CN202421067U

CN202421067U - Car rain sensor

Info

Publication number: CN202421067U
Application number: CN2011205308415U
Authority: CN
Inventors: 王进丁; 王正成
Original assignee: Changhui Automobile Electric Systems (anhui) Co Ltd
Current assignee: Changhui Automobile Electric Systems (anhui) Co Ltd
Priority date: 2011-12-19
Filing date: 2011-12-19
Publication date: 2012-09-05
Anticipated expiration: 2021-12-19

Abstract

The utility model discloses a car rain sensor, comprising a CPU (central processing unit), an A/D (analog to digital) conversion module, a LIN (local interconnect network) bus connected with output end of the CPU and a luminous tube driving module connected with the CPU, wherein the luminous tube driving module is connected with a luminous tube; a photosensitive receiver tube opposite to the luminous tube is arranged below a optics lens; the photosensitive receiver tube, a band-pass amplifying module, a rectifying module, a direct-current amplifying module, the A/D conversion module and the CPU are connected in turn. The rain sensor can monitor rainfall reliably and accurately and is difficult to be influenced by the external environment.

Description

A kind of automobile rainfall sensor

Technical field

The utility model relates to automobile sensor, especially relates to a kind of automobile rainfall sensor.

Background technology

Along with developing rapidly of automotive engineering, the control device on the automobile is more and more intelligent.Change intelligent windscreen wiper system into from the traditional mechanical windscreen wiper system gradually like the wiper system, improve comfortableness and security when driving a car.

Intelligent windscreen wiper system mainly detects the size of rainfall automatically through rain sensor, the output signal according to the automatic speed of controlling windscreen wiper of the size of rainfall, makes windshield have best visibility, guarantees the security of driving.But existing rain sensor exists unreliable, the poor accuracy of rainfall monitoring, the problem that sensor is affected by the external environment easily more.

The utility model content

The purpose of the utility model provides a kind of automobile rainfall sensor, and existing automobile rainfall sensor rainfall monitoring is unreliable to solve, the problem of poor accuracy.

The utility model solves the technical scheme that its technical matters adopted: a kind of automobile rainfall sensor; Comprise CPU and A/D modular converter and the LIN bus that is connected with the CPU output terminal; Also comprise the luminotron driver module that is connected with CPU; The luminotron driver module is connected with luminotron, has the photosensitive receiving tube relative with luminotron at optical mirror slip, and described photosensitive receiving tube, the logical amplification module of band, rectification module, direct current amplification module, A/D modular converter, CPU connect in order.

The described luminotron driver module that is connected with CPU comprises left luminotron driver module and right luminotron driver module; Described luminotron comprises left luminotron and right luminotron; Described left luminotron driver module links to each other with left luminotron, and described right luminotron driver module links to each other with right luminotron.

Also be provided with the surround lighting detector tube in the described rain sensor, described surround lighting detector tube links to each other with CPU.

Be parallel with the temperature balance module on the described direct current amplification module.

The beneficial effect of the utility model: luminotron sends infrared ray, thereby makes the photosensitive receiving tube receiving optical signals, and raindrop drop on the optical mirror slip during rainy day; Light reflects; The reflection ray that photosensitive receiving tube receives reduces, and raindrop multiple reflection more give the light of photosensitive receiving tube few more, and this signal is finally passed to CPU; CPU drives rain shaving electrical machine and acts accordingly through LIN bus output fill order.This rain sensor is reliable to the rainfall monitoring, accuracy is high, and is difficult for being affected by the external environment good operating stability.

Below will combine accompanying drawing and embodiment, the utility model will be carried out comparatively detailed explanation.

Description of drawings

Fig. 1 is the utility model automobile rainfall sensor organigram.

Fig. 2 is the utility model automobile rainfall sensor principle of work block diagram.

Among the figure: 1. luminotron, 2. photosensitive receiving tube, 3. surround lighting detector tube.

Embodiment

Embodiment 1, and is as depicted in figs. 1 and 2, a kind of automobile rainfall sensor, and the rain sensor surface of shell is provided with layer of transparent silica gel, and an optical mirror slip is arranged at the silica gel bottom, and this optical mirror slip forms with the silica gel optical surface.6 luminotrons 1 and a photosensitive receiving tube 2 are arranged under the optical mirror slip, and luminotron is the infrared light emission pipe.6 luminotrons are distributed in each drift angle by regular hexagon, and photosensitive receiving tube is placed in the center.About being divided into of luminotron symmetry two groups, synchronization has only one group of luminotron work.The synchronization photosensitive receiving tube can only receive the signal of one group of luminotron like this.Through to left and right two groups of signal analysis of alternately transmitting, distinguish the rainfall size, detect extraneous various interference simultaneously, prevent misoperation.Described luminotron and photosensitive receiving tube all are devices of crossing through special optimization, and luminotron can send the good IR of optical property after driving via modulation waveform, the responsive reception of wave band that photosensitive receiving tube only sends luminotron.

Automobile rainfall sensor; The LIN bus that also includes CPU and A/D modular converter and be connected with the CPU output terminal; Also comprise the luminotron driver module that is connected with CPU; The luminotron driver module is connected with luminotron, has the photosensitive receiving tube relative with luminotron at optical mirror slip, and described photosensitive receiving tube, the logical amplification module of band, rectification module, direct current amplification module, A/D modular converter, CPU connect in order.The described luminotron driver module that is connected with CPU comprises left luminotron driver module and right luminotron driver module; Described luminotron comprises left luminotron and right luminotron; Described left luminotron driver module links to each other with left luminotron, and described right luminotron driver module links to each other with right luminotron.Be parallel with the temperature balance module on the described direct current amplification module.

Be mounted on the windshield automobile rainfall sensor and when powering on, rain sensor will send a signal, drive rain shaving electrical machine work once.This wiping is used for the tracking correction of rain sensor to inner parameter.Luminotron drives through the luminotron driver module and sends the certain IR of frequency, and emission angle is between 43 ° to 63 °.The light that when no rain, utilizes the total reflection law that luminotron is sent all reflects gives photosensitive receiving tube; Raindrop drop on the optical mirror slip during rainy day, and light reflects, and the light that photosensitive receiving tube receives reduces, and raindrop multiple reflection more give the light of photosensitive tube few more.The emission of light with receive to adopt the mode of dividing control about a kind of, another group is not worked during one group of work, same time photosensitive receiving tube receives only one group light signal.The signal of photosensitive receiving tube collection is sent among the CPU through each module, calculates the size of judging rainfall, CPU drives rain shaving electrical machine and acts accordingly through LIN bus output fill order.This rain sensor is reliable to the rainfall monitoring, accuracy is high, and is difficult for being affected by the external environment good operating stability.

Embodiment 2, on the basis of embodiment 1, also are provided with surround lighting detector tube 3 in the described rain sensor, and described surround lighting detector tube 3 links to each other with CPU.Surround lighting detector tube 3 is a photosensitive tube, and when the extraneous light of environment shines photosensitive tube, photosensitive tube will produce electric current, and the light electric current of strong production more is big more, thus the intensity of monitoring of environmental light.And according to the light intensity of monitoring out, CPU calculates and sends out through the LIN bus fill order of car light.Wherein, rainfall test section and surround lighting test section are separate parts, and two-part measuring ability does not exert an influence each other.

Claims

1. automobile rainfall sensor; Comprise CPU and A/D modular converter and the LIN bus that is connected with the CPU output terminal; It is characterized in that: also comprise the luminotron driver module that is connected with CPU; The luminotron driver module is connected with luminotron, has the photosensitive receiving tube relative with luminotron at optical mirror slip, and described photosensitive receiving tube, the logical amplification module of band, rectification module, direct current amplification module, A/D modular converter, CPU connect in order.

2. automobile rainfall sensor as claimed in claim 1; It is characterized in that: the described luminotron driver module that is connected with CPU comprises left luminotron driver module and right luminotron driver module; Described luminotron comprises left luminotron and right luminotron; Described left luminotron driver module links to each other with left luminotron, and described right luminotron driver module links to each other with right luminotron.

3. automobile rainfall sensor as claimed in claim 1 is characterized in that: also be provided with the surround lighting detector tube in the described rain sensor, described surround lighting detector tube links to each other with CPU.

4. like each described automobile rainfall sensor of claim 1 to 3, it is characterized in that: be parallel with the temperature balance module on the described direct current amplification module.