Advanced Digital Controller Development Program, Task I.
Interim rept. 1 Sep 79-30 Sep 80,
GENERAL MOTORS CORP INDIANAPOLIS IN DETROIT DIESEL ALLISON DIV
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The objective of this program phase was to develop the specification for a digital controller. This controller would have sufficient computing and IO capability to control a variable cycle VCE single spool e.g. GMA 200 ATEGG or two spool e.g. GMA200 JTDE configuration. Provision has been made for seven controlled variables. These are two fuel flows, variable compressor and turbine geometry, two cooling bleed flows, and variable nozzle area. A multivariate control logic structure was selected. Power commands, mode, and ambient conditions are used to estimate the equilibrium operating point. These schedules will then be adjusted to match the engine characteristics using an adpative control algorithm. Optimal paths between operating points will be computed by a trajectory generator module. A proportional regulator is designed to track small perturbation from this nominal path. The design concept for a digital controller capable of implementing this control logic was developed. This required a specification of the GMA200 fuel control system with particular emphasis on the controller interface. Trade studies were identified and their impact on the control hardware presented. These included actuator selection, fuel system selection, and airflow measurement techniques. Timing and sizing studies were completed. This resulted in the selection of a bit-slice processor an Am 2901 with 28K EPROMRAM.
- Computer Programming and Software
- Computer Hardware
- Jet and Gas Turbine Engines