Method and apparatus for controlling fuel injection rate in internal combustion engine

An apparatus for controlling the fuel injection rate in an internal combustion engine, said internal combustion engine having a single fuel injector provided at a throttle body, having a throttle valve, said single fuel injector being adapted to inject a fuel into an intake passage so as to be mixed with intake air in said intake passage, thereby forming an air-fuel mixture for induction into a combustion chamber of said engine along said intake passage, said apparatus comprising:

• (a) start detecting means for detecting the engine being started up;
• (b) an intake air temperature detecting means provided at the intake passage for detecting intake air temperature;
• (c) an engine coolant temperature detecting means for detecting engine coolant temperature;
• (d) an engine speed detecting means for detecting engine speed;
• (e) a load detecting means for detecting engine load;
• (f) a first memory means for storing a start temperature correction value ADD corresponding to the intake air temperature at the time of start up of said engine;
• (g) a second memory means for storing a correction coefficient FWLO corresponding to the engine coolant temperature during the operation of said engine;
• (h) a computing means for computing a basic injection time duration TP in accordance with the engine speed detected by said engine speed detecting means and the load detected by said load detecting means;
• (i) a first storage means for storing the intake air temperature detected by said intake air temperature detecting means while said start detecting means is detecting that the engine is being started;
• (j) a subtracting means for subtracting a predetermined amount, in accordance with time elapsed after the starting of said engine, from said start temperature correction value ADD read out from said first memory means on the basis of the intake air temperature stored in said first storage means;
• (k) a second storage means for storing the latest subtraction result from said subtracting means;
• (l) a third storage means for storing the latest engine coolant temperature detected by said engine coolant temperature detecting means during the operation of said engine;
• (m) a correcting means for correcting said basic fuel injection time duration TP in accordance with said start temperature correction value ADD which has been read from said second storage means and said correction coefficient FWLO which has been read from said second memory means on the basis of said engine coolant temperature read from said third storage means;
• and
• (n) means for outputting an injection signal for driving said injector for a time duration corrected by said correcting means.

An apparatus for controlling the fuel injection rate in an internal combustion engine, said internal combustion engine having a single fuel injector provided at a throttle body, having a throttle valve, said fuel injector being adapted to inject a fuel into an intake passage so as to be mixed with intake air in said intake passage, thereby forming an air-fuel mixture which is then induced into a combustion chamber of said engine along said intake passage, said apparatus comprising:

• (a) start detecting means for detecting the engine being started up;
• (b) an intake air temperature detecting means provided at the intake passage for detecting the intake air temperature;
• (c) an engine coolant temperature detecting means for detecting an engine coolant temperature;
• (c) an engine speed detecting means for detecting the engine speed;
• (e) a load detecting means for detecting the engine load;
• (f) an acceleration detecting means for detecting the accelerating condition of said engine;
• (g) a first memory means for storing a start temperature correction value ADD corresponding to the intake air temperature at the time of start up of said engine;
• (h) a second memory means for storing a first warm-up acceleration correction coefficient FTCO corresponding to the condition of acceleration of said engine;
• (i) a third memory means for storing a second warm-up acceleration correction coefficient KTC corresponding to the engine coolant temperature during the operation of said engine;
• (j) a computing means for computing a basic injection time duration TP in accordance with the engine speed detected by said engine speed detecting means and the load detected by said load detecting means;
• (k) a first storage means for storing the intake air temperature detected by said intake air temperature detecting means while said start detecting means is detecting that the engine is being started;
• (l) a subtracting means for subtracting a predetermined amount, accordance with the time elapsed after the starting of said engine, from said start temperature correction value ADD read out from said first memory means on the basis of the intake air temperature stored in said first storage means;
• (m) a second storage means for storing the latest subtraction result from said subtracting means;
• (n) a third storage means for storing the latest acceleration of said engine, detected by said acceleration detecting means;
• (o) a fourth storage means for storing the latest engine coolant temperature;
• detected by said engine coolant temperature detecting means during the operation of said engine;
• (p) a correcting means for correcting the basic fuel injection time duration TP in accordance with said start temperature correction value ADD which is read out from said second storage means, said first warm-up acceleration correction coefficient FTCO which is read out from said second memory means on the basis of the condition of acceleration of said engine read out from said third storage means, and said second warm-up acceleration correction coefficient KTC which is read out from said third memory means on the basis of said engine coolant temperature read out from said fourth storage means;
• and
• (q) a means for producing an injection signal for driving said fuel injector for a time duration corrected by said correction means.

An apparatus for controlling the asynchronous fuel injection rate in an internal combustion engine, said internal combustion engine having a single fuel injector provided at a throttle body, having a throttle valve, said single fuel injector being adapted to inject a fuel into an intake passage so as to be mixed with intake air in said intake passage, thereby forming an air-fuel mixture for induction into a combustion chamber of said engine along said intake passage, said apparatus comprising:

• (a) start detecting means for detecting the engine being started up;
• (b) an intake air temperature detecting means for detecting the intake air temperature;
• (c) an acceleration detecting means for detecting an amount of acceleration of said engine;
• (d) a first memory means for storing a start temperature correction value ADD which corresponds to the intake air temperature at the time of start up of said engine and takes a greater value as said intake air temperature becomes lower;
• (e) a second memory means for storing asynchronous injection time duration TPasy corresponding to the amount of acceleration of said engine;
• (f) a first storage means for storing the engine start temperature detected by said intake air temperature detecting means when said start detecting means is detecting that said engine is being started;
• (g) a subtracting means for subtracting a predetermined amount, in accordance with the time elapsed after the start up of said engine, from said start temperature correction value ADD which is read out from said first memory means on the basis of said intake air temperature stored in said first storage means;
• (h) a second storage means for storing the latest subtraction result from said subtracting means;
• (i) a third storage means for storing the latest engine acceleration detected by said acceleration detecting means;
• (j) a correcting means for correcting, in accordance with said start temperature correction value ADD read out from said second storage means, the rate of asynchronous fuel injection which is read out of said second memory means in accordance with the amount of acceleration of said engine read out from said third storage mans;
• and
• (k) a means for producing an asynchronous injection signal for driving said fuel injector for a time duration corrected by said correcting means.