Electric control apparatus for fuel injection pumps

An electric control apparatus for fuel injection pumps of an internal combustion engine comprising:

• a fuel injection pump;
• fuel flow sensor means for generating a fuel flow signal indicative of a net quantity of fuel flow supplied to said fuel injection pump;
• operating condition sensor means for detecting operating condition parameters of said engine and generating detection signals;
• servo means for actuating a fuel injection quantity controlling element of said fuel injection pump which controls the quantity of fuel injected by said fuel injection pump;
• electric control circuit means including means for computing an actual fuel injection quantity and generating an actual fuel injection quantity indicative signal, means for computing a desired fuel injection quantity in accordance with the fuel flow signal from said fuel flow sensor means and the detection signals from said operating condition sensor means and generating a desired fuel injection quantity indicative signal, means for receiving the actual fuel injection quantity indicative signal and said desired fuel injection quantity indicative signal, detecting a difference between both signals and generating an error signal corresponding to the difference, and a drive circuit responsive to the error signal to energize said servo means and thereby to actuate said fuel injection quantity controlling element of said fuel injection pump, thereby controlling the actual fuel injection quantity at said desired fuel injection quantity;
• and
• feedback means for generating a feedback signal in proportion to a differentiation of an actuation output of said servo means and algebraically adding the feedback signal to the desired fuel injection quantity indicative signal received by said error signal generating means.