System and method for reprogramming vehicle computers
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United States of America Patent
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-
Jan 11, 1994
Grant Date -
N/A
app pub date -
May 7, 1991
filing date -
May 7, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A system and method for reprogramming a non-volatile memory of one or more on-board vehicle computers through a serial communication link between an off-board controller and the on-board vehicle computer. An interface circuit is also provided on the vehicle in order to process the command signals from the portable controller which will enable the non-volatile memory to receive and store new computer program code. The method follows a predetermined transfer protocol which assists in preventing the existing computer program code stored in the non-volatile memory from being improperly erased or re-written. This transfer protocol includes the transmission of a command signal from the off-board controller which has a voltage level that exceeds the voltage level of any signal which may recognized on the serial communication link.
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