Single point fuel injected internal combustion engine and method of operating same

Claim 1

In a multi-cylinder internal combustion engine having an ignition system, a crankshaft and a single fuel injector for forming the air-fuel mixture fed to the multiple cylinders of said engine, the combination of: means for producing pulses at a first rate which pulses define a first pulse train signal; means for producing pulses at a second rate which is lower than said first rate and which pulses define a second pulse train signal; a fuel injection control circuit operatively connected to said single fuel injector for controlling the injections thereof; and a circuit responsive to one of the speed of said engine and the load of said engine and which selectively supplies said first pulse train signal to said fuel injection control circuit when said one of said engine speed and engine load is below a predetermined level and which selectively supplies said second pulse train signal to said fuel injection control circuit when said one of said engine speed and engine load are above said predetermined level and which induces said single fuel injector to inject fuel in synchronism with the pulses of the selected one of said first and second pulse train signals, said first and second pulse producing means taking the form of a disc operatively connected to said crankshaft for synchronous rotation therewith, said disc having first and second sets of markers thereon; and first and second pickups juxtaposed said disc to be respectively responsive to the movement of said first and second markers.