Method and a system to control turbine inlet temperature

A method to control an internal combustion engine having an exhaust turbine, comprising:

• determining a turbine inlet temperature;
• entering a temperature reduction mode when the turbine inlet temperature exceeds a setpoint temperature;
• adjusting an engine parameter to cause the turbine inlet temperature to decrease;
• and
• increasing the setpoint temperature gradually to a maximum hardware temperature during the temperature reduction mode.

An internal combustion engine, comprising:

• an exhaust turbine coupled to an engine exhaust;
• engine cylinders having a fuel injector coupled to each of the engine cylinders;
• a throttle valve disposed in an engine intake;
• an EGR system with an EGR duct coupling the engine intake with the engine exhaust and an EGR valve disposed in the EGR duct;
• an electronic control unit electronically coupled to the fuel injectors and the EGR valve, the electronic control unit:
• determining a turbine inlet temperature;
• entering a temperature reduction mode when the turbine inlet temperature is greater than a setpoint temperature;
• adjusting at least one of a pulse width to the fuel injectors, an injection timing to the fuel injectors;
• a position of the EGR valve, and a position to the throttle valve to cause the turbine inlet temperature to decrease in response to entering the temperature reduction mode;
• and increasing the setpoint temperature after entering the temperature reduction mode.