Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1990-04-11
1991-07-30
Miller, Carl Stuart
Internal-combustion engines
Charge forming device
Fuel injection system
417273, 92 72, 123497, F02M 3704
Patent
active
050352210
ABSTRACT:
A fuel injection system having a novel electromagnetic-actuated fuel pump in which four pumping elements, equally-spaced around a camshaft are mounted such that a pair of opposed pumping elements alternate to deliver pressure to a high pressure common rail with a second pair of pumping elements. In one embodiment of the invention the pumping elements are mechanically actuated, in another they are electronically actuated. The high pressure common rail is adapted to reduce surges in the fuel pressure from the pump up to levels of 20,000 psi. The common rail has a relief valve for controlling the maximum pressure in the common rail chamber. The electromagnetic injection nozzle has a needle valve that is closed by pressure in a balancing chamber having a reduced pressure level less than that of the pressure required to open the valve. When the supply fuel flow is blocked, the valve is closed by a spring, assisted by the pressure in the balancing chamber which overbalances the needle valve when the nozzle pressure has dropped by the termination of the supply fuel flow.
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SAE Technical Paper Series 840273, "Direct Digital Control of Electronic Unit Injectors" by N. John Beck et al. (1984), Feb-Mar.
SAE Technical Paper Series 810258, "Electronic Fuel Injection Equipment for Controlled Combustion in Diesel Engines" by R. K. Cross et al. (1981), Feb.
SAE Technical Paper Series 880421, "EMI-Series-Electromagnetic Fuel Injection Pumps" by Michael M. Schechter and Aladar O. Simko (1988), Feb-Mar.
SAE Technical Paper Series 861098, "EEC IV Full Authority Diesel Fuel Injection Control" by William Weseloh (1986), Aug.
SAE Technical Paper Series 850453, "An Electronic Fuel Injection System for Diesel Engines" by P. E. Glikin (1985), Feb-Mar.
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