Exhaust Gas Turbocharging, Basic Function - GF09.40-P-9900A

Engine All (4xWD) 

Engine All (CAR) 

Sample diagram of exhaust gas turbocharging 

Courtesy of MERCEDES-BENZ USA

Overview 

This document contains information on:

• General 
  • Single-speed exhaust-gas turbocharging 
  • Multistage exhaust-gas turbocharging 
• Function requirements 
• Function 

General 

The exhaust gas turbocharging compresses the intaken fresh air (A) and increases the cylinder charge level. The Engine output increases.

There are different charging procedures for exhaust-gas turbocharging.

Single-speed exhaust-gas turbocharging 

The single-speed exhaust turbocharging is realized with an exhaust gas turbocharger.

Multistage exhaust-gas turbocharging 

The multistage exhaust gas turbocharging usually takes place with two exhaust gas turbochargers of differing sizes, arranged in succession. Alternatively, exhaust turbocharging can take place with two exhaust gas turbochargers arranged in parallel, e.g. with the Biturbo.

Function requirements 

• Combustion Engine in operation.

Function 

The exhaust gases (C) reach the turbine wheel via the intake at the turbine wheel housing of the exhaust gas turbocharger.

Via a constriction, thermal energy is converted into kinetic energy and the turbine wheel starts to rotate.

The turbine wheel is on the same shaft as the compressor wheel. The compressor wheel is set in motion by the rotation of the turbine wheel and intakes fresh air (A).

The intaken fresh air (A) is compressed in the compressor wheel housing and reaches the Engine through an outlet via the charge air cooler.

	Function schematics
	Function schematic for charging	Engine 608 in model 118, 177, 247	PE09.00-P-2500-97A
		Engine 282 in model 118, 177, 247	PE09.00-P-2500-97B
		Engine 260 in model 118, 177, 247 Engine 264 in model 167	PE09.00-P-2500-97C
		Engine 654 in model 118, 167, 177, 247 Engine 654 in model 213, 238, 257 as of model year 2021 Engine 656 in model 167	PE09.00-P-2500-97D
		Engine 256 in model 167 Engine 256 in model 213, 238 as of model year 2021 Engine 264 in model 213, 238, 257 as of model year 2021	PE09.00-P-2500-97E
		Engine 176, 177 in model 167 Engine 177 in model 290 as of model year 2021	PE09.00-P-2500-97F
		Engine 139 in model 118, 177, 247	PE09.00-P-2500-97G
		Engine 254 in model 167 as of model year 2023 Engine 254 in model 206, 214, 236, 254 Engine 256 in model 214, 223, 236	PE09.00-P-2500-97H
		Engine 176 in model 223	PE09.00-P-2500-97I
		Engine 279 in model 223	PE09.00-P-2500-97J
		Engine 139 in model 192, 206, 232, 236, 254	PE09.00-P-2500-97K
		Engine 654 in model 206, 214, 236, 254 Engine 656 in model 223	PE09.00-P-2500-97L
		Engine 177 in model 192, 223, 232	PE09.00-P-2500-97M
		Engine 274 in model 213 as of model year 2021	PE09.00-P-2500-97N
		Engine 656 in model 464	PE09.00-P-2500-97O
	Additional basic functions
	Boost pressure control, basic function		GF09.40-P-1000A
	Overrun mode bypass air, basic function	Engine 139, 176, 177, 254, 256, 260, 264, 274, 279, 282	GF09.40-P-1002A
	Temperature sensor upstream of exhaust gas turbocharger, basic function		GF09.40-P-2000A
	Electric turbocharger, basic function	Engine 139.5	GF09.40-P-2003A
	Exhaust gas turbocharger, basic function		GF09.40-P-2200A
	Charge air cooling, basic function		GF09.41-P-1000A
	Electric additional compressor, basic function	Engine 254, 256	GF09.50-P-1002A
	Basic function of pressure sensor upstream of exhaust gas turbocharger	Engine 139.9	GF09.40-P-2001A