Patent US 4,355,360

According to the method, a plurality of sensor signals are generated related to vehicle operating parameters. Interruption signals are produced in response to certain sensor signals and cause execution of a main control program to be interrupted. Data related to the main control program are transferred to an auxiliary memory. An interruption processing program is executed in a non-interruptible state to determine the source of the interruption signal, after which an interruption program related to the received interruption signal is executed. The interruption program is interrupted in response to each additional interruption signal and data related to the interrupted interruption program is stored in an auxiliary memory. The interruption processing program is then re-executed and a FLAG is stored identifying the interruption program related to each additional interruption signal. Execution of the interruption program related to the first interruption signal is then continued and followed by execution of interruption programs related to the additional interruption signals in an order determined by the stored FLAGs.