Example of a turbocharger adaptation calculation
Turbocharging of vehicle engines

The engine used for this calculation example is a 2.5 L direct-injection diesel engine, for which we want to obtain a pme of 17 bar from 1,800 rpm and a rated power of 120 kW at 4,400 rpm. The calculation process is described below. Tables 3, 4 and 5 progressively indicate (in italics) the assumptions used and the particular operating conditions of this motor. The values used for this fictitious example are close to current production applications.

• General approach: first, we determine the engine's air requirement under full load conditions; in this particular case, we'll perform the calculation at the two operating speeds indicated. Once the compressor has been selected, the turbine and control system are defined. In this example, we first...