Injection supply device for internal combustion engine, with electronic control

Claim 1

A fuel supply device for an internal combustion engine comprising: at least one electrically controlled fuel injector arranged for feeding fuel under pressure into intake means of the engine when electrically energized; and means for delivering electrical energization pulses to said injector, having a plurality of sensors providing electric signals representative of values of operating parameters of the engine including the running speed and the temperature thereof and an electronic control circuit having inputs connected to receive said electric signals, including means for applying to said injector periodic electric energization signals which are synchronized with operation of the engine, have a rate proportional to the running speed of said engine and have a duty ratio which is varied responsive to said operating parameters and means for substituting said synchronized energization signals with signals which are non-synchronous with the engine until the running speed of the engine has reached a predetermined threshold value indicating that the engine is self operative, said non-synchronous signals having a rate higher by at least one order of magnitude than the rate of said synchronous signal at the same running speed, said substituting means including a non-volatile memory storing a table providing the values of the frequency and of the duty ratio of said non-synchronous signals as a function of the electric signal representative of the temperature of the engine.