EPS System Description - Overview
System Outline
This vehicle is equipped with electrical power steering (EPS). The driver's steering force is assisted by an electric motor at the steering column. Compared to a hydraulic assist power steering system, EPS is more efficient because it does not need an engine driven oil pump to generate hydraulic pressure.
The EPS control unit monitors and controls the EPS motor's assisting force to match driving conditions.
- Low vehicle speeds: High power assist (for easy handling)
- High speed driving: Low power assist (for stable driving)
- Low speed to high speed driving: Change smoothly from high assist to low assist
Components
The EPS system mainly consists of the following parts:
- The EPS control unit: Control the EPS motor
- The EPS motor: Generate the assisting torque
- The torque sensor: Measure the steering force applied to the steering wheel
- The steering gearbox: Transmit the steering force
The EPS control unit, the EPS motor, the torque sensor are combined into the steering column.