GB866713A - Fuel injector mechanism for internal combustion engines - Google Patents

Abstract

866,713. Regulating. BORG-WARNER CORPORATION. Aug. 30, 1957 [Sept. 7, 1956]. No. 27435/57. Class 7(6). [Also in Group XXVIII] A fuel injection pump control member is controlled by suction in a conduit 162 set up by an orifice 152 in the edge of the throttle valve and an orifice 153 in its downstream face, which suction increases with increasing air flow and throttle opening and decreases the fuel supply. The pump control member 68 is controlled by a cam 100 which is moved axially by a diaphragm 128 responsive to engine load and transversely by a diaphragm 123 responsive to engine speed as measured by the suction produced in the chamber 148 in the throttle valve. For small throttle openings the pressure in chamber 148, which is conducted through a passage 149 in the throttle spindle 146 to a chamber 163 con nected by a pipe 162 to diaphragm 123, is intermediate the pressures upstream and downstream of the throttle valve and varies with engine speed and throttle opening. The cam 100 has pins 102, 101 sliding in grooves 106, 109, in guide plates 103, 107 which are pivoted at 105, 108. As the suction in chamber 148 diminishes with increasing throttle opening, diaphragm 123 swings plate 103 to the right to move cam 100 and control member 68 to the right to increase the fuel supply. The lower guide plate 107 is controlled by a capsule 177 responsive to ambient pressure and temperature. On increase of load the pressure at point 157 increases, causing diaphragm 128 to move the cam 100 upwards whereby its inclined face 115 moves member 68 in the increased fuel direction. On rapid acceleration a loose piston and cylinder connection 133, 132, between the rod 129 of diaphragm 128 and the guide plate 103 causes temporary rapid movement of plate 103 to the right to increase the fuel supply, an extension bracket 110 contacting the lower guide plate 107 to force it to the right to further increase the supply. The plates 103, 107 resume their normal positions after acceleration under the force of a spring-loaded lever 116 which holds member 68 against the cam face 115, the air leaking slowly past the loose piston 133. The suction in chamber 163 is modified during cold running to increase the fuel supply by opening of a valve 170, controlled by a capsule 171 responsive to engine temperature, to connect a passage 167 leading to pressure tapping points 158, 159 to the chamber 163. Enrichment at idling is also obtained by opening of a valve 172 by a cam 173 on the throttle shaft to connect passages 160, 161, to the chamber 163 and modify the suction therein. The fuel injection pump and its control means connected to member 68 is identical with that in Specification 866,712.