Control method and apparatus for combustion motors

Claim 1

Apparatus for producing a control signal for modifying the duration of an injection signal of a fuel injection system of a combustion motor comprising sensor means adapted for measuring first and second operating parameters of the motor and producing corresponding first and second analog signals respectively representative thereof, means including multiplexing means for sequentially and alternately converting each of said first and second analog signals into respective third and fourth signals each having a duration representative of the corresponding first and second analog signals, means responsive to the duration of each of said third and fourth signals for producing respective first and second groups of pulses having a number representative of the duration of the respective third and fourth signals, processing means for sequentially receiving said first and second groups of pulses representative of each said third and fourth signals and alternately producing a respective first and second coded word in response to each said first and second group of pulses, programmed memory means alternately receiving each said first and second coded words and alternately producing a respective first and second output word corresponding thereto, each said first and second output word being respectively representative of the measured first and second engine parameters and transcoder means for alternately transforming each first and second output word into a respective control signal of predetermined time duration for modifying the duration of the injection signal for the fuel injection system.