公开(公告)号：EP0876273A1

公开(公告)日：1998-11-11

申请号：EP97902175.0

申请日：1997-01-16

申请人： ITT Automotive Europe GmbH

发明人： KOHL, Andreas

IPC分类号： B60T8 ,  B60T13 ,  B60T17 ,  F04B49

CPC分类号： F04B49/02 ,  B60T8/404 ,  B60T8/4275 ,  F04B2203/0202 ,  Y10S303/03 ,  Y10S303/11

摘要： A brake pressure control system is proposed which works on the fluid-return principle. This system contains a low pressure accumulator (9) which must be emptied at the end of a braking action with brake pressure control. For this purpose the pump (12) is controlled for a certain time. In this emptying phase, the motor (13) is controlled by pulse-width modulation. During the phases of the control signal during which no voltage is applied to the motor (13), a measurement of the electromotive counterforce is performed. This counterforce is a measure of the speed of the motor (13) or the speed of the connected pump (12). If the speed or the change is speed exceeds a given value, then this can be accepted as an indication that the low pressure accumulator is empty. As soon as such a signal appears, the emptying phase is ended by switching off the motor (13). In this way the emptying phase is kept as short as possible.