公开(公告)号：US20200298811A1

公开(公告)日：2020-09-24

申请号：US16816329

申请日：2020-03-12

Applicant: FCA Italy S.p.A.

Inventor： Gianluca MARCOLONGO ,  Renato BADINO ,  Michele IELUZZI ,  Giovanni GABIATI ,  Stefano LUCÀ ,  Paolo GRAZIANO

IPC: B60T13/57 ,  B60T17/02 ,  B60T17/22 ,  B60T13/24 ,  B60T13/72

Abstract: A vehicle braking system includes an assistance device, having a vacuum pump driven by an engine for communicating vacuum to a chamber of the assistance device. A control valve is interposed along a fluid line between the pump and the chamber. The control valve is in its first operative condition, where the inlet side of the vacuum pump communicates with the chamber, when the pressure within the chamber is above a predetermined value; and is in its second operative condition, where the inlet side of the vacuum pump communicates with the atmosphere, when pressure within the chamber is below a predetermined value. In this second condition the pump intakes air from and feeds air into the atmosphere, thereby reducing the energy consumption by the engine required for driving the pump during stages where, within the chamber there is a vacuum sufficient for the regular operation of the braking system.