A method for estimating the braking force that can be applied between the pad and the brake disc by the vehicle's electric parking braking system, and the vehicle's electric parking braking system implementing the method

摘要

A method of estimating a braking force that can be applied between a pad and a brake disc by an electric parking brake system of a vehicle, the vehicle comprising: at least one first moving member; A first brake disc mounted on the at least one first moving member; And a first brake caliper operatively associated with the first brake disc, wherein the first brake caliper comprises a first pair of pads configured to operate to apply a braking force to the first brake disc. The system is operable to push the first pair of pads of the first brake caliper to apply a braking force between the first pair of pads of the first brake caliper and the first brake disc. A first piston operatively connected to the first pad of the first pair of pads of the brake caliper; The electric motor operatively connected to the first piston by an electromechanical mechanism configured to convert the rotational movement of the electric motor into a linear movement of the first piston; A data processing unit operatively connected to the actuator of the electric motor; And one or more sensors operatively connected to the data processing unit to detect the amount of electricity in the electric motor. The method 200 comprises: a moment of voltage (i (t)) supplied to the electric motor and voltage supplied to the electric motor during the parking braking operation, by one or more sensors of the electric amount of the electric motor. Step 201 of detecting a value, wherein the parking braking operation comprises: a first time instant indicating the start of the parking braking operation, and a first pad and the first of the first pair of pads of the first brake caliper. A first non-contact stage between the first pair of pads of the first brake caliper and the first brake disc, between a second time instant indicating the start of contact between one brake disc, and the parking The braking action is between the second time instant and a third time instant indicating the end of the parking braking action, the first pair of pads of the first brake caliper and the first A second contact stage between brake discs, further comprising a set additional time moment defined in the second contact stage F2 between the second time moment and the third time moment; The data processing unit determines an instantaneous braking force value at an estimated time instant, starting from the set additional time instant, the current (i (t)) detected between the second time instant and the estimated time instant and the And determining based on the voltage (v (t)) detected between the second time instant and the estimated time instant.