Driving dynamics system, electric vehicle with central control

Patent metadata

Field	Value
Publication number	US-12479404-B2
Application number	US-202117923909-A
Country	US
Kind code	B2
Filing date	Feb 8, 2021
Priority date	Feb 12, 2020
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A driving dynamics system for a vehicle may include a primary control unit for detecting and/or generating steering commands and braking commands; a brake system having first and second electrohydraulic pressure supply units; four hydraulically actuable wheel brakes of respective wheels; electrically actuable brake pressure adjustment valves; and an electric steering actuator for actuating at least one axle. The driving dynamics system may implement a steering command during normal operation to actuate at least one of the pressure supply units and the steering actuator and/or, to implement a braking command during normal operation, to actuate at least the second pressure supply unit and at least the brake pressure adjustment valves for a wheel-specific pressure adjustment and, in a fault case, to actuate at least the first pressure supply unit and at least the brake pressure adjustment valves for a wheel-specific pressure adjustment.

First claim

What is claimed is:

1 . A driving dynamics system for a vehicle, comprising:
a primary control unit for detecting and/or generating steering commands and braking commands, wherein the primary control unit is further designed to send setpoint values or braking commands to at least one brake module and to an electric steering actuator, wherein the electric steering actuator is arranged to actuate at least one axle; a brake system having a first electrohydraulic pressure supply unit and a second electrohydraulic pressure supply unit, wherein the first electrohydraulic pressure supply unit is part of a first brake module and the second electrohydraulic pressure supply unit is part of a second brake module, wherein the brake modules are arranged in separate housings spatially apart from one another and connected to one another via two hydraulic lines; four hydraulically actuable wheel brakes that are assigned to wheels; electrically actuable brake pressure adjustment valves; wherein the driving dynamics system is designed, in order to implement at least one steering command, to actuate at least one of the pressure supply units in such a way that, using at least one of the brake modules on at least one of the wheel brakes, a pressure is built up for generating a yaw moment when a switching state of one or more valves of the second brake module changes.

2 . The driving dynamics system as claimed in claim 1 , wherein a detection unit configured to detect at least the first fault case, corresponding to an at least partial failure of a brake module, associated with the second pressure supply unit, and/or of the steering actuator, wherein the driving dynamics system is designed, in the first fault case, to provide a yaw moment intervention and/or steering assistance, to build up a pressure in at least one wheel brake by way of the first pressure supply unit.

3 . The driving dynamics system as claimed in claim 1 , wherein a detection unit is designed to detect at least a second fault case, corresponding to at least partial failure of the steering actuator, wherein, in the second fault case, a steering command is implemented using the second pressure supply unit, by building up a pressure in the wheel brakes on one side of the vehicle.

4 . The driving dynamics system as claimed in claim 3 , wherein a first brake module having the first pressure supply unit is configured to apply a pressure medium to at least one first brake circuit via a first connection point and at least one second brake circuit via a second connection point, wherein
a first isolation valve of the first brake module is arranged in a first hydraulic line between the first pressure supply unit of the first brake module and the first connection point and a second isolation valve is arranged in a second hydraulic line between the first pressure supply unit and the second connection point, wherein the driving dynamics system is designed to detect a third fault case, corresponding to a total failure of a second brake module having the second pressure supply unit, and in the third fault case, to control the first pressure supply unit and the first and second isolation valves to implement at least one brake circuit-specific pressure control operation in the at least first and second brake circuits.

5 . The driving dynamics system as claimed in claim 1 , wherein the second pressure supply unit is connected to a first brake circuit via at least one first hydraulic line and the first pressure supply unit is connected to a second brake circuit via at least one second hydraulic line, wherein the first and the second hydraulic line are able to be hydraulically connected to and/or decoupled from one another via at least one isolation valve.

6 . The driving dynamics system as claimed in claim 5 , wherein the first and the second hydraulic line are able to be hydraulically connected to one another via at least one first and at least one second isolation valve, wherein a hydraulic line section between the first and the second isolation valve is connected to a reservoir via at least one outlet valve.

7 . The driving dynamics system as claimed in claim 1 , wherein each wheel brake is assigned one bidirectional brake pressure adjustment valve arranged to enable pressure build-up and pressure reduction in the respective wheel brake.

8 . The driving dynamics system as claimed in claim 1 , wherein the second pressure supply unit comprises a single-circuit pump that is connected hydraulically to a reservoir in order to convey pressure medium into a first brake circuit and/or a second brake circuit.

9 . The driving dynamics system as claimed in claim 6 , further comprising a detection device configured to detect a fourth fault case, the failure of a brake circuit, and/or a fifth fault case, the failure of a wheel brake, wherein the driving dynamics system is designed to close at least one of the isolation valves and/or at least one of the brake pressure adjustment valves in response to the detection of the fourth and/or the fifth fault case in order to hydraulically decouple the failed brake circuit and/or the failed wheel brake.

10 . The driving dynamics system as claimed in claim 1 , wherein the steering actuator comprises at least one electromotive drive with redundant windings and redundant control, such that, in an event of failure, functionality of the steering actuator is enabled to be maintained at least partially by way of the redundant windings and redundant control, and/or
the first and/or second pressure supply unit comprises at least one electromotive drive with redundant windings and redundant control, such that, in an event of failure, a pressure reduction and/or pressure build-up in the wheel brakes is able to be implemented at least partially by way of the redundant windings and redundant control.

11 . The driving dynamics system as claimed in claim 1 , wherein the driving dynamics system is designed to apply pressure to the wheel brakes for standstill braking by way of the first pressure supply unit and/or second pressure supply unit and/or to actuate at least one vehicle electric motor for standstill braking.

12 . The driving dynamics system as claimed in claim 11 , wherein in a sixth fault case, during an at least partial failure of the first pressure supply unit or the second pressure supply unit, the respective second or first pressure supply unit, which is not subject to the at least partial failure, is arranged to build up pressure and/or activate at least one of the vehicle electric motors in order to implement standstill braking.

13 . The driving dynamics system as claimed in claim 2 , wherein upon detection of an at least partial failure of the second pressure supply unit, the driving dynamics system is configured to provide an anti-lock braking (ABS) function and/or a yaw moment intervention, wherein wheel-specific and/or selective adjustment of pressures in the wheel brakes takes place by actuating at least one of the brake pressure adjustment valves and/or one of a plurality of isolation valves of the second brake module and the first pressure supply unit.

14 . The driving dynamics system as claimed in claim 1 , wherein the driving dynamics system is designed to actuate one of the first or second pressure supply units to cause a pressure reduction in at least one of the wheel brakes, wherein actuation takes place such that a piston of the one of the first or second pressure supply units is retracted.

15 . The driving dynamics system as claimed in claim 1 , further comprising:
at least one bus connection for communication connection

Assignees

• Ipgate Ag

Inventors

• Leiber Thomas

Classifications

• B62D5/0487

  detecting motor faults (B62D5/0496 takes precedence) · CPC title

• B60W50/02

  Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures · CPC title

• B60W10/20

  including control of steering systems · CPC title

• B60W10/188

  hydraulic brakes · CPC title

• B60T2270/30

  ESP control system · CPC title