CNG Bi-Fuel ECU

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1. Characteristics

▶ OBD-II Self-diagnosis function
▶ Service data monitoring
▶ Output of self-diagnosis failure code

2. Fail-safe function

▶ Automatic switch to gasoline fuel injection in case of disconnection or short circuit of CNG injector.
▶ Automatic switch to gasoline fuel injection in case of CNG pressure sensor and temperature sensor failure.
▶ Automatic switch to gasoline fuel injection if the CNG tank pressure goes below a set pressure.
▶ Automatic switch to gasoline fuel injection in case of disconnection or short circuit of cut-off solenoid valve.
CNG Bi-Fuel ECU

3. Basic performance

▶ Built-in ignition advance function (limitless ignition advance available)
① Output signal direct control, which is classified into the power TR signal control type or primary coil direct control type depending on the vehicle type
② Applicable regardless of the type of vehicle
③ The entire system is very stable as the turn on timing and the turn off timing are simultaneously advanced by a set degree at the time of ignition advance, the dwell time is always consistent regardless of the degree of advance, and ignition energy is stable.
④ Optimal ignition advance map for each operating area is applied.
▶ Independent AMP Module (A/D Converter-mounted) installed for each cylinder
· Easy maintenance and economic feasibility; only need to change the individual module unit for the problem cylinder when a problem occurs
· Independently processing and sending pressure signals from the individual cylinder
▶ Produces power in CNG mode, which is equivalent to over 90% of that produced in the gasoline mode
Starts the engine using CNG fuel at cold start and/or initial start-up (reduced emission during cold start and improved fuel economy) 3 operating modes
① Gasoline Mode: Start-up and operation using gasoline
② Auto Mode: Start-up with gasoline fuel and automatic switch to CNG mode when certain engine requirements (such as coolant temperature, rpm, etc.) are satisfied
③ CNG Mode: Start-up and operation using CNG

4. Reliability and stability

▶ CE certified (R-110)
▶ EMC certified (ES-96200)
▶ Satisfies European Emission Standards EURO-Ⅵ

5. Additional Functions

▶ Auto-tuning integrated
▶ Increased power output in case of rapid acceleration in a high load operating range through simultaneous control of gasoline-CNG (or LPG) injectors
▶ Precise control of injection through the measurement of accurate injection timing of Pick & Hold control type injector
▶ Air-fuel ratio control in the open loop range
▶ Correction according to the battery voltage
▶ Invalid injection time correction

6. Specification

Operating Temperature Range -40℃~120℃
Operating Voltage 8V~16V
13 input channels (6 analog channels, 6 interrupt channels, 1 digital channel)
10 output channel
Indicator FND type that displays the CNG tank pressure in a digital number, minimum display
unit 1 bar, degree: ±3 bar, fuel switch function, fuel status (gasoline, LPG or CNG) LED display
Communication RS232, CAN