Measurement of Driver Torque and Steering Angle in a Torque Overlay Steering System

A method for determining a driver torque of a power steering assembly for an electrohydraulic power steering system of a motor vehicle, comprising:

• providing the power steering assembly with an input shaft for introducing the driver torque, an output shaft for driving a steering linkage and a torsion bar between the input shaft and the output shaft for actuating a rotary slide valve, an electric drive for electrical steering assistance, and a control unit for controlling the electric drive;
• determining, via a sensor arrangement of the power steering assembly, an actual torque using the torsion bar for actuating the rotary slide valve;
• and
• determining, via the control unit, the driver torque based on the actual torque.

A power steering assembly for an electrohydraulic power steering system of motor vehicle, comprising:

• an input shaft for introducing a driver torque;
• an output shaft for driving a steering linkage and a torsion bar between the input shaft and the output shaft for actuating a rotary slide valve;
• an electric drive for electrical steering assistance;
• a control unit for controlling the electric drive;
• and
• a sensor arrangement which is configured to determine an actual torque with the aid of the torsion bar for actuating the rotary slide valve, wherein the control unit is configured to determine a driver torque based on the actual torque.