GB603157A - Control devices and systems for the throttle valves of internal combustion engines - Google Patents

Abstract

603,157. Fluid-pressure servomotor-control systems. BENDIX AVIATION CORPORATION. Feb. 7, 1945, No. 3145. Convention date, Nov. 2, 1943. [Class 135] The throttle of an internal combustion engine is controlled by a fluid-pressure servomotor boost control in which the control valve is responsive to the setting of the manual control device and to a member responsive to induction pressure, and atmospheric pressure and temperature, and the movement of this member is limited in its opening effect on the throttle by an adjustable abutment, and a second abutment which limits the movement of the control valve is dependent in its position on the opening of the throttle valve. In an aeroplane engine, actuation of the pilot's control lever 1 towards the position shown in dotted lines causes a direct opening movement of the throttle valve 19 through a link 3, lever 5, shaft 6, ]ever 11, floating lever 12, link 13, bell crank 14, shaft 16, lever 17, floating lever 101, and link 18. At the same time, the datum of the control valve 40 of the fluid pressure boost control is reset through a lever 8 carried by the shaft 6, link 20, a lever 24 adjustably connected to link 20, shaft 25, cam 27, lever 30, floating lever 36, and link 39. A stop 9 is provided for lever 8. The induction pipe pressure is applied through a pipe 60 to the inside of a bellows 57 provided with a moving end wall 61 which is common to a second, partially-evacuated, spring-loaded bellows 58. Movement of the end wall 61 is communicated through a link 37 and floating lever 36 to the valve 40 which controls the flow and exhaust of pressure fluid to the two ends of a spring-loaded servo-piston 52. The piston is connected to the throttle through a link 63 and the floating lever 12. An adjustable stop 64 sets a limit to the collapsing of bellows 57 and so cuts out the automatic control of the throttle below a predetermined induction pipe pressure. A second stop 66 is provided in bellows 58 to engage the opposite side of wall 61. As the throttle opens, an arm 67 on bell crank 14 engages and pushes over a lever 68 carried on an adjustable eccentric pin 69, and lever 68 advances a stop 76 which prevents valve 40 from assuming the position in which pressure fluid is supplied to the servo-piston to open the throttle further. An over-riding manual control of the throttle is provided by a lever 100 which is connected to floating lever 101 through a link 105, and by adjustment of lever 100 the operation of the automatic control can be varied. Specifications 449,258, 572,647 and 573,691 are referred to.