Multiprocessing microprocessor based engine control system for an internal combustion engine

Claim 1

A multiprocessing microprocessor based fuel injection system for an internal combustion engine comprising: power supply receiving means adapted to receive power upon demand of the engine operator and to receive standby voltage during engine non-operating times; a plurality of sensors adapted to be mounted on the engine, each of said sensors providing an output electrical signal representing one of a plurality of engine operating conditions; A/D converter means for converting said output signals from said sensors into digitally equivalent signals; injector means mounted on the engine upstream of the intake valves of the engine; fuel supply means including a fuel pump adapted to supply fuel to said injector means; programmable read only memory (PROM) means for storing control law constants and data signals representative of predetermined engine calibrations unique to the engine, and a first and second microprocessor having storage means therein, said first microprocessor having a master control program stored in its storage means and receiving input signals from said programmable read only memory means and both of said microprocessors electrically connected together in a multiprocessing configuration for shared computational operation according to input signals provided by said sensors, said programmable read only memory means and predetermined data in said storage means for calculating fuel quantity electrical signals to operate said injector means from said first microprocessor and said fuel pump from said second microprocessor.