US 12,103,506 B2
Method for operating a pump motor of a control device, control device, motor vehicle
Helmut Suelzle, Pleidelsheim (DE); and Manfred Backes, Oberheinriet (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on May 5, 2021, as Appl. No. 17/308,503.
Claims priority of application No. 102020203010.3 (DE), filed on Jul. 16, 2020.
Prior Publication US 2022/0017054 A1, Jan. 20, 2022
Int. Cl. B60T 8/17 (2006.01); B60T 13/66 (2006.01); H01H 9/54 (2006.01)
CPC B60T 13/662 (2013.01) [H01H 9/548 (2013.01)] 11 Claims
OG exemplary drawing
 
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 alternatingly to the first supply connection and the second supply connection, including performing the following steps a plurality of times in immediate succession:
a) electrically connecting the pump motor to the first supply connection for a predetermined first period of time, so that the setpoint operating current is provided at least partially through the first supply connection, wherein, during the predetermined first period of time, the pump motor is electrically disconnected from the second supply connection while the pump motor is electrically connected to the first supply connection; and
b) immediately after expiration of the predetermined first period of time, electrically disconnecting the pump motor from the first supply connection and electrically connecting the pump motor to the second supply connection for a predetermined second period of time so that the setpoint operating current is provided at least partially through the second supply connection, wherein the pump motor is electrically disconnected from the first supply connecting during the predetermined second period of time, and wherein immediately after expiration of the predetermined second period of time, the pump motor is electrically disconnected from the second supply connection;
wherein the control device has a switching device that 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;
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; and
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.