Nnansa yi ara woayɛ foforo akɔ nnɛyi dijitaal display te sɛ Garmin, Murphy, anaa custom Human-Machine Interface (HMI) so. Wohwɛ kwan sɛ engine telemetry a emu da hɔ te sɛ crystal ne data akenkan a ɛyɛ pɛpɛɛpɛ. Sɛ́ anka pɛtro kyerɛwtohɔ no bɛkenkan a emu da hɔ no, ɛhyerɛn mfomso bi, ɛkenkan zero, anaasɛ ɛda so ara yɛ nea hwee nni mu koraa. Saa tebea a ɛyɛ abasamtu yi ma adwumayɛ gyae ntɛm ara na ɛma wɔn a wɔyɛ adwuma no ani fura koraa wɔ pɛtro a wɔde asie no ho.
Wɔ SAE J1939 ne CAN bɔs ntam nkitahodi mu no, pɛtro dodow a ɛyera ntaa nyɛ screen a abubu. Ɛkame ayɛ sɛ bere nyinaa ɛyɛ huammɔdi wɔ hardware nkitahodi mu, protocol a ɛnhyia, anaasɛ analog-to-digital nkyerɛase mfomso. Nnɛyi dijitaal display ahorow hwɛ kwan sɛ wɔbɛhyehyɛ data packet ahorow a wɔahyɛ ho mmara denneennen. Sɛ data packet no nni hɔ, asɛe, anaasɛ wɔde mena ahoɔhare a ɛnteɛ a, gauge no ntumi nhyɛ mu ma kɛkɛ.
Saa akwankyerɛ yi bubu nea ɛde J1939 pɛtro sɛnkyerɛnne bi a ɛyera ba no ntini mu. Wobɛsua sɛdeɛ wobɛyi mfomsoɔ a ɛwɔ honam fam wiring ne data link layers no ntam. Bio nso, yɛkyerɛ gyinapɛn a ɛyɛ katee a wɔde paw sensor a ɛfata a wɔde besi ananmu anaa analog-to-CAN converter. Wubetumi de saa nhumu yi adi dwuma de asan de network no agyina pintinn ntɛmntɛm.
Nneɛma Titiriw a Wɔde Kɔ
J1939 pɛtro dodow a ɛnkyerɛ wɔ ɔyɛkyerɛ no so no taa fi termination resistors a enni hɔ, baud rates a ɛnhyia (250k vs. 500k), anaasɛ PGN 65276 (SPN 96) a entumi nkɔbɔ amanneɛ.
Engine dedaw bi a wɔbɛma ayɛ foforo akɔ dijitaal HMI so no hwehwɛ sɛ wɔde analog-to-CAN converter soronko bi si hɔ sɛ wɔkora mfitiase resistive sender no so a.
Sɛ woresusuw SAE J1939 tank level sender foforo ho a, fa unit ahorow a ɛwɔ fibea address a wotumi hyehyɛ ne IP67+ ratings a ɛyɛ den ma mmeae a ɛyɛ den no di kan.
Saa asɛm yi a wosiesie no wɔ nhyehyɛe kwan so no siw dijitaal mfiri a ɛyɛ adwuma koraa a wɔde besi ananmu a ɛho nhia ano.
Adwumayɛ ho ka a wɔbɔ wɔ J1939 Fuel Level a Ɛnkyerɛ
Lɔre ahorow a emu yɛ duru, po so ahyɛn, ne mfiridwuma mu anyinam ahoɔden mfiri de wɔn ho to telemetry data a ɛyɛ pɛpɛɛpɛ so kɛse. Adwumayɛ a wonni pɛtro ho nsɛm a edi mu no de adwumayɛ mu asiane kɛse ba wɔ saa nnwuma yi nyinaa mu. Wohyia pɛtro a ɛtɔ a ɛyɛ hu wɔ mmeae a ɛwɔ akyirikyiri ne bere a wonhwɛ kwan sɛ wogyae adwuma bere a woreyɛ adwuma a ɛho hia no. Diesel engine ahorow no yɛ nea ɛyɛ mmerɛw sɛ pɛtro kɔm de wɔn titiriw. Sɛ wɔde diesel tank kɛse bi di dwuma ma ɛyɛ nwunu koraa a, ɛtaa ma nhyehyɛe no mframa-toto a emu yɛ den ba wɔ injection system no mu. Mogya a wɔde bɛtwe pɛtro nhama a nhyɛso kɛse wom no hwehwɛ sɛ mfiri de wɔn ho gye mu kɛse, na ɛhyɛ agyapade no ma ɛnyɛ Intanɛt so nnɔnhwerew pii.
Mpɛn pii no, wɔn a wɔde di dwuma no de wɔn nsateaa kyerɛ dijitaal display a ne bo yɛ den no bere a gauge ahorow no adi nkogu no. Wodi mfomso de asodi to HMI screen a ɛyɛ nwonwa no so bere a huammɔdi ankasa no da so ara wɔ wiring no mu tɔnn no. Mpɛn pii no, wubehu sɛ wiring harness mfomso ketewaa bi na ɛde nhama no twae. Network node a wɔanhyehyɛ no yiye anaa pin a asɛe nso betumi ama screen a ɛnyɛ hwee koro no ara pɛpɛɛpɛ. Sɛ wɔde asodi to screen no so a, ɛde nhwehwɛmu a wɔsɛe no ba sɛnea wɔhwehwɛ yare no mu na ɛma adwumayɛfo a wosiesie nneɛma no nya abasamtu a enni awiei.
Nsiesiei a edi mu de pɛtro ho nsɛm a ɛkɔ so na ɛyɛ pintinn a wɔbɔ wɔ bɔs no nyinaa mu si hɔ. Ɛsɛ sɛ network no de data kɔ identifier a ɛteɛ no so a ɛntwentwɛn ne nan ase. Ɛsɛ sɛ wuhu network collisions biara koraa wɔ wo diagnostic tools no so. Ɛsɛ sɛ nhyehyɛe no yi mfomso biara a ɛba bere nyinaa a wɔde twa nkitahodi anaasɛ bere a wɔde twam no fi hɔ koraa. Eyi a wobenya no ma wotumi de wɔn ho to adwumayɛ so kɛse na ɛma adwumayɛfo no san nya ahotoso wɔ wɔn dijitaal gauge ahorow no mu.
Physical Layer vs. Data Link: Nhwehwɛmu a ɛfa Nkitahodi a Wɔatwa Mu no ho
Diagnosing nea enti a wowɔ a J1939 pɛtro dodow a ɛnkyerɛ no hwehwɛ sɛ wɔkyekyɛ ntam no mu abien a ɛsono emu biara. Ɛsɛ sɛ wohwehwɛ honam fam wiring hardware ne digital protocol software no mu wɔ ɔkwan soronko so. Saa ɔhaw ahorow ano aduru yi a wɔde frafra no sɛe bere a ɛsom bo a wɔde hwehwɛ yare no mu.
Nneɛma a Wɔde Tew Nneɛma Ho (Wiring ne Hardware) .
Honam fam ade no de anyinam ahoɔden a ɛnyɛ den no kɔ controllers ntam. Sɛ saa fapem yi di nkogu a, dijitaal data biara ntumi nkɔ display unit no so.
Termination Resistors: CAN networks hwehwɛ katee 120-ohm resistors wɔ akyi dompe titiriw no awiei abien no nyinaa. Resistors a ɛyera ma signal reflection a emu yɛ den wɔ wiring no ho. Saa adwene yi scrables data packets na ɛtow petrol data no koraa. Bere nyinaa fa dijitaal multimeter susuw resistance wɔ CAN High ne CAN Low nyinaa. Ɛsɛ sɛ ɛkenkan bɛyɛ ohms 60 bere a wɔahyɛ nhyehyɛe no mu ahoɔden no.
Harness Integrity: Hwɛ wiring routing no yiye wɔ chassis anaa hull no so. Hwɛ sɛ CAN High anaa CAN Low nhama a wɔabɔ no abɛn wɔ bulkheads ho anaa. Ɛsɛ sɛ wo nso wohwɛ sɛ asase so nkitahodi atitiriw no wɔ sensor ti no so. Asase a ayɛ basaa ma anyinam ahoɔden a ɛyɛ den no yɛ offsets. Saa offsets yi mma transceiver chip no ntumi nkenkan differential signals yiye.
Connector Corrosion: Hwɛ sɛ connectors no wɔ green oxidation anaa. Nsu a ɛkɔ plug no mu no sɛe CAN voltages a ɛyɛ mmerɛw no. Hohoro pin ahorow no ho yiye na fa dielectric grease gu so na amma nsu ankɔ soro daakye.
Protocol Layer (Data ne Software) no a Wɔtew Wɔn Ho .
Sɛ wiring sɔhwɛ ahorow no yɛ pɛpɛɛpɛ a, mpɛn pii no asɛm no sie wɔ data layer no mu. Software nhyehyɛe a ɛnteɛ abu so yiye wɔ bere a wɔreyɛ mfiri a wɔde di gua akyi no.
Baud Rate Mismatches: Ɛsɛ sɛ network nodes kasa wɔ ahoɔhare koro no ara mu pɛpɛɛpɛ. Sɛ wo engine network titiriw no yɛ adwuma wɔ 500 kbps, nanso sensor a wɔde besi ananmu no bɔ amanneɛ wɔ 250 kbps a, nkitahodi no di nkogu amonom hɔ ara. Display no ntumi nkyekyɛ data packets a ɛyɛ brɛoo no mu. Wobɛhunu screens a ɛda hɔ kwa anaa nkitahodiɛ timeout mfomsoɔ a emu yɛ den wɔ dash no so.
PGN ne SPN Verification: Standard industry identifier ma Dash Display fuel level ne Parameter Group Number (PGN) 65276. Saa nkrasɛm pɔtee yi de Suspect Parameter Number (SPN) 96 di dwuma. Wohia CAN analyzer adwinnade a wɔatu ho ama na ama woadi eyi ho adanse. Fa hyɛ diagnostic port no mu na hwɛ live traffic no. Sɛ PGN 65276 nni hɔ a, sensor no ntumi nsoma kɛkɛ.
FMS Gateway Filtering: Fleet applications taa de Fleet Management Standard (FMS) gateway module di dwuma. Saa apon yi tetew engine bɔs a ɛho hia no ne telematics amanneɛbɔ bɔs no ntam dwoodwoo. Hwɛ sɛ gateway no nnyɛ actively filtering fuel level PGN no ansa na adu dashboard display no so da.
Retrofit Asɛnnennen no: Analog Senders a Wɔde Bɛma Wɔakɔ Digitals Displays so
Diesel engine dedaw no de wɔn ho to mfiridwuma a ɛyɛ mmerɛw yiye a adi mfe du du pii so de susuw pɛtro. Wɔtaa de resistive analog senders a wɔasisi atwa sliding mechanical float ho ahyia na edi dwuma. Saa asomafoɔ yi output raw variable resistance ranges te sɛ Amerika gyinapɛn 240-33 ohms anaa Europa gyinapɛn 0-190 ohms. Nnɛyi J1939 displays te dijitaal packets a ɛyɛ nwonwa nkutoo ase. Wontumi nkenkan saa anyinam ahoɔden a ɛko tia raw yi tẽẽ, na ɛde hardware a ɛne ne ho nhyia titiriw ba.
Ano aduru Ɔfã: Analog-to-CAN Converters
Ebia worempɛ sɛ wobɛma nsu afi mfiridwuma mu tank kɛse bi mu ntɛm ara. Wubetumi apaw sɛ wubegyaw analog unit a ɛwɔ hɔ dedaw no wɔ nea ɛwɔ hɔ dedaw no mu koraa. Analog-to-J1939 gateway betumi ayɛ digitize analog signal a ɛwɔ hɔ dedaw no. Saa module ketewa a ɛwɔ inline yi yɛ adwuma sɛ nsɛm asekyerɛfo nyansafo wɔ nea ɔde kɔma dedaw no ne dijitaal ɔyɛkyerɛ foforo no ntam. Ɛkenkan resistance no na ɛdane no ma ɛyɛ CAN packet a ɛfata.
Nanso, ɛsɛ sɛ wohwɛ yiye kɛse bere a woreyɛ adetɔ no. Kwati converters a ne bo nyɛ den a wonni ahyɛnsode a efi generic intanɛt so gua so. Mpɛn pii no, wɔde hardcoded source address ahorow a wuntumi nsakra no kyerɛ. Saa address ahorow a wɔakyerɛw no den yi taa ne Engine Control Units (ECUs) anaa transmission controllers a ɛwɔ hɔ dedaw no bɔ abira. Saa address ntawntawdi yi ma network no bɔ ntɛm ara, na ɛbɔ nhyehyɛe a ɛho hia no gu offline.
Ano aduru Ɔfã: Digitals a Wɔde Si ananmu Tẽẽ
Ɔkwan a ɛho tew na wotumi de ho to so sen biara a wɔfa so siesie nneɛma no hwehwɛ sɛ wɔsesa hardware nyinaa. Woyi dedaw a mfiri a ɛko tia ade no fi tank no mu koraa. Afei wobɛhyehyɛ native, solid-state CAN bɔs mu pɛtro dodow sensor . Saa upgrade yi yi mfinimfini converter adaka no fi hɔ koraa. Unit foforo no bɔ dijitaal packets tẽẽ kɔ akyi dompe titiriw no so. Bere a ɛhwehwɛ sɛ wɔde honam fam tank kɔ mu na wɔde ahyɛ mu no, ɛma network no nyinaa ahotoso ne data a ɛyɛ pɛpɛɛpɛ tu mpɔn kɛse.
Nhwehwɛmu a Wɔreyɛ Asesa SAE J1939 Tank Level Sender
Sɛ wo diagnostics kyerɛ sensor a awu daa a, ɛsɛ sɛ wopaw unit a wode besi ananmu no yiye. Ɛnyɛ obiara SAE J1939 tank level sender yɛ adwuma yiye saa ara wɔ mmeae a emu yɛ den na ɛwosow.
Mfiridwuma a Wɔde Susuw Nneɛma
Adetɔfo taa paw nnɛyi capacitive nhyehyɛe ne atetesɛm demmire switch mfonini ahorow. Capacitive sensors ma akenkan a ɛkɔ so, a ɛyɛ fɛ yiye denam dielectric nsakrae a ɛba nsu no ankasa mu a wɔsusuw so. Saa software a ɛwɔ mu yi yi basabasayɛ anammɔntu nkɛntɛnso a wuhu sɛ pɛtro sloshes bere a aggressive transit no fi hɔ. Wɔkorɔn koraa ma CAN bɔs a wɔde ka bom a ɛyɛ pɛpɛɛpɛ kɛse. Reed switch ahorow de wɔn ho to honam fam magnetic float a ɛtwetwe fa circuit board so so. Wɔyɛ akenkan no foforo bere a float no twa magnetic ntam pɔtee bi honam fam nkutoo.
Nsiesiei mu Nsakrae (Ɛho hia ma BOF Gyinaesi ahorow) .
Wohia nhyehyeɛ mu nsakraeɛ kɛseɛ berɛ a wode hardware foforɔ reka ecosystem a ɛwɔ hɔ dada ho. Address a wɔkyerɛ no ho hia kɛse ma adwumayɛ a ɛfata a mfomso biara nni ho. Bisa wo ho nsɛm kakraa bi a ɛho hia kɛse ansa na woatɔ. So wubetumi de nhyehyɛe adwinnade a wɔahyɛ da ayɛ no asesa sensor no Source Address no ntɛm? So wubetumi ayɛ tank no mu nsɛm no ho nhwehwɛmu ama tank no nsusuwii a ɛnyɛ pɛpɛɛpɛ anaasɛ wɔayɛ no sɛnea wopɛ? Po so tank a V-hull ne saddle tank a ɛwɔ anammɔn a emu yɛ duru hwehwɛ sɛ wɔyɛ volumetric map a wɔahyɛ da ayɛ. Sɛ sensor no nni programming tumi a, ebia ɛbɛbɔ tank a ɛyɛ fã ma ho amanneɛ wɔ ɔkwan a ɛnteɛ so esiane tank no geometry a ɛyɛ nwonwa nti.
Gyinapɛn a Ɛma Ɛkyɛ ne Nea Wodi So
Awiei koraa no, nneɛma a atwa yɛn ho ahyia a wɔde siw ano no na ɛkyerɛ po so ne nneɛma a wɔde hu nneɛma a emu yɛ duru no nkwa nna. Hwehwɛ sɛnea wodi SAE J1939 gyinapɛn no so pɔtee, a wɔakyerɛw ho asɛm. Wopɛ nso sɛ wonya CE ne RoHS adansedi a ɛyɛ gyinapɛn de hwɛ hu sɛ anyinam ahoɔden ahobammɔ. Hwɛ yiye titiriw wɔ aban Ingress Protection ratings a ɛwɔ spec krataa no so. Wo hia IP67 anaa IP68 nneɛma a atwa yɛn ho ahyia a wɔde bɛbɔ emu circuitry no ho ban koraa. Nsu a ɛkɔ mu da so ara yɛ ade titiriw a ɛde sensor wuwu ntɛm wɔ afuw mu ba koraa.
Adwumayɛ Ntotoho a ɛfa Fuel Sender Technologies ho
Feature Category a Wɔde Di Dwuma
Capacitive J1939 Nneɛma a Wɔde Hwɛ Nneɛma
Reed Switch Nsakraeɛ Nsakraeɛ
Data Ho Nsiesiei
Kɔ so, sub-millimeter tracking pɛpɛɛpɛ
Stepped (ɛtaa huruw wɔ 10mm kosi 20mm ntam) .
Slosh a Wɔde Di Dwuma
Ɛyɛ papa (Ɔde software averaging algorithms di dwuma) .
Poor (Physical float de nsu tu ntɛmntɛm) .
Afã horow a Ɛtu
Biara nni hɔ (Solid-state concentric tube nhyehyɛe) .
Yiw (Afiri a ɛwɔ abɔnten a ɛtwetwe nsuo) .
Amanneɛbɔ Tank Profiling
Wotumi yɛ nhyehyɛe kɛse denam CAN nnwinnade so
Mpɛn pii no, wɔde anohyeto katee wɔ linear resistance output so
Wosow a Ɛko Tia
Superior (Mfiri a wɔde di nkitaho biara nni mu) .
Moderate (Nkitahodi betumi asɛe bere kɔ so) .
Nokwasɛm a Wɔde Di Dwuma ne Anamɔn a Edi Hɔ
Sɛ wodi nneɛma a ntease wom na wɔahyehyɛ no nnidiso nnidiso akyi a, ɛmma obi nnya abasamtu nnɔnhwerew a wontumi nkan. Fa saa nhwehwɛmu anammɔn pɛpɛɛpɛ yi di dwuma na san de wo display dwumadi no ba wɔ nhyehyɛe kwan so.
Hwɛ CAN Bus Traffic: Ansa na wobɛtɔ hardware foforo biara no, fa J1939 code reader hyɛ diagnostic port titiriw no mu. Wubetumi nso de USB CAN sniffer a ɛyɛ gyinapɛn adi dwuma wɔ laptop so. Hwɛ SPN 96 pɔtee wɔ data asuten no mu. Sɛ ɛwɔ bɔs no mu a, sensor no yɛ adwuma pɛpɛɛpɛ. Wɔahyehyɛ display no wɔ ɔkwan a ɛnteɛ so kɛkɛ na ehia sɛ wɔyɛ software update. Sɛ packet no yera koraa a, sensor anaa wiring no adi nkogu.
Verify Network Architecture: Hwɛ sɛ woahyɛ no foforo J1939 fuel level sensor nokwarem no, ɛka akyi dompe a ɛteɛ no ho. Wɔn a wɔyɛ adwuma no pii de nhama kɔ bɔs a ɛto so abien a ɛyɛ wɔn de mu wɔ akwanhyia mu. Eyi yɛ mfomso a ɛtaa ba wɔ po so NMEA 2000 ne J1939 afrafra nhyehyɛe ahorow a ɛyɛ den mu. Ɔyɛkyerɛ no ntumi nsiw ɔkwan a ɛda ntam no ano a enni bridge apon a wɔahyira so.
Hwɛ Terminating Resistance: Dum battery ahoɔden a ɛwɔ system no mu nyinaa. Fa multimeter hwehwɛ CAN High ne CAN Low pin ahorow no mu. Hwɛ hu sɛ wubehu ohms 60. Sɛ wuhu 120 ohms a, woreyera terminating resistor wɔ bɔs no ano biako. Sɛ wuhu 40 ohms anaa nea ennu saa a, wowɔ resistors pii dodo.
Shortlist a Solution: Hwɛ sɛnea wubetumi akɔ tank no mu yiye. Sɛ ɛnyɛ den sɛ wobɛkɔ tank no mu afi soro a, tɔ native J1939 capacitive liquid level sensor. Saa kwan yi ma wotumi de ho to so kɛse bere tenten. Sɛ wɔatoto tank no mu koraa anaasɛ wontumi nkɔ fam wɔ fam a emu yɛ duru ase a, tɔ analog-to-J1939 signal converter a ɛyɛ papa a wotumi yɛ ho nhyehyɛe mmom.
Awie
Telemetry data a ɛho hia a wɔbɛsan de aba no hwehwɛ sɛ wɔfa ɔkwan a wɔahyehyɛ so de hwehwɛ yare mu sen sɛ wɔbɛsesa ne fã bi a wɔanhyɛ da. Ɛsɛ sɛ wohwɛ honam fam nkitahodi ne protocol nhyehyeɛ ansa na woaka honam fam tank hardware no. Sɛ wuhyia analog incompatibilities a, paw programmable gateways a ɛkorɔn de bɔ network integrity ho ban. Sɛ wopɛ sɛ wode si ananmu koraa a, fa solid-state capacitive technology di kan na ama woanya amanneɛbɔ a ɛyɛ pɛpɛɛpɛ a ɛsen biara. Bere nyinaa si wo network baud rates ne source address ahorow no so dua wɔ instɔlehyɛn fã a etwa to no mu. Akwankyerɛ pɔtee yi a wubedi akyi no hwɛ hu sɛ wo dijitaal display ahorow no de adwumayɛ ho nsɛm a ɛyɛ nokware a wontwa mu ma bere tenten.
FAQ
Q: PGN bɛn na wɔde di dwuma ma J1939 pɛtro dodow?
A: Fuel level data taa bɔ amanneɛ wɔ Parameter Group Number (PGN) 65276. Saa PGN pɔtee yi ne standard Dash Display dwumadie no hyia. Wɔ saa nkrasɛm packet pɔtee yi mu no, ntwamutam no de Suspect Parameter Number (SPN) 96 di dwuma de gyina hɔ ma Fuel Level 1 pɛpɛɛpɛ.
Asɛmmisa: So metumi de analog petrol sender akɔ J1939 display so tẽẽ?
A: Dabi, wuntumi mfa wɔn nkɔka wɔn ho tẽẽ. Nnɛyi J1939 displays nkutoo na ɛyɛ adwuma dijitaal CAN nkrasɛm. Analog senders output nsakrae anyinam ahoɔden resistance te sɛ 240-33 ohms. Ɛsɛ sɛ wode analog-to-CAN gateway soronko bi si hɔ. Saa converter yi kyerɛ anyinam ahoɔden a ɛko tia raw no ase kɔ dijitaal packets a wɔahyehyɛ no yiye mu.
Asɛmmisa: Dɛn nti na me pɛtro dodow kɔ fam bere ne bere mu kodu zero wɔ dijitaal dash no so?
A: Mpɛn pii no, nsu a ɛtɔ bere ne bere mu no kyerɛ honam fam layer nsɛm mmom sen sɛ ɛbɛkyerɛ sensor ahorow a awu koraa. Ɛsɛ sɛ wodi kan hwɛ sɛ 120-ohm termination resistors ayera wɔ CAN akyi berɛmo no so. Afei, hwɛ harness titiriw no mu sɛ CAN High anaa CAN Low wiring nkitahodi ahorow no ayɛ mmerɛw anaa. Awiei koraa no, hwɛ sɛ asase nkitahodi no wɔ sensor ti no so.
Q: So mehia 250k anaa 500k baud rate sensor?
A: Egyina wo kar anaa po so ahyɛn pɔtee no ntam nkitahodi nhyehyɛe so koraa. J1939 ntam nkitahodi a emu yɛ duru a ɛyɛ agyapade dodow no ara yɛ adwuma wɔ 250 kbps. Nanso, ɛlɛtrɔnik nhyehyɛe foforo taa tu kɔ ahoɔhare a ɛyɛ 500 kbps a ɛyɛ ntɛmntɛm so. Ɛsɛ sɛ wode sensor foforo no baud rate ne wo network a ɛwɔ hɔ dedaw no hyia pɛpɛɛpɛ na amma nkitahodi a entumi nyɛ adwuma yiye.
Ɔdebɔneyɛfo a wɔagye din sen biara ne nea ɔyɛ level-sensor ne float-switch
