Dɛn ne data nkitahodi nhyehyɛe?
betumi abɔ bɔs ho nkitahodi .
Controller Area Network (CAN) bɔs no yɛ serial communication protocol bɔs a wɔayɛ ama ankasa-bere aplikeshɔn. Ebetumi de nsɛnkyerɛnne akɔ twisted pair, coaxial cable, anaa optical fiber so. Esiane sɛ ɛyɛ adwuma yiye, ahotoso a ɛkorɔn, ne ankasa-bere su ahorow a ɛkyɛn so nti, ebetumi abɛyɛ afuw mu buses a wɔagye atom kɛse wɔ wiase nyinaa no mu biako.
Mprempren, CAN nkitahodi ne nkitahodi kwan titiriw a wɔfa so yɛ batere sohwɛ nhyehyɛe (BMS). Wɔkamfo kyerɛ denneennen na wɔde di dwuma kɛse wɔ ɔman no mu ne amanaman ntam anyinam ahoɔden kar batere ho nhyehyɛe a wɔahyɛ da ayɛ mu, ne BMS data nkitahodi gyinapɛn ahorow a ɛfa ho wɔ China ne amannɔne nyinaa. Wɔde bɔs protocol afoforo te sɛ RS232 ne RS485 nso di dwuma wɔ battery management systems mu nkitahodi ahorow bi mu.
Flexray Nkitahodi .
Bere a kar ɛlɛtrɔnik mfiridwuma anya nkɔso no, atetesɛm CAN ano aduru nyɛ nea eye sen biara bio a wobetumi de adi kar nkitahodi ho nsɛnnennen ho dwuma. Wɔ September 2000 mu no, BMW ne Daimlerchrysler, ne Philips ne Motorola yɛɛ adwuma, hyehyɛɛ Flexray Consortium sɛ wɔbɛyɛ nkitahodi nhyehyɛe foforo na wɔahyɛ ho nkuran sɛ gyinapɛn protocol a wɔde yɛ powertrain a ɛkɔ anim, chassis, ne x{2}}denam{3}}wire nhyehyɛe ahorow so.
Flexray de nneɛma pii a ɛkɔ anim a atetesɛm wɔ-kar nkitahodi protocols (te sɛ can) nni, a nea ɛka ho ne:
(1) Nneɛma a wɔde mena a ɛkɔ soro .Flexray channel biara ma bandwidth a ɛyɛ 10 mbit/s. Flexray betumi ayɛ adwuma sɛ biako-channel nhyehyɛe (ɛte sɛ can anaa lin networks) anaasɛ sɛ abien-channel nhyehyɛe, a ɛyɛ nea ɛsen biara transmission rate a ɛyɛ 20 Mbit / S-20 mpɛn pii sen maximum adwumayɛ ahoɔhare a mprempren can networks.
(2) synchronized bere nnyinaso .Ɔkwan a wɔfa so nya kwan a wɔde di dwuma wɔ Flexray mu no gyina wiase nyinaa bere a wɔde yɛ adwuma a ɛne ne ho hyia so. Saa bere yi nnyinaso no yɛ nea protocol no de si hɔ ankasa na ɛne no yɛ pɛ na wɔma ɛyɛ adwuma ma application layer no. Bere nnyinaso no pɛpɛɛpɛyɛ no yɛ 0.5 μs ne 10 μs (mpɛn pii no 1–2 μs).
(3) Nkitahodi a wɔde gyina hɔ ma .Nkitahodi wɔ Flexray mu no ba wɔ nkitahodi kyinhyia a ɛkɔ so mpɛn pii no mu, baabi a wɔde nkrasɛm pɔtee bi ma gyinabea ahorow a ɛwɔ hɔ daa (slots) wɔ kyinhyia no mu. Ne saa nti, nea ogye no di kan nim bere a nkrasɛm bi bɛba no pɛpɛɛpɛ. Bere mu deviation a ɛfa bere a wɔde ba no ho no sua koraa na ɛyɛ nea wɔahyɛ ho bɔ.
(4) Mfomso a ɛkorɔn a wotumi gyina ano .Mfomsoɔ a ɛyɛ den a wɔhunu ne mfomsoɔ-Adwumayɛ a ɛtumi gyina ano yɛ nsusuiɛ titire a wɔsusu ho wɔ Flexray mu.
- Flexray bɔs no de cyclic redundancy check (CRC) di dwuma de hu nkitahodi mu mfomso ahorow.
- Ɛnam dual-kwan so nkitahodi so no, Flexray de redundancy ma.
- Ɛdenam Star topology (anaasɛ topologies a wɔaka abom) a wɔde bedi dwuma so no, Flexray betumi adi mfomso-abodwokyɛre ahwehwɛde ahorow ho dwuma koraa, a nea ɛka ho ne biako-point-a ɛwɔ-adi nkogu no mu.
(5) Nsakrae a ɛba .Na nsakraeɛ yɛ adeɛ titire a wɔde wɔn adwene si so wɔ Flexray Protocol no nkɔsoɔ mu na ɛda adi wɔ afã a ɛdidi soɔ yi mu: 1 boa nkitahodiɛ torpologies dodoɔ (Bus, Star, Hybrid, ne nea ɛkeka ho); 2 Nkrasɛm tenten a wotumi hyehyɛ: Wobetumi ayɛ data payload tenten no sɛnea ɛbɛyɛ a ɛne ahwehwɛde pɔtee a ɛwɔ control application no mu no hyia; 3 Sɛ wode dual-channel topology redi dwuma a, wobetumi de akwan abien no adi dwuma de ama bandwidth akɔ soro anaasɛ wode nkrasɛm a ɛho nhia bɛma; 4 Wobetumi asiesie bere tenten a static ne dynamic segments no di wɔ nkitahodi kyinhyia bi mu no sɛnea application ahiade pɔtee te.
Mfiridwuma mu Ethernet .
Industrial Ethernet yɛ digyital ntam nkitahodi a ɛbue koraa. Mfiri a efi wɔn a wɔyɛ nneɛma ahorow mu no betumi anya nkitahodi a ɛyɛ mmerɛw denam nkitahodi nhyehyɛe a wɔde di dwuma wɔ ɔkwan a ɛfata so a wobedi so no so. Ɛde nkitahodi dodow a ɛkorɔn ma: Fast Ethernet a ahoɔhare yɛ 10 Mbit/s ne 100 Mbit/s agye atom kɛse, Gigabit Ethernet mfiridwuma no anyin, na 10 Gbit/s Ethernet reyɛ nhwehwɛmu ne nkɔso a ɛyɛ nnam. Saa dodow yi dɔɔso kɛse sen mprempren fieldbuses de no.
Nanso, Industrial Ethernet da so ara hyia nsɛnnennen pii, a nea ɛka ho ne:
- Real-bere adwumayɛ .
- Adapability ne ahotoso wɔ mfiridwuma mu tebea horow a emu yɛ den mu .
- Application a ɛwɔ hɔ-layer protocols a ɛfata ma mfiridwuma mu automation control .
Esiane sɛ mfiridwuma mu Ethernet mfiridwuma anya nkɔso a ɛkɔ so nti, wɔresiesie nsɛm a ɛwɔ atifi hɔ no nkakrankakra.
