Electronically controlled fuel injection system for rotary internal combustion engines

Claim 1

In combination, a rotary internal combustion engine and an electronically controlled fuel injection system for said rotary internal combustion engine comprising: a fuel injection control valve for controlling fuel injection into said engine; actuating means for opening said fuel injection control valve when said actuating means is energized; a triggering pulse signal generator operatively connected to a crank shaft of said engine and responsive to the angular position of said crank shaft to produce two alternating triggering pulse signals each representing fuel injection commencement time; first electronic computing means responsive to at least one of electric signals representing prevailing values of engine deceleration operation including engine speed, throttle opening and intake manifold vacuum to produce an electric engine deceleration operation signal; electronic control means; cut-off means for cutting off one of said alternating triggering pulse signals in response to said engine deceleration operation signal, said cut-off means comprising an electromagnetic relay including a pair of relay contacts which are opened by the movement of a relay armature when a relay coil is energized by said engine deceleration operation signal form said first electronic computing means, said relay contacts being closed by said relay armature when said engine deceleration operation signal is absent, said cut-off means being connected between output terminals of said triggering pulse signal generator and said electronic control means and being operative to prevent transmission therethrough of one of said alternating triggering pulse signals when said relay coil is energized; second electronic computing means responsive to at least one of electric signals representing prevailing values of engine speed, throttle opening, engine temperature and intake manifold vacuum to produce an electric output pulse signal having a pulse width representing the proper duration of fuel injection under prevailing engine operating conditions; and said electronic control means being responsive to said output pulse signal from said second electronic computing means and said alternating triggering pulse signals to produce an electric command pulse signal which is fed into said actuating means energizing said actuating means to open said fuel injection control valve.