Patent GB-1460632-A (GB)
Title: Load follow-up system for internal combustion engine equipped with supercharger
IPC: F02D41/08
Filed: 1974-03-21
Abstract: 1460632 IC engines - regulating YANMAR DIESEL ENGINE CO Ltd 21 March 1974 12623/74 Heading F1B The invention relates to a load follow-up control for an I.C. engine of the Diesel type having a supercharger, there being detector means connected to the engine for sensing a sudden application of load to the engine. In Fig. 1 the engine E drives a generator G which may be connected to electric loads M1, M2, M3; the generator is provided with a device 2 which senses any reduction in speed consequent upon application of load, the device 2 supplying a signal to a control circuit 1 which in turn controls an air feed device A, an intake air relief device B and a fuel rack shifting device C. The device A supplies air under pressure from a container into the engine cylinders through an inlet other than the intake manifold, the device B opens a valve whereby air under pressure from the supercharger is discharged to atmosphere, and the device C moves the fuel rack in the fuel increasing direction. The device 2 comprises a shaft 20 secured to the shaft of the generator G, a ring member 23 having a pair of projections 21, 22, being secured to the shaft; a disc (26) is rotatably mounted on the shaft 20 by means of a bearing and supports a member 26B formed with a rectangular opening 28, 29, the ring member 23 and projections 21, 22 being located within the rectangular opening. A spring 32 extends between the projection 21 and the face 28 of the opening, and a pair of electrical contacts 36, 37 are associated with the projection 22. Upon sudden application of load the shaft 20 would immediately slow but the member 26A, 26B would continue to rotate at its original speed due to its inertia, the contacts 36, 37 close whereby the control circuit is operated and the devices A, B, C are brought into operation. The engine E in Fig. 5 is shown with its air starting circuit X, its air feed device A, and its intake air relief device B - the engine comprises supercharger 50, air intake manifold 51 and exhaust manifold 52, air starting valve 53, air storage bottle 54, and starting lever 61. At starting, air from the bottle 54 passes to the starting air choke 55, the starting air control valve 56 and pipe 57, the distribution valve 58 and so to the starting valve 53. In normal running, upon application of increased load, the solenoid valve a is energized and opens allowing air from the storage bottle to pass through the follow-up air choke valve 60 to the main starting air pipe 57 and so to the engine cylinders. As the valve a was energized so also was the valve b, whereby the engine intake manifold 51 was vented to atmosphere - this prevents the onset of surging of the supercharger. The engine governor 72, Fig. 6 is connected to the rack 71 of the fuel pump 70 by a linkage including a lost-motion device 73. Thus as the solenoid c is actuated upon increase in load so the rack is moved in the fuel-increasing direction (+), the lost-motion device 73 permitting such movement. Other embodiments are described in which the increase in load is detected by electrical means.