Patent GB-871123-A (GB)
Title: Improvements in or relating to means for controlling an accelerated idling speed
IPC: F02D9/00
Filed: 1959-01-06
Abstract: 871,123. Fluid-pressure servomotor control systems. FRANCAISE DU FERODO S.A. Jan. 6, 1959 [Jan. 7, 1958; April 4, 1958; June 6, 1958], No. 552/59. Class 135. [Also in Group XXVII] A means for controlling an accelerated idling speed of an internal combustion engine by way of a governor, more particularly for motor vehicles in which an acceleration of the idling speed is brought about when the speed of a shaft exceeds a predetermined value is characterized in that a relay releases a fluid energy hydraulic or pneumatic for acceleration of the idling speed and is directly controlled by a force which is dependent on the speed of the governor shaft. The invention is more particularly for motor vehicles with an automatic clutch which is disengageable at the idling speed of the engine. In Fig. 1 the throttle 12 of the carburetter is controlled from an accelerator pedal (not shown). An abutment 13 defines the minimum opening of the throttle 11 when the accelerator has been fully released. The abutment limits the closing of the throttle when the speed of the vehicle is above a predetermined value. The speed of the shaft 31 is proportional to that of the vehicle or to that of an intermediate shaft or input shaft of the gear-box. When the speed of the shaft is sufficiently low the valve 20 bears against the seating 21 and the abutment 13 is withdrawn under the effect of the reduced pressure in the manifold 10. When the speed of the shaft 31 increases sufficiently the valve 20 is moved against the seating 22. Atmospheric pressure penetrates at 23 into the chamber 18 and conduit 16 and the abutment 13 is advanced. In Fig. 3 the shaft 31 is actuated by the shaft 35 of the speedometer of the vehicle. When the speed of the shaft 31 is above the predetermined value the chamber 15 is under atmospheric pressure and the needle 44 uncovers the passage 45. An accelerated idling speed is obtained. The chamber 46 is fed with air by a conduit 47 and with fuel by means of an orifice 48. Figs. 4 and 5 show another embodiment. When the vehicle is travelling at a speed greater than a predetermined value the valve 94 is open and the chamber 67 communicates with the atmosphere. The spring 81 opens the valve 73. Combustible mixture for idling purposes passing through the needle 55 and jet 56 also finds in addition to the orifice 57 (and finally 59) an additional outlet towards the conduit 52-62 by way of the passage 70, 73, 78, 71. Thus the total combustible mixture supplied to the engine cylinders through conduit 52 is increased by a proportion of fuel which is mixed in the chamber 67 with the calibrated amount of additional air entering through the pipe 72 to form an additional combustion mixture in the chamber 67 which passes to the conduit 62 through the passage 71. Preferably the spring 81 is calibrated by adjustment of the nuts 100 and 101 so that the valve 73 is opened in respect of a reduced pressure in the intake manifold at 62, corresponding to a reduced speed of the engine, for example of less than 2000 r.p.m., when the vehicle actuates the engine, the valve 73 being closed despite the intake of air by the pipe 72. When the part 60 is constructed of a thermally insulating material such as a suitable plastic substance the gasket 102 may be dispensed with. The governor 82 is responsive to the speed of one of the shafts of the gear-box. It is with advantage coupled with the shaft of the speedometer of the vehicle.