Boots – shoes – and leggings
Patent
1994-10-04
1995-08-22
Kriess, Kevin A.
Boots, shoes, and leggings
3649751, 3649752, 364DIG2, G06F 1516, G06F 906, G06F 924
Patent
active
054448611
ABSTRACT:
An improved system is disclosed for downloading, verifying, and/or testing software from a remote programmer to an Electronic Engine Control ("E.E.C.") unit on a gas turbine engine. The invention includes a remote programmer that communicates with the E.E.C. unit through a serial communications link. The E.E.C. unit receives the communications through a serial memory that transmits them to a shared memory and on through a central processing unit ("C.P.U.") to a program memory. A redundant control circuit is controlled by the remote programmer and directs the E.E.C. unit through three operational modes. In a first, or download/verify, mode of operation, the E.E.C. unit may receive and store a boot program. In a second, or program memory, mode, the C.P.U. executes the boot program to allow the C.P.U. to read from and/or write to the program memory in response to communications from the serial channel. In a third, or normal, mode of operation, the C.P.U. can only read from the program memory and an on-board or host computer may replace the remote programmer, so that the C.P.U. executes software stored in the program memory in response to communications received from the host computer to control multiple actuators on the engines, but the host computer cannot access the E.E.C. unit's program memory.
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Adamec William B.
Cox Robert E.
Gigandet Scott A.
Chisholm, Jr. Malcolm J.
Kriess Kevin A.
Richey Michael T.
United Technologies Corporation
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