×

Engine control system

  • US 4,836,174 A
  • Filed: 02/02/1988
  • Issued: 06/06/1989
  • Est. Priority Date: 02/06/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. An internal combustion engine comprising:

  • an engine body;

    an intake system connected to the engine body for introducing air thereto, the system including a throttle valve for controlling the amount of air introduced;

    an exhaust system connected to the engine body for removing resultant Combustion gas therefrom;

    further comprising passageway means for connecting the exhaust system and the intake system for recirculating an amount of exhaust gas from the exhaust system to the intake system;

    first sensor means arranged in the intake system at a position downstream of the throttle valve for detecting intake pressure;

    calculating means for calculating, from the detected intake pressure, a basic value of an engine characteristic concerning an amount of new air introduced into the engine for obtaining a predetermined value of said engine characteristic as desired;

    second sensor means arranged in the intake system at a position downstream of the throttle valve, said sensor providing an electrical signal indicating the partial pressure of oxygen in the introduced air;

    correcting means, responsive to the sensed value of partial pressure of oxygen in the introduced air, for obtaining a corrected basic value of said engine operational characteristic to attain a precise control of the engine characteristic to the desired value; and

    control means for controlling the engine operational characteristic to obtain the corrected engine operating characteristic value, wherein said correcting means comprises a map means for storing values of an oxygen pressure in accordance with values of an intake pressure, means for interpolating, from the map, a value of the oxygen partial pressure corresponding to the sensed oxygen partial pressure, and means for correcting the basic characteristic value from the difference between the detected oxygen partial pressure and the interpolated oxygen pressure.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×