Method and equipment for estimating a braking factor for a braking system for a vehicle

Patent metadata

Field	Value
Publication number	US-12409836-B2
Application number	US-202118041273-A
Country	US
Kind code	B2
Filing date	Aug 19, 2021
Priority date	Sep 4, 2020
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

Method and equipment for estimating a braking factor for a braking system for a vehicle. The method includes estimating a braking factor (k brk ) for a braking system for a vehicle, in which the braking factor (k brk ) is by applying the following equation: k brk =a+b*v veh +c*p brk +d*T brk +f*p brk 2 , in which a, b, c, d and f are model parameters, v veh is a velocity of the vehicle, p brk is a braking pressure, and T brk is a brake temperature.

First claim

The invention claimed is:

1. A method comprising:
detecting, via a sensor, sensor data which includes a brake temperature;
a device receiving the sensor data from the sensor;
determining, via the device, an estimation of a braking factor (k brk ) according to:
k brk =a+b*v veh +c*p brk +d*T brk +f*p brk 2 ,
wherein a, b, c, d, and f are model parameters,
v veh is a velocity of a vehicle,
p brk is a braking pressure, and
T brk is the brake temperature;

determining an estimation of a braking torque (M brk ) from the braking factor (k brk ); and
applying the braking factor (k brk ) and/or the braking torque (M brk ) to an anti-lock braking system and/or electronic stability control system of the vehicle.

2. The method of claim 1 , wherein the model parameters a, b, c, d, and f are established by transferring experimental data into a braking factor model.

3. The method of claim 2 , wherein the experimental data is established by test-bench tests, during performance tests of braking pad and braking disk pairings.

4. The method of claim 2 , wherein the experimental data is established for tests wherein the braking pressure (p brk ) is equal to or greater than a predetermined threshold, a wheel velocity (v wheel ) is equal to or greater than a predetermined threshold, and a pressure changes (|Δp brk |) are equal to or less than a predetermined threshold, and/or the brake temperature (T brk ) is equal to or greater than a predetermined threshold.

5. The method of claim 2 , wherein the experimental data is established for tests wherein the braking pressure (p brk ) is equal to or greater than a predetermined threshold, which is equal to or greater than 0.05 bar, a wheel velocity (v wheel ) is equal to or greater than a predetermined threshold, which is equal to or greater than 1 km/h, and a pressure changes (|Δp brk |) are equal to or less than a predetermined threshold, which is equal to or less than 0.1 bar/s, and/or the brake temperature (T brk ) is equal to or greater than a predetermined threshold, which is equal to or greater than 200° C.

6. The method of claim 1 , wherein the model factors a, b, c, d, and f are established depending on respective material pairings of a braking pad and a braking disk.

7. The method of claim 1 , wherein the velocity of the vehicle (v veh ), the braking pressure (p brk ), or both are established as actual sensor data and/or control data.

8. A method comprising:
determining, via at least one or more sensors,
a velocity of a vehicle (v veh ),
a braking pressure (p brk ), and
a brake temperature (T brk );

a converter device receiving the velocity of the vehicle (v veh ), the braking pressure (p brk ), and the brake temperature (T brk ) from the one or more sensors;
determining, via the converter device, an estimated braking factor (k brk ), and an estimated braking torque (M brk ) according to:
M brk =k brk *p brk ;
wherein the estimated braking factor (k brk ) is according to:
k brk =a+b*v veh +c*p brk +d*T brk +f*p brk 2 ,
wherein a, b, c, d, and f are model parameters; and

applying the braking torque (M brk ) to an anti-lock braking system and/or electronic stability control system of the vehicle.

9. The method of claim 8 , wherein the estimated braking factor (k brk ) is determined by being calculated and/or by selecting stored estimated braking factors (k brk ) depending on an actual velocity of the vehicle (v veh ), the braking pressure (p brk ) and the brake temperature (T brk ).

10. The method of claim 8 , wherein the estimated braking torque (M brk ) is determined by being calculated and/or by selecting stored estimated braking torques (M brk ) depending on an actual velocity of the vehicle (v veh ), the braking pressure (p brk ) and the brake temperature (T brk ).

11. An apparatus for a braking system for a vehicle, comprising:
at least one signal inlet configured to receive sensor data, wherein the sensor data includes one or more of a velocity of the vehicle (v veh ), a braking pressure (p brk ), and a brake temperature (T brk );
a converter device that converts the received sensor data into an estimated braking factor (k brk ),
wherein the estimated braking factor (k brk ) is according to:
k brk =a+b*v veh +c*p brk +d*T brk +f*p brk 2 ,
wherein a, b, c, d, and f are model parameters; and

at least one signal outlet configured to transmit the estimated braking factor (k brk ) to an anti-lock braking system and/or electronic stability control system of the vehicle, wherein the anti-lock braking system and/or electronic stability control system is configured to apply the estimated braking factor (k brk ) thereto.

12. The apparatus of claim 11 , wherein the converter device is configured to calculate the estimated braking factor (k brk ) based on stored model parameters and received data values, and/or configured to select stored estimated braking factors (k brk ) depending on received data values.

13. The apparatus of claim 11 ,
wherein the converter device is configured to convert the estimated braking factor (k brk ) into an estimated braking torque (M brk ) as per M brk =k brk *p brk , wherein the at least one signal outlet is configured to transmit the estimated braking torque (M brk ) to the anti-lock braking system and/or electronic stability control system of the vehicle, wherein the anti-lock braking system and/or electronic stability control system is configured to apply the estimated braking torque (M brk ) thereto.

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh
• Knorr Bremse Systems Fuer Nutzfahrzeuge Gmbh

Inventors

• Sawodny Oliver
• Goeltz Simon
• Hecker Falk
• Guecker Ulrich
• Sauer Roman
• Mustapha Adnan

Classifications

• B60T8/172

  Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)} · CPC title

• B60T8/171 Primary

  Detecting parameters used in the regulation; Measuring values used in the regulation · CPC title

• B60W2520/28

  Wheel speed · CPC title

• B60W30/18109 Primary

  Braking · CPC title