Patent GB-868749-A (GB)
Title: A control mechanism for reversible internal combustion engines
Inventor: GNEISE ARMIN
IPC: F01L13/00
Filed: 1960-03-14
Abstract: 868,749. Control mechanisms for diesel engines. SCHWERMASCHINENBAU K. LIEBKNECHT MAGDEBURG VEB. March 14, 1960, No. 8993/60. Class 7(5). A control mechanism for reversible internal combustion engines, particularly for marine engines having a compressed-air starting system and a reversing mechanism 21 operating with pressure medium, comprises an operating shaft 3, actuated by an operating member 1 mounted thereon or by a control lever of a remote control station 36 and initiating the various operating processes of the engine, a control bar 13 actuated initially by a pressure medium in dependance upon the movements of the operating shaft 3, control elements mounted on the control bar 13 for pressurizing a reversing mechanism 21 and for actuation of an engine starting valve 17, locking means 16 associated with the control bar and operatively connected to the reversing mechanism 21, means 29 for regulating the speed of the engine operatively connected to the operating shaft and means 35 for operating shaft 3 from the remote control station 36 when desired. To reverse the engine the operating bar 1 is moved to the required position when cam 4 or 4a mounted on shaft 3 opens valve 5 or 5a according to the selected direction of rotation. Air flowing in from a storage tank (not shown) via a pressure reducing valve 27 holds open the valves 5 or 5a even after the cams have been rotated past the latter and simultaneously sets a piston 10 in motion which displaces the control bar 13 so that cam 22 or 22a opens valve 15 or 15a according to which control valve 5 or 5a was opened. Compressedair is released'via the centrifugally controlled valve 20 to the reversing mechanism 21, whilst the control bar 13 is prevented by a lock 16 from further movement until the reversal is completed. When this is achieved the bar 13 moves further and actuates through cam 18 or 18a the starting valve 17 controlling the accelerator valve 38 which allows air to start the engine 41; also the fuel feed is cut off for the duration of the starting process by linkage 19 through cam 23 or 23a. Simultaneous with the starting process a piston 24 opens a relief valve 25 due to the action of the starting compressed-air so that air is able to escape from chamber 7 or 7a via a changeover valve 8 into the atmosphere at the valve 25. The relieving of chambers 7 or 7a also exhausts air out of the cylinder part 12 or 12a of the piston 10, which permits the latter to return by spring power to its central position when the starting valve 17 and linkage 19 return to their initial positions. The starting period is adjusted by a throttle means 26 associated with exhaust valve 25. After the closure of the accelerator valve 38 by the starting valve 17 the piston 24 of the valve 25 likewise closes whereby valves 5, 5a are brought into readiness for fresh manoeuvres. The cam 28 connected operatively to the shaft 3, and with it the speed control valve 30 of an hydraulically operating device 29, adopt a specific position corresponding to the working point selected. Upon the lubricating oil pressure employed being introduced the follow up piston 31 adjusts the speed regulator 33 accordingly. If the engine is switched off a cam 9 moves the linkage 19 so that the fuel is cut off. When the engine is reversed the lever 1 is rotated from one working point over the "Stop" mark into the other, the processes occurring as described, but the slide valve 20 is at this moment closed, so that the engine cam shaft 32 cannot be moved until due to the blockage of fuel feed which takes place by means of cam 23 or 23a acting on linkage 19, the engine speed falls low enough so that the slide valve 20 opens, at which speed reversal is correctly possible. Before valve 20 opens air is released from valve 15 or 15a through pipe 11 or 11a, via a changeover valve 42 and control valve 39, to the inlet valve 40 of the engine 41, which valve opens allowing the compression stroke pressure air to escape into the atmosphere through the accelerator valve 38 thus braking the engine. The link between the remote control station 36 and the operating shaft may be electrical, hydraulic or mechanical.