Hitachi Astemo develops Steer-by-Wire prototype with advanced steering and fails… – Press Release

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TOKYO, Oct 3, 2022 – (JCN Newswire) – Hitachi Astemo, Ltd.has developed a Steer-by-Wire prototype for vehicles, which actuates the tires not mechanically, but through the electric control of steering wheel inputs. The prototype not only realizes smooth, effortless steering wheel operation, but also redundancy through a fail-safe function that enables the continued operation in the event of a failure.

Steer-by-Wire with redundancy

In anticipation of the evolution of autonomous driving, Hitachi Astemo and Hitachi, Ltd. are combining resources(1) to realize the practical application of a Steer-by-Wire that not only improves safety and comfort, but also realizes a greater degree of freedom in layout design, which is achieved by linking the steering system and wheel-turning system actuators using electrical signals.

Normally, the driver infers the road surface condition from the steering reaction force of the steering wheel and use that information in operating the vehicle. With Steer-by-Wire, Hitachi Astemo leverages the advanced steering feel technology developed through the former Showa Corporation’s many years of extensive research. In addition, Hitachi Astemo and Hitachi, Ltd. Research & Development Group have jointly developed a function that conveys when the vehicle body has not turned during inputs of the steering wheel. Furthermore, Hitachi Astemo is leveraging industry-leading skidding control technology developed by former Hitachi Automotive Systems, which suppresses external interference from road surface irregularities, such as wheel tracks on snowy roads, to minimize the need for steering corrections by the driver.

To address the concern of Steer-by-Wire functionality in the event of failure, Hitachi Astemo’s prototype has a failsafe function, which adopts a two-system approach for the power source and wire harness that connect the actuator on the steering side and actuator on the wheel turning side; triples both the circuits in the steering wheel angle…

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