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CNG Bi
Fuel System
ECU

This system is equipped with a tank for alternative fuels such as natural gas or propane, allowing for economical operation compared to conventional fuels, with the ability to switch between them.

However, it has the drawback of reduced driving performance during rapid acceleration and high-load driving, typically achieving around 80% of the output of conventional gasoline due to the combustion characteristics of the fuel.

To address these drawbacks, this product features a smart ECU that enhances fuel efficiency and torque while minimizing these limitations.

Features

	Strength	Effect
Expansion of the conditions for conversion of spent fuel (Volatile ↔ CNG)	Can be switched to CNG during idle Can be switched to CNG during cold CNG start-up possible at initial start-up	Reduce gasoline consumption by more than 50% compared to the previous one by eliminating the time to use only gasoline during cold, and increase economic feasibility (more than 50% mixing ratio during cold) Increasing the effect of reducing harmful emissions that are excessively generated during cold start-up
Petrol and CNG Injector precision control	Design and application of contactless control circuit, simultaneous control of petrol and CNG injector Sequential switching by cylinder in fuel change Control Peak & Hold with software Injector Learning Control Calibration of injection amount according to battery voltage	Precise injector control ensures engine stability and output performance equal to gasoline Can control Peak & Hold without changing hardware when changing CNG injector Reduction of engine noise and vibration by sequential switching of fuel
Applying the Fail safe algorithm	Automatically switch to gasoline fuel when the pressure drops below the CNG tank's operating pressure Automatically switch to gasoline fuel in case of CNG pressure sensor failure CNG Pressure and Pressure Sensor Real-time Monitoring Function No high pressure pump processing and replacement required	Prevent accidents by preventing engine from starting off and inoperating while driving Ensuring safety of operation

Differentiation

Improved performance

60% less gasoline consumption in cold weather

For existing products, 100% CNG 0% gasoline from start to engine normal temperature
At least 40% mixture control from start-up, 40% gasoline, 60% CNG
100% CNG at normal temperature

Improvement in economic feasibility

20% better torque compared to pure natural gas in high power mode

Complement the shortcomings of natural gas by injecting two fuels simultaneously in rapid acceleration and high load areas
0-100 km/h acceleration experiment: 11 seconds for gasoline, 14 seconds for pure natural gas (80% compared to gasoline) / 50% for mixed fuel (90% compared to gasoline) for 12 seconds

CNG Bl Fuel System ECU Input and output


INPUT	Analog 6ch	TPS: Calibrate fuel amount with rapid acceleration and high load area status WTS: Determining when to convert fuel O2S: High load area control and project learning correction FTS: Fuel density correction according to fuel temperature FPS: Fuel amount correction according to fuel pressure change, automatic gasoline conversion function under a certain pressure. FFS: Display remaining fuel through fuel tank pressure detection BAT: Inject invalid injection according to battery voltage, And PICK TIME CORRECTION
INPUT	Digital 1ch/interrupt1ch	IG: Recognition of operating conditions of natural gas ECU CAS: Fuel cut-off or supply through engine revolution measurement/engine normal operation determination
OUTPUT	CNG Injector 4ch (Pick & hold type)	Pick interval setting: up to 20ms hold interval: frequencies up to 1-30 kHz Duty 0-100% Current: max 15A Feature: Pick time correction according to battery voltage
	Gasoline Injector 4ch (on/off type)	Current: max5A Characteristics: It is contactless, and there is no turning off the engine even if the conversion time is switched within a few us. Two fuels can be controlled simultaneously in high-load areas or during rapid acceleration, consumption by increasing torque Now, improve your satisfaction
	solenoid (Pick & hold type)	Current: max5A Feature: Increase durability by preventing solenoid heat rise even in long operating hours.
Indicator	Amount of fuel	LED 6 grade
Indicator	State	Petrol/CNG/CNG Change Standby (3 Status Marks)

CNG Bl Fuel System ECU Software

Setting mode

Fuel conversion: engine speed, fuel temperature
Fuel level: Setting the level according to pressure
Emergency transition: Fuel pressure and temperature, coolant temperature
Others: Engine rev, maximum injection, diagnostic trouble memory, TPS type

Tuning mode

Fuel density calibration: setting fuel increase/decrease according to fuel pressure and temperature
Blending setting: Blending ratio setting according to engine load
Injector settings: Set the holding frequency of the Full-in interval according to the impedance of the injector

Data collection & test mode

Data collection: Display and store data in input sensor and output status
(excel file conversion is possible)
Test mode: Forced/stopped the output unit and calibrated fuel deviation by cylinder

Contact

Address

THESYSTEM Co., Ltd.
3rd floor, 5, Magil, Mieum Gukje 5-ro, Gangseo-gu, Busan