A fail-safe interface for a by-wire vehicle control system merges driver commands and external commands developed by a by-wire control unit to form a failure-tolerant actuator command that never diminishes a driver command. External commands are passed through a fault detection circuit that filters out aberrant cyclical and constant command signals from the by-wire control unit, and the actuator command is determined according to the higher or maximum of the driver-generated and external commands. The interface is powered by vehicle power supply, and is electro-optically isolated from the external control unit so that if the external control unit loses power, the actuator command faithfully follows the driver command.
Failure-Tolerant By-Wire Actuator Interface
2021-09-02
Patent
Electronic Resource
English
IPC: | H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION , Übertragung digitaler Information, z.B. Telegrafieverkehr / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion |