1277 / 1980
GENERAL
2
Performance:
Fully electronic sequential fuel injection system
in both CNG and gasoline modes.
Distributor less Grouped Ignition (Wasted Spark
Ignition)
Minimum power drop in CNG, close to
theoretical values.
Specific ECU tuning for petrol and CNG.
1. Dual
independent
spark
advance
management (knock, drivability etc).
2. Dual air-fuel ratio control and management
(lambda close loop control).
3. Emission control strategies specific to
petrol and CNG.
Fuel cut-off during decelerations
Dedicated and independent engine over speed
control.
Smooth transition from petrol – CNG – petrol.
Transition to petrol in case of misfire detected in
CNG mode & vise versa.
Accessory load compensation for smooth idle.
1. Alternator load
2. Power steering load
3. Air conditioner load
4. Cooling fan load
Transition management based on :
1. Driver’s request: Petrol – CNG- petrol
2. Fault diagnosis: CNG – petrol & Petrol -
CNG
3. Empty CNG tank detection: CNG-petrol &
Petrol - CNG
Additional Features
Warm up Corrections
Mode Based transient injection control
Model based transient ignition control
Model based air/water temperature
compensation
Limp home and recovery
Adaptive fuel injection control
Catalyst light-off control during engine warm up
Altitude compensation
Engine Knock Control
Fuel Pump relay Control
Post Ventilation – Fan control
4. GENERAL INSTRUCTION / PRECAUTIONS
WHILE WORKING ON CNG VEHICLE:
In Workshop
Provide safe locations for parking and working
e.g. away from openings in the ground like
drains and pits, and sources of ignition
Clearly identify each CNG vehicle, e.g. with
suitably positioned signs, as a reminder to
people working on the vehicle, and anyone in
the vicinity, especially those who may be
carrying out ‘hot work’ (welding, burning,
infrared heating etc.)
Provide plant and equipment that is suitable for
its intended use;
Do not take vehicles with leaking CNG systems
inside a workshop or other building, as
dangerous concentrations of vapors could
accumulate;
Trained staff on what to do in an emergency.
Wear suitable personal protective equipment
(PPE) to prevent cold burns, eye damage and
the discharge of static electricity;