A method for ascertaining an operating variable of a drum brake, the method using forces acting on supporting bearings. The invention further relates to an associated drum brake assembly, an associated analysis unit and an associated storage medium.

A brake control unit (50) is provided comprising a primary control branch (510), a backup control branch (520), and mode control utilities (530), wherein the mode control utilities (530) are configured to select in accordance with integrity diagnostic indications an operational mode of the brake control unit from a plurality of potential operational modes comprising at least a normal operational mode and a degraded operational mode, wherein respectively the primary control branch (510) and the backup control branch (520) are configured to generate a brake motor drive signal (D.sub.10, D.sub.20) with their respective inverter being controlled by their respective control module in response to an external brake control signal (I.sub.B), wherein the primary control module (511) is configured to provide the integrity diagnostic indications in that it includes at least a first and a second mutually cooperating primary control component (511A, 511B) that are configured to diagnose (QA) each other's integrity status, and in that it is further configured to diagnose an integrity status of the backup control branch (520) by verifying a response signal (S.sub.R) of the backup control branch in response to a test signal (S.sub.T).

A method for determining an operating variable of a drum brake comprises actuating the brake in at least one of: a first wheel speed range and a second wheel speed range. The operating variable is calculated based on bearing force of a leading brake shoe and the further bearing force of a trailing brake shoe when in the first wheel speed range. The operating variable is calculated when in the second wheel speed range based on a current actuator position and an actuator contact position, in which brake shoes of the drum brake come into engagement with a drum of the drum brake.

A method for ascertaining an operating variable of a drum brake, the method using forces acting on supporting bearings. The invention further relates to an associated drum brake assembly, an associated analysis unit and an associated storage medium.

Method and apparatus are disclosed for a traction and stability control system. An example vehicle includes wheel speed sensors on wheels of the vehicle and a traction control module. The example traction control module determines, based on measurements of the wheel speed sensors or a transmission control module, whether the vehicle is likely stuck. Additionally, when the vehicle is likely stuck and an indication to disable the a traction control system has been received, the example traction control module disables the traction control system.

Method and apparatus are disclosed for a traction and stability control system. An example vehicle includes wheel speed sensors on wheels of the vehicle and a traction control module. The example traction control module determines, based on measurements of the wheel speed sensors or a transmission control module, whether the vehicle is likely stuck. Additionally, when the vehicle is likely stuck and an indication to disable the a traction control system has been received, the example traction control module disables the traction control system

A method for determining an operating variable of a drum brake comprises actuating the brake in at least one of: a first wheel speed range and a second wheel speed range. The operating variable is calculated based on bearing force of a leading brake shoe and the further bearing force of a trailing brake shoe when in the first wheel speed range. The operating variable is calculated when in the second wheel speed range based on a current actuator position and an actuator contact position, in which brake shoes of the drum brake come into engagement with a drum of the drum brake.