The invention relates to a hydraulic power-assisted steering system
comprising a steering gear and a hydraulic actuator for assisting
actuation of the steering wheel by the driver of a vehicle, in particular
a motor vehicle, comprising an electric motor which is coupled to the
steering column and used as an additional torque actuator for actively
applying an additional steering torque, also consisting of an electronic
control and regulating unit (ECU), which includes a determination unit
for determining a steering torque and an evaluating and selecting
circuit, by means of which a total value for applying the additional
steering torque is determined in consideration of the determined steering
torque or a quantity derived therefrom and a selected basic
characteristic curve of steering (basic characteristic curve), with the
total value of the additional steering torque to be applied including a
driver-dependent component and a driver-independent component.