Device, method, and program for estimating intake air amount

Abstract

A device, a method, and a program for estimating an intake air amount. The device for estimating the intake air amount used for providing the intake air amount of an internal combustion engine having a variable valve mechanism comprises a reference value acquisition means for providing an intake air amount reference value from a specified map based on the rotational speed, valve lift, and valve phase angle of the internal combustion engine, a measurement value acquisition means for providing a measurement value according to the output of an air flow meter installed in the intake pipe of the internal combustion engine, a calculation means for providing a correction factor to minimize a deviation between a value obtained by multiplying the intake air amount reference value by the correction factor and the measurement value, and an estimated value calculation means for calculating an estimated intake air amount value by multiplying the provided correction factor by the intake air amount reference value.

Description

technical field [0001] The present invention relates to a device for filtering the output of an air flow meter, in particular to a device for removing pulsation components contained in the output value of the air flow meter. Background technique [0002] There is a throttle valve in the intake pipe of the internal combustion engine, and the amount of inhaled air is controlled by adjusting the opening of the throttle valve. Since the throttle valve is a ventilation resistance, when the opening degree is small, a negative pressure is formed in the intake pipe and the air intake efficiency decreases. Therefore, in recent years, a throttleless reciprocating engine that does not use a throttle has been developed. [0003] The non-throttle engine uses a variable valve lift mechanism and a variable valve phase mechanism to control the amount of intake air by adjusting the valve lift amount and valve opening and closing timing. As disclosed in Japanese Patent Application Laid-Open...

AI Technical Summary

Problems solved by technology

[0007] However, in the method of obtaining the moving average of the measured values ​​and smoothing the amplitude, as shown in Fig. 6, a delay occurs in the transient response

Calculating the fuel injection amount based on the delayed value will result in an air-fuel ratio that is too lean or too rich, increasing emissions and deteriorating drivability

[0008] In the method of Japanese Patent Laid-Open No. 5-306643, it is necessary to set the number of filters according to the conditions of the engine, and the data setting is very time-consuming

In addition, for systems that generate pulsating components in a wide range from low flow rates to high flow rates, it is difficult to determine whether the output value is in a steady state or a transient state to set the order of the filter

[0009] In addition, in the case of a non-throttle engine without a throttle, since the pressure inside the intake pipe is the same as the atmospheric pressure, there is no correlation with the amount of engine intake air, and the method in JP-A-2004-156456 cannot be used.

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