Method for electronically controlling a brake unit in an automatically controllable utility vehicle combination, and electronically controllable brake unit in an automatically controllable utility vehicle combination

Patent metadata

Field	Value
Publication number	US-11097702-B2
Application number	US-201716329228-A
Country	US
Kind code	B2
Filing date	Jul 17, 2017
Priority date	Aug 31, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A method for electronically controlling a brake unit having two brake systems in an automatically controllable vehicle combination includes inputting a request signal for automatic electronic activation of service brakes in a tractor vehicle brake system of a tractor vehicle and/or a trailer brake system of a trailer of the vehicle combination, wherein an automatically requested vehicle setpoint acceleration and/or an automatically requested vehicle setpoint velocity to be implemented by the respective service brakes are transmitted via the request signal. The method further includes monitoring and checking plausibility of the request signal to establish whether the automatically requested vehicle setpoint acceleration and/or the automatically requested vehicle setpoint velocity are or can be implemented completely or faultlessly by the respective service brakes. The method additionally includes outputting a trailer redundancy control signal at the trailer brake system under certain conditions.

First claim

The invention claimed is:

1. A method for electronically controlling a brake unit having two brake systems in an automatically controllable vehicle combination, the method comprising:
inputting a request signal for automatic electronic activation of service brakes in a tractor vehicle brake system of a tractor vehicle and/or a trailer brake system of a trailer of the vehicle combination, wherein an automatically requested vehicle setpoint acceleration and/or an automatically requested vehicle setpoint velocity to be implemented by the respective service brakes are transmitted via the request signal;
monitoring and checking plausibility of the request signal to establish whether the automatically requested vehicle setpoint acceleration and/or the automatically requested vehicle setpoint velocity are or can be implemented completely or faultlessly by the respective service brakes;
outputting a trailer redundancy control signal at the trailer brake system in response to an implementation of the automatically requested vehicle setpoint acceleration and/or of the automatically requested vehicle setpoint velocity not being or not being able to be performed completely or faultlessly; and
carrying out an electrically redundant activation of the trailer brake system using the trailer redundancy control signal to transfer the vehicle combination into a safe state,
wherein deceleration of the vehicle combination is performed exclusively via the trailer brake system in response to the trailer redundancy control signal.

2. The method as claimed in claim 1 , wherein, for the plausibility check of the request signal, it is checked whether a defect is present in a central control unit controlling the brake systems and/or in an assistance control unit outputting the request signal, wherein a defect is reported via a diagnosis signal, wherein the diagnosis signal is produced in a self-diagnosis in the respective control unit.

3. The method as claimed in claim 1 , wherein, to check the plausibility of the request signal, it is determined whether a connection fault is present.

4. The method as claimed in claim 1 , wherein, to check the plausibility of the request signal, it is determined whether an actually present vehicle actual acceleration and/or a vehicle actual velocity is within a tolerance range around the vehicle setpoint acceleration or the vehicle setpoint velocity, respectively.

5. The method as claimed in claim 1 , wherein, to check the plausibility of the request signal, it is determined whether the request signal and/or control signals for electrically controlling the axle modulators of the respective brake system, which are output by a central control unit, are monotonous.

6. The method as claimed in claim 1 , wherein, in the event of an incomplete or faultless implementation of the automatically requested vehicle setpoint acceleration and/or the automatically requested vehicle setpoint velocity, the tractor vehicle brake system is not activated.

7. The method as claimed in claim 1 , wherein, in the event of an incomplete or faultless implementation of the automatically requested vehicle setpoint acceleration and/or the automatically requested vehicle setpoint velocity and for the case in which an assistance control unit automatically controlling the vehicle combination via a request signal does not have a defect, the trailer redundancy control signal is generated in dependence on the request signal.

8. The method as claimed in claim 1 , wherein, in the event of an incomplete or faultless implementation of the automatically requested vehicle setpoint acceleration and/or the automatically requested vehicle setpoint velocity, the trailer redundancy control signal is generated such that the vehicle combination is transferred into a standstill.

9. The method as claimed in claim 1 , wherein, in the event of an incomplete or faultless implementation of the automatically requested vehicle setpoint acceleration and/or the automatically requested vehicle setpoint velocity, a brake slip regulation is carried out in the trailer brake system upon occurrence of a case of brake slip.

10. The method as claimed in claim 1 , wherein, in the event of an incomplete or faultless implementation of the automatically requested vehicle setpoint acceleration and/or the automatically requested vehicle setpoint velocity, only an electrically redundant activation of the trailer brake system by the trailer redundancy control signal is enabled.

11. The method as claimed in claim 1 , wherein, in the event of an incomplete or faultless implementation of the automatically requested vehicle setpoint acceleration and/or the automatically requested vehicle setpoint velocity, a redundant pneumatic activation of the trailer brake system via a trailer control pressure is enabled in dependence on a manual actuation, if the pneumatically redundant brake request via the trailer control pressure is greater than the electrically redundant brake request via the trailer redundancy control signal.

12. The method as claimed in claim 1 , wherein, in the event of an incomplete or faultless realization of the automatically requested vehicle setpoint acceleration and/or the automatically requested vehicle setpoint velocity, and in the event of a failure of a first energy source, an energy supply of the trailer brake system is performed via a second energy source.

13. The method as claimed in claim 12 , wherein in the event of an electrically redundant activation of the trailer brake system, because of which an activation of brake lights in the trailer is performed via a brake light signal, the trailer brake system is supplied with energy via the brake light signal at the same time.

14. The method as claimed in claim 1 , wherein the assistance control unit only outputs a request signal when a trailer having a trailer brake system has been detected.

15. An electrically controllable brake unit in an automatically controllable vehicle combination comprising at least a tractor vehicle and a trailer, the electrically controllable brake unit comprising:
a tractor vehicle brake system having at least one tractor vehicle brake circuit and a trailer brake system having at least one trailer brake circuit for decelerating the vehicle combination via tractor vehicle service brakes and trailer service brakes,
a foot brake valve configured to manually specifying an electrical actuation signal in dependence on a manual actuation,
an assistance control unit configured to automatically specifying a request signal,
a central control unit configured to output electrical control signals at at least one tractor vehicle axle modulator in the tractor vehicle brake system and at least one trailer axle modulator in the trailer brake system in dependence on the request signal or the actuation signal,
a trailer plug connection configured to transmit signals from the tractor vehicle to the trailer,
wherein furthermore a monitoring unit is provided, which is arranged in a data line leading to the trailer brake system and is designed to monitor and check the plausibility of the complete or faultless implementation of the automatically requested request signal and to output a trailer redundancy signal at the trailer brake system if the implementation is not performed or cannot be performed completely or faultlessly, to decelerate the vehicle combination via the trailer and transfer the vehicle combination into a safe state, and
wherein the monitoring unit is arranged in a data line between the central control unit and a trailer axle modulator associated with the trailer brake system.

16. T

Assignees

• Wabco Europe Bvba
• Zf Cv Systems Europe Bv

Inventors

• Wulf Oliver

Classifications

• B60T17/221

  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) · CPC title

• B60T2270/10

  ABS control systems · CPC title

• B60T8/17616

  Microprocessor-based systems · CPC title

• B60T7/20

  specially for trailers, e.g. in case of uncoupling of {or overrunning by} trailer (inertia-actuated overrun brakes B60T13/08) · CPC title

• B60T2270/414

  Power supply failure · CPC title