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7/28/2019 CNG Base Training2
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CNG
Base training
7/28/2019 CNG Base Training2
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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.
4. High pressure pipes and fittings.
5. Pressure gauge.
6. Pressure reducer.
7. Petrol solenoid valve.
8. Mixer.
9. Power screw.
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Summary (II)
3. The electronic components.1. Sunny ECU.
2. Change over switch.
3. Injector emulators.
4. Spark advancers.
4. System tuning.
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CNG – Chemical and physical properties
• CNG = Compressed Natural Gas.
• Composition depends from the CNG origin.• CNG gas mixture: methane (CH4)
nitrogen (N2)carbon dioxide (CO2)
• Mercaptanes added to give smell
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CNG and environment
CNG pollution VS. petrol pollution.
• Less carbon monoxide (CO) poisonous
• Less 22% carbon dioxide (CO2) global warming
• No lead presence poisonous
• Less poisonous unburned hydrocarbons (HC)
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Equipment structure
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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 – Excess flow valve closed
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Cylinder valve – Venting holes
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Cylinder valve – Safety devices
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Cylinder valve – Burst disc
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Cylinder valve – Fuse plug
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Filling unit – Charge phase
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Filling unit – Non return valve close
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High pressure pipes and fittings
• Steel pipes (burst pressure > 800 bar).
• M12 fittings for BRC components.• Dedicated BRC ferrules.
• Periodical leakage test on fittings (water & soap).
• Ferrule has to be correctly fixed on the pipe.
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Pressure gauge
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Pressure gauge
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CNG 3 stage reducer
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CNG reducer – First stage
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CNG reducer – First stage closed
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CNG reducer – First stage open
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CNG reducer – Pressure relief valve closed
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CNG reducer – Pressure relief valve open
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CNG reducer – From the first to the second stage
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CNG reducer – Second stage
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From the second to the third stage – solenoidvalve closed
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From the second to the third stage – solenoidvalve closed
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From the second to the third stage – solenoidvalve open
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From the second to the third stage – solenoidvalve open
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CNG reducer – Third stage
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CNG reducer – Third stage
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Third stage – Idle +close
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Third stage – Idle +open
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Third stage – Sensibility +close
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Third stage – Sensibility +open
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CNG reducer - Water circuit
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Petrol solenoid valve
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Petrol solenoid valve
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Mixer and power screw – engine in low load
Mixer and power screw engine in full load and
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Mixer and power screw – engine in full load andpower screw +open
Mixer and power screw engine in full load and
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Mixer and power screw – engine in full load andpower screw +closed
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Sunny ECU - Functions
• Switch over.• Safety.
• Pressure gauge reading.
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Sunny ECU – Electrical connections scheme
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Micro switch - Functions
• Drive the main ECU for theswitch over.
• Fuel kind indication (bicolourled).
• Pressure indication (4 led).
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Micro switch – Switch over function
Petrol mode.
• Switch pushed in the “petrol pump” position.
• Rectangular LED's colour: red
Switch from petrol to CNG.
• Push the switch in the middle position.
• Rectangular LED's colour: switched off
• Wait the empty of the carburettor.
• Push the switch in the “BRC” position.
• Rectangular LED's colour: green
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Micro switch – Switch over function
CNG mode.
• Switch pushed in the “BRC” position.
• Rectangular LED's colour: green
Switch from CNG to petrol.
• Push the switch in the middle position.
• Rectangular LED's colour: yellow
• Wait the filling of the carburettor.
• Push the switch in the “petrol pump” position.
• Rectangular LED's colour: red
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Injector emulator Modular HI MM - Function
Petrol mode.• The petrol ECU continue to drive
the petrol injector.
• The relé in the injector emulator
is in the normally closed position.
CNG mode.
• The petrol ECU drive the coil in
the injector emulator.• The petrol injector stay close.
• The relé in the injector emulatoris in the open position.
Injector emulator Modular HI MM
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Injector emulator Modular HI MMElectrical connections scheme
• Green wire to the white/green from the ECU.
• Black wire with the black of the ECU.
• Red wire to the battery 12 V, under 7,5 A fuse.
Injector emulator Modular HI MM
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Injector emulator Modular HI MMElectrical connections scheme
• Cut thenegative wireof the petrolinjectors.
• Connect theorange wire tothe injectorside.
• Connect the
violet wire tothe petrol ECUside.
S k d B i f
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Spark advancer – Basic features
• Change, increasing, the spark advances in CNG
mode.• Hold the original spark advances in petrol mode.
• Increase the torque and the power in CNG mode.
• Reduce the exhaust temperature in CNG mode.
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Agena - Antares
• Led on = advanceconnected.
• Spark advance setting by
micro-switches.• Emergency red connector
in case of spark advancerfailure.
A A t
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Agena - Antares
Micro-switches setting
• Cylinder number: set switches 1 & 2
• Advance degree: set switches 3 & 4
• Advance operating conditions: set switches 5 & 6
A i A S t
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Aries - Acroux - Santro
Aries, Acroux & Santro work as
spark advancer in CNG mode.
It advance the crankshaft signal
in input to the petrol ECU.
t
Crankshaft signal from the sensor (schematic)
t
Crankshaft signal to the petrol ECU
6°15°
A i A S t
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Aries – Acroux - Santro
• Led on = advance connected.• Advance intervention in idle and cut-off conditions
adjustable by operating on a screw.
• Spark advance setting by micro-switches.
• Emergency connector in case of spark advance failure
Pegaso
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Pegaso
Pegaso works as spark retarderin petrol mode.
The correct spark advance in
CNG is obtained adjusting the
distributor position.
In petrol mode Pegaso works
retarding the spark to obtain the
original value.
Pegaso
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Pegaso
• Register to set thespark advance onpetrol to the originalvalue.
• Emergency connectorin case of spark advance failure
System tuning – Engine in idle load and idle
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y g gscrew +close
System tuning – Engine in idle load and idle
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y g gscrew +close
System tuning – Engine in idle load and idle
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y g gscrew +open
System tuning – Engine in idle load and idle
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screw +open
System tuning – Engine in partial load and
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sensibility screw +closed
System tuning – Engine in partial load and
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sensibility screw +closed
System tuning – Engine in partial load and
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sensibility screw +open
System tuning – Engine in partial load and
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sensibility screw +open
System tuning – Engine in full load and power
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screw +closed
System tuning – Engine in full load and power
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screw +open
Mixer + Power screw + Reducer
Th i l fl h i i