Mfundo yogwirira ntchito ndi malo oyika zosinthira radar
Dzina lonse la radar yobwerera ndi "reversing anti-collision radar", yomwe imatchedwanso "parking axiliary device", kapena "reversing computer warning system". Chipangizocho chimatha kuweruza mtunda wa zopinga ndikulangiza momwe zinthu zilili zopinga kuzungulira galimotoyo kuti zithandizire chitetezo chobwerera.
Choyamba, ntchito mfundo
Kubwezeretsa radar ndi chipangizo chothandizira chitetezo cha parking, chomwe chimapangidwa ndi ultrasonic sensor (yomwe imadziwika kuti probe), wolamulira ndi mawonetsedwe, alamu (nyanga kapena buzzer) ndi mbali zina, monga momwe tawonetsera pa Chithunzi 1. Ultrasonic sensor ndi gawo lalikulu la dongosolo lonse lobwerera. Ntchito yake ndikutumiza ndi kulandira mafunde a ultrasonic. Mapangidwe ake akuwonetsedwa mu Chithunzi 2. Pakalipano, kafukufuku wogwiritsidwa ntchito kawirikawiri wa 40kHz, 48kHz ndi 58kHz mitundu itatu. Nthawi zambiri, kumtunda kwa ma frequency, kumapangitsanso kukhudzika, koma njira yopingasa komanso yoyima ya mbali yodziwikirayi ndi yaying'ono, choncho nthawi zambiri gwiritsani ntchito kafukufuku wa 40kHz.
Astern radar utenga akupanga kuyambira mfundo. Galimoto ikayikidwa m'magiya am'mbuyo, radar yobwerera imalowa m'malo ogwirira ntchito. Poyang'aniridwa ndi woyang'anira, kafukufuku woikidwa pa bamper yakumbuyo amatumiza mafunde akupanga ndi kupanga ma echo chizindikiro akakumana ndi zopinga. Pambuyo polandira zizindikiro za echo kuchokera ku sensa, wolamulira amayendetsa deta, motero amawerengera mtunda pakati pa thupi la galimoto ndi zopinga ndikuweruza malo a zopinga.
Kubwerera radar dera zikuchokera chipika chithunzi monga momwe chithunzi 3, MCU (MicroprocessorControlUint) mwa ndandanda dongosolo kamangidwe, kulamulira lolingana pakompyuta analogi lophimba pagalimoto kufala dera, akupanga masensa ntchito. Akupanga ma echo siginecha amakonzedwa ndi kulandira mwapadera, kusefa ndi kukulitsa mabwalo, kenako kuzindikiridwa ndi madoko 10 a MCU. Polandira chizindikiro cha gawo lonse la sensa, dongosolo amapeza mtunda wapafupi kudzera aligorivimu yeniyeni, ndi amayendetsa buzzer kapena kusonyeza dera kukumbutsa dalaivala wa chapafupi chopinga mtunda ndi azimuth.
Ntchito yayikulu yosinthira radar ndikuthandizira kuyimitsa magalimoto, kutuluka m'mbuyo kapena kusiya kugwira ntchito pomwe liwiro la wachibale likupitilira liwiro linalake (nthawi zambiri 5km / h).
[Tip] Ultrasonic wave imatanthawuza mafunde a phokoso omwe amaposa kuchuluka kwa kumva kwa anthu (pamwamba pa 20kHz). Ili ndi mawonekedwe afupipafupi, kufalikira kwa mzere wowongoka, kuwongolera bwino, kusokoneza pang'ono, kulowa mwamphamvu, kuthamanga kwapang'onopang'ono (pafupifupi 340m / s) ndi zina zotero. Mafunde akupanga amayenda m'zinthu zolimba zosawoneka bwino ndipo amatha kulowa mpaka makumi a mita. Pamene akupanga akukumana ndi zonyansa kapena zolumikizira, zidzatulutsa mafunde owoneka bwino, omwe angagwiritsidwe ntchito kupanga kuzindikira mozama kapena kusiyanasiyana, motero amatha kupangidwa kukhala njira yoyambira.
