| 摘要 |
1528069 Controlling supercharged IC engine power-plant FRANCE ARMED FORCESMINISTER OF 21 April 1976 [24 April 1975] 16210/76 Heading F1B In a power-plant comprising a diesel engine 10 with a turbocharger 11, 12 and an engine by-pass conduit 22, a throttle 25 is provided downstream of the junction of the by-pass 22 and engine intake pipe. Control means operate the throttle 25 to automatically limit the air-flow rate to engine 10 when the plant is delivering a fraction of its maximum rated power. The plant is started by turning the turbocharger 11, 12 (by motor 15) and supplying fuel to an auxiliary combustion chamber 19 whilst biasing springs 41, 44 maintain the throttle 25 closed and hot gases pass along duct 26 and into engine inlet manifold 18 and out through valve 54 see Fig. 4, to warm the inlet manifold 18. The engine 10 is cranked so that an oil pump 28 pressurizes line 30 to close valve 54 and seal the manifold. The oil pump 28 supplies oil at a pressure proportional to the square of engine speed, to move piston 43 gradually leftwards opening the throttle 25 yet ensuring that sufficient air-flow is maintained in duct 22 to supply the auxiliary combustion chamber 19. The ratio of throttle opening rate/engine speed is modified in accordance with ambient temperature by bleeding oil through a constant throttle 33 and a variable throttle 35, to counter-pressure chamber 42, the variable throttle 35 being regulated by a capsule 37. When supercharger pressure reaches a level determined by a spring 47 acting against piston 46, a slide valve 45 is closed shutting the bleed 33 to move piston 43 to its extreme left position thus over-riding the engine speed dependant control of the throttle 25. This pressure level can be varied with temperature by providing an ambient temperature dependant throttle assembly 49, 50 in the line (chain-dotted) connecting piston 46 to the intake pipe 18. |
