Electromechanical Power Steering (EPS): Notes

The electromechanical power steering (EPS) differs from conventional hydraulic steering in that it has steering servo. The EPS supports the driver using an electrical servomotor instead of a hydraulic electric motor. The servomotor is only active when the vehicle is being steered. This means that the servomotor consumes no power during straight-ahead driving. Electromechanical power steering offers the following advantages:

• lower steering forces on parking
• integrated, driving-speed-dependent steering servo (Servotronic)
• lower bumpiness when cornering as well as lower steering wheel vibrations
• active steering wheel return
• saves up to 0.3 l of fuel per 100 km, thus reducing CO₂ emissions
• no hydraulic fluid necessary

The electromechanical power steering is available in the following equipment specifications: 

1. electromechanical power steering (EPS): voltage supply with 12 V  (as before)
2. electromechanical power steering (EPS) with Integral Active Steering (AL) and a defined combination of engine and transmission: Voltage supply with 12 V  via jump start terminal point in engine compartment
3. Electromechanical power steering (EPS) with Integral Active Steering (AL) and a defined combination of engine and transmission (weight on front axle): Voltage supply with 24 V  via auxiliary battery, cut-off relay and charging controller for auxiliary battery with DC/DC converter

Shown here: electromechanical power steering with active steering

Item	Explanation
1	Steering box
2	Steering-torque sensor
3	EPS control unit
4	Servomotor with integrated rotor position sensor
5	EPS unit