JPS6367642U - - 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, Figs. 3 to 9 are flowcharts showing the calculation processing contents, Fig. 10 is a diagram showing the learning area for uniform learning correction coefficients, Fig. 11 FIG. 2 is a diagram showing how the feedback correction coefficient changes. DESCRIPTION OF SYMBOLS 1... Engine, 5... Throttle valve, 6... Fuel injection valve, 14... Control unit, 15... Throttle sensor, 17... Crank angle sensor, 20... _O2
sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] Engine operating state detection means for detecting the engine operating state including at least parameters related to the amount of air taken into the engine; air-fuel ratio detection means for detecting a fuel ratio; basic fuel injection amount setting means for setting a basic fuel injection amount based on the parameter detected by the engine operating state detection means; A rewritable uniform learning correction coefficient storage means storing a uniform learning correction coefficient for uniformly correcting the injection amount, and an area-specific learning correction coefficient for correcting the basic fuel injection amount for each area of the engine operating state. Area-specific learning that searches for area-specific learning correction coefficients of areas with corresponding engine operating conditions from the stored rewritable area-specific learning correction coefficient storage means and the area-specific learning correction coefficient storage means based on the actual engine operating conditions. a correction coefficient search means; and a feedback correction coefficient for comparing the air-fuel ratio detected by the air-fuel ratio detection means with a target air-fuel ratio and correcting the basic fuel injection amount so as to bring the actual air-fuel ratio closer to the target air-fuel ratio. a feedback correction coefficient setting means for increasing or decreasing by a predetermined amount the basic fuel injection amount set by the basic fuel injection amount setting means, the uniform learning correction coefficient stored in the uniform learning correction coefficient storage means, and the area. a fuel injection amount calculation means for calculating a fuel injection amount based on the area-specific learning correction coefficient searched by the separate learning correction coefficient search means and the feedback correction coefficient set by the feedback correction coefficient setting means; and the fuel injection amount calculation means A fuel injection means that injects and supplies fuel to the collection part of the engine intake passage on and off in response to a drive pulse signal corresponding to the fuel injection amount calculated by uniform learning region detection means for detecting a predetermined region in which there is almost no change; and when the uniform learning region detection means detects that the predetermined region is within the predetermined region, learning the deviation of the feedback correction coefficient from a reference value. uniform learning correction coefficient correcting means for correcting and rewriting the uniform learning correction coefficient of the uniform learning correction coefficient storage means in a direction to decrease the uniform learning correction coefficient; At this time, the area-by-area learning correction coefficient in the area-by-area learning correction coefficient storage means is corrected and rewritten in the direction of learning the deviation from the reference value of the feedback correction coefficient for each area of the engine operating state and decreasing the deviation. learning correction coefficient correction means; and uniform learning prohibition means for detecting a predetermined distribution deterioration region based on the engine speed and throttle valve opening and uniformly prohibiting learning by the learning correction coefficient correction means in this region. An air-fuel ratio learning control device for an internal combustion engine, characterized in that: