JPS6367643U - - 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. DESCRIPTION OF SYMBOLS 1... Engine, 5... Throttle valve, 6... Fuel injection valve, 14... Control unit, 15... Throttle sensor, 16... Idle switch, 17... Crank angle sensor, 20... _O2 sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] Engine operating state detection means for detecting engine operating states including at least parameters related to the amount of air taken into the engine; air-fuel ratio detection means for detecting; 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; and basic fuel injection amount setting means for setting the basic fuel injection amount for all areas of the engine operating state. A rewritable uniform learning correction coefficient storage means that stores a uniform learning correction coefficient for uniformly correcting the quantity, and a learning correction coefficient for each area for correcting the basic fuel injection quantity for each area of the engine operating state. rewritable area-based learning correction coefficient storage means; and area-based learning correction for retrieving the area-based learning correction coefficient of the area of the corresponding engine operating state from the area-based learning correction coefficient storage means based on the actual engine operating state. a coefficient searching means, and a feedback correction coefficient for comparing the air-fuel ratio detected by the air-fuel ratio detecting 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 that increases or decreases 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 uniform learning correction coefficient for each area. a fuel injection amount calculation means for calculating the fuel injection amount based on the area-specific learning correction coefficient searched by the learning correction coefficient search means and the feedback correction coefficient set by the feedback correction coefficient setting means; A fuel injection means for injecting and supplying fuel to a gathering part of an engine intake passage in an on-off manner according to a drive pulse signal corresponding to the calculated fuel injection amount, and an intake air flow rate for increasing the opening of the throttle valve at each engine speed. 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 of an air-fuel ratio of an internal combustion engine, comprising: a learning correction coefficient correcting means; and a uniform learning prohibiting means for uniformly prohibiting learning by the learning correction coefficient correcting means until a predetermined time has elapsed after acceleration. Control device.