JPH01134746U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a functional block diagram showing the configuration of the present invention.
Fig. 2 is a system diagram showing an embodiment of the present invention, Fig. 3 is a flowchart showing a fuel injection amount calculation routine in the above embodiment, and Fig. 4 is an air-fuel ratio feedback correction coefficient LAMBD in the above embodiment.
FIG. 5 is a flowchart showing the effective opening area map correction routine in the above embodiment. FIG. 6 is a graph showing two judgment operation states in the above embodiment. The figure is a time chart showing changes in the air-fuel ratio feedback correction coefficient LAMBDA, Figure 8 is a graph showing changes in effective opening area A with respect to throttle valve opening θ, and Figure 9 is a graph showing changes in the effective opening area A when the area around the throttle valve is dirty. Graph showing the rate of change of effective opening area A with respect to valve opening degree θ, No. 10
The figure is a graph for explaining the enrichment of the air-fuel ratio due to the influence of dirt around the throttle valve. DESCRIPTION OF SYMBOLS 1... Engine, 4... Throttle valve, 6... Fuel injection valve, 12... Control unit, 13... Throttle valve opening sensor, 14... Crank angle sensor, 16
... _O2 sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] Throttle valve opening detection means for detecting the opening of a throttle valve installed in an intake passage of an engine; engine rotational speed detection means for detecting the rotational speed of the engine; basic fuel injection amount setting means for setting the intake air flow rate of the engine in the relevant operating state based on the detected values of engine speed and engine rotational speed, and setting the basic fuel injection amount based on the intake air flow rate; an air-fuel ratio detecting means for detecting the air-fuel ratio of an engine intake air-fuel mixture; and comparing the air-fuel ratio detected by the air-fuel ratio detecting means with a target air-fuel ratio to bring the actual air-fuel ratio closer to the target air-fuel ratio. a feedback correction value setting means for increasing or decreasing a feedback correction value by a predetermined amount to correct the basic fuel injection amount; and at least the basic fuel injection amount set by the basic fuel injection amount setting means and the feedback correction value. a fuel injection amount setting means for setting the fuel injection amount based on the feedback correction value set by the value setting means; a predetermined low-load, low-speed operating state and a predetermined low-load, high-speed operating state in which a basic fuel injection amount substantially equivalent to the operating state is set by the basic fuel injection amount setting device; Judgment operation state detection means for detecting two judgment operation states that are rotational operation states; and learning the deviation of the feedback correction value from a reference value in each of the two judgment operation states detected by the judgment operation state detection means. a deviation learning storage means for storing the difference, and a modification permission determining means for determining permission to modify the basic fuel injection amount when the deviations in each of the two determined driving states stored in the deviation learning storage means are substantially equal; Based on the deviation in the predetermined low-load, low-speed operation state stored in the deviation learning storage means when the modification permission determination means determines whether modification is permitted, the basic fuel injection amount setting means in the predetermined low-load, low-speed operation state; a setting error estimating means for determining a setting error and estimating and setting a setting error in all operating states based on the setting error; and setting the basic fuel injection amount based on the setting error in all operating states estimated by the setting error estimating means. An electronically controlled fuel injection system for an internal combustion engine, comprising: basic fuel injection amount correcting means for correcting the set amount of basic fuel injection amount by the means.