초록

A turbojet engine one-shot start system utilizes ignition and fuel delivery system components capable of pneumatic actuation and pressurization to initiate the engine start sequence thereby obviating the need for expensive shielded electrical controls and pumps.

대표청구항 ▼

[ I claim:] [1.] A start system for a turbojet engine having a through-shaft fuel induction system and an engine control computer connected to a source of potential, said computer having means for producing a pulse width modulated fuel control signal comprising:a fuel tank capable of pressurization;

[ I claim:] [1.] A start system for a turbojet engine having a through-shaft fuel induction system and an engine control computer connected to a source of potential, said computer having means for producing a pulse width modulated fuel control signal comprising:a fuel tank capable of pressurization;a fuel injector disposed within said tank, said injector having a solenoid actuated valve connected to the means for producing the pulse width modulated signal;a pressure regulator connected to said tank, said regulator also connected to a pneumatic circuit;a compressed gas reservoir;a valve connected between said reservoir and said pressure regulator for releasing the compressed gas to said regulator;a bleed air circuit connected between said turbojet engine and said pressure regulator, said bleed air circuit having a check valve interposed between said regulator and said engine, the check valve being oriented to prevent gas flow in the direction of said engine;a pressure switch connected to said pneumatic circuit, said switch having means for closing an electrical circuit at a predetermined pressure connected between said source of potential and said computer whereby potential is supplied to said computer at a predetermined pressure;a rupture disk connected to said pneumatic circuit downstream of said pressure switch;a pneumatic cylinder connected to said pneumatic circuit downstream of said rupture disk, said cylinder having a slidably movable striker;and a pyrotechnic initiator connected to said engine, said initiator containing propellant and having a primer cavity disposed about a primer and telescoped over the striker of said cylinder, the propellant being disposed in proximity to the primer whereby ignition of the primer effects ignition of the propellant.