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Intake air flow rate detection for internal combustion engine

  • US 8,161,743 B2
  • Filed: 09/10/2008
  • Issued: 04/24/2012
  • Est. Priority Date: 10/19/2007
  • Status: Active Grant
First Claim
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1. An intake air flow rate detection device for an internal combustion engine, the engine comprising an intake passage through which intake air flows, a supercharging device that supercharges the intake air, a throttle that throttles the intake air downstream of the supercharging device, a bypass passage that bifurcates between the supercharging device and the throttle and converges with the intake passage upstream of the supercharging device, and a bypass valve that opens and closes the bypass passage, the detection device comprising:

  • a sensor that detects an operating condition of the internal combustion engine;

    an air flow meter disposed in the intake passage upstream of the supercharging device; and

    a programmable controller programmed to;

    calculate a measured intake air flow rate from a detection value of the air flow meter;

    calculate a calculated intake air flow rate from the operating condition of the internal combustion engine; and

    employ either the measured intake air flow rate or the calculated intake air flow rate as an intake air flow rate of the intake passage on the basis of a bypass air flow rate, which is a flow rate of air that is circulated to the intake passage between the air flow meter and the supercharging device through the bypass passage,wherein the controller is further programmed to employ the measured intake air flow rate when the bypass air flow rate is not greater than a threshold value, and employ the calculated intake air flow rate when the bypass air flow rate is greater than the threshold value, the threshold value being a non-zero value beyond which the bypass air flows back to the air flow meter.

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