ARTC provides the techniques of developing 48V Electric Power Steering (EPS) system prototype, which includes the assist motor, the torque sensor, the electronic control unit (ECU). Based on the torque sensor signal, the ECU calculates the required assistance torque and controls the assist motor to achieve a demand driven operation. The developed ECU prototype consists of a microcontroller unit (MCU), 48V MOSFET converter, Driver IC, and other components to control a permanent magnet synchronous 3 phase motor (PMSM); the MCU performs the field oriented space vector control algorithm and the steering control logics to provide the steering assistance.

Rated voltage: 48V
Rated current: 30A
Control frequency: 20kHz
Sinusoidal commutation: Field oriented , space vector pulse-width-modulation control
Control Logic: Basic assistance, damp, return, inertia and impact compensation control 
 

The 48V EPS can be used in electric vehicles (EV), hybrid vehicles (HEV), and other automobiles which need power steering assistance.

ARTC has established EPS technologies which include system integration, design and development of electronic control units, system control logic design, etc. The establishment can make domestic component manufacturers have capabilities of system integration and master the 48V EPS system technology in early preparation for the upward trend of EV and HEV.