Computer system with inbuilt redundancy for safe operation - generates control signals for safety relevant drive of motor vehicle wheels based on combination of signals and outputs from redundancy sensors

摘要

A computer based control system has duplicated sensors (1,2 and 1R,2R) for built-in redundancy that provides inputs (e1-e2R) to the computer (20). The outputs from the redundant sensors are fed via delays units (6,7) to comparators (4,5). The computer supplies, together with the comparators, inputs of the drive stages (11-14) as well as a watchdog circuit (3). The drive stages supply a safety protected actuator (10) and outputs are fed back (S0-S2) to the computer. Outputs are produced as a function of the signals and the redundant values to improve the functional reliability of the system. USE/ADVANTAGE - Improved safety from dual channel computer system. Used in motor vehicle steering system where rear wheels are also steerable, allowing narrow curves to be negotiated and counteracts direction of skid.