JPS6365836U - - 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 arithmetic processing contents, Fig. 10 is a diagram showing a learning area for uniform learning correction coefficients, Fig. 11 FIG. 2 is a diagram showing how the feedback correction coefficient changes. 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 fuel into the engine on and off in response to a drive pulse signal corresponding to the fuel injection amount calculated by , and an intake air flow rate that almost does not change with respect to changes in the opening of the throttle valve at each engine speed. uniform learning area detection means for detecting a predetermined area; and when the uniform learning area detection means detects the predetermined area, learning the deviation of the feedback correction coefficient from a reference value; uniform learning correction coefficient correction means for setting a new uniform learning correction coefficient by adding this deviation to the learning correction coefficient by a predetermined ratio, and rewriting the uniform learning correction coefficient in the uniform learning correction coefficient storage means; When the area detecting means does not detect that the area is in the predetermined area, the deviation from the reference value of the feedback correction coefficient is learned for each area of the engine operating state, and this deviation is added to the current learning correction coefficient for each area. an area-specific learning correction coefficient correction means for setting a new area-specific learning correction coefficient by adding a percentage, and correcting and rewriting the area-specific learning correction coefficient in the area-specific learning correction coefficient storage means; An air-fuel ratio learning control device for an internal combustion engine, characterized in that, where MALT is the addition ratio in the uniform learning correction coefficient correction means, and MMAP is the addition ratio in the area-specific learning correction coefficient correction means, MALT>MMAP.