Patent ID: 7251551

Claim:
An on-vehicle electronic control device, comprising: a nonvolatile program memory; a microprocessor which is connected to a first serial-parallel converter via a bus; a concurrent control circuit which is serially connected to the microprocessor via the first serial-parallel converter and a second serial-parallel converter, wherein the microprocessor and the concurrent control circuit function in cooperation to control an on-vehicle electric load group based on input signals from an on-vehicle sensor group and contents of the nonvolatile program memory; characterized in that the on-vehicle electronic control device further comprises: a watchdog timer into which a watchdog signal formed of a generated pulse train outputted by the microprocessor is inputted and which, when a pulse width of the watchdog signal is equal to or larger than a predetermined value, generates a reset pulse to reactivate the microprocessor; a nonvolatile collation information storage means that is connected to the concurrent control circuit via a bus and previously stores predetermined checksum external collation data; external checksum means for comparing current sum data that concerns data stored in the nonvolatile program memory and is transmitted to the concurrent control circuit from the microprocessor with the checksum external collation data that is previously stored in the collation information storage means, and generating an anomaly detection output when the current sum data does not coincide with the checksum external collation data; interval monitoring means for generating the anomaly detection output when a time interval for execution by the external checksum means exceeds a predetermined time; and load group stopping means for stopping a partial drive of the on-vehicle electric load group in response to the anomaly detection output from at least one of the external checksum means and the interval monitoring means.