline engine of the HC of discharging, CO, but the NO of discharging
xA large amount of and deposit with PM.Therefore, the emphasis of Exhaust Control for Diesel Engine should be to reduce particle and NO
xDischarge capacity.
In order to satisfy Europe IV and above emission request, diesel engine is depended merely on the very difficult satisfied more and more stricter Abgasgesetzs of emission controls by improving combustion technology such as combustion modifications, tail gas must be up to standard by the outer exhaust aftertreatment devices ability of diesel engine, and SCR (Selective Catalytic Reduction, SCR) being to realize Europe IV/V approach the most efficiently, also is the necessary means that realizes Europe VI.Simultaneously, the engine of employing SCR technology can more effective reduction NO
xDischarging, and tangible characteristics of energy saving is arranged.
SCR is meant and is installed in the diesel car exhaust system, with the NO in the diesel emission
xBe catalysed and reduced into N
2And O
2Catalytic reduction device, generally select aqueous solution of urea as reductive agent.When in finding gas outlet oxides of nitrogen being arranged, urea tank sprays aqueous solution of urea automatically, and aqueous solution of urea and oxides of nitrogen in the SCR catalytic reactor redox reaction take place, and generates free of contamination nitrogen and water vapor and discharges, and it can be the NO in the motor exhaust
xReduce more than 50%.
In national legislation, requirement is monitored emission reduction effect, one of means are exactly to check whether urea has consumption in engine operation process, when the residue urea liquid needs less than 10% the time to report to the police, restriction engine torque when using up, the driver also must see whether needing to add urea in instrument simultaneously.In ECU (electronic control unit), need perception urea level and temperature to control the injection and the reacting dose of urea.
Present technology is to obtain liquid level signal by pressure transducer, by pressure transducer pressure is converted into electric signal output.Because the antijamming capability of pressure transducer is relatively poor, so the degree of accuracy of liquid level signal is lower, occurs distortion phenomenon easily.
In addition, pressure transducer only can be exported one road liquid level signal, and this signal is transferred to Engine ECU, and ECU sends the CAN (abbreviation of Controller Area Network then, be the serial communication protocol of ISO International standardization) message, car load receives liquid level signal with the CAN instrument.Because the cost of CAN instrument is high more a lot of than general instrument, is unfavorable for applying.
Therefore, how improving the stability and the adaptive faculty of urea level sensor, is the present technical issues that need to address of those skilled in the art.
The utility model content
The purpose of this utility model provides a kind of urea level sensor.This sensor can be avoided the interference of extraneous factor and pressure, has very reliable stability, and can export the multi-way level signal, is applicable to multiple instrument.
To achieve these goals, the utility model provides a kind of urea level sensor, comprise and be used for the web member that is connected with urea box and be located at guide pipe on the described web member, the outer cover of described guide pipe is equipped with the magnetic float that can move up and down, the inner sealing of described guide pipe has can be by the metering circuit of described magnetic float in the correspondence position conducting, and described web member is provided with the signal transmssion line that is connected with described metering circuit.
Preferably, described metering circuit comprises many groups along the magnetic control unit that described guide pipe length direction is arranged, and each organizes resistance and non-contact switch that the magnetic control unit comprises series connection respectively, and to organize the magnetic control unit in parallel on circuit more, one end of its parallel circuit is an earth terminal, and the other end is a signal output part.
Preferably, described metering circuit is provided with the identical magnetic control unit of at least two Column Layouts, and the signal output part of described at least two row magnetic control unit is separate.
Preferably, the same earth terminal of described at least two row magnetic control units shareds.
Preferably, described web member is provided with urea liquid outlet and the urea liquid return hole of inhaling the urea pipe and returning the urea pipe and be connected with described suction urea pipe and time urea pipe respectively.
Preferably, the lower end of described suction urea pipe is provided with the screen pack that is supported by fixed support.
Preferably, described non-contact switch is specially tongue tube.
Preferably, described web member is specially joint flange, and described guide pipe is fixed in the bottom of described joint flange, and described signal transmssion line is drawn from the top of described joint flange.
Preferably, described signal transmssion line has plug connector.
Preferably, further comprise the thermistor of being located at described metering circuit lower end, the two ends of described thermistor are connected in signal transmssion line.
The utility model is stable inadequately at the existing urea sensor performance; the problem of adaptive faculty difference; the mode that adopts metering circuit to combine with magnetic float is obtained liquid level signal; metering circuit is sealed in the guide pipe; protect it interference-free by guide pipe; when liquid level changes; the position of magnetic float on guide pipe also changes thereupon; can act on the different parts of metering circuit by magnetic force; thereby produce different liquid level signals; in measuring process; magnetic float does not carry out physics with metering circuit and contacts, and therefore the influence that can not be under pressure and change has very reliable stability.
In a kind of embodiment, described metering circuit comprises the magnetic control unit of many groups along described guide pipe length direction arrangement, each organizes resistance and non-contact switch that the magnetic control unit comprises series connection respectively, many group magnetic controls unit is in parallel on circuit, one end of its parallel circuit is an earth terminal, and the other end is a signal output part.When magnetic float moved up and down, the non-contact switch of correspondence position was connected simultaneously and is formed the loop.According to the size of its place loop current or voltage, determine float position, send to instrument or ECU, measure urea level.If wherein one group of magnetic control unit damages, can not influence other magnetic control unit, promptly liquid level can omnidistance distortion.
In another kind of embodiment, described metering circuit is provided with the identical magnetic control unit of at least two Column Layouts, and the signal output part of described at least two row magnetic control unit is separate.Like this, can export the non-interfering liquid level signal of two-way at least simultaneously, even on-load voltage difference, life that riches all the way is opened circuit, short circuit can not influence other one tunnel signal quality yet, the multi-way level signal can be transferred to ECU and dissimilar instrument, when coupling low side vehicle, can not use the CAN instrument, thereby reduce cost.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of liquid level sensor that the utility model is supplied urea;
Fig. 2 is the vertical view of urea level sensor shown in Figure 1;
Fig. 3 is the circuit theory diagrams of the level gauging circuit of urea level sensor shown in Figure 1;
Fig. 4 is the circuit theory diagrams of the temperature measuring circuit of urea level sensor shown in Figure 1.
Among Fig. 1 to Fig. 4:
1. joint flange 1-1. boss 2. guide pipes 3. magnetic floats 4. are inhaled 5. times urea pipes of urea pipe 4-1. urea liquid outlet 5-1. urea liquid return hole, 6. fixed supports, 7. screen packs, 8. signal transmssion lines, 9. plug connectors, 10. resistance, 11. non-contact switch, 12. thermistors
Embodiment
Core of the present utility model is to provide a kind of urea level sensor.This sensor can be avoided the interference of extraneous factor and pressure, has very reliable stability, and can export the multi-way level signal, is applicable to multiple instrument.
In order to make those skilled in the art person understand the utility model scheme better, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.
The term in expression orientation such as herein " left and right " is based on the position relation of accompanying drawing, it should be interpreted as the absolute qualification to protection domain.
Please refer to Fig. 1, Fig. 2, Fig. 1 is the structural representation of a kind of embodiment of liquid level sensor that the utility model is supplied urea; Fig. 2 is the vertical view of urea level sensor shown in Figure 1.
As shown in the figure, in a kind of embodiment, the urea level sensor that the utility model provides mainly is made of parts such as joint flange 1, guide pipe 2, magnetic float 3, suction urea pipe 4, time urea pipes 5.
Joint flange 1 is used for being connected with urea box, also be the installation basis of other each building block simultaneously, guide pipe 2 is fixed on the center of joint flange 1 bottom, magnetic float 3 is sleeved on the guide pipe 2, can move up and down along guide pipe 2, magnetic float 3 can be that density is less than the floating member of urea liquid and the subassembly of permanent magnet.
Inhale urea pipe 4 and be positioned at guide pipe 2 left sides, extend downwards from joint flange 1 always, its lower end is bending-like, and be provided with the screen pack 7 that supports by fixed support 6, inhaling urea pipe 4 is used for urea liquid is transported to urea pump, screen pack 7 can filter the impurity that exists in the urea liquid, prevents that it from entering urea pump.
Go back to the right side that urea pipe 5 is positioned at guide pipe 2, its size is shorter, the urea liquid that is used for using up is carried back urea box, the top of joint flange 1 is provided with boss 1-1, and the side of boss 1-1 is provided with urea liquid outlet 4-1 and the urea liquid return hole 5-1 that is connected with suction urea pipe 4 and time urea pipe 5 respectively.Because urea liquid has corrosivity, so guide pipe 2 is erosion-resisting stainless steel or plastics with inhaling 4 selections of urea pipe.
The inner sealing of guide pipe 2 has the metering circuit that is controlled by magnetic float, and the signal transmssion line 8 that is connected with metering circuit is drawn from the top of joint flange 1, has plug connector 9 on it.
Please refer to Fig. 3, Fig. 3 is the circuit theory diagrams of the level gauging circuit of urea level sensor shown in Figure 1.
Metering circuit is provided with the identical magnetic control unit of two Column Layouts, its signal output part P1, P2 are separate, and shared same earth terminal P0, the magnetic control element number of every row is 12 groups, and is evenly distributed along the guide pipe length direction, and each organizes resistance 10 and non-contact switch 11 that the magnetic control unit comprises series connection respectively, resistance sizes can be selected as required, 12 groups of magnetic control unit are in parallel on circuit, and an end of its parallel circuit is earth terminal P0, and the other end is signal output part P1, P2.
Obviously, the quantity of magnetic control unit is not limited to 12 groups, and looking the difference that fathoms can further increase or reduce.For example: when fathoming greatly, the size of guide pipe and metering circuit is often longer, and corresponding magnetic control element number also can increase thereupon; On the contrary, when fathoming hour, the size of guide pipe and metering circuit is often shorter, and corresponding magnetic control element number also can reduce thereupon.
When magnetic float moved up and down, the non-contact switch of correspondence position was connected simultaneously and is formed the loop, and resistance value changes in the circuit, and the voltage and current of corresponding measurement point changes.According to the size of its curtage, determine float position, promptly urea box liquid level this moment sends to instrument or ECU, measures urea level.
Owing to be provided with two row magnetic control unit, therefore can export the non-interfering liquid level signal of two-way simultaneously, even on-load voltage difference, life that riches all the way is opened circuit, short circuit can not influence other one tunnel signal quality yet, the multi-way level signal can be transferred to ECU and dissimilar instrument, when coupling low side vehicle, can not use the CAN instrument, thereby reduce cost.
Another advantage of this metering system is, if wherein one group of magnetic control unit damages, can not influence other magnetic control unit, and promptly liquid level can omnidistance distortion.
Above-mentioned non-contact switch 11 specifically can be selected tongue tube for use, and tongue tube is a kind of special key of magnetosensitive.Its two contacts are made by special material, be encapsulated in the glass tube of vacuum, when magnetic float when the tongue tube, the contact of its reed will induce opposite polarity magnetic pole.Because pole polarity attracts each other mutually on the contrary, when the magnetic force that attracts surpassed the drag of reed, the contact that separates just can adhesive, makes circuit turn-on; When magnetic force was reduced to certain value, contact returned to original state again under the effect of reed drag, and circuit is disconnected.So just, finished the effect of a switch.
As seen, the metering system of the urea level sensor that the utility model provides is that classification is measured, and its measuring accuracy depends primarily on the spacing of tongue tube, the spacing of tongue tube is more little, and measuring accuracy is high more, therefore, intensive tongue tube is set as much as possible, can improves measuring accuracy to a certain extent.But, on the other hand, might the phase mutual interference between the too intensive tongue tube, therefore, the spacing between the tongue tube should be less than the critical value of phase mutual interference.
In addition, according to general use habit, when the urea liquid in the urea box is sufficient, often and do not require that sensor has very high measuring accuracy, have only when the urea liquid in the urea box reduces to a certain degree, just need sensor accurately to measure, therefore, tongue tube can be arranged according to intensive gradually from top to bottom mode on metering circuit.
Certainly,, can also select the non-contact switch of other type, just illustrate no longer one by one here except tongue tube.
Please refer to Fig. 4, Fig. 4 is the circuit theory diagrams of the temperature measuring circuit of urea level sensor shown in Figure 1.
In order to measure the temperature of urea liquid simultaneously, on the basis of above-mentioned metering circuit, can also further increase the temperature survey function, its concrete mode is in the lower end of metering circuit thermistor 12 to be set, two ends T1, the T2 of thermistor 12 are connected in signal transmssion line, outwards draw from the top of joint flange 1.Can guarantee that like this thermistor 12 is in the following position of urea liquid liquid level all the time, thereby obtain urea liquid temperature signal accurately.
But above-mentioned urea level sensor perception urea liquid liquid level and temperature; its signal comprises two-way fully independently liquid level signal and one road temperature signal; the two-way liquid level signal is transported to ECU respectively and instrument is controlled heating and jetting system work; importing different voltages does not influence mutually; and metering circuit is sealed in the guide pipe; protect it interference-free by guide pipe; in measuring process; magnetic float does not carry out physics with metering circuit and contacts; therefore the influence that can not be under pressure and change has very reliable stability.
More than urea level sensor provided by the utility model is described in detail.Used specific case herein principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present utility model.Should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (10)
1. urea level sensor, it is characterized in that, comprise and be used for the web member that is connected with urea box and be located at guide pipe on the described web member, the outer cover of described guide pipe is equipped with the magnetic float that can move up and down, the inner sealing of described guide pipe has can be by the metering circuit of described magnetic float in the correspondence position conducting, and described web member is provided with the signal transmssion line that is connected with described metering circuit.
2. urea level sensor according to claim 1, it is characterized in that, described metering circuit comprises the magnetic control unit of many groups along described guide pipe length direction arrangement, each organizes resistance and non-contact switch that the magnetic control unit comprises series connection respectively, many group magnetic controls unit is in parallel on circuit, one end of its parallel circuit is an earth terminal, and the other end is a signal output part.
3. urea level sensor according to claim 2 is characterized in that, described metering circuit is provided with the identical magnetic control unit of at least two Column Layouts, and the signal output part of described at least two row magnetic control unit is separate.
4. urea level sensor according to claim 3 is characterized in that, the same earth terminal of described at least two row magnetic control units shareds.
5. urea level sensor according to claim 4 is characterized in that, described web member is provided with urea liquid outlet and the urea liquid return hole of inhaling the urea pipe and returning the urea pipe and be connected with described suction urea pipe and time urea pipe respectively.
6. urea level sensor according to claim 5 is characterized in that, the lower end of described suction urea pipe is provided with the screen pack that is supported by fixed support.
7. according to each described urea level sensor of claim 2 to 6, it is characterized in that described non-contact switch is specially tongue tube.
8. urea level sensor according to claim 7 is characterized in that described web member is specially joint flange, and described guide pipe is fixed in the bottom of described joint flange, and described signal transmssion line is drawn from the top of described joint flange.
9. urea level sensor according to claim 8 is characterized in that described signal transmssion line has plug connector.
10. urea level sensor according to claim 9 is characterized in that, further comprises the thermistor of being located at described metering circuit lower end, and the two ends of described thermistor are connected in signal transmssion line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200606102U CN202008391U (en) | 2011-03-09 | 2011-03-09 | Urea liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200606102U CN202008391U (en) | 2011-03-09 | 2011-03-09 | Urea liquid level sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202008391U true CN202008391U (en) | 2011-10-12 |
Family
ID=44750051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200606102U Expired - Lifetime CN202008391U (en) | 2011-03-09 | 2011-03-09 | Urea liquid level sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202008391U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192773A (en) * | 2011-03-09 | 2011-09-21 | 潍柴动力股份有限公司 | Urea liquid level sensor |
| CN110595579A (en) * | 2019-09-18 | 2019-12-20 | 一汽解放汽车有限公司 | Real-time detection method and system for urea liquid level |
-
2011
- 2011-03-09 CN CN2011200606102U patent/CN202008391U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192773A (en) * | 2011-03-09 | 2011-09-21 | 潍柴动力股份有限公司 | Urea liquid level sensor |
| CN110595579A (en) * | 2019-09-18 | 2019-12-20 | 一汽解放汽车有限公司 | Real-time detection method and system for urea liquid level |
| CN110595579B (en) * | 2019-09-18 | 2021-01-08 | 一汽解放汽车有限公司 | Real-time detection method and system for urea liquid level |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111012 |