Electronically controlled fuel injection system for rotary engines

Claim 1

An electronically controlled fuel injection system associated with a rotary combustion engine comprising: a plurality of fuel injection valves for supplying fuel to the engine; actuating means for actuating each of said fuel injection valves when said means are energized; an electric circuitry device which comprises an engine driven triggering means having a cam coupled with a crank shaft of said engine and two contacts of a triggering switch which are alternately connected and disconnected with each other in dependence on the revolution of said crank shaft to produce alternate pulse signals and an electric switching circuit responsive to said alternate pulse signals from said engine driven triggering means to produce sequential triggering pulse signals; electronic computing means receiving input signals from at least one of an engine speed sensor, a throttle opening sensor, an engine temperature sensor and an intake pipe pressure sensor to produce an electronic output pulse signal having a pulse width representing a proper duration for fuel injection and corresponding at all times to prevailing engine operating conditions; and electronic control means responsive to said output pulse signal from said computing means and said sequential triggering pulse signals from said electric switching circuit of said electric circuitry device to produce sequential command pulse signals which are fed to said actuating means to thereby sequentially actuate said fuel injection valves, wherein said electric switching circuit has first and second transistor circuits which are rendered non-conductive when said contacts of said triggering switch are closed so that no triggering pulse voltage signal appears at a first output terminal of said electric circuitry device and wherein said electric switch circuit has a third transistor circuit which is rendered conductive when said contacts are closed and a triggering pulse voltage signal is delivered from said third transistor circuit to a second output terminal of said electric circuitry device, and said first and second transistor circuit being rendered conductive, to deliver a triggering pulse voltage signal to said first output terminal, when said contacts are open and simultaneously said third transistor circuit is rendered nonconductive so no triggering pulse voltage signal is delivered to said second output terminal wherein said electronic control means has at least two AND circuit simultaneously receiving said electronic output pulse signal from said electronic computing means and, respectively, receiving said triggering pulse voltage signals from said first and second output terminals of said electric circuitry device to thereby sequentially deliver command pulse signals to said actuating means.