Measurement control device and flow volume measuring device

A measurement control device configured to measure an air flow rate using an output value of a sensing portion that outputs a signal according to a flow rate of air to be drawn into an internal combustion engine, to output a measurement result of the air flow rate to a predetermined external device, the measurement control device comprising:

• a pulsation state calculator that calculates a pulsation state, which is a state of pulsation generated in the air flow rate, using the output value;
• a flow rate correcting unit that corrects the air flow rate using the pulsation state calculated by the pulsation state calculator;
• and
• a filter unit that removes a component having a predetermined cutoff frequency from a waveform representing a time change of the output value, wherein
• a frequency of a waveform representing a time change of rotation speed of the internal combustion engine is defined as a rotation fluctuation frequency, and
• the cutoff frequency is set to a positive real number multiple of the rotation fluctuation frequency.

A flow volume measuring device configured to measure an air flow rate, comprising:

• a measurement channel having a measurement inlet through which air flows in and a measurement outlet through which the air flows out;
• a sensing portion that outputs a signal according to the flow rate of the air in the measurement channel;
• and
• a measurement control unit that measures the air flow rate using the output value of the sensing portion and outputs the measurement result of the air flow rate to a predetermined external device, wherein
• the measurement control unit has
• a pulsation state calculator that calculates the pulsation state, which is a state of pulsation generated in the air flow rate, by using the output value instead of acquiring an output value from the external device, and
• a flow rate correcting unit that corrects the air flow rate using the pulsation state calculated by the pulsation state calculator.