Ricardo UK Limited

Michael John Lindsey

Peter John Miller

Andrew Charles Osborne Smith

Robert John Barnes

David John Allen

Graham Ludar-Smith

An electronic system comprising a system to be monitored () and a plurality of fault-monitoring systems () each of which is adapted to output a fault signal when an input indicates that the electronic system is in a fault condition associated with the fault-monitoring system. The fault-monitoring systems are arranged in a cascade fashion such that a fault signal output from one fault-monitoring system () is provided as an input to a subsequent fault-monitoring system () in the cascade of fault-monitoring systems to simulate a fault condition associated with the subsequent fault-monitoring system. The output of the final fault-monitoring system in the cascade gives an indication of whether there is a fault with any of the fault-monitoring systems.

Self-test system

A control system for a load (), the system comprising a first microprocessor () having an output to drive one side of a load (), a second microprocessor () having an output to drive the other side of the load (), the system being arranged so that when either microprocessor detects a fault in the control of the load () the load () is switched off.

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Dorset, United Kingdom

Michael John Lindsey