Method for monitoring an electric motor, electronic control module, hydraulic brake system and storage medium

Patent metadata

Field	Value
Publication number	US-11565671-B2
Application number	US-201916508479-A
Country	US
Kind code	B2
Filing date	Jul 11, 2019
Priority date	Jul 25, 2018
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A method for monitoring an electric motor of a hydraulic brake system for a motor vehicle, wherein a first torque and a second torque are calculated and compared with one another. A fault can be detected on the basis of the comparison. The invention also relates to an associated electronic control module, to an associated hydraulic brake system and to an associated non-volatile computer-readable storage medium.

First claim

The invention claimed is:

1. A method for monitoring an electric motor of a hydraulic brake system for a motor vehicle, wherein the method comprises:
determining a motor angular acceleration during operation of the electric motor;
calculating a first torque of the motor during operation of the electric motor on the basis of one or more first values, the one or more first values including the motor angular acceleration,
measuring a hydraulic pressure of the hydraulic brake system with a pressure sensor;
calculating a second torque of the motor during the operation of the electric motor on the basis of one or more second values different from the one or more first values, the one or more second values including the measured hydraulic pressure, and
detecting a malfunction on the basis of a comparison of the first torque and of the second torque.

2. The method as claimed in claim 1 ,
wherein the first torque is a motor load torque.

3. The method as claimed in claim 1 ,
wherein the first torque is calculated on the basis of an electrical motor torque, a moment of inertia and the motor angular acceleration.

4. The method as claimed in claim 3
wherein the first torque is calculated as follows:
the electrical motor torque minus the moment of inertia multiplied by the motor angular acceleration.

5. The method as claimed in claim 3 ,
wherein the motor angular acceleration is extracted by an observer.

6. The method as claimed in claim 1 ,
wherein the second torque is calculated on the basis of at least each of the measured hydraulic pressure, a transmission ratio, an area of a linear actuator piston which is driven by the motor, and an efficiency constant.

7. The method as claimed in claim 6 ,
wherein the second torque is calculated as follows:
the product of the efficiency constant, the area of a linear actuator piston which is driven by the motor, the transmission ratio and the measured hydraulic pressure, divided by 2 and by n.

8. The method as claimed in claim 1 ,
wherein the comparison comprises the following:
calculating a difference between the first torque and the second torque,
comparing the difference with a predetermined threshold value, and
detecting a malfunction if the difference exceeds the predetermined threshold value.

9. The method as claimed in claim 1 , wherein the method is executed if the motor is actuated by an electronic control module, without taking into account a user activation of a brake pedal or an activation request by a function which is executed in the electronic control module.

10. An electronic control module comprising a non-volatile computer-readable storage medium which contains instructions which, when executed by the electronic control module, cause the electronic control module to execute a method for monitoring an electric motor of a hydraulic brake system for a motor vehicle, including:
determining a motor angular acceleration during operation of the electric motor;
calculating a first torque of the motor during operation of the electric motor on the basis of one or more first values, the one or more first values including the motor angular acceleration,
measuring a hydraulic pressure of the hydraulic brake system with a pressure sensor;
calculating a second torque of the motor during the operation of the electric motor on the basis of one or more second values different from the one or more first values, the one or more second values including the measured hydraulic pressure, and
detecting a malfunction on the basis of a comparison of the first torque and of the second torque.

11. A hydraulic brake system for a vehicle, wherein the brake system comprises:
a linear actuator piston for generating hydraulic pressure,
an electric motor which is designed to drive the linear actuator piston,
a pressure sensor for measuring the hydraulic pressure, and
an electric control module as claimed in claim 10 .

12. A non-volatile computer-readable storage medium which contains instructions which, when executed by an electronic control module, cause the electronic control module to execute a method for monitoring an electric motor of a hydraulic brake system for a motor vehicle, including:
determining a motor angular acceleration during operation of the electric motor;
calculating a first torque of the motor during operation of the electric motor on the basis of one or more first values, the one or more first values including the motor angular acceleration,
measuring a hydraulic pressure of the hydraulic brake system with a pressure sensor;
calculating a second torque of the motor during the operation of the electric motor on the basis of one or more second values different from the one or more first values, the one or more second values including the measured hydraulic pressure, and
detecting a malfunction on the basis of a comparison of the first torque and of the second torque.

13. The method as claimed in claim 2 , wherein the first torque is calculated on the basis of an electrical motor torque, a moment of inertia and a motor angular acceleration.

14. The method as claimed in claim 4 , wherein the motor angular acceleration is extracted by an observer.

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Cimpoesu Albert
• Budianu Bogdan
• Münz Eberhard
• Kaufmann Tom

Classifications

• B60T8/172 Primary

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

• B60T8/4022

  Pump units driven by an individual electric motor (B60T8/4027 takes precedence) · CPC title

• B60T8/885

  using electrical circuitry · CPC title

• B60T8/171

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

• B60T8/4036

  Pump units characterised by their failure-responsive means (B60T8/88 takes precedence) · CPC title