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Our ground-breaking CS1 steering actuator is designed from the ground-up specifically for use in autonomously driven vehicles. The CS1 employs a unique mechanical, electrical and software architecture to ensure continued steering system capability even in the event of a single point of failure (sensor, power, communication or other fault). The system ensures that the vehicle can always maintain directional control and that the primary safety goal is met, exceeding the requirements for ASIL-D, in accordance with the automotive functional safety standard ISO 26262.
CS1 comprises an advanced duplex architecture with dual controllers, an array of sensors and twin sub-actuators to create the axial load to steer the vehicle. During normal operation, the steering load is split between the two sub-actuators, however, in the event of a vehicle or system fault, the impacted sub-actuator fails silent and the remaining sub-actuator takes over full control.
The advanced control software self-diagnoses faults and reverts to the alternative operating mode within a defined FTTI (fault-tolerant time interval) to maintain normal steering function. CS1 is therefore the world’s first fail-operational steering system. The vehicle can continue to operate normally regardless of a single point failure occurring within the system or at the vehicle level.
The system has been developed by automotive industry experts from steering, braking, functional safety, systems engineering and electronics backgrounds. It is a unique concept (with several pending patents) designed specifically for use in autonomously driven vehicles. Traditional rack and pinion; and parallel axis, belt driven technologies are eliminated in this ground-up design.
Chassis Autonomy SBA AB
Trollhättan, Sweden
Chassis Autonomy Limited
London, United Kingdom
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CHASSIS AUTONOMY is a registered trademark owned by Chassis Autonomy SBA AB, Sweden, 2023.