Vehicle electronics system including a parking brake equipment
A vehicle electronic system including a parking brake equipment, comprising a brake element ( 2 ) including either a brake pad or a brake shoe, said brake element ( 2 ) including an electrical circuit equipped with one or more sensors ( 3, 4, 5 ) for real-time detection of signals relating to temperatures and/or to normal forces and/or to shear forces and having electrical terminals arranged in a zone for collecting the signals from the brake element, said vehicle electronic parking brake system further comprising an actuator ( 8 ) of the brake element ( 2 ), a controller ( 7 ) delivering a braking force command to the actuator ( 8 ), and regulating means ( 9, 10 ) driving the controller ( 7 ), wherein the regulating means ( 9, 10 ) include a closed regulating loop of the braking force including a reference braking force generator ( 10 ), said closed regulating loop of the braking force being communicating with said sensors ( 3, 4, 5 ) to acquire at least one of temperatures and/or normal forces and/or shear forces measurements.
1 . A vehicle electronic system including a parking brake equipment comprising:
a brake element including either a brake pad or a brake shoe, the brake element including an electrical circuit equipped with one or more normal force sensors, one or more shear force sensors, or both, for real-time generation of at least normal force measurements, shear force measurements, or both, and having electrical terminals arranged in a zone for collecting the measurements from the brake element;
an actuator of the brake element;
a controller configured to deliver a braking force command to the actuator; and
a regulating apparatus configured to drive the controller, wherein the regulating apparatus comprises a closed regulating loop of braking force, the closed regulating loop including at least one of a generator or a state observer, wherein the generator generates at least one of a reference braking force value or a reference braking torque value;
wherein closed regulating loop of the braking force communicates with the one or more normal force sensors, the one or more shear force sensors, or both, to acquire at least normal force measurements, shear force measurements, or both.
2 . A vehicle electronic system including a parking brake equipment according to claim 1 , wherein the closed regulating loop of the braking force further includes a node comparator configured to compare measured values of at least one of normal forces, shear forces, or a torque value derived from the shear forces with at least one of the reference braking force value or the reference braking torque value.
3 . A vehicle electronic system including a parking brake equipment according to claim 2 , wherein at least one of the reference braking force value or the reference braking torque value is fixed.
4 . A vehicle electronic system including a parking brake equipment according to claim 2 , wherein at least one of the reference braking force value or the reference braking torque value is variable.
5 . A vehicle electronic system including a parking brake equipment system according to claim 2 , wherein the state observer generates at least one of the reference braking force value or the reference braking torque value.
6 . A vehicle electronic system including a parking brake equipment according to claim 2 , wherein at least one of the reference braking force value or the reference braking torque value is determined based at least in part on at least one of normal forces, shear forces, or torque value.
7 . A vehicle electronic system including a parking brake equipment according to claim 2 , wherein the brake element comprises one or more temperature sensors, and wherein at least one of the reference braking force value or the reference braking torque value is determined based on temperature measurements acquired from the one or more temperature sensors.
8 . A vehicle electronic system including a parking brake equipment according to claim 1 , further comprising at least one of an accelerometer or an inclinometer, wherein the closed regulating loop of the braking force communicates with at least one of the accelerometer or inclinometer to acquire measurements.
9 . A vehicle electronic system including a parking brake equipment according to claim 8 , wherein at least one of the reference braking force value or the reference braking torque value is determined based at least in part on the measurements acquired from at least one of the accelerometer or inclinometer.
10 . A vehicle electronic system including a parking brake equipment according to claim 1 , wherein the one or more normal force sensors and the one or more shear force sensors are piezoceramic sensors.
11 . A vehicle including the vehicle electronic system including a parking brake equipment according to claim 1 .
12 . A method of clamping a wheel of a vehicle with a vehicle electronic system including a parking brake equipment, wherein the method includes compensating braking force variation by:
processing, with a regulating apparatus of a parking brake equipment configured to drive a controller of the parking brake equipment, at least one of normal force or shear force measurements acquired from one or more normal force sensors, one or more shear force sensors, or both, to determine at least one of a reference braking force value or a reference braking torque value, wherein the regulating apparatus comprises a closed regulating loop of braking force;
processing, with the regulating apparatus, the at least one of normal force or shear force measurements in combination with at least one of the reference braking force value, the reference braking torque value, a fixed reference braking force, or torque value to drive the controller; and
with the controller, transmitting to an actuator of the parking brake equipment a braking force command.
13 . A method according to claim 12 , further comprising, processing measurements acquired from at least one of an accelerometer or an inclinometer with a generator of the regulating apparatus to determine at least one of the reference braking force value or reference braking torque value, wherein the generator generates at least one of the reference braking force value or the reference braking torque value.
14 . A method according to claim 12 , wherein the at least one of normal force or shear force measurements are processed real time.
15 . A method according to claim 12 , further comprising detecting parking brake equipment failure in activation or deactivation by a consistency check between the at least one of the reference braking force value or reference braking torque value and the at least one of normal force or shear force measurements.
16 . A method according to claim 12 , further comprising, processing measurements acquired from at one or more temperature sensors with a generator of the regulating apparatus to determine at least one of the reference braking force value or reference braking torque value, wherein the generator generates at least one of the reference braking force value or reference braking torque value.