Magnetic trigger device for two group fuel injection system

Claim 1

In a fuel injection system for an internal combustion engine a magnetic timing device for generating group timing signals to the injectors, said device comprising: a rotatable shaft operatively coupled to the crankshaft of the engine; a non-magnetic disc member connected to said shaft for rotating thereby; a bar magnet having a cross-sectional area substantially less than said disc and located in said disc near the periphery thereof, said magnet positioned so that its magnetic axis is parallel to said shaft; a pair of spaced apart magnetizable ferrite members, each of said members having an arcuate length of 180° and positioned for allowing said magnet to pass along a path therebetween during a revolution of said disc; a reed switch positioned to be magnetically actuated by said magnet during the time said magnet is moving between said members, said switch having an input and an output; a source of power electrically connected to the input of said reed switch; and a circuit means including two output lines electrically connected to the output of said switch and an inverter means for generating a first output signal on one output line when said switch is closed and through said inverter means for generating a second output signal when said switch is open.