Summary of the invention
The application provides a kind of Intelligent control device of windshield wiper that can more precisely identify rainfall size.
A kind of embodiment provides a kind of Intelligent control device of windshield wiper, comprising:
Microwave remote sensor, its reflection electromagnetic wave for being reflected back to shield glass emission frequency electromagnetic waves and reception, and according to the electromagnetic wave launched and the reflection electromagnetic wave being reflected back one Doppler signal of output;
Amplifier, it is electrically connected with microwave remote sensor, for exporting after obtaining the Doppler signal of microwave remote sensor output and being amplified;
And processor, it is electrically connected with amplifier, processor is used for the Doppler signal obtained after the amplification of amplifier output, rainfall high low signal is obtained after the LDA signal processor after amplification, and judge rainfall rank according to rainfall high low signal, finally send an order code corresponding with rainfall rank to automobile middle control device.
Further, microwave remote sensor is fast and different raindrop size for different densities, different rain, exports different Doppler signals.
Further, being provided with A/D converter and digital filter in processor, processor obtains the Doppler signal after amplifying, and the Doppler signal after amplification successively obtains rainfall high low signal after A/D converter conversion and numeral filters filter process.
Further, the multistage rainfall high low signal template of rainfall high low signal Yu pre-stored is contrasted by processor one by one, it is judged that rainfall high low signal is the highest with which grade rainfall high low signal template similarity, it is determined that the rank of current rainfall size.
Further, processor is also pre-stored with the mapping table that multistage rainfall size is corresponding with order code, and processor obtains the order code of correspondence according to the rainfall rank judged from mapping table, and order code is sent to automobile middle control device.
Further, microwave remote sensor is arranged in the support of shield glass rearview mirror, and the sensitive surface of microwave remote sensor is arranged towards vehicle front.
Further, microwave remote sensor, amplifier and processor are encapsulated in a container, and container is embedded in the support of shield glass rearview mirror.
Further, processor is single-chip microcomputer.
Intelligent control device of windshield wiper according to above-described embodiment, owing to sensor is microwave remote sensor, microwave remote sensor passes through to shield glass emission frequency electromagnetic waves, electromagnetic wave runs into whereabouts raindrop back reflection and returns reflection electromagnetic wave so that microwave remote sensor exports a Doppler signal with intermediate-freuqncy signal feature after can passing through the electromagnetic wave launched and the reflection electromagnetic wave mixing being reflected back. Amplified by amplifier and processor processes this Doppler signal thus obtaining raindrop size, rainfall density and rainwater falling speed information, the size of comprehensive descision rainfall, the accuracy of identification making rainfall size is higher, it is possible to control start and stop and the speed of rain brush more intelligently.
Detailed description of the invention
The present invention is described in further detail in conjunction with accompanying drawing below by detailed description of the invention.
Provide a kind of Intelligent control device of windshield wiper in the present embodiment, Intelligent control device of windshield wiper is arranged on automobile, realize the detection identification to vehicle front rainfall size, and send corresponding instruction to automobile middle control device, control rain brush and timely and effectively shield glass is carried out wiping, improve drive experience coefficient and the safety coefficient of driver.
As it is shown in figure 1, Intelligent control device of windshield wiper includes microwave remote sensor 1, amplifier 2 and processor 3. The receiving terminal of the outfan of sensor 1 and amplifier 2 is electrically connected, the receiving terminal of the outfan of amplifier 2 and processor 3 is electrically connected, the receiving terminal of the outfan of processor 3 and automobile middle control device 4 is electrically connected, and the driving device of automobile middle control device 4 and rain brush is electrically connected.
As shown in Figures 2 and 3, microwave remote sensor 1, amplifier 2 and processor 3 are encapsulated in a container 5, container 5 is embedded in the support of shield glass rearview mirror, the electromagnetic sensitive surface of can launching and accept of microwave remote sensor 1 is arranged towards vehicle front so that microwave remote sensor 1 can be launched frequency electromagnetic waves and accept the reflection electromagnetic wave being reflected back to shield glass front.Intelligent control device of windshield wiper can be directly encapsulated in the groove on the support of shield glass rearview mirror in other embodiments.
Microwave remote sensor 1 for launching frequency electromagnetic waves to shield glass front, electromagnetic wave is running into the obstacle back reflections such as raindrop, microwave remote sensor 1 receives the reflection electromagnetic wave being reflected back toward, and one Doppler signal with intermediate-freuqncy signal feature of output after the electromagnetic wave of transmitting is mixed with the reflection electromagnetic wave being reflected back, export from outfan. Fast and the different raindrop size for different densities, different rain, microwave remote sensor 1 exports different Doppler signals.
Amplifier 2 obtains Doppler signal by receiving terminal from the outfan of microwave remote sensor 1, and is amplified this Doppler signal processing. Concrete, amplifier 2 selects the signal of wherein useful bandwidth to be amplified from Doppler signal, filters a part of clutter simultaneously. Finally the Doppler signal after amplification is exported to processor 3 from outfan.
Processor 3 is single-chip microcomputer, A/D converter 31, digital filter 32 and central processing unit 33 it is provided with in single-chip microcomputer, processor 3 obtains the Doppler signal after amplifying by receiving terminal from the outfan of amplifier 2, first pass through A/D converter and the Doppler signal of amplification is converted into digital signal, then through digital filter 32, digital signal moderate rain being swiped the interference signals such as work to filter out, final process obtains can be used for judging the rainfall high low signal of rainfall size.
The memory module of processor 3 is previously stored with multistage rainfall high low signal template, rainfall size is divided into multiple rank, and the order code that the rainfall of different stage is corresponding different. After central processing unit 33 obtains rainfall high low signal, rainfall high low signal and multistage rainfall high low signal template can be contrasted one by one, contrast rainfall high low signal the highest with the rainfall high low signal template similarity of certain grade, namely judge that current rainfall is sized to this rank.
The mapping table that multistage rainfall size is corresponding with order code also it is pre-stored with at processor 3. The different control code that different rainfall sizes are corresponding, the two variable is associating by mapping table so that central processing unit 33 can be quickly found corresponding control code according to rainfall size.
Processor 3 finds out the order code of correspondence according to the rank of current rainfall from mapping table, and order code is sent to automobile middle control device 4, and automobile middle control device 4 controls the driving device of rain brush according to order code, thus controlling start and stop and the speed of rain brush.
As shown in Figure 4, the principle steps of the Intelligent control device of windshield wiper that the present embodiment provides is as follows:
S101: launch electromagnetic wave;
Microwave remote sensor 1 launches frequency electromagnetic waves to shield glass front.
S102: obtain reflection electromagnetic wave and export Doppler signal;
Microwave remote sensor 1 obtains the reflection electromagnetic wave that is reflected back toward, and by one Doppler signal with intermediate-freuqncy signal feature of output after the electromagnetic wave of transmitting and the reflection electromagnetic wave mixing that is reflected back.
S103: amplify Doppler signal;
Doppler signal is filtered and amplifies by amplifier 2, and removal part disturbs signal.
S104: process and obtain rainfall high low signal;
Doppler signal after amplification is successively changed by the A/D converter 31 in processor 3 and obtains rainfall high low signal after digital filter 32 filtration treatment.
S105: judge rainfall rank;
Rainfall high low signal and multistage rainfall high low signal template are contrasted by central processing unit 33 one by one, contrast rainfall high low signal and which grade rainfall high low signal template similarity the highest, it is judged that the rank of current rainfall size.
S106: send order code;
Central processing unit 33 finds out the order code corresponding with rainfall size according to mapping table, and order code is sent to automobile middle control device 4.
S107: control rain brush.
After automobile middle control device 4 obtains the order code that processor 3 sends, control the driving device of rain brush, control the action of rain brush.
The Intelligent control device of windshield wiper that the present embodiment provides have employed microwave remote sensor 1 due to sensor, microwave remote sensor 1 can launch frequency electromagnetic waves to shield glass front, electromagnetic wave is stopped back reflection by measured objects such as rainwater so that microwave remote sensor can by one Doppler signal with intermediate-freuqncy signal feature of output after the electromagnetic wave launched and the reflection electromagnetic wave being reflected back mixing. Amplified by amplifier 2 and processor 3 processes this Doppler signal thus obtaining raindrop size, rainfall density and rainwater falling speed information, by comprehensively judging the size of rainfall, it is possible to judge rainfall size accurately, be light rain, heavy rain or heavy rain. And optical pickocff of the prior art is only by the rainfall size that judges how short of rain that covers of shield glass, and moderate rain just can make shield glass be covered with rainwater, therefore prior art judges not accurate enough. Different rainfall sizes then can be identified by this Intelligent control device of windshield wiper, thus controlling rain brush to make different actions, the rainwater on more effective removing shield glass, improves the security performance driven.
The present invention is illustrated by use above specific case, is only intended to help and understands the present invention, not in order to limit the present invention. For those skilled in the art, according to the thought of the present invention, it is also possible to make some simple deductions, deformation or replacement.