Method for operating a pump motor of a control device, control device, motor vehicle

Patent metadata

Field	Value
Publication number	US-2022017054-A1
Application number	US-202117308503-A
Country	US
Kind code	A1
Filing date	May 5, 2021
Priority date	Jul 16, 2020
Publication date	Jan 20, 2022
Grant date	—

Abstract

A method for operating a pump motor of a control device of a braking system. The control device has the pump motor, a valve device having at least one electrically operable switching valve, a first electric supply connection connectable electrically to the pump motor and a second electric supply connection connectable electrically to the valve device, an electric setpoint operating current being predetermined for the pump motor, and the pump motor being connected electrically to the first supply connection, so that the setpoint operating current is provided at least partially through the first supply connection. It is provided to connect the pump motor electrically to the second supply connection, so that the setpoint operating current is provided at least partially through the second supply connection.

First claim

What is claimed is:

1 . A method for operating a pump motor of a control device of a braking system, the control device including the pump motor, a valve device having at least one electrically operable switching valve, a first electric supply connection connectable electrically to the pump motor, and a second electric supply connection connectable electrically to the valve device, an electric setpoint operating current being predetermined for the pump motor, the method comprising:
electrically connecting the pump motor to the first supply connection, so that the setpoint operating current is provided at least partially through the first supply connection; and electrically connecting the pump motor to the second supply connection so that the setpoint operating current is provided at least partially through the second supply connection.

2 . The method as recited in claim 1 , wherein the pump motor is connected electrically to the second supply connection only when the setpoint operating current exceeds a predetermined current threshold value.

3 . The method as recited in claim 1 , wherein the first supply connection is disconnected electrically from the pump motor when the second supply connection is connected electrically to the pump motor.

4 . The method as recited in claim 1 , wherein the control device has a switching device that has a first semiconductor switch and a second semiconductor switch, the first and the second semiconductor switches being disposed in a first electric line by which the pump motor is connectable to the first supply connection, the first semiconductor switch being assigned a first diode blocking in a flow direction of the operating current, the second semiconductor switch being assigned a second diode conductive in the flow direction of the operating current, and only the first semiconductor switch being switched to the non-conductive state in order to disconnect the first supply connection from the pump motor.

5 . The method as recited in claim 4 , wherein the switching device has a third semiconductor switch and a fourth semiconductor switch, the third and the fourth semiconductor switches being disposed in a second electric line by which the pump motor is connectable electrically to the second supply connection, the third semiconductor switch being assigned a third diode blocking in the flow direction of the operating current, the fourth semiconductor switch being assigned a fourth diode conductive in the flow direction of the operating current, and only the third semiconductor switch being switched to a non-conductive state in order to disconnect the second supply connection from the pump motor.

6 . The method as recited in claim 1 , wherein a portion of the setpoint operating current is provided through the first supply connection, the portion differing from a portion of the setpoint operating current provided through the second supply connection.

7 . A control device for a braking system, the control device comprising:
a pump motor; a valve device having at least one electrically operable switching valve; a first electric supply connection connectable electrically to the pump motor; a second electric supply connection connectable electrically to the valve device; a switching device having a plurality of switches; and a control unit configured to, by driving the switching device:
electrically connect the pump motor to the first supply connection, so that a setpoint operating current is provided at least partially through the first supply connection, and
electrically connect the pump motor to the second supply connection so that the setpoint operating current is provided at least partially through the second supply connection.

8 . The control device as recited in claim 7 , wherein the switching device has a first electric line, by which the first supply connection and the pump motor are connectable electrically, the first line having a first semiconductor switch and a second semiconductor switch, the first semiconductor switch being assigned a first diode blocking in a flow direction of the operating current, and the second semiconductor switch being assigned a second diode conductive in the flow direction of the operating current.

9 . The control device as recited in claim 8 , wherein the switching device has a second electric line, by which the second supply connection and the pump motor are connectable electrically, the second line having a third semiconductor switch and a fourth semiconductor switch, the third semiconductor switch being assigned a third diode blocking in the flow direction of the operating current, and the fourth semiconductor switch being assigned a fourth diode conductive in the flow direction of the operating current.

10 . The control device as recited in claim 9 , wherein the second line is connected to the first line at a point between the first and the second semiconductor switches on one side and the pump motor on another other side.

11 . The control device as recited in claim 9 , wherein the switching device has a third electric line, by which the second supply connection and the valve device are connectable electrically, the third line having a fifth semiconductor switch.

12 . The control device as recited in claim 11 , wherein the second line is connected to the third line at a point between the fifth semiconductor switch on one side and the valve device on another other side.

13 . The control device as recited in claim 8 , further comprising:
a first capacitor that is connected electrically to the first line at a point between the first semiconductor switch and the second semiconductor switch on one side and the first supply connection on another other side.

14 . The control device as recited in claim 11 , further comprising:
a second capacitor that is connected electrically to the third line at a point between the fifth semiconductor switch on one side and the second supply connection on another the other side.

15 . A motor vehicle having a braking system which has a control device comprising:
a pump motor; a valve device having at least one electrically operable switching valve; a first electric supply connection connectable electrically to the pump motor; a second electric supply connection connectable electrically to the valve device; a switching device having a plurality of switches; and a control unit configured to, by driving the switching device:
electrically connect the pump motor to the first supply connection, so that a setpoint operating current is provided at least partially through the first supply connection, and
electrically connect the pump motor to the second supply connection so that the setpoint operating current is provided at least partially through the second supply connection;
wherein the first and the second supply connections are connected electrically to the same voltage source of the motor vehicle, or the first supply connection is connected electrically to a different voltage source of the motor vehicle than the second supply connection.

Assignees

• Bosch Gmbh Robert

Inventors

• Suelzle Helmut
• Backes Manfred

Classifications

• B60T13/68

  by electrically-controlled valves {(B60T13/662 and B60T13/665 take precedence)} · CPC title

• B60T17/02 Primary

  Arrangements of pumps or compressors, or control devices therefor · CPC title

• B60T13/662 Primary

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

• H01H9/548

  Electromechanical and static switch connected in series · CPC title