Method for detecting a brake pedal actuation of a brake pedal by a driver during an initialisation of an actuator and method for initialising an actuator of a brake system

Patent metadata

Field	Value
Publication number	US-12415495-B2
Application number	US-202217974222-A
Country	US
Kind code	B2
Filing date	Oct 26, 2022
Priority date	Oct 27, 2021
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

A method for detecting a brake pedal actuation of a brake pedal by a driver during an initialization of an actuator, of a brake system, in which, during operation, an initialization operation and/or a system initialisation, of the actuator, a dynamic, position analysis of a pedal position and/or of a pedal travel of the brake pedal and/or of an input piston, which is coupled and/or couplable to the brake pedal, takes place, and method for initialising an actuator, a computer program product, control unit or system comprising a plurality of control units and a corresponding device.

First claim

The invention claimed is:

1. A method for detecting an unintended brake pedal actuation of a brake pedal by a driver during an initialization of an actuator of a brake system for performing a sensor-offset calibration, in which, during operation, of the actuator a position analysis of a pedal position and/or of a pedal travel of the brake pedal and/or of an input piston takes place, the method comprising: controlling the actuator to displace an actuating element from a rear end position toward a front end position, the rear end position proximal relative to the brake pedal and the front end position distal proximal relative to the brake pedal; establishing a start value of the pedal position when the actuating element couples with the brake pedal; comparing the pedal position to a first threshold value and a difference between the pedal position and an actuator position to a second threshold value; detecting the brake pedal actuation if either threshold value is exceeded; and selecting between current offset values or previously recorded offset values for the sensor-offset calibration based on whether the brake pedal actuation is detected.

2. The method according to claim 1 , wherein a pedal travel sensor signal is received, and/or recorded by a pedal travel sensor, wherein the pedal position and/or the pedal travel is established on the basis of the pedal travel sensor signal.

3. The method according to claim 2 , wherein a position of an actuating element, of the actuator is established.

4. The method according to claim 3 , wherein a motor position signal of a motor of the actuator is received and/or recorded by a motor position sensor, wherein the position the actuating element of the actuator is established on the basis of the motor position signal.

5. The method according to claim 4 , wherein the actuator, is controlled in such a way that the actuating element of the actuator is displaced into a rear end position.

6. The method according to claim 5 , wherein the actuator is controlled in such a way that the actuating element is displaced from a rear end position in the direction of a front end position.

7. The method according to claim 6 wherein, after overcoming a travel distance the brake pedal and/or the input piston, which is coupled and/or couplable to the brake pedal, is displaced in the direction of the front end position, by coupling the actuating element of the actuator of a housing element which is coupled to the actuating element, to the brake pedal and/or input piston in a coupling position, wherein, at the point in time of the coupling, in the coupling position, of the actuating element and/or the housing element to the brake pedal and/or input piston, an increasing pedal travel sensor signal is recorded and/or the current pedal position and/or the current pedal travel is established and/or stored as a start value.

8. The method according to claim 7 , wherein, if the first threshold value has been exceeded, the motor of the actuator is stopped and/or the actuating element of the actuator and the housing element are pushed back in the direction of the rear end position by a spring force wherein the motor of the actuator is controlled in such a way that the coupling between the actuating element of the actuator and the housing element still exists.

9. The method for initializing an actuator of a brake system of a motor vehicle, wherein, during the initialization of the actuator, it is detected whether or not a brake pedal actuation of a brake pedal takes place as a result of a driver, wherein the detection of the brake pedal actuation according to the method takes place according to claim 1 .

10. The method according to claim 9 , wherein, if a brake pedal actuation was not detected, an offset calibration and/or offset correction of the pedal travel sensor signal or of the pedal position and/or of the pedal travel, and/or an offset calibration and/or offset correction of the motor position signal or of the position and/or of the travel of the actuating element of the actuator and/or of the housing element, takes place on the basis of currently recorded offset values.

11. The method according to claim 10 , wherein, if a brake pedal actuation was detected, an offset calibration and/or offset correction of the pedal travel sensor signal or of the pedal position and/or of the pedal travel, and/or an offset calibration and/or offset correction of the motor position signal or of the position and/or of the travel of the actuating element of the actuator and/or of the housing element, takes place on the basis of offset values recorded during a previous initialization.

12. A system comprising:
a memory configured to store computer-executable instructions;
a processor configured to execute the computer-executable instructions to cause the processor to:
detect an unintended brake pedal actuation of a brake pedal by a driver during an initialization of an actuator of a brake system, in which, during operation of the actuator, a dynamic position analysis of a pedal position and/or of a pedal travel of the brake pedal and/or of an input piston takes place by:
controlling the actuator to displace an actuating element from a rear end position toward a front end position, the rear end position proximal relative to the brake pedal and the front end position distal proximal relative to the brake pedal;
establishing a start value of the pedal position when the actuating element couples with the brake pedal;
comparing the pedal position to a first threshold value and a difference between the pedal position and an actuator position to a second threshold value;
detecting the brake pedal actuation if either threshold value is exceeded; and
selecting between current offset values or previously recorded offset values for the sensor-offset calibration based on whether the brake pedal actuation is detected.

13. A vehicle braking system comprising:
a memory configured to store computer-executable instructions;
a processor configured to execute the computer-executable instructions to cause the processor to:
detect an unintended brake pedal actuation of a brake pedal by a driver during an initialization of an actuator of a brake system, in which, during operation of the actuator, a dynamic position analysis of a pedal position and/or of a pedal travel of the brake pedal and/or of an input piston takes place by:
controlling the actuator to displace an actuating element from a rear end position toward a front end position, the rear end position proximal relative to the brake pedal and the front end position distal proximal relative to the brake pedal;
establishing a start value of the pedal position when the actuating element couples with the brake pedal;
comparing the pedal position to a first threshold value and a difference between the pedal position and an actuator position to a second threshold value;
detecting the brake pedal actuation if either threshold value is exceeded; and
selecting between current offset values or previously recorded offset values for the sensor-offset calibration based on whether the brake pedal actuation is detected.

Assignees

• Zf Active Safety Gmbh

Inventors

• Dahm Andreas
• Friedrich Michael

Classifications

• G07C5/085

  using electronic data carriers · CPC title

• B60T7/042

  by electrical means, e.g. using travel or force sensors · CPC title

• B60T13/662

  characterised by specified functions of the control system components · CPC title

• B60T17/22 Primary

  Devices for monitoring or checking brake systems; Signal devices · CPC title

• B60T13/745 Primary

  acting on a hydraulic system, e.g. a master cylinder · CPC title