Method and system for controlling an electromechanically actuated brake for motor vehicles

A system including an electric motor and a drive mechanism positioned downstream of the electric motor for controlling a brake actuated by an electric motor, the system comprising:

• an actuating force control module (1) which receives a difference value indicative of a value between the difference of a desired value and an actual value of an actuating force (FBet,Soll) as an input value and generates a set value (Iq,Soll) of a torque-producing current;
• and
• a calculating module (2) which receives the desired and actual values of the actuating force (FBet,Soll, FBet,Ist), a set value of an actuating force gradient (FBet,Soll), and signals representing an actual value (ωMot,Ist) of a position of the electric motor and the actual value (ωMot,Ist) of a motor speed, wherein the calculating module generates a set value (Id,Soll) of a field-weakening current,
• wherein the set values of the torque-producing current and the field-weakening current as well as the signal representing the actual value (ωMot,Ist) of the motor position are converted by an electronic current control (3) to a signal (UMot) that represents the voltage to be applied to the electric motor (4).

A method of controlling a brake assembly actuated electromechanically by an actuator, the brake assembly including an electric motor and a drive mechanism positioned downstream the electric motor, the method comprising:

• providing an actuating force controller to receive an input value representative of a difference value indicative of a value between the difference of a desired value and an actual value of an actuating force and to generate a set value therefrom;
• providing a pre-control module connected and parallel to the actuating force controller, the pre-controller module being configured to receive the actual value of the actuating force and a set value of an actuating force gradient as input values, the pre-control module being configured to provide an additional set value of a motor speed and an additional set value of a torque-producing current as corresponding output values;
• adding the additional set value of the motor speed to the set value of the motor speed;
• supplying an ensuing difference to a speed controller to generate a controlled set value of the torque-producing current therefrom;
• adding the additional set value of the torque-producing current;
• with a calculating module, receiving the desired and actual values of the actuating force, the set value of the actuating force gradient, signals representing an actual value of a motor position, and an actual value of the motor speed;
• generating a set value of a field-weakening current on the bases of the values received by the calculating module;
• and
• converting the set values of the torque-producing current, the set values of the field-weakening current, and the signals representing the actual value of the motor position to an electronic current control signal representing the voltage to be applied to the electric motor.

A system including an electric motor and a drive mechanism positioned downstream of the electric motor for controlling a brake actuated electromechanically by means of an actuator, the system comprising:

• an actuating force controller (14) to receive a difference value (ΔFBet) indicative of a value difference between a desired value and a current value of an actuating force (FBet,Soll, FBet,Ist), the actuating force controller (14) being configured to generate a set value (ωMot,Soll) of a motor speed and to compare the set value to an actual value (ωMot,Ist) of the motor speed so that an ensuing difference (ΔωMot) is supplied to a speed controller (15), which generates a set value (Iq,Soll) of a torque-producing current;
• and
• a calculating module (2) to receive the desired value and the current value of the actuating force (FBet,Soll, FBet,Ist), a set value of an actuating force gradient (FBet,Soll) from an operating element, signals representing an actual value (ωMot,Ist) of a motor position from a position measuring system (6) and the actual value (ωMot,Ist) of the motor speed from a force measuring element (7) to generate a set value (Id,Soll) of a field-weakening current so that the set values (Iq,Soll, Id,Soll) of the torque-producing current and the field-weakening current as well as the signal representing the actual value (ωMot,Ist) of the motor position are converted in an electronic current control (3) to a signal (UMot) representing voltage to be applied to an electric motor (4).