CN101561308A

CN101561308A - Automobile fuel volume non-contact photoelectric sensor

Info

Publication number: CN101561308A
Application number: CNA2008100547874A
Authority: CN
Inventors: 杨振福
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-04-15
Filing date: 2008-04-15
Publication date: 2009-10-21

Abstract

An automobile fuel volume non-contact photoelectric sensor is made by the characteristic that a photoresistance varies according to the variation of the strength and the irradiation area of light. When the fuel is in a full state, a float 16 is located in the top position, a shading plate 2 hardly shades light emitted from a light source 5, and the photoresistance is minimum; when the fuel reduces, the shading plate 2 decreases correspondingly to shade corresponding light ray of the light source 5, and the photoresistance increases correspondingly; and when the fuel deceases to an empty state, the shading plate 2 is located in the lowest position and nearly shades all light ray of the light source 5, and the photoresistance is maximum and designed to be null.

Description

Automobile fuel volume non-contact photoelectric sensor

Technical field:

The invention belongs to vehicle fuel control technology field, be specifically related to automobile fuel volume non-contact photoelectric sensor

Background technology:

Existing fuel quantity sensor owing to exist contact to slide, occurs skimming wear for contact swept resistance formula, wearing and tearing cause surface of contact to change, even disengage, and contact wear is the main cause that causes this formula sensor to damage, cause sensor to damage in early days, the failure rate height is difficult for repairing.

Summary of the invention:

The non-contacting sensor that the present invention is directed to the defective of above-mentioned touch sensor existence and make.Non-contact photoelectric sensor utilizes thermal value extremely low, light emitting diode (LED) is a light source (also can select other illuminating part for use), utilize photoresistance to the variation of the power of light, irradiated area and the characteristics of respective change make, promptly when intensity of illumination is constant, the increase of illuminating area, photoresistance present the resistance value that diminishes, this formula sensor that utilizes this rule to make.Because there is the growth along with service time in light emitting diode, and the defective of illumination decay occurs, the spy is provided with light emitting diode voltage trim knob, when luminous intensity decays to a certain degree, when the oil mass index error of appearance is big, finely tunes reparation.

Fig. 1 is the sensor circuit synoptic diagram, its circuit is, during Closing Switch K, power supply B positive pole--K switch---fuse RD---transformation voltage stabilizer T terminal 1---transformation voltage stabilizer T terminal 2---connects iron, transformation voltage stabilizer T terminal 3 output 3V voltages--light emitting diode (LED)---connect iron, another road, fuse RD-transformation voltage stabilizer E terminal 4---transformation voltage stabilizer E terminal 6---in parallel simultaneously connect iron, and output 10V voltage---fuel capacity table C---photoresistance RG---connects iron to transformation voltage stabilizer E terminal 5.A is a shadow shield, following the going up of shadow shield moved, can block or we opens the light of diode (LED) emission, the illuminating area that shines on the photoresistance RG is changed, make the resistance value of photoresistance RG that corresponding change also take place, when shadow shield A descends, sheltered from according to respective ray of light to photoresistance RG, photoresistance presents the big resistance of phase strain, when shadow shield A makes progress us when opening, increased according to respective ray of light to photoresistance RG, photoresistance RG presents the corresponding resistance that diminishes, and TF is the vernier adjustment knob of T terminal 3 output 3V voltages, the luminous power of scalable light emitting diode.

Description of drawings:

Accompanying drawing 1 is automobile fuel volume non-contact photoelectric sensor circuit diagram structure figure

Among the figure:

B, power supply, 12V or 24V direct current, K, switch, RD, fuse, T, transformation voltage stabilizer output 3V direct current, TF, 3V voltage trim knob, LED, light emitting diode, E, transformation voltage stabilizer output 10V direct current, C, fuel capacity table, RG, photoresistance, A, shadow shield.

Accompanying drawing 2 explanations:

1, float frame, 2, shadow shield, 3, float lever, 4, attachment screw, 5, light source, 6, anodal circuit, 7, negative pole circuit, 8, light-sensitive surface, 9, photoresistance, 10, lower limit end, 11, fixedly overhead kick, 12, positive wire, 13, cathode conductor, 14, the photoresistance lead, 15, the photoresistance lead, 16, float, 17, the upper limit end.

Embodiment:

Automobile fuel volume non-contact photoelectric sensor is by float frame 1, shadow shield 2, and float lever 3, light source 5, photoresistance 9, float 16 is formed, and hinged float lever 3 is provided with shadow shield 2 on it on float frame 1, is connected and fixed photoresistance 9, light source 5 on float frame 1.Light source 5, can be the light emitting diode (LED) that welds together of, two, several (closely arrange) and make particular transmission light (face).

Fig. 2 is this inventive embodiment: 1 is the float frame, on existing float frame, change a social system and form, float lever 3 hinge holes are set on it, can move up and down the oval connecting hole of light source 5, lower limit end 10, upper limit end 17, the fixedly overhead kick 11 of photoresistance 9, and lead 12,13,14,15 splicing ear, 5 is light source, connecting hole is set on it, anodal circuit 6, negative pole circuit 7, light emitting diode (LED) is welded on its circuit, and make the parallel particular transmission light (face) that is slightly larger than light-

sensitive surface

8,9 are photoresistance, and it is float lever that specific light-

sensitive surface

8,3 is set on it, shadow shield 2 is set, float 16 on it.Light emitting diode can weld one, two, several (closely arranging) composition light sources 5 on anodal circuit 6 negative pole circuits 7, make it reach the luminous intensity requirement, its illuminance of the light emitting diode that welds together has slight inhomogeneous, shadow shield 2 is welded on the float lever 3, and float 16 is clamped on the other end of float lever 3.The assembling of this sensor, the splicing ear that lead 12,13,14,15 is welded to respectively on the float frame 1, the light source 5 usefulness screws 4 that are welded with lead equally are fastened on the float frame 1, the mode of the photoresistance 9 usefulness existing fixed overhead kicks 11 that are welded with lead equally (draw among the figure symmetry another), be fastened on the float frame 1, the existing articulated manner of float lever 3, be hinged on the float frame 1, the lead of same color separately of pegging graft, assembling finishes.After assembling finishes, need under emulation mode, rotation TF regulates the standard electric resistance of " expiring " or " sky ", also can move up and down light source 5 and regulate.The course of work of this sensor: behind Closing Switch K, light source 5, photoresistance 9 is all switched on and has been constituted the loop, when fuel oil is in the state of " expiring ", float 16 is in the extreme higher position, shadow shield 2 also is in the extreme higher position, the float lever 3 upper limit end 17 of conflicting, shadow shield 2 does not almost block the light that light source 5 sends, the light full illumination that the light-sensitive surface 8 of photoresistance 9 is almost sent by light source 5, the resistance value minimum of photoresistance this moment, its resistance is the resistance when being designed to " expiring ", when fuel oil slowly descends variation, float 16 shadow shields 2 are followed corresponding decline and are changed, shadow shield 2 has correspondingly sheltered from the light of light source 5 irradiations to light-sensitive surface 8, the resistance value of photoresistance 9 will correspondingly increase, fuel gauge indicates corresponding fuel capacity, when fuel oil is reduced to the state of " sky ", float 16 is in extreme lower position, shadow shield 2 also is in extreme lower position, the float lever 3 lower limit end 10 of conflicting, the almost whole shields of shadow shield 2 have been lived the light of light source 5 irradiations to light-sensitive surface 8, the resistance value maximum of photoresistance 9 this moment, and its resistance is for being designed to the resistance of " sky ".

The present invention can make corresponding resistance variations form according to the characteristic of electrothermal, electromagnetic type fuel capacities chart.Such as above-mentioned inverse state: when oil was in the state of " expire " certainly, shadow shield 2 almost all blocked the light of light source 5, and photoresistance this moment resistance maximum, this resistance are the resistance when being designed to " expiring "; When fuel oil was in the state of " sky ", the light of light source 5 is full illumination light-sensitive surface 8 photoresistance this moment resistance minimums almost, and this resistance is the resistance when being designed to " sky ".

Claims

1. automobile fuel volume non-contact photoelectric sensor is made up of float frame (1) shadow shield (2) float lever (3) light source (5) photoresistance (9) float (16), it is characterized in that going up hinged float lever (3) at float frame (1) is provided with shadow shield (2) on it is connected and fixed photoresistance (9) light source (5) on float frame (1).