METHOD OF DEVELOPING ICE CONTROL UNIT SOFTWARE Russian patent published in 2009 - IPC G06F9/455 G11C29/52 G06F9/44 

FIELD: engines and pumps.

SUBSTANCE: invention can be used to protect software of the ICE control unit against unauthorised changing. Proposed method of developing software of the running ICE control unit consists in rewriting the software of the ICE control unit into external two-port RAM, restarting ICE, specifying the software data array including calibration tables and constants for ICE running under various operating conditions. The data made more specific is entered into aforesaid two-port external RAM. The development made, the improved software is written into ERPOM of the ICE control unit microcontroller. Note here that, prior to starting ICE, software is divided into an executable code and data array including calibration tables and constants and rewritten into the said two-port RAM. The executable code is written into EPROM, reading out from EPROM is locked by program means. Finally, the data array with calibration tables and constants is changed. The changed data addresses are added to said executable code. Now, improved software is written into EPROM of the ICE control unit microcontroller and reading out from EPROM is locked by program means.

EFFECT: improved software protection.

2 cl, 1 dwg