Method for engine condition control with turbocompressor controllable bypass

A method of controlling peak firing pressure and turbine inlet temperature in a diesel engine having a turbocharger, the method comprising:

• sensing inlet charge air pressure and charge air temperature;
• obtaining fuel injection timing, engine speed and load;
• determining current peak firing pressure;
• computing charge air density and turbine inlet temperature;
• transmitting charge air density, turbine inlet temperature and peak firing pressure to an electronic bypass valve control unit (BVCU);
• comparing transmitted values of the turbine inlet temperature and the peak firing pressure with allowable maximums of these values stored in the BVCU;
• and
• controlling the bypass valve to divert a sufficient portion of compressed air from a compressor outlet around the engine to maintain at least one of the peak firing pressure and the turbine inlet temperature within maximum allowable values.