The steering system supports the driver in turning the steering wheel with an electric power assist unit consisting of a motor, controller, torque sensor and so on, thereby steering the tire.
In comparison with the hydraulic type that uses the engine of the vehicle as a power source, the electric type that uses the battery as a power source can improve the fuel consumption of the vehicle by 3% to 5%.
There are two types: column type with which the power assist unit is located in the column (inside the cabin) and rack type with which it is located in the engine room.
