Bosch Huayu Steering Systems (BHSS) Steering Solution · Evolution Path

Power Steering Column (Stowable) – Advantages

Equipped with a Welcome and Yielding Function, it enhances the convenience of entering/exiting the cockpit, optimizes space utilization in non-driving states, and supports multi-scenario cockpit reconfiguration.
Features a Multi-position memory function that collaborates with seats, air conditioning, and entertainment systems via the CAN network to elevate the personalized cockpit experience.
With a long stroke design, the steering wheel is fully retractable, creating new cockpit scenarios and interaction possibilities—ideal for SAE L4 and scenarios.

Basic Design Performance Parameters
Radial Adj. Range	±2.5°
Axial Adj. Range	+35mm, -270mm
Total Length (Design)	≤700mm
Radial Adj. Speed	11~15mm/s
Axial Adj. Speed	≥30mm/s
Crash Range	≥80mm
Natural Frequency	≥50Hz
Static Stiffness (V/L)	vertical ≥ 200N/mm lateral ≥ 200N/mm
Retention Force (A/R)	axial: ≥1200N radial: ≥1200N
Operating Noise (RT)	< 39dB
Weight (excl. FFU)	< 6.5kg

SbW – Advantages

Software-defined and unified control enables a flexible adjustment of both steering ratio and force feedback characteristics via software parameters, significantly simplifying engineering adaptation work.
Enhance Flexibility in steering wheel layout on the vehicle cabin structure, creating conditions for flexible adaptation to cockpit interface layout adjustments in different markets globally.
The steering wheel silence and stowable features create new cockpit scenarios and interaction possibilities for OEMs-providing a more immersive cockpit experience in autonomous driving mode and revolutionizing interior space layout.

SbW Safety – Redundant and Precise
Functional Safety	9 Functional Safety Goals Prevent self-steering while driving Prevent loss of steerability while driving Prevent loss of feedback torque to the driver while driving Prevent un-intended blocking of the steering wheel while driving Prevent un-intended asynchrony between steering wheel angle and road wheel angle Prevent un-intended oscillation Prevent reporting a wrong health state Prevent reporting wrong torsion bar torque information Prevent reporting wrong steering angle information
Safety Of The Intended Functionality	For Safety of the Intended Functionality (SOTIF), the Monte Carlo simulation method ensures functional reliability and safety under various operating conditions and parameter combinations throughout the full lifecycle.
Heterogeneous Redundancy	RWS act as a redundant backup for SbW through assist in completing the steering in failure emergencies and helping to find a safe position to pull over.

4 Wheels Coordination – Reversed Direction as Front Wheel

4 Wheels Coordination – Same Direction as Front Wheel

Reduction of yaw rate gain, mitigation of transient vehicle spin around the CoG, and improvement of lateral dynamics limits
Mitigate centrifugal effects, and improve passenger’s comfort during high-speed steering

Rear Wheel Steering (RWS) Control Logic

Aiming at the objectives of zero center-of-mass (CM) sideslip angle and tracking the desired yaw rate, a closed-loop speed-dependent rear-wheel steering control is implemented by integrating the full-vehicle dynamics model.
Combining the coordinated control of functions such as ABS/ESB, under the condition of having a rear wheel steering angle and a speed difference between two wheels, enables more diverse vehicle motion actions.

Basic Design Performance Parameters
Driving Rack Force	15kN @ 20mm/s
ECU	CSER B3+
Motor	M85 (8.5Nm)
Busbar Current	160A max
Lead Screw Stroke	±30 mm (Expandable)
Applicable Temperature Range	-40~125°C
Applicable Voltage Range	6.5~18V
Sealing Class	IP6K9K, IPX7