COMMUNICATION LINE FAILURE DETECTION DEVICE BETWEEN ELECTRONIC CONTROLLERS

摘要

PURPOSE: To carry out highly reliable detection of a failure of communication lines by judging that the communication lines are in failure when one of first and second electronic controllers transmits a specified signal to the other electronic controller at the predetermined timing when an idle signal is switched to ON and the signal received by the other electronic controller differs from the specified signal. ;CONSTITUTION: An engine control computer 7 (E/G ECU) of an engine 1 and an automatic transmission control computer 8 (ECT ECU) of an automatic transmission 2 mutually transmit delayed angle demand amount data and throttle opening degree data by communication lines ESA1 to EST3, L so as to make speed change shock reduction control. The E/G ECU7 reads data transmitted from the ECT ECU8 via each communication line of ESA1 to ESA3 when the predetermined period of time passes after an idle signal has bee changed over from OFF to ON. When a signal which is not LO signal is included in the data, failure detection device judged that a failure has occurred in any of the communication lines ESA1 to ESA3.;COPYRIGHT: (C)1994,JPO&Japio