CN102620796A - Electronic engine oil liquid level sensor - Google Patents

Abstract

The invention provides an electronic engine oil liquid level sensor, which comprises a casing and a frame, wherein the casing and the frame are clamped with each other, a hook is arranged on the frame and is fixed at the center site of a resistance wire, the two ends of the resistance wire are welded on the connecting terminals of the frame, the other two ends of the connecting terminal are welded on a printed plate part, the printed plate part is arranged inside the casing and is connected with the output contact pin of a plug through a connecting wire, and the plug is connected with the casing. The electronic engine oil liquid level sensor provided by the invention has a simple and compact structure, and functionally integrates liquid level detection and signal processing to facilitate the use of operators; and at the same time, the utilization rate of the product is increased, so as to meet the quality requirements of an automobile manufacturer.

Description

Electronic type machine oil level sensor

Technical field

The invention belongs to the sensor detecting device technical field; Be specifically related to a kind of detection that is used for automobile engine oil pan inner engine oil liquid level position; And positional information is converted into the electric signal output of standard; Through connector signal is passed to automobile controller, finally show the electronic type machine oil level sensor of fuel tank liquid level signal through instrument.

Background technology

The machine oil level sensor is used to detect the height of automobile engine oil pan inner engine oil liquid level, is to use more a kind of sensor.The machine oil level sensor that exists in the market only can be exported single resistance signal, and this resistance signal can't directly offer automobile controller, also need pass through circuit external and handle and calculate.Therefore existing machine oil level sensor generally need carry out loaded down with trivial details being connected with the signal processing circuit of outside, and not only inconvenient operation, and precision is also lower, and antijamming capability is also relatively poor.

Summary of the invention

To the above-mentioned weak point of existing machine oil level sensor, the applicant improves through research, and it is the electronic type machine oil level sensor of one that a kind of liquid collecting position signal sampling and signal Processing are provided.The present invention can directly export the receivable 0.5 ~ 4.5V voltage signal of automobile controller, and more convenient, also more accurate, antijamming capability is strong, can guarantee the quality and the performance of product, reaches the quality requirements of auto vendor.

Technical scheme of the present invention is following:

A kind of electronic type machine oil level sensor comprises the shell and the skeleton of mutual clamping, said shell and skeleton; Be connected with a crotch on the said skeleton, said crotch is fixedly connected with the centre of resistance wire, and the two-end part of said resistance wire is welded on the splicing ear of skeleton; The other two ends of said splicing ear are welded on to be printed on the board; Said printing board is installed in the shell, and said printing board is connected on the output contact pin of plug through connecting line, and said plug is connected with shell.

Its further technical scheme is: be connected through glue between said plug and the shell.

Its further technical scheme is: the head of said shell offers two pilot holes.

Its further technical scheme is: the neck of said shell is arranged with an O RunddichtringO.

Its further technical scheme is: have the turnover oilhole on the body of said shell.

Its further technical scheme is: constant current source module, one-chip computer module and DA modular converter are installed on the said printing board at least.

Useful technique effect of the present invention is:

Of the present invention simple and compact for structure, liquid level position detection and signal Processing are combined, the handled easily person uses; It has improved the utilization factor of product simultaneously, can reach the quality requirements of auto vendor.

Description of drawings

Fig. 1 is an one-piece construction synoptic diagram of the present invention.

Fig. 2 is a shell mechanism synoptic diagram of the present invention.

Fig. 3 is a skeleton structure synoptic diagram of the present invention.

Fig. 4 is the components and parts catenation principle figure on the printing board of the present invention.

[reference numeral explanation]

Print board 1resistance wire 8

Shell 2crotches 9

Plug 3output contact pins 10

Skeleton 4pilot holes 11

Connectingline 5splicing ears 12

O RunddichtringO 6 is into and out ofoilhole 13

Glue 7solder joints 14.

 

Embodiment

For enabling further to understand characteristic of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide reference and the explanation usefulness, be not to be used for the present invention is limited.

As shown in Figure 1, the present invention mainly contains shell 2 (structure sees Fig. 2 for details) and skeleton 4 (structure sees Fig. 3 for details) and forms, andshell 2 andskeleton 4 mutual clampings are packedskeleton 4 in theshell 2 into again.Onecrotch 9 is arranged on theskeleton 4, be used for fixing, be used to preventresistance wire 8 distortion with the centre ofresistance wire 8; The two ends ofresistance wire 8 then are welded on thesolder joint 14 ofsplicing ear 12 of skeleton 4.The other two ends ofsplicing ear 12 are welded to be printed on theboard 1, promptlyprints board 1 and is connected withskeleton 4 throughsplicing ear 12, andprinting board 1 is packed in the shell 2.Print board 1 and be connected on theoutput contact pin 10 ofplug 3, carry out signal output through connectingline 5; In addition, being connected betweenplug 3 and theshell 2, realize through in the cavity ofshell 2 andplug 3, pouring intoglue 7, play fixing, shockproof effect.In addition,shell 2 heads have twopilot holes 11, are used for the location, and it can make the position of sensor and fuel tank remain unchanged;Shell 2 necks are arranged with an O RunddichtringO 6, are used to prevent that oil spills in the fuel tank; Onshell 2 bodies, offer and to supply oil-feed and fuel-displacedpore 13, be used to guarantee the accuracy of the pasta of surveying.

As shown in Figure 4, the present invention adopts resistance wire to come 8 to gather liquid level signal, exports with resistancesignal.Resistance wire 8 is electrically connected throughskeleton 4 and printing board 1.In the internal circuit of printing board 1 a constant current source module is arranged, be used for power supply being provided toresistance wire 8; Adopting one-chip computer module to control the constant current source module in the internal control circuit ofprinting board 1 is applied on theresistance wire 8; Produce collectable voltage signal; Carry out the modulus sampling throughprinting board 1 inner DA modular converter then; And collection result carried out computational analysis, the 0.5-4.5V voltage signal that output at last can be received by automobile controller shows the fuel tank liquid level signal through instrument at last.

Principle of work of the present invention is following: use onesection resistance wire 8 with positive temperature coefficient (PTC) (PTC), during temperature change, its resistance can rise according to certain rule.Part resistance wire 8 immerses in the tested machine oil during installation, and remainder is exposed in the air.Behind the electric current that applies a fixed size and set time length to sensor resistance,resistance wire 8 heatings cause changes in resistance.Because the coefficient of heat conductivity of machine oil and air is different, corresponding to the machine oil liquid level of differing heights, the temperature variation ofresistance wire 8 is also different, and resistance variations is also different.Single-chip microcomputer is gathered its output signal, and handles, and the signal of output converts the receivable simulating signal of controller into through the DA conversion.

Above-described only is preferred implementation of the present invention, the invention is not restricted to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from basic design of the present invention, all should think to be included within protection scope of the present invention.

Claims (6)

1. electronic type machine oil level sensor; It is characterized in that: the shell (2) and the skeleton (4) that comprise mutual clamping; Be connected with a crotch (9) on the said skeleton (4), said crotch (9) is fixedly connected with the centre of resistance wire (8), and the two-end part of said resistance wire (8) is welded on the splicing ear (12) of skeleton (4); The other two ends of said splicing ear (12) are welded on to be printed on the board (1); Said printing board (1) is installed in the shell (2), and said printing board (1) is connected to through connecting line (5) on the output contact pin (10) of plug (3), and said plug (3) is connected with shell (2).

2. according to the said electronic type machine oil of claim 1 level sensor, it is characterized in that: be connected through glue (7) between said plug (3) and the shell (2).

3. according to the said electronic type machine oil of claim 1 level sensor, it is characterized in that: the head of said shell (2) offers two pilot holes (11).

4. according to the said electronic type machine oil of claim 1 level sensor, it is characterized in that: the neck of said shell (2) is arranged with an O RunddichtringO (6).

5. according to the said electronic type machine oil of claim 1 level sensor, it is characterized in that: have turnover oilhole (13) on the body of said shell (2).

6. according to the said electronic type machine oil of claim 1 level sensor, it is characterized in that: constant current source module, one-chip computer module and DA modular converter are installed on the said printing board (1) at least.

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