From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Article detailing the characteristics and operation of magnetically actuated spray valves for fuel injection systems.
| Identifier | ExFiles\Box 158\5\ scan0033 | |
| Date | 22th April 1939 | |
| 530 1360 Characteristics of Magnetically Fig. 1. Sectional view of the magnetically actuated spray valve showing laminations, plunger, needle, coils, etc. tem. Since in this method of injection the fuel column is an oscillating system, influenced by both the action of the pump and the nozzle, as well as by certain characteristics of the fuel which are not too well known, large variations in successive injections may be expected. The Atlas Imperial Diesel Engine Co., of Oakland, Calif., has developed a system of injection for small, high-speed engines which eliminates most of the problems encountered in the jerk-pump system. This system employs the common-rail principle with a magnetically actuated nozzle.¹ Although the engines in which these nozzles are used employ spark ignition and operate with low compression ratios, the system satisfies the requirements of Diesel engines. Experimental Equipment The experimental equipment employed in comparing the characteristics of the magnetically-actuated nozzle with the jerk-pump system consisted of a spray chamber at atmospheric pressure, on which was mounted a stroboscope. With the aid of the stroboscope the points of ¹ “Magnetically Actuated Spray Valves Meter Fuel.” P. M.{Mr Moon / Mr Moore} Heldt. AUTOMOTIVE INDUSTRIES, March 4, 1933. By C. J.{Mr Johnson W.M.} VOGT and T. A.{Mr Adams} ROGERS* THE function of any fuel injection system is to deliver a metered quantity of fuel to the engine cylinder and to distribute it in such a way that combustion may progress in the desired manner. This has been accomplished on many engines by the jerk-pump system, which, due to its simplicity, has become very popular in the field of high-speed Diesel engines. In the jerk-pump system the pressure transmitted to the fuel column by the pump supplies the energy which is required to actuate the needle in the nozzle. Hence, in such a system, satisfactory fuel metering, dispersion, and distribution in the engine cylinder depend upon the dynamics of the fuel pump, the dynamics of the fuel column between the pump and the nozzle, the dynamics of the nozzle, and the geometry of the system. * University of California. April 22, 1939 Fig. 2. Flux lines in the magnetically actuated spray valve A.{Mr Adams} Flux lines in the plane of a lamination. B. Flux lines through the frame and plunger laminations when needle is seated. C. Flux lines through the frame and plunger laminations when the needle is lifted from its seat. Automotive Industries | ||