Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-02-16
1990-09-18
Miller, Earl Stuart
Internal-combustion engines
Charge forming device
Fuel injection system
123 4131, 123446, 2395339, F02M 3900
Patent
active
049570854
ABSTRACT:
An improved fuel injector (10) having a needle valve (31) is mounted within a separate removable guide (26) for sliding movement between seated and unseated positions on a valve seat (18). Fuel injector (10) is adapted for operation in a primary fluid control mode (FIG. 5) under the influence of pressurized control fluid in a fluid chamber (30) adjacent the outer end of the needle valve (31), and for alternate operation in a secondary mechanical control mode (FIG. 6) under a mechanical mode spring (96) in the event of a decrease in operating fluid control pressure of the pressurized control fluid below a predetermined minimal amount. Continuous operation of the fuel injector (10) in the alternate operation under the mechanical spring (96) mode is automatic upon the reaching of a predetermined minimum pressure in the operating control fluid. A shutdown system is illustrated in FIG. 7 which overrides both the primary fluid control mode of operation and the secondary mechanical spring mode of operation to hold the needle valve (31) in seated position on its seat ( 18) under a fluid control pressure when certain engine conditions outside safe operating ranges are sensed. A microprocessor (98) receives input signals from sensors (98A-98H) for sensing various predetermined operating parameters of the engine and provides an output signal to a pressure regulator for controlling the pressure in the control fluid in response to the sensors (98A-98H).
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