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Control device for internal combustion engine and measuring device of mass flow rate of NOx recirculated to intake passage with blowby gas

  • US 8,469,010 B2
  • Filed: 01/28/2010
  • Issued: 06/25/2013
  • Est. Priority Date: 01/28/2010
  • Status: Expired due to Fees
First Claim
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1. A measuring device that is a device for measuring a mass flow rate of NOx recirculated to an intake passage with a blowby gas in an internal combustion engine in which the blowby gas is recirculated to the intake passage, comprising:

  • a NOx sensor attached to a downstream side from a position where the blowby gas is recirculated in said intake passage;

    an air flowmeter attached to an inlet port of said intake passage; and

    a signal processing device that processes each of signals from said NOx sensor and air flowmeter,wherein said signal processing device includes;

    a NOx concentration measuring unit that converts a signal from said NOx sensor into a NOx concentration;

    an oxygen concentration measuring unit that converts the signal from said NOx sensor into an oxygen concentration;

    a fresh air mass flow rate measuring unit that converts a signal from said air flowmeter into a mass flow rate of fresh air;

    a blowby gas mass flow rate calculating unit that calculates a mass flow rate of the blowby gas recirculated to said intake passage from the oxygen concentration and the mass flow rate of the fresh air;

    an all gas mass flow rate calculating unit that calculates a mass flow rate of all gases in said intake passage from the mass flow rate of the fresh air and the mass flow rate of the blowby gas; and

    a NOx mass flow rate calculating unit that calculates a mass flow rate of NOx in said intake passage from the mass flow rate of all the gases and the NOx concentration.

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