Full open throttle control for internal combustion engine

Abstract

Maintaining maximum power at wide-open throttle in a fuel injection type of internal combustion engine having a computer receiving input from (1) an accelerator pedal, (2) a pressure-drop sensor across the air intake-throttle, and (3) an engine-speed sensor, the computer producing output controlling an actuator that controls the position of the throttle and controlling a valve that controls the instantaneous amount of fuel being injected. The movement of the throttle towards its wide-open position is stopped just before it reaches that position where an accurate reading of pressure drop across the throttle can be and is being obtained. Substantially instantaneously, the airflow and proper air-fuel flow ratio are calculated for the stopped position while the throttle movement is checked. From these calculated amounts and the known relationship of the stoped position to the wide-open position, the computer then calculates what the airflow will be at the wide-open throttle position and then determines what the fuel flow should be, given the stored and desired air-fuel ratio. Then the throttle is advanced to its wide-open position, while simultaneously, the computer acts on the basis of the calculated airflow and fuel flow for the wide-open position to generate the flow relationship of fuel and air for the engine.