# US 10,479,340 B2 · Overload protection for a parking lock

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- Number: US 10,479,340 B2
- Document ID: US10479340B2
- Status: Granted
- Kind: B2
- Application number: 15/378,877
- Filed: 2016-12-14
- Published: 2017-06-29
- Granted: 2019-11-19
- Earliest claimed: 2015-12-23
- Assignees: Audi AG
- Applicants: Audi AG
- Inventors: Uwe Feldmann
- Web page: https://patentgrep.com/patent/US10479340B2

## CPC

- B60T 17/221: {Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems (hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M)}
- B60T 7/107: {with electrical power assistance}
- B60T 13/74: with electrical assistance or drive
- B60T 17/22: Devices for monitoring or checking brake systems; Signal devices
- B60T 2270/413: Plausibility monitoring, cross check, redundancy
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES

## Abstract

A parking lock of a vehicle is normally controlled by a first control unit. In the presence of a predefined condition, control of the parking lock is assumed by a second control unit of the vehicle and the first control unit is disabled, at least in part, when the predefined condition is present.

## Claims

### Claim 1

A method, comprising:
normally controlling a parking lock of a vehicle by a first control unit;
measuring all measurement values from the group consisting of temperature of the first control unit, number of actuations of the parking lock in a predefined time period, current applied to the first control unit, voltage applied to the first control unit, current outputted by the first control unit and voltage outputted by the first control unit;
in the presence of a predefined condition, controlling the parking lock by a second control unit of the vehicle; and
disabling the first control unit, at least in part, in the presence of the predefined condition,
wherein the presence of the predefined condition is affirmed, when one of the measurement values corresponds to a respective one of predefined values.

### Claim 2 (depends on 1)

The method of claim 1, wherein further comprising controlling the parking lock is a parking brake of the vehicle controlled by the second control unit.

### Claim 3 (depends on 1)

The method of claim 1, further comprising replicating by the second control unit a functionality of the first control unit, when the parking lock is operated by the second control unit.

### Claim 4 (depends on 1)

The method of claim 1, wherein the second control unit is configured to operate a brake of the vehicle.

### Claim 5 (depends on 1)

The method of claim 1, further comprising continuously monitoring a functionality of the first control unit, when the predefined condition relates to the presence of a specific state of a functionality of the first control unit measuring all measuring values.

### Claim 6

A vehicle, comprising:
an electronic parking lock;
a first control unit configured to normally control the parking lock and to measure all measurement values from the group consisting of temperature of the first control unit, number of actuations of the parking lock in a predefined time period, current applied to the first control unit, voltage applied to the first control unit, current outputted and voltage outputted by the first control unit; and
a second control unit configured to control the parking lock in presence of a predefined condition, with the presence of the predefined condition being affirmed when one of the measurement values corresponds to a respective one of predefined values, and to disable the first control unit at least in part in the presence of the predefined condition.

### Claim 7 (depends on 6)

The vehicle of claim 6, wherein the second control unit is configured to replicate a functionality of the first control unit for controlling the parking lock.

### Claim 8 (depends on 6)

The vehicle of claim 6, further comprising a display unit operably connected to the second control unit so as to indicate, in response to the presence of the predefined condition, to a user that control of the parking lock has been assumed by the second control unit.