Model   NO. Basic fuel system Bi-fuel(LPG/CNG) Control system Remarks Fuels Alternation Fuel System Fuel Control Spark Timing Control Fuel Selection  1 Carburetor Manual Carburetor Open loop 3-phase No fuel metering display in driver room site  2 Carburetor Manual Carburetor Open loop Commutator (3-phase)  3 Carburetor Auto Carburetor Open loop 2-phase No fuel metering display in driver room site  4 Carburetor Auto Carburetor Open loop Auto Commutator  5 Carburetor Auto Carburetor Close loop Commutator  6 Carburetor Auto Carburetor Close loop Auto Commutator  7 Injection Auto Carburetor Open loop 2-phase No fuel metering display in driver room site  8 Injection Auto Carburetor Open loop Commutator  9 Injection Auto Carburetor Open loop Auto 2-phase No fuel metering display in driver room site 10 Injection Auto Carburetor Close loop 2-phase No fuel metering display in driver room site 11 Injection Auto Carburetor Close loop Commutator 12 Injection Auto Carburetor Close loop Auto Commutator 13 Injection Auto Injection Close loop 2-phase under Developing 14 Injection Auto Injection Close loop Auto Commutator under Developing     ▶ Manual fuels alternation ▶ No CNG fuel metering display in driver room site ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------   ▶ Manual fuels alternation ▶ Additional CNG fuel metering(pressure) display by commutator    (Available to display 2 fuels metering in dirver room simultaneously) ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ No CNG fuel metering display in driver room site ▶ Emergency CNG fuel cut-off ▶ Simple fuel selection by 2 phase change-over switch --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ Automatic Spark timing alternation(for High Engine power & fuel economy) ▶ Seasonal(winter/summer) spark timing selection mode(For higher engine performance) ▶ Additional CNG fuel metering display by commutator    (Available to display 2 fuels metering in dirver room simultaneously) ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ Stoichmetric Air-fuel ratio(入) control in CNG mode    (for high engine performance & Low exhaust emission) ▶ Additional CNG fuel metering display by commutator    (Available to display 2 fuels metering in dirver room simultaneously) ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ Stoichmetric Air-fuel ratio(入) control in CNG mode    (for high engine performance & Low exhaust emission) ▶ Automatic Spark timing alternation(for High Engine power & fuel economy) ▶ Seasonal(winter/summer) spark timing selection mode(For higher engine performance) ▶ Additional CNG fuel metering display by commutator    (Available to display 2 fuels metering in dirver room simultaneously) ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ No CNG fuel metering display in driver room site ▶ Emergency CNG fuel cut-off ▶ Simple fuel selection by 2 phase change-over switch --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ Additional CNG fuel metering display by commutator    (Available to display 2 fuels metering in dirver room simultaneously) ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ Automatic Spark timing alternation(for High Engine power & fuel economy) ▶ Seasonal(winter/summer) spark timing selection mode(For higher engine performance) ▶ Additional CNG fuel metering display by commutator    (Available to display 2 fuels metering in dirver room simultaneously) ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ Stoichmetric Air-fuel ratio(入) control in CNG mode    (for high engine performance & Low exhaust emission) ▶ No CNG fuel metering display in driver room site ▶ Emergency CNG fuel cut-off ▶ Simple fuel selection by 2 phase change-over switch --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ Stoichmetric Air-fuel ratio(入) control in CNG mode    (for high engine performance & Low exhaust emission) ▶ Additional CNG fuel metering display by commutator    (Available to display 2 fuels metering in dirver room simultaneously) ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ Stoichmetric Air-fuel ratio(入) control in CNG mode    (for high engine performance & Low exhaust emission) ▶ Automatic Spark timing alternation(for High Engine power & fuel economy) ▶ Seasonal(winter/summer) spark timing selection mode(For higher engine performance) ▶ Additional CNG fuel metering display by commutator    (Available to display 2 fuels metering in dirver room simultaneously) ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ High engine performance & Low exhaust emission ▶ No CNG fuel metering display in driver room site ▶ Emergency CNG fuel cut-off ▶ Simple fuel selection by 2 phase change-over switch --------------------------------------------------------------------------------------------   ▶ Automatic fuels alternation ▶ Similon engine performance to petrol engine ▶ Automatic Spark timing alternation(for High Engine power & fuel economy) ▶ Seasonal(winter/summer) spark timing selection mode(For higher engine performance) ▶ Additional CNG fuel metering display by commutator    (Available to display 2 fuels metering in dirver room simultaneously) ▶ Emergency CNG fuel cut-off --------------------------------------------------------------------------------------------