CN201707109U - Sensor for detecting automotive oil level - Google Patents
Sensor for detecting automotive oil level Download PDFInfo
- Publication number
- CN201707109U CN201707109U CN2010201862648U CN201020186264U CN201707109U CN 201707109 U CN201707109 U CN 201707109U CN 2010201862648 U CN2010201862648 U CN 2010201862648U CN 201020186264 U CN201020186264 U CN 201020186264U CN 201707109 U CN201707109 U CN 201707109U
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- sensor
- fuel level
- oil level
- resistance
- level sensor
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Abstract
The utility model discloses a sensor for detecting the automotive oil level. The sensor, which is a thick-film potentiometer type sensor, comprises an adjustable oil level sensor resistor divider Rx, one end V2 of which is connected with the anode of a power supply Vcc through a resistor divider Rcons, wherein the sliding contact end of the adjustable oil level sensor resistor divider Rx serves as a power output end V1 of the sensor, and the other end of the adjustable oil level sensor resistor divider Rx serves as a grounded end V3 of the sensor, which is connected with the cathode of the power supply Vcc. The utility model can eliminate the affection of contact resistance generated by the contact area between a sliding contact and a conduction band on detection signals to the max, thus greatly increasing the accuracy of automotive oil level detection signals.
Description
Technical field
The utility model relates to a kind of oil level sensor of vehicle, particularly relates 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.
The utility model content
The technical problems to be solved in the utility model provides a kind of sensor that vehicle fuel level detects that is used for, can eliminate of the influence of the contact resistance of contact area generation between sliding contact and the conduction band to greatest extent, improve the accuracy of oil level detection signal 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 utility model 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 utility model 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
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
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 utility model.
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 utility model is had been described in detail, formation is to restriction of the present utility model but these are not.Under the situation that does not break away from the utility model principle, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection domain of the present utility model.
Claims (2)
1. one kind is used for the sensor that vehicle fuel level detects, be 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, 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 |
|---|---|---|---|
| CN2010201862648U CN201707109U (en) | 2010-04-27 | 2010-04-27 | Sensor for detecting automotive oil level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201862648U CN201707109U (en) | 2010-04-27 | 2010-04-27 | Sensor for detecting automotive oil level |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201707109U true CN201707109U (en) | 2011-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201862648U Expired - Lifetime CN201707109U (en) | 2010-04-27 | 2010-04-27 | Sensor for detecting automotive oil level |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201707109U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813507A (en) * | 2010-04-27 | 2010-08-25 | 联合汽车电子有限公司 | Sensor used for detecting vehicle oil level |
-
2010
- 2010-04-27 CN CN2010201862648U patent/CN201707109U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813507A (en) * | 2010-04-27 | 2010-08-25 | 联合汽车电子有限公司 | Sensor used for detecting vehicle oil level |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110112 |