Patent ID: 6170466
Filing Date: 2001-01-09
Classification: F02M

Abstract:
A quantity control valve for delivering fuel from a low-pressure source to a high-pressure pump that is used to supply a high-pressure fuel of a fuel injection system for internal combustion engines, comprising a valve member (50), which is adjustable as a function of operating parameters, characterized in that as the valve member, a control slide (50) is used, which is displacement disposed in a slide bore (22) and has an annular groove (60) define by two piston regions (53, 54), the groove can be made to communicate with the low-pressure source via an inlet (31) and with the high-pressure pump via outlet (26), and the connection cross section to the outlet (33) is varied increasingly with the displacement of the control slide (50) by means of a control contour having three different continuous conical faces adjoining one piston region (53, 54) on a side toward the annular groove (60), the conical face control contour comprises a plurality of cones merging with one another, having different cone angles and/or cylindrical parts, in the slide bore (22), the control slide with one face end (51) defines a control chamber (23), in which a control pressure prevails that acts counter to a restoring force and is variable as a function of operating parameters, and in order to control the control pressure, the control chamber (23) communicates constantly via a throttle (66) with a first pressure region, and is made to communicate with a second pressure region, the second pressure region has a pressure level different from the pressure level of the first pressure region, via an outlet opening (35) controlled by an electrically controlled valve (70) as a function of operating parameters.