Fail-operational EPS for 24V commercial vehicles

EHPS system with active lane following represents the current level of truck automation. ECU2 controls a three-phase motor, M2, acting directly on the steering wheel, shaft to provide the torque overlay for system functions such as lane keep assist, lane centering function or lane-keep steering function.
ECU1 and the three-phase motor, M1, drive the hydraulic pump, replacing the traditional belt drive from the engine. The oil pressure is maintained by an accumulator, which smooths the peak demand so that the motor M1 needs only a relatively low power rating of about 500 W. The Sensors, provide data on actual steering wheel position and torque, vehicle speed, and data from cameras to the ECU, are all connected by CAN bus.

• Powerful, scalable, small footprint
• Proven interoperability
• Support of nx3 phase-based fail-safe and fail-operational EPS systems
• Aligned safety concept focused on power supply and microcontroller
• Adaptable via software to suit a range of car models and driving modes
• Upgradable to meet future requirements, such as steer-by-wire for automated driving

A less complex solution can be realized by a basic EHPS solution or an EPS with active steering for 24V commercial vehicles.

This whitepaper will introduce the major trends for the commercial, construction, and agricultural vehicles (CAV) vehicles. Infineon’s solutions for fuel efficiency, lower emissions, safety, and connectivity will revolutionize the automated driving market.

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