Optimization of the Differential Compound Engine Using Microprocessor Control

The paper describes further work on the differential compound engine (DCE) which, following earlier theoretical work on the feasibility of multi-variable control is now being converted to microprocessor controlled continuous optimization for minimum fuel consumption for any demanded combination of output shaft conditions. The controlled variables on this integrated compounded engine transmission system include:

1. i)
   engine governor set point
2. ii)
   geared turbine nozzle angle
3. iii)
   engine bypass setting
   and, additionally, in a system yet to be developed, but already theoretically investigated, fuel injection timing and duration.

The paper describes the experimental and analytical procedures, using a programmable high response hydrostatic dynamometer, for establishing the 3-dimensional control surfaces for the above 3 variables, and the subsequent implementation of a microprocessor controlled system.