Method of and apparatus for fuel control

Claim 1

A fuel control method for an internal combustion engine provided with a fuel injection system comprising an intake passage communicating with an air cleaner and cylinders of the engine, a throttle valve pivotally mounted around a throttle valve shaft, and two fuel injectors arranged on a plane crossing said throttle valve shaft at right angles and on a upstream side of said throttle valve so that said throttle valve shaft is disposed between said two injectors, the method comprising the steps of: obtaining, from a map, fuel injection share correction coefficient, based on an opening position of the throttle valve and revolutions per unit time of said engine; correcting amounts of fuel to be injected by said respective fuel injectors in dependence upon said fuel injection share correction coefficient so that the fuel amount to be injected by one of said fuel injectors increases by an amount determined on a basis of said fuel injection share correction coefficient and the fuel amount to be injected by the other said fuel injectors decreases by the same amount as the same of fuel increases; and injecting an amount of fuel determined by the above step into said intake passage by said fuel injectors, alternately, so that the cylinders each receive an optimum amount of fuel.

Claim 4

A method of fuel control for an internal combustion engine with an intake passage for introducing air from an air cleaner into the engine, said intake passage having a throttle valve pivotable around a throttle valve shaft and two fuel injectors arranged upstream of said throttle valve in parallel to an air flow so as to be positioned on opposite sides of said throttle valve shaft, the method comprising the steps of obtaining the amounts of fuel for the two fuel injectors based on a fuel injection share correction coefficient stored in advance in a map and determined by data including an opening of the throttle valve and number of revolutions of the engine per unit time, and injecting fuel by said two fuel injectors alternately on the basis of the obtained fuel injection coefficient so that the respective engine cylinders are supplied with an optimum fuel supply.

Claim 5

A method of fuel control for an internal combustion engine with an intake passage for introducing air from an air cleaner into the engine, said intake passage having a throttle valve pivotable around a throttle valve shaft and two fuel injectors arranged upstream of said throttle valve in parallel to an air flow so as to be positioned on opposite sides of said throttle valve shaft, the method comprising the steps of obtaining the amounts of fuel for the two fuel injectors based on a fuel injection share correction coefficient stored in advance in a map and determined by data including an opening of the throttle valve and number of revolutions of the engine per unit time, and injecting fuel by said two fuel injectors alternately on the basis of the obtained fuel injection coefficient so that the respective engine cylinders are supplied with an optimum fuel supply.