CNG Base Training

7/25/2019 CNG Base Training

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CNG

Base training


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Summary (I)

1. CNG: physical and chemical properties.2. CNG and environment.3. CNG equipment.

1. Equipment structure.2. The mechanical components.

1. Cylinder.2. Cylinder valve.3. Filling unit.

. !igh pressure pipes and "ttings.#. $ressure gauge.%. $ressure reducer.&. $etrol solenoid valve.'. (i)er.*. $o+er scre+.


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Summary (II)

3. The electronic components.1. ,unny EC-.2. Change over s+itch.3. n/ector emulators.

. ,par0 advancers.

. ,ystem tuning.


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CNG Chemical and physical properties

CNG Compressed Natural Gas.Composition depends rom the CNG origin.CNG gas mi)ture: methane 4C! 5

nitrogen 4N 25car6on dio)ide 4C7 25

(ercaptanes added to give smell


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CNG Chemical and physical properties

8olumic mass 9 n.c.: ;& 0g7N5: 1,el ?ignition temperature: @ o petrol

nAamma6ility lo+er threshold: #;3B 6yvolumenAamma6ility upper threshold: 1#B 6y

volume


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CNG and environment

CNG pollution VS. petrol pollution.

ess car6on mono)ide 4C75poisonous

ess 22B car6on dio)ide 4C7 25 glo6al +armingNo lead presence poisonous

ess poisonous un6urned hydrocar6ons 4!C5


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Equipment structure


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Cylinder


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Cylinder


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Cylinder valve


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Cylinder valve Manual valve closed


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Cylinder valve Manual valve open


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Cylinder valve E cess !o" valve closed


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Cylinder valve #enting holes


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Cylinder valve Sa$ety devices


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Cylinder valve Burst disc


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Cylinder valve %use plug


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%illing unit


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%illing unit Charge phase


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%illing unit Non return valve close


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&igh pressure pipes and 'ttings

,teel pipes 46urst pressure @ ' 6ar5.(12 "ttings or D>C components.

edicated D>C errules.$eriodical lea0age test on "ttings 4+ater soap5.Ferrule has to 6e correctly ")ed on thepipe.


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ressure gauge


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ressure gauge


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CNG stage reducer


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CNG reducer %irst stage


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CNG reducer %irst stage closed


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CNG reducer %irst stage open


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CNG reducer ressure relie$ valve closed


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CNG reducer ressure relie$ valve open


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CNG reducer %rom the 'rst to the secondstage


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CNG reducer Second stage


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%rom the second to the third stage solenoid valve closed


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%rom the second to the third stage solenoid valve closed


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%rom the second to the third stage solenoid valve open


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%rom the second to the third stage solenoid valve open


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CNG reducer *hird stage


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CNG reducer *hird stage


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*hird stage Idle +close


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*hird stage Idle +open


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*hird stage Sensi,ility +close


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*hird stage Sensi,ility +open


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CNG reducer - .ater circuit


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etrol solenoid valve


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etrol solenoid valve


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Mi er and po"er scre" engine in lo" load

Mi d " " i i $ ll l d


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Mi er and po"er scre" engine in $ull loadand po"er scre" +open

Mi d " " gi i $ ll l d


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Mi er and po"er scre" engine in $ull loadand po"er scre" +closed


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Sunny EC/ - %unctions

,+itch over.,a ety.$ressure gaugereading.


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Sunny EC/ Electrical connections scheme


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Micro s"itch - %unctions

rive the main EC- orthe s+itch over.Fuel 0ind indication46icolour led5.$ressure indication 4led5.


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Micro s"itch S"itch over $unction

$etrol mode.,+itch pushed in the petrol

pump position.>ectangular E Hs colour:

red,+itch rom petrol to CNG.

$ush the s+itch in the middle position.>ectangular E Hs colour: s+itched oI Jait the empty o the car6urettor.$ush the s+itch in the BRC position.>ectangular E Hs colour: green


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Micro s"itch S"itch over $unction

CNG mode.,+itch pushed in the BRC position.>ectangular E Hs colour:

green,+itch rom CNG to petrol.

$ush the s+itch in the middle position.>ectangular E Hs colour: yello+Jait the "lling o the car6urettor.$ush the s+itch in the petrol pump position.>ectangular E Hs colour: red


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In0ector emulator Modular &I MM - %unction

$etrol mode. The petrol EC- continue todrive the petrol in/ector.

The relK in the in/ector

emulator is in the normallyclosed position.CNG mode.

The petrol EC- drive the coilin the in/ector emulator.

The petrol in/ector stay close. The relK in the in/ectoremulator is in the openposition.

In0ector emulator Modular &I MM


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In0ector emulator Modular &I MMElectrical connections scheme

Green +ire to the +hiteed +ire to the 6attery 12 8; under &;# L use.

In0ector emulator Modular &I MM


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In0ector emulator Modular &I MMElectrical connections scheme

Cut thenegative+ire o thepetrolin/ectors.

Connect theorange +ireto thein/ector side.

Connect theviolet +ire tothe petrolEC- side.


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Spar1 advancer Basic $eatures

Change; increasing; the spar0 advances inCNG mode.

!old the original spar0 advances in petrolmode.ncrease the torque and the po+er in CNG

mode.

>educe the e)haust temperature in CNGmode.


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2gena - 2ntares

Lgena Lntares +or0 as

spar0advancers in CNG mode.

They advance the negativecoil

signal.

t

gnition module signal 4+hite +ire5

t

gnition coil negative signal 4grey +ire5

%M 1#M


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2gena - 2ntares

ed on advanceconnected.,par0 advance setting

6y micro?s+itches.Emergency redconnector in case ospar0 advancer ailure.


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2gena - 2ntares

(icro?s+itches settingCylinder num6er: set s+itches 1 2

Ldvance degree: set s+itches 3 Ldvance operating conditions: set s+itches# %


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2ries - 2crou - SantroLries; Lcrou) ,antro +or0

as

spar0 advancer in CNGmode.

t advance the cran0sha tsignal

in input to the petrol EC-.

t

Cran0sha t signal rom the sensor 4schemati

t

Cran0sha t signal to the petrol EC-

%M 1#M

2 i 2 S


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2ries 2crou - Santro

ed on advance connected.Ldvance intervention in idle and cut?oIconditions ad/usta6le 6y operating on a scre+.,par0 advance setting 6y micro?s+itches.Emergency connector in case o spar0 advance

ailure


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egaso

$egaso +or0s as spar0

retarderin petrol mode. The correct spar0 advance inCNG is o6tained ad/usting

thedistri6utor position.

n petrol mode $egaso +or0sretarding the spar0 to o6tain

theoriginal value.


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egaso

>egister to set thespar0 advance onpetrol to theoriginal value.

Emergencyconnector in caseo spar0 advance

ailure

System tuning Engine in idle load and idle


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y g gscre" +close



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y g gscre" +close



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y g gscre" +open



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y g gscre" +open

System tuning Engine in partial load and


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y g g psensi,ility scre" +closed



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y g gsensi,ility scre" +closed



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sensi,ility scre" +open



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sensi,ility scre" +open

System tuning Engine in $ull load and


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po"er scre" +closed

System tuning Engine in $ull load and


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po"er scre" +open

Mi er + o"er scre" + 3educer


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*heorical !o" characteristic

Lir mass Ao+

CNG mass Ao+

idle

Full load (a) >$($o+er scre+ setting area

,ensi6ility scre+ setting area

dle scre+ setting area

CNG Base Training

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