CN101813507A - Sensor used for detecting vehicle oil level - Google Patents
Sensor used for detecting vehicle oil level Download PDFInfo
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- CN101813507A CN101813507A CN 201010170781 CN201010170781A CN101813507A CN 101813507 A CN101813507 A CN 101813507A CN 201010170781 CN201010170781 CN 201010170781 CN 201010170781 A CN201010170781 A CN 201010170781A CN 101813507 A CN101813507 A CN 101813507A
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- oil level
- fuel level
- resistance
- divider resistance
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Abstract
The invention discloses a sensor used for detecting vehicle oil level. The sensor is a thick-film potentiometer type sensor and comprises an adjustable oil level sensor divider resistor Rx of which one end V2 is connected with a positive electrode of a power supply Vcc through a divider resistor Rcons, wherein a sliding contact end of the adjustable oil level sensor divider resistor Rx is taken as a voltage output end V1 of the sensor, while the other end is taken as an earth terminal V3 of the sensor; and the earth terminal V3 of the sensor is connected with a negative electrode of the power supply Vcc. Due to the adoption of the sensor used for detecting the vehicle oil level, influence of contact resistance which is generated in a contact area between the sliding contact and a conduction band on a detection signal can be eliminated to the maximum, so the accuracy of vehicle oil level detection signal is greatly improved.
Description
Technical field
The present invention relates to a kind of oil level sensor of vehicle, particularly relate to a kind of thick film potentiometric pick-up that is used to detect vehicle fuel level.
Background technology
The sensor of existing detection vehicle fuel level in tank all adopts the two-wire system structure.Fig. 1 is existing oil level sensor of vehicle---two-wire system thick film potentiometric pick-up equivalent circuit theory figure.As seen from Figure 1, this sensor is only gathered output one road voltage signal, i.e. V1,
V1＝VCC×(Rx+Rcontact)/(Rcons+Rx+Rcontact)
Wherein, VCC is a supply voltage, and Rcons is a divider resistance, and Rx is adjustable fuel level sensor divider resistance, and Rcontact is the sliding contact of adjustable fuel level sensor divider resistance and the contact resistance between the conduction band.
In conjunction with shown in Figure 2, one road voltage signal V1 of described two-wire system thick film potentiometric pick-up output sends the controller module of instrument or other type to after the analog-digital converter conversion.
The material of conduction band (conductor electrode district) can be for containing the metal material of Ag (silver), and the material of sliding contact can be Cu (copper), Ni (nickel), Ag (silver), Zn (zinc) etc. or its alloy.Mechanical Contact is bad between sliding contact and the conduction band, and there are all easy contact area generation contact resistance Rcontact between sliding contact and conduction band such as dust in corrosion such as the surface sulfuration of sliding contact or conduction band, oxidation between sliding contact and the conduction band.
Because existing two-wire system thick film potentiometric pick-up is gathered one road signal, can't effectively eliminate the influence of the contact resistance Rcontact that causes owing to reasons such as corrosion, thereby can't obtain the resistance value of real oil level correspondence, make the oil level signal of detection inaccurate.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of sensor that vehicle fuel level detects that is used for, and can eliminate the influence of the contact resistance of contact area generation between sliding contact and the conduction band to detection signal to greatest extent, improves the accuracy of oil level detection signal.
For solving the problems of the technologies described above, the sensor that is used for the vehicle fuel level detection of the present invention is the thick film potentiometric pick-up, comprise: an adjustable fuel level sensor divider resistance Rx, the one end is connected with the positive pole of power Vcc by divider resistance Rcons, the sliding contact end of described adjustable fuel level sensor divider resistance Rx is as the voltage output end V1 of sensor, and the other end of described adjustable fuel level sensor divider resistance Rx is connected with the negative pole of power Vcc as the earth terminal V3 of sensor.
Owing to adopt above-mentioned three-wire system structure, and with the sliding contact end of the adjustable fuel level sensor divider resistance Rx voltage output end V1 as sensor, therefore, the present invention is a kind of three-wire system thick film potentiometric pick-up of high signal output performance; The contact resistance Rcontact that forms between the contact area of the sliding contact of adjustable fuel level sensor divider resistance Rx and the conduction band influence to the fuel level sensor detection signal can effectively disappear, greatly improve the accuracy of vehicle fuel level detection signal, finally make vehicle show correct oil level.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 is two-wire system thick film potentiometric pick-up equivalent circuit theory figure;
Fig. 2 is the synoptic diagram that sensor output signal shown in Figure 1 is applied to instrument or other controller;
Fig. 3 is sensor one embodiment equivalent circuit theory figure of the present invention.
Fig. 4 is the synoptic diagram that sensor output signal shown in Figure 3 is applied to instrument or other controller;
Fig. 5 is used for the sensor one example structure synoptic diagram that vehicle fuel level detects;
Fig. 6 is the sensor ceramic substrate front view that vehicle fuel level detects that is used for shown in Figure 5;
Fig. 7 is the rear view of ceramic substrate one embodiment shown in Figure 6.
Embodiment
Referring to Fig. 3, the described in one embodiment sensor that is used for the vehicle fuel level detection is a three-wire system thick film potentiometric pick-up, comprises an adjustable fuel level sensor divider resistance Rx.
Power Vcc provides supply voltage for described oil level sensor of vehicle, and its positive source is connected with the end of divider resistance Rcons.The other end of described divider resistance Rcons is connected with the end V2 of adjustable fuel level sensor divider resistance Rx.The other end of adjustable fuel level sensor divider resistance Rx can be connected with the negative pole of power Vcc as the earth terminal V3 of sensor, can also be connected with the negative pole of power Vcc by being connected in series a resistance R 1.The effect of resistance R 1 is can be as the fault diagnosis end of sensor.
The sliding contact end of described adjustable fuel level sensor divider resistance Rx is as the voltage output end V1 of sensor.
As previously mentioned, and in conjunction with shown in Figure 3, owing to reasons such as loose contact, corrosion and dusts, the sliding contact of described adjustable fuel level sensor divider resistance Rx and the contact area between the conduction band can form contact resistance Rcontact; An end that is equivalent to contact resistance Rcontact in Fig. 3 is connected with conduction band, and the other end of contact resistance Rcontact is connected with the sliding contact end of described adjustable fuel level sensor divider resistance Rx.
In conjunction with shown in Figure 4, in actual applications, the output terminal V1 of thick film potentiometric pick-up shown in Figure 3 and earth terminal V3 are connected with the respective terminal of the analog-digital converter of the controller module of instrument or other type respectively, the voltage signal V1 that collects of instrument or other controller has then just directly reflected the resistance value of true level height correspondence.The end V2 of adjustable fuel level sensor divider resistance Rx can be connected with the respective terminal of the analog-digital converter of the controller module of instrument or other type, provides power supply by the controller module of instrument or other type for sensor; Also can be connected to external power source, by external power source by divider resistance.
The described mechanism of action that is used for the sensor of vehicle fuel level detection is:
The data-acquisition loop of one, instrument and other controller is for data acquisition requirement accurately, the resistance that need guarantee sampling circuit is very big, and contact resistance Rcontact connects with data-acquisition loop, the existence of itself more help realizing data acquisition accurately, and sampling circuit is not had substantial influence.
Two, under the very large prerequisite of the resistance of aforesaid sampling circuit, sampling circuit can be considered as opening circuit, the maximum range of now supposing adjustable resistance fuel level sensor Rx be R (Rx≤R), then the sensor loop electric current I can be tried to achieve by following formula:
I=Vcc/ (Rcons+R+R1) (formula 1)
The output voltage V 1 of reflection level height can be tried to achieve by following formula,
V1=I * (Rx+R1)=Vcc * (Rx+R1)/(Rcons+R+R1) (formula 2)
Fig. 5 is a specific embodiment of oil level sensor of vehicle shown in Figure 3, it and existing two-wire system thick film potentiometric pick-up structure are basic identical, comprise that skeleton 2, hairspring spring 1, reed support 3, conduction band (conductor electrode district) 4, sliding contact 5, ceramic substrate 6, float lever assembly 7 and resistance area 9.Ceramic substrate 6, reed support 3 and hairspring spring 1 are arranged in the skeleton 2, and hairspring spring 1 supports 3 with reed and is connected, and an end of reed support 3 is provided with sliding contact 5 (being the sliding contact of described adjustable fuel level sensor divider resistance Rx).In conjunction with shown in Figure 6, ceramic substrate 6 is provided with resistance area (being described adjustable fuel level sensor divider resistance Rx) 9, and conduction band 4 is electrically connected with resistance area 9, and sliding contact 5 contacts with conduction band 4.Between an end of conduction band 4 and its exit, be serially connected with a fixed resistance R1.
The sensor place different with existing two-wire system thick film potentiometric pick-up that is used for the vehicle fuel level detection shown in Figure 5 is, the 3rd lead 10 is connected with the exit of the sliding contact of described adjustable fuel level sensor divider resistance Rx, as the voltage output end V1 of sensor.First lead 8 is connected with the exit at conduction band 4 two ends respectively with second lead 11, is equivalent to V2 and V3 among Fig. 3 respectively.
Fig. 7 is the schematic rear view of ceramic substrate 6, and wherein the exit with box indicating is the exit of the sliding contact of described adjustable fuel level sensor divider resistance Rx.
Nominal resistance between described adjustable fuel level sensor divider resistance Rx two stiff ends can be selected as required, and the output valve of the sliding contact end of described adjustable fuel level sensor divider resistance Rx changes in the nominal resistance scope.Float lever assembly 7 is under the fuel oil buoyancy function, driving reed supports 3 and rotates around the sensor revolving shaft, make the sliding contact end output of described adjustable fuel level sensor divider resistance Rx and the height of oil level change corresponding output valve, realize real-time detection oil level.Wherein, the thick-film resistor sheet of sensor is made of three parts: conductor electrode district 4, resistance area 9 and fixed resistance R1.
More than by specific embodiment the present invention is had been described in detail, but these are not to be construed as limiting the invention.Under the situation that does not break away from the principle of the invention, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection scope of the present invention.
Claims (2)
1. one kind is used for the sensor that vehicle fuel level detects, and is the thick film potentiometric pick-up, comprising:
One adjustable fuel level sensor divider resistance Rx, the one end is connected with the positive pole of power Vcc by divider resistance Rcons, it is characterized in that: the sliding contact end of described adjustable fuel level sensor divider resistance Rx is as the voltage output end V1 of sensor, and the other end of described adjustable fuel level sensor divider resistance Rx is connected with the negative pole of power Vcc as the earth terminal V3 of sensor.
2. sensor as claimed in claim 1 is characterized in that: be connected in series a resistance R 1 between the earth terminal V3 of described sensor and the negative pole of power Vcc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010170781 CN101813507A (en) | 2010-04-27 | 2010-04-27 | Sensor used for detecting vehicle oil level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010170781 CN101813507A (en) | 2010-04-27 | 2010-04-27 | Sensor used for detecting vehicle oil level |
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| CN101813507A true CN101813507A (en) | 2010-08-25 |
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| CN 201010170781 Pending CN101813507A (en) | 2010-04-27 | 2010-04-27 | Sensor used for detecting vehicle oil level |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305656A (en) * | 2011-07-29 | 2012-01-04 | 联合汽车电子有限公司 | Liquid level indicating system and contact resistance washing circuit |
| CN104833404A (en) * | 2014-11-06 | 2015-08-12 | 北汽福田汽车股份有限公司 | Oil level detection device, automobile, oil tank and oil level detection method |
| CN104833705A (en) * | 2014-10-27 | 2015-08-12 | 北汽福田汽车股份有限公司 | Automobile, and fuel oil monitoring device |
| CN105675081A (en) * | 2014-11-18 | 2016-06-15 | 大陆汽车车身电子系统（芜湖）有限公司 | Oil mass detection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002168676A (en) * | 2000-11-29 | 2002-06-14 | Nippon Seiki Co Ltd | Fuel detector for vehicle |
| EP1316782A1 (en) * | 2001-12-03 | 2003-06-04 | Siemens Aktiengesellschaft | A method and apparatus for measuring a fluid level and a motor vehicle provided with such apparatus |
| CN1854693A (en) * | 2005-04-27 | 2006-11-01 | 哈尔滨志阳汽车电气股份有限公司 | Oil-level sensor and its circuits |
| JP2008309576A (en) * | 2007-06-13 | 2008-12-25 | Yazaki Corp | Liquid level detector |
| CN201707109U (en) * | 2010-04-27 | 2011-01-12 | 联合汽车电子有限公司 | Sensor for detecting automotive oil level |
-
2010
- 2010-04-27 CN CN 201010170781 patent/CN101813507A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002168676A (en) * | 2000-11-29 | 2002-06-14 | Nippon Seiki Co Ltd | Fuel detector for vehicle |
| EP1316782A1 (en) * | 2001-12-03 | 2003-06-04 | Siemens Aktiengesellschaft | A method and apparatus for measuring a fluid level and a motor vehicle provided with such apparatus |
| CN1854693A (en) * | 2005-04-27 | 2006-11-01 | 哈尔滨志阳汽车电气股份有限公司 | Oil-level sensor and its circuits |
| JP2008309576A (en) * | 2007-06-13 | 2008-12-25 | Yazaki Corp | Liquid level detector |
| CN201707109U (en) * | 2010-04-27 | 2011-01-12 | 联合汽车电子有限公司 | Sensor for detecting automotive oil level |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305656A (en) * | 2011-07-29 | 2012-01-04 | 联合汽车电子有限公司 | Liquid level indicating system and contact resistance washing circuit |
| CN104833705A (en) * | 2014-10-27 | 2015-08-12 | 北汽福田汽车股份有限公司 | Automobile, and fuel oil monitoring device |
| CN104833404A (en) * | 2014-11-06 | 2015-08-12 | 北汽福田汽车股份有限公司 | Oil level detection device, automobile, oil tank and oil level detection method |
| CN104833404B (en) * | 2014-11-06 | 2018-11-09 | 北京宝沃汽车有限公司 | Oil level detecting device, automobile, fuel tank and oil level detection method |
| CN105675081A (en) * | 2014-11-18 | 2016-06-15 | 大陆汽车车身电子系统（芜湖）有限公司 | Oil mass detection method |
| CN105675081B (en) * | 2014-11-18 | 2019-02-01 | 大陆汽车车身电子系统（芜湖）有限公司 | Oil mass detection method |
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Open date: 20100825 |