Abstract: An ECU executes a program including the steps of: calculating regenerative power value P based on a brake pressure; calculating limit charging power WIN(B) to a battery; calculating limit charging power WIN(C) to a capacitor; when it is determined that regenerative power value P is larger than the sum of WIN(B) and WIN(C), estimating that a large regenerative energy sufficient to fully charge the capacitor even if the battery is charged with priority would be generated; and transmitting a control signal to set output voltage of a boost converter to be not higher than the voltage of the capacitor so as to charge the battery with priority.

Abstract: Disclosed is an electromotive power steering for a motor vehicle, in which a special type of reluctance motor or series wound motor is used while such an electric motor is electronically commutated. In order to recognize an error condition in the electronic control device and the electric motor, adequate mechanisms are provided in the circuit arrangement (15), the electric motor being cut from the power source by means of a relay (16) or by short-circuiting the power source downstream of a safety device (17) with the aid of a thyristor (18).