SISTEM DE ALIMENTARE LPG 15–1
CAPITOLUL 15
SISTEM DE ALIMENTARE LPG ............. ......................... ......................... ......................... ......................... .......................... ......................... ......................... ...................... .........15 15 – 2 DESCRIERE GENERALÃ .......................... LOCALIZARE COMPONENTE (MODEL SOHC) .................. .................................. ................................. ................................. ............................... ...............15 15 – 2 LOCALIZARE COMPONENTE (MODEL DOHC) DOHC) ....................... ....................................... ................................. ................................. ..........................15 ..........15 – 3
PÃRÞI COMPONENTE ..................... ................................ ...................... ...................... ..................... ..................... ...................... ...................... ..................... ..................... .................... ......... 15 – REZERVOR GAZ ............................. .............. ............................... ............................... .............................. ............................... ............................... .............................. ......................... .......... 15 – BUªON ALIMENTARE .............................. .............. ............................... ............................... ............................... ............................... ............................... ............................... ................ 15 – MULTISUPAPÃ ........................................ .................. ........................................... .......................................... .......................................... ........................................... ................................ .......... 15 – CARCASÃ MULTISUPAPÃ ............................. ............. ............................... .............................. ............................... ............................... .............................. .......................... ........... 15 – ELECTROVALVÃ LPG .............................. ............... .............................. .............................. .............................. .............................. .............................. .............................. .................. ... 15 – REDUCÃTOR/VAPORIZATOR ....................................... ................... ........................................ ........................................ ........................................ ................................ ............15 15 – DISPOZITIV DE DOZAJ AL GAZULUI GAZULUI ......................................... ............................................................... ........................................... .................................. ............. 15 – MIXER .................................... ................. ...................................... ...................................... ...................................... ...................................... ...................................... ..................................... .................. 15 – CONDUCTE ªI FURTUNE DE ALIMENTARE .......................................................................... .................................................................................... .......... 15 – CONECTORI TIP „T” ........................ .................................... ........................ ........................ ........................ ......................... ......................... ........................ ........................ ............... ... 15 –
4 4 4 5 5 6 6 7 7 7 9
DESCRIERE ªI FUNCÞIONARE ............................. ............................................ .............................. ............................... ............................... .............................. ......................15 .......15 – 10 REZERVOR ....................................... ................... ........................................ ........................................ ........................................ ........................................ ....................................... ....................... 15 – 10 MULTISUPAPÃ .......................................................................................................................................15 – 11 CARCASÃ MULTISUPAPÃ ....................................................................................................................15 – 13 ELECTROVALVÃ LPG ...........................................................................................................................15 – 14 REDUCÃTOR/VAPORIZATOR ...............................................................................................................15 – 15 MIXER .....................................................................................................................................................15 – 16 CONDUCTE DE ÎNALTÃ PRESIUNE ..................... .................................... .............................. .............................. .............................. ............................. .................. .... 15 – 16 COMUTATOR COMUTATOR 223 ................... ............................. .................... .................... .................... .................... .................... .................... .................... .................... .................... ................... ........... 15 – 16 REGLAJUL LA RELANTI RELANTI AL VAPORIZATORULUI ........................................................................ ............................................................................ .... 15 – 21 .......................................... ............................. ............................. ............................. ............................. ............................. ...................15 .....15 – 22 CUPLURI DE STRÂNGERE ...........................
DIAGRAME DE DEFECT ........................... ......................................... ............................ ........................... ........................... ............................ ............................ ........................... ............. 15 – 24 SCHEME ELECTRICE ..................... ................................ ...................... ..................... ..................... ...................... ...................... ...................... ...................... ..................... .................... ..........15 15 – 28 CONECTORII ªI LOCALIZAREA PUNERILOR LA MASÃ ................................................. .................................................................. ................. 15 – 28 AER CONDIÞIONAT, VENTILATOR VENTILATOR ELECTRIC, MOTOR VENTILAÞIE VENTILAÞIE CLIMATIZARE.....................15 CLIMATIZARE.....................15 – 31 INJECTOR, VSS, CTS, MAP, TPS, MAT, COMUTATOR CIFRÃ OCTANICÃ, SENZOR OXIGEN, VALVA VALVA IAC, MASA ECM, ALIMENTARE ECM ................................................... 15 – 32 CONTACT CHEIE, ELECTROMOTOR ELECTROMOTOR PORNIRE, PORNIRE, ALTERNATOR, CIRCUIT DE APRINDERE APRINDERE ....... 15 – 33 MARTOR „REPARARE URGENTÃ MOTOR”, ELECTROVALVÃ TCC, POMPÃ BENZINÃ, ALDL, COMUTATOR COMUTATOR P/N............... P/N......................... .................... .................... .................... .................... ................... ................... .................... .................... .................... ............... ..... 15 – 34 CABLAJ TABLOU DE BORD.................. BORD.............................. ....................... ....................... ....................... ....................... ........................ ....................... ....................... ............... ...15 15 – 35
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15–2 SISTEM DE ALIMENTARE LPG
DESCRIERE GENERALÃ LOCALIZARE COMPONENTE (MODEL SOHC) SOHC) 1
2
3
21 20
4 5
19
6 7
18 17
8
16 15 14
9
1. Conductã legãturã rezervor-electrovalvã LPG 2. Electrovalvã LPG 3. Furtun legãturã mixer 4. Colier 5. Reducþie mixer 6. Mixer
10
11 12 13
12. Furtun încãlzire tur (2) 13. Furtun încãlzire retur (2) 14. Furtun încãlzire tur (3) 15. Furtun încãlzire retur(3) 16. Colier 17. Reducãtor/vaporizator
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SISTEM DE ALIMENTARE LPG 15–3
DESCRIERE GENERALÃ LOCALIZARE COMPONENTE (MODEL DOHC) 3
2
1
4 5 6 7 8 21 20 19 18 17 16 15 14 13 12 11
9
10
1. Conductã legãturã rezervor-electrovalvã LPG 2. Electrovalvã LPG 3. Furtun legãturã mixer 4. Colier 5. Conector 6. Furtun actuator-conector actuator-conector
12. Furtun încãlzire tur (2) 13. Furtun încãlzire tur (3) 14. Furtun încãlzire retur (2) 15. Colier 16. Conectori tip T 17. Furtun încãlzire tur (1)
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15–4 SISTEM DE ALIMENTARE LPG
PÃRÞI COMPONENTE Sistemul de alimentare cu LPG (Low Pressure Gas) de tip LOVATO are drept scop gestionarea corectã a funcþionãrii motoarelor autovehiculelor echipate cu catalizator ºi este compus din urmãtoarele pãrþi componente.
REZERVOR GAZ. Realizeazã stocarea gazului la presiune ridicatã.
bridã metalicã plastifiatã
traversã telescopicã
BUªON ALIMENTARE. Prin intermediul acestuia se realizeazã alimentarea cu gaz de la staþiile LPG. SECÞIUNE A - A capac
ºuruburi prindere
bilã A
A
reducþie
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SISTEM DE ALIMENTARE LPG 15–5
MULTISUPAPÃ. Este montatã pe rezervor ºi prin intermediul acesteia se realizeazã încãrcarea rezervorului ºi extragerea gazului necesar alimentãrii motorului. Deasemenea aceasta permite afiºarea gradului de umplere a rezervorului. la electrovalva LPG
corp multisupapã
indicator nivel umplere rezervor alimentare de la staþia LPG supapã manualã de închidere plutitor conductã
CARCASÃ MULTISUPAPÃ. Realizeazã etanºarea multisupapei împotriva scãpãrilor accidentale de gaz
capac SECÞIUNE A - A corp
A
A
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15–6 SISTEM DE ALIMENTARE LPG
ELECTROVALVÃ LPG. Realizeazã întreruperea debitului de gaz cãtre reducãtor/vaporizator atunci când motorul este oprit sau funcþioneazã pe benzinã.
bobinã
borne electrice
clemã prindere la reducãtor/vaporizator
de la rezervorul de gaz ºurub prindere
REDUCÃTOR/VAPORIZATOR. Realizeazã schimbarea fazelor gazului ºi anume trecerea din faza lichidã în fazã gazoasã (stare de vapori).
ºtuþ admisie apã caldã
bobinã
ºtuþ evacuare apã caldã ºurub reglaj relanti la mixer
de la electrovalva LPG ºurub drenaj
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SISTEM DE ALIMENTARE LPG 15–7
DISPOZITIV DE DOZAJ AL GAZULUI. Constã dintr-un actuator comandat electronic al cãrui obturator variazã secþiunea de trecere a gazului prin canalul actuatorului. Corectarea raportului aer/gaz pentru toate regimurile de funcþionare ale motorului se realizeazã pe baza semnalelor primite de cãtre modulul LOV ECO (de la sonda lambda, senzorul TPS, semnalul turaþiei de la modulul ECM) A motor pas cu pas
piston ecran vizualizare
A
MIXER. Realizeazã amestecul carburant aer-gaz.
duze gaz
CONDUCTE ªI FURTUNE DE ALIMENTARE. Conductã alimentare cu gaz buºon-rezervor.
de la actuator
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15–8 SISTEM DE ALIMENTARE LPG
Conductã alimentare cu rezervor-electrovalva LPG.
Conductã alimentare cu electrovalva LPG-vaporizator.
Furtune circuit încãlzire.
segment 2
tãieturã
segment 1
Furtun încãlzire (tur) (model SOHC)
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SISTEM DE ALIMENTARE LPG 15–9
Furtun încãlzire (retur) (model DOHC)
tãieturã reprezentare izometricã
segment 1 segment 2
Furtun încãlzire (retur) (model SOHC)
tãieturã
segment 1 segment 2 reprezentare izometricã
CONECTORI TIP „T”. Realizeazã conexiunile dintre furtunele sistemului de alimentare LPG.
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15–10 SISTEM DE ALIMENTARE LPG
DESCRIERE ªI FUNCÞIONARE REZERVOR Rezervorul este o componentã de bazã a sistemului LOVATO, deoarece acesta trebuie sã îndeplineascã anumite condiþii de securitate. În acest scop, construcþia acestuia este realizatã astfel încât sã reziste la presiuni ridicate de exploatare, datorate variaþiilor de temperaturã a mediului ambiant. Garanþia rezervorului de gaz este de 10 ani cu respectarea condiþiilor de exploatare. Este interzisã umplerea rezervorului la o valoare mai mare de 80% din capacitatea sa. Acest fapt este justificat de urmãtoarele valori ale presiunii din interiorul rezervorului la diferite temperaturi ale mediului ambiant. Grad de umplere – pânã la 80% Temperaturã exterioarã Procent fazã gazoasã Procent fazã lichidã Presiune
15° C 20 % 80 % 6,5 bar
Grad de umplere – mai mare de 80% Temperaturã exterioarã Procent fazã gazoasã Procent fazã lichidã Presiune
15° C 10 % 90 % 6,5 bar
38° C 14-16 % 86-84 % 12 bar
50° C 9-14 % 91-86 % 16,8 bar
50° C 100 % valoare periculoasã
Se observã cã la un grad de umplere mai mare de 80%, obþinut la o temperaturã exterioarã de 15° C, la creºterea temperaturii exterioare la valoarea valoare a de 38° C nu mai avem fazã gazoasã în rezervor, cea ce înseamnã cã s-a ajuns la o situaþie foarte periculoasã, deoarece gazul fiind deja lichefiat, presiunea din rezervor poate depãºi valoarea de 45 bar, fapt ce ar duce la deformarea ºi chiar distrugerea prin explozie a rezervorului. Dacã se observã deformaþii permanente ale rezervorului rezervo rului de gaz, scurgeri de gaz, înseamnã cã nu au fost respectate condiþiile de pãstrare ºi utilizare a rezervorului. Pentru buna pãstrare ºi utilizare a rezervorului, se vor evita ºocurile mecanice aplicate direct rezervorului (lovire cu corpuri solide), nu se va lucra cu foc deschis în jurul vehiculelor vehic ulelor echipate cu instalaþii de gaz decât dupã du pã ce în prealabil instalaþia a fost golitã în totalitate de gaz. Toate reparaþiile vor fi fãcute numai cu îndeplinirea condiþiilor tehnice specifice lucrului la instalaþia de gaz ºi în conformitate cu reglementãrile ISCIR. Rezervorul este montat în compartimentul de bagaje. Prinderea acestuia se face conform figurii urmãtoare.
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SISTEM DE ALIMENTARE LPG 15–11
MULTISUPAPÃ Multisupapa este astfel conceputã încât sã permitã umplerea rezervorului de la staþiile de alimentare LPG precum ºi extragerea gazului din rezervor necesar funcþionãrii motorului. O caracteristicã constructivã necesarã necesar ã securizãrii operaþiei de umplere a rezervorului este aceea de a stopa umplerea acestuia când nivelul de gaz din rezervor ajunge la valoarea de 80% din capacitatea sa totalã de stocare. Condiþia necesarã pentru respectarea acestei caracterisitici este poziþionarea corectã a rezervorului astfel încât multisupapa sã fie înclinatã la 30° faþã de orizontalã. Multisupapa este prevãzutã cu - o supapã manualã de închidere (1); - o supapã limitatoare de debit; - o supapã de blocare a umplerii la nivelul maxim admis (80% din capacitatea rezervorului); - o supapã de siguranþã (2); - un indicator al nivelului de umplere a rezervorului (3).
la electrovalva LPG 2 5 1 4
3 de la rezervor
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15–12 SISTEM DE ALIMENTARE LPG
1 1
5 7 6
17
15
14 13
16 Secþiunea C-C
Secþiunea B-B
12
12
D
8
9
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SISTEM DE ALIMENTARE LPG 15–13
Supapa manualã de închidere este prezentatã în secþiunea urmãtoare.
Secþiunea A-A
Supapa limitatoare de debit este comandatã de depãºirea peste o limitã stabilitã a debitului de umplere a rezervorului. Gazul în stare lichidã, care va încãrca rezervorul rezervo rul prin conducta (12), exercitã o forþã de apãsare apãs are asupra supapei (13) ºi tinde sã o împingã spre în jos. Aceastei forþe se opune forþa elasticã exercitate de arcul calibrat la întindere (14 ). Când presiunea de alimentare depãºeºte presiunea datoratã forþei elastice a arcului calibrat, supapa (13) se aºeazã pe scaunul ei ºi blocheazã imediat accesul gazului spre rezervor. Aceastã opþiun e constructivã a fost aleasã ca în cazul spargerii conductei de cupru cup ru (12), care ar duce la mãrirea debitului debitulu i de alimentare cu gaz, sã nu se depãºeascã valoarea valoa rea de 6l/minut. Supapa de blocare a umplerii este comandatã de cãtre ridicarea plutitorului ºi este compusã din supapa (15). Supapa de siguranþã este necesarã purjãrii gazului din rezervor dacã valoarea presiunii devine periculoasã. Multisupapa este fixatã în orificiul circular practicat în rezervor cu ajutorul ºuruburilor de fixare. Etanºarea este asiguratã de garnitura (16). Pe timpul montãrii multisupapei este interzis a se acþiona asupra tijei flotorului deoarece acest lucru ar avea efecte asupra funcþionãrii corecte a supapei de blocare a umplerii la limita de 80% din capacitatea rezervorului.
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15–14 SISTEM DE ALIMENTARE LPG
ELECTROVALVA LPG. Este o componentã comandatã electromagnetic care realizeazã oprirea alimentãrii cu gaz atunci când motorul este oprit sau funcþioneazã cu benzinã. Gazul în stare lichidã trece din rezervor în camera (A) din corpul (1) care este asamblat de corpul cor pul (2) cu ajutorul ºurubului (3). De aici, gazul traverseazã filtrul filtr ul (4), trece în camera (B) ºi apoi dupã ce traverseazã traverse azã canalul (C) ajunge în partea parte a superioarã a electrovalvei LPG. Pentru a trece în canalul (D) este nevoie de acþionarea supapei (5) cu ajutorul electromagnetului (6). Când contactul nu este pus sau comutatorul este pe poziþia „benzinã’’, „be nzinã’’, bobina electromagnetului electromagne tului (6) nu este parcursã de curent electric ºi deci nu este acþionatã supapa sup apa (5), care, sub acþiunea arcului ar cului (7) închide orificiul spre canalul canalu l (D). La punerea contactului sau când comutatorul este pe poziþia „gaz’’, bobina electromagnetului (6) este parcursã de curent electric ºi, sub acþiunea forþei electromagnetice, supapa (5) este atrasã spre polul superior (8) al electromagnetului eliberându-se astfel calea spre canalul (D). Electrovalva LPG este montatã cu ajutorul ajutoru l unei cleme de fixare în compartimentul motor, în poziþie verticalã cu camera de decantare în jos. Se va evita montarea electrovalvei în apropierea componentelor care se încãlzesc în timpul funcþionãrii motorului deoarece acest lucru poate duce la scãderea intensitãþii câmpului magnetic ºi deci la nealimentarea motorului cu gaz din cauza nedeplasãrii supapei (5).
8 7
6 5
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SISTEM DE ALIMENTARE LPG 15–15
REDUCÃTOR/VAPORIZATOR. Reducãtorul/vaporizator este un dispozitiv care realizeazã conversia gazului din fazã lichidã în fazã gazoasã cu posibilitatea reglãrii presiunii gazului în vederea alimentãrii motorului. Gazul, din rezervorul instalaþiei, la presiunea de 700-800kPa (stare lichidã), intrã prin orificiul de aliminentare (A) în prima camerã de reducere a presiunii (B). Aici presiunea gazului scade la aproximativ 0,5 bar. Reducerea presiunii este obþinutã datoritã acþiunii presiunii gazului asupra membranei (1) prin intermediul pastilei (3) montatã pe pârghia (2), pastilã care obtureazã orificiul de alimentare (C). Aceastã reducere reduce re a presiunii este datã de diferenþa dintre presiunea din rezervorul de gaz ºi presiunea exercitatã asupra pastilei de plastic de cãtre tandemul arc calibrat (4)-membrana (1). Dupã cum se ºtie, scãderea bruscã a presiunii unui gaz este însoþitã de scãderea bruscã a temperaturii sale. Pentru a compensa scãderea temperaturii temper aturii gazului, apa utilizatã în sistemul de rãcire a motorului este circula tã în camera (D), care înconjoarã complet camera (B). Circulaþia gazului din camera (B) spre canalul (F) este controlatã de supapa (10) acþionatã de electromagnetul (11). Când motorul nu este pornit sau funcþioneazã pe benzinã, bobina electromagnetului nu este alimentatã cu tensiune, deci neexercitându-se nici o forþã asupra supapei, aceasta etanºeazã canalul (E). La schimbarea alimentãrii pe gaz, bobina primeºte tensiune ºi supapa (11), sub acþiunea forþei electromagnetice, electromagn etice, deschide canalul (E) ºi permite trecerea gazului prin canalul (F). Trecând prin canalul (F) gazul trece în a doua camerã de reducere a presiunii (G) care este conectatã la mixerul instalaþiei. Gazul din aceastã camerã reacþioneazã la vaccum-ul creat de funcþionarea motorului, membrana (5) se deplaseazã spre interior, permiþând supapei sup apei (7) prin intermediul pârghiei (6) sã deschidã d eschidã orificiul (F). Dacã se realizeazã o creºtere a valorii absolute a vacuum-ului, acest fapt va duce la mãrirea deplasã rii membranei ºi deci la trecerea unei cantitãþi mai mari de gaz în camera (G). În caz contrar, dacã valoarea absolutã a vacuum-ului scade, membrana se va deplasa mai puþin ºi va trece o cantitate mai micã de gaz. Reglajul debitului de gaz la relanti se regleazã cu ajutorul ºurubului de reglaj (8) prin intermediul arcului calibrat (9) care va controla debitul de gaz care trece prin canalul (F) cãtre camera (G).
6
8
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15–16 SISTEM DE ALIMENTARE LPG
MIXER. Mixerul realizeazã proporþionarea amestecului amesteculu i carburant format din aer ºi gaz în scopul funcþionãrii corespunzãtoare a motorului. Gazul provenit din reducãtor/vaporizator este aspirat în motor prin efect Venturi (prin orificiile practicate pe circumferinþa corpului mixerului) datoritã dat oritã vacuum-ului creat de trecerea aerului aer ului spre motor, debitul de gaz fiind direct proporþional cu viteza de curgere a aerului. Mixerul este montat pe galeria de admisie în interiorul unei piese de aluminiu.
CONDUCTE DE ÎNALTÃ PRESIUNE. Sunt proiectate sã reziste la presiuni de pânã la 45 bar. Realizeazã conexiunile dintre - buºonul de alimentare ºi rezervorul de gaz; - rezervorul de gaz ºi electrovalva LPG din compartimentul motor; - electrovalva LPG ºi reducãtor/vaporizator. Înaintea realizãrii conexiunilor se va realiza traseul conductelor folosind dispozitive speciale de îndoire pentru a evita apariþia tensiunilor la locurile de îmbinare. Conducta care face legãtura dintre rezervor ºi electrovalva LPG va fi poziþionatã cât mai departe de conductele gazelor de evacuare ºi de pãrþile zimþate ale caroseriei. Fixarea acesteia se va face cu ajutorul clemelor de fixare la o distanþã de maxim 80 cm una de alta. Toate conexiunile supuse vibraþiilor trebuie fixate cu ajutorul unor legãturi elastice.
COMUTATORUL COMUTATORUL 223. Acest comutator poate fi utilizat pentru vehiculele dotate dota te cu sistem de alimentare cu injecþie ºi/sau carburator. Blocul electronic este montat într-u într -u cutie de dimensiuni mici. Aceasta poate fi plasatã plasat ã într-un loc în care se poate avea uºor acces.Comutatorul acces.Comutatoru l 223 reprezintã un pas superior în evoluþia sistemelor de alimentare cu gaz, în mod special în cea ce priveºte achiziþionarea semnalului de turaþie necesar alegerii momentului schimbãrii combustibilului necesar alimentãrii (benzinã-gaz) (benzinã-ga z) precum ºi a funcþionãrii întregului sistem la parametrii corespunzãtori. Buton ul de comandã a trecerii pe gaz este încã o realizare foarte importantã. importantã.
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SISTEM DE ALIMENTARE LPG 15–17
Comutarea manualã pe benzinã . Pentru a comanda funcþionarea pe benzinã: 1. dacã led-ul are culoarea portocalie, se apasã o datã pe buton; 2. dacã led-ul are culoarea verde, se apasã de douã ori pe buton. În acest caz vehiculul funcþioneazã pe benzinã. În aceste condiþii supapele de gaz sunt închise. Vehiculul funcþioneazã alimentat cu benzinã ca ºi cum sistemul de alimentare cu gaz nu ar fi prezent pe vehicul. Comutarea manualã pe gaz. Acest mod de funcþionare este obþinut atunci când se dã la cheie ºi se þine apãsat butonul. Led-ul de stare se aprinde intermitent schimbându-ºi succesiv culoarea (verde ºi roºu). Acest mod de funcþionare reprezintã doar o soluþie de urgenþã atunci când motorul nu porneºte sau sistemul de alimentare cu benzinã prezintã un defect. Indicaþia nivelului de umplere a rezervorului de gaz. Comutatorul 223 este proiectat ºi ca indicator al nivelului de umplere al rezervorului; pe partea frontalã a comutator ului sunt alte douã led-uri. Dacã senzorul rezervei de gaz este conectat, indicaþiile celor douã led-uri este urmãtoarea: Led 1
Led 2
Grad umplere
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15–18 SISTEM DE ALIMENTARE LPG
2. se þine motorul turat la turaþia respectivã cel puþin 5 secunde; 3. dupã 5 secunde se mãreºte turaþia motorului ºi se verificã pâlpâir ea led-ului (culoarea fiind tot portocalie), portoca lie), apoi se lasã turaþia sã scadã pentru a verifica comutarea, dacã d acã led-ul de stare nu pâlpâie se repetã procedura proced ura începând cu punctul 2. b) Setarea manualã a turaþie-prag pentru comutarea benzinã-gaz De fiecare datã când este necesarã setarea manualã a turaþiei de comutare se vor respecta urmãtorii paºi: 1. se pune contactul (fãrã a porni însã motorul); 2. se trece contactul pe „OFF”; 3. þinând apãsat butonul comutatorului se porneºte motorul (led-ul de stare pâlpâie ºi are culoarea roºie); 4. þinând apãsat butonul comutatorului se tureazã motorul la turaþia doritã (se recomandã 2.500rpm); 5. cu motorul ajuns la turaþia doritã se elibereazã butonul; 6. pentru a verifica pragul comutãrii, urmãtoarele indicaþii ale led-ului de stare au semnificaþiile date. portocaliu, portocaliu, fãrã pâlpâire pâlpâire - comutarea nu este permisã permisã portocal portocaliu, iu, cu pâlp pâlpâire âire - comut comutarea area este permisã permisã c) Timpul de suprapunere pentru combustibili (benzinã ºi gaz) Secvenþa de setare este urmãtoarea: 1. se pune contactul (fãrã a se porni însã motorul); 2. se trece contactul pe „OFF”;
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SISTEM DE ALIMENTARE LPG 15–19
SCHEMÃ ELECTRICÃ SISTEM DE ALIMENTARE LPG.
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15–20 SISTEM DE ALIMENTARE LPG
Moduri de funcþionare Existã trei moduri de funcþionare. a) Modul cu automemorare Modulul de comandã verificã existenþa semnalului senzorului TPS. Dacã semnalul este prezent atunci modulul de comandã va þine cont de el, în caz contrar va fi utilizat numai semnalul oferit se senzorul lambda. b) Modul programãrii cu calculatorul Toate datele sunt reglate de calculator, modul cu automemorare fiind ignorat. c) Modul preprogramat Pentru comanda vehiculului ai cãror parametrii sunt deja cunoscuþi, modulul de comandã poate fi achiziþionat deja programat de la firma producãtoare OFFICINE LOVATO S.p.a.. Observaþii: Când se cupleazã siguranþa la baterie, modulul de comandã reseteazã motorul pas cu pas, prin poziþionarea acestuia la jumãtatea cursei. În aceastã fazã, led-ul galben se aprinde, ºi se va interpreta aprinderea led-urilor (led-ul de stare, led-ul 1, led-ul 2) astfel: 1. led-uri aprinse - modulul de comandã nu are date memorate, fiind gata sã intre în modul cu automemorare. 2. led-uri stinse - modulul de comandã reþine datele obþinute în modul cu automemorare. 3. led-urile pâlpâie pentru 10 secunde, se cunde, apoi se sting – modulul de comandã reþine datele d atele obþinute în urma programãrii cu calculatorul.
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SISTEM DE ALIMENTARE LPG 15–21
Observaþie: acest tip de modul de comandã este deasemenea capabil sã memoreze un semnal al unui senzor de oxigen, inversat, cînd cablajul este ataºat în modul DOC 12 (circuit deschis). Setarea funcþionãrii pe gaz. a) Se lasã motorul sã funcþioneze cu benzinã pentru cîteva cît eva minute pentru a lãsa timp ca senzorul lambda sã funcþioneze la temperatura de lucru. b) Se schimbã alimentarea pe gaz ºi se tureazã motorul în intervalul 3000-3500 rpm. Dacã senzorul lambda este foarte încins avem situaþia în care led-ul galben este aprins iar led-urile verde ºi roºu pâlpâie alternativ. Se accelereazã ºi se decelereazã de câteva ori ºi se aduce motorul la o turaþie din intervalul 2500-3000 rpm pentru a permite modulului de comandã sã obþinã poziþia optimã a carburaþiei. În aceste caz, modulul de comandã corecteazã carburaþia ºi, în acelaºi timp cautã poziþia optimã a motorului pas-cu-pas. c) Dacã frecvenþa pâlpâirii nu este suficient de ridicatã, sistemul memoreazã carburaþia ºi afiºeazã aceastã condiþie prin pâlpâirea unuia din cele trei led-uri pentru 5 secunde. Afiºarea stãrii modulului de comandã. a) Led-ul galben pâlpâie rapid 5 secunde. Aceastã Acea stã condiþie indicã faptul cã modulul de comandã a memorat carburaþia ºi întregul sistem funcþioneazã corect. Din acest moment cele trei led-uri afiºeazã carburaþia vehiculului. b) Led-ul roºu pâlpâie rapid 5 secunde. Aceastã condiþie indicã faptul cã modulul de comandã a memorat carburaþia, dar aceasta are tendinþa de îmbogãþire cu gaz ºi motorul funcþioneazã înecat. Este necesarã mãrirea debitului de
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15–22 SISTEM DE ALIMENTARE LPG
CUPLURI DE STRÂNGERE BUªON ALIMENTARE ªuruburi prindere
-
4N m
± 2N m
M10
1 5N m
± 5N m
REZERVOR Piuliþe prindere bride plastifiate pe suport rezervor
MULTISUPAPÃ ªuruburi fixare multisupapã pe rezervor
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SISTEM DE ALIMENTARE LPG 15–23
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15–24 SISTEM DE ALIMENTARE LPG
DIAGRAME DE DEFECT MULTISUPAPÃ Grad de încãrcare mai mic de 80% Cauze
Mod de rezolvare
Înclinaþie necorespunzãtoare a rezervorului.
Se corecteazã înclinarea
Grad de încãrcare mai mare de 80%
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SISTEM DE ALIMENTARE LPG 15–25
Furnizeazã prea mult gaz Cauze Mod de rezolvare Garnitura de plastic a celei de-a doua camere de reducere Se demonteazã vaporizatorul vaporizator ul ºi se verificã garnitura. Se a presiunii lipseºte, nu etanºeazã corect sau este verificã vaporizatorul. deterioratã. Vaporizatorul este îngheþat Cauze Nu se realizeazã circulaþia apei calde.
Mod de rezolvare Se verificã circulaþia apei calde sau existenþa bulelor de aer în lichidul de rãcire al motorului.
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15–26 SISTEM DE ALIMENTARE LPG
Nu preia setarea automatã a funcþionãrii pe gaz Cauze Mod de rezolvare Modulul LOV-ECO este deja programat. Se urmeazã procedura de resetare a modulului de comandã. Modulul LOV-ECO este defect. Se înlocuieºte modulul LOV_ECO. Lipsa tensiunii de alimentare la comutator (conductorul Se verificã tensiunea pe conductorul albastru dupã ce a albastru). fost realizatã trecerea pe gaz, se verificã toate conexiunile (cablajul) comutatorului. Conductoarele alb ºi galben ale senzorului de oxigen Se verificã conexiunile conform schemelor LOVATO. sunt incorect conectate.
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SISTEM DE ALIMENTARE LPG 15–27
Consum ridicat de combustibil Cauze
Mod de rezolvare
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15–28 SISTEM DE ALIMENTARE LPG
SCHEME ELECTRICE
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SISTEM DE ALIMENTARE LPG 15–29
DESCRIERE CONECTORI X2
Co
IP ºi
blaj blajul ul de faþã faþã (14 (14 pin pini) i)
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15–30 SISTEM DE ALIMENTARE LPG
ASPECTUL CONECTORILOR
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SISTEM DE ALIMENTARE LPG 15–31
AER CONDIÞIONAT, VENTILATOR ELECTRIC, MOTOR VENTILAÞIE CLIMATIZARE.
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