(CGI Vehicle Features - AH07.70-P-0002-02VA)

ENGINE 272.985 in MODEL 211.057 /257, 219.357

The engine can be driven by engine control in two operating modes:

Homogenous mode
Stratified charge operation.

The differences between the operating modes are listed in the table.

	Homogenous mode	Stratified charge mode
Engine characteristics	High torque and high output	Minimal fuel consumption
Operating range	Idle Motor speed less than 3500 rpm: upper partial load, full load Motor speed greater than 3500 rpm: upper partial load, full load Requested temperature increase for catalytic converter or NO_X storage catalytic converter	Partial load and motor speed less than 3500 rpm Engine temperature greater than -10°C Engine load less than 45% Temperature of NO_x storage catalytic converters 250 to 500°C NO_x storage catalytic converters regenerated (no NOx stored) NO_x sensors ready to operate Altitude below about 1700 meters Sensor rotor adaptation occurs (e.g. after discontinuity of terminal 30 required again)
Number of injections	Single Double for acceleration and for full load up to about 4500 rpm	Double at low loads Double at high loads
Air/fuel ratio λ	Lambda = 1 Lambda smaller than 1 due to fuel excess (rich) Fuel air mixture cloud with homogeneous mixing	Lambda 1.3 to about 8.0 (lean mixture due to air excess) Fuel air mixture cloud stacked
Injection timing point	In the induction period	In the compression phase before and after the ignition timing
External exhaust gas recirculation (ARF)	NOT APPROVED	Regulated recycle rate of up to 30%
Emission control	Conversion from HC (hydrocarbons), CO (carbon monoxide) and NO_x (nitrogen oxides) in the 3-way catalytic converters Regeneration of NO_x storage catalytic converter for a lambda less than 1 (rich)	Conversion of HC (hydrocarbons) and CO (carbon monoxide) in the 3-way catalytic converters Storage of nitrogen oxides (NO_x ) in the NO_x storage catalytic converters
Reaction to faults	Engine diagnosis indicator lamp is actuated for exhaust-relevant faults.	In case of error stratified charge operation is locked out and homogeneous operation activated. Engine diagnosis indicator lamp is no longer actuated since the limits EURO4 in homogeneous operation is achieved. Fuel saving discontinued.