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CONTROLLER AND CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE

  • US 20180087459A1
  • Filed: 02/14/2017
  • Published: 03/29/2018
  • Est. Priority Date: 09/27/2016
  • Status: Active Grant
First Claim
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1. A controller for an internal combustion engine that is provided with a plurality of detected units provided in a rotation member, which rotates integrally with a crankshaft, at a plurality of preliminarily set crank angles, and a specific crank angle sensor which is fixed to a nonrotation member and detects the detected unit, the controller for an internal combustion engine comprising:

  • an angle information calculator that detects a crank angle based on an output signal of the specific crank angle sensor, and calculates a crank angle speed which is a time change rate of the crank angle, and a crank angle acceleration which is a time change rate of the crank angle speed;

    a torsional torque calculator that calculates a maximum value of a torsional vibration torque which is a vibration component of a torsional torque produced by torsion of the crankshaft, based on the crank angle acceleration in a combustion period, and calculates a value which has an amplitude of the maximum value of the torsional vibration torque and vibrates with a preliminarily set natural angular frequency of the torsional vibration, as the torsional vibration torque in the combustion period; and

    a cylinder internal pressure estimator that calculates a combustion gas pressure torque produced by combustion, by use of an equation of motion of a rotation system of the crankshaft containing piston, connecting rod, and crank of the internal combustion engine, based on the crank angle, the crank angle acceleration, and the torsional vibration torque, and estimates a cylinder internal pressure of a combustion cylinder, based on the combustion gas pressure torque and the crank angle.

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