What is Constant TRIT control and why is it used?

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What is Constant TRIT control and why is it used?Answer below

Sahaj Garg · Accepted Answer

Maximum power from an engine occurs at Rated TRIT.  However, the relationship between TRIT and T5 is not parallel. The ratio between T5 and T3 increases with increasing ambient temperature.  At higher ambient temperatures, controlling only with T5 Base results in a decline in TRIT.  The engine is being underfired.  A decline in TRIT results in a decline in output power. To get around this problem, a control feature called Constant TRIT control is used.  Knowing the relationship between T5 and TRIT, we can calculate what T5 should be to run at Rated TRIT at high ambient temperatures.  A bias is added to T5 Base at higher ambient temperatures so that the engine will continue to run at Rated TRIT, regardless of the ambient temperature.  The bias is known as T5 offset and is defined by a third order polynomial.  T5 OFFSET = A (T1- Tref)3 + B (T1- Tref)2 + C (T1- Tref)  Tref is the match temperature of the engine and T1 is the measured air inlet temperature.  Effectively we are not controlling the temperature at Base T5, but at Base T5 + T5 Offset.  T5 Control Limit = T5 Base + T5 Compensation + T5 Offset  This is a graphical representation of Constant T3 Control.  The T5 Offset for a two shaft engine is zero below 59°F T1.  [attach]1[/attach]

Control Systems [Solved] What is Constant TRIT control and why is it used?

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