US 11,703,418 B2
Controller for internal combustion engine
Tatsuhiko Takahashi, Kobe (JP); Yuhei Matsushima, Tokyo (JP); Junichi Inoue, Tokyo (JP); Toshikatsu Saito, Tokyo (JP); Keiichi Arita, Tokyo (JP); and Kazuyo Kako, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on Mar. 21, 2022, as Appl. No. 17/699,449.
Claims priority of application No. 2021-083588 (JP), filed on May 18, 2021.
Prior Publication US 2022/0373431 A1, Nov. 24, 2022
Int. Cl. F02D 41/00 (2006.01); G01M 15/06 (2006.01); F02D 41/28 (2006.01)
CPC G01M 15/06 (2013.01) [F02D 41/009 (2013.01); F02D 41/28 (2013.01); F02D 2041/286 (2013.01); F02D 2200/024 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A controller for internal combustion engine, comprising at least one processor configured to implement:
an angle information detector that detects a crank angle and an angle period which is a period of unit angle of a crankshaft, based on an output signal of a crank angle sensor;
a torsional vibration determiner that determines whether a torsional vibration occurs in the crankshaft, based on the angle period;
an angle information calculator that calculates a crank angle acceleration, based on the angle period;
a gas pressure torque calculator that calculates a gas pressure torque in burning which is generated by a gas pressure in cylinder when air-fuel mixture is burning, at each crank angle of arithmetic object, based on the crank angle acceleration;
a combustion state estimator that estimates a combustion state of an internal combustion engine, based on the gas pressure torque in burning; and
a combustion controller that changes at least one or both of an ignition timing and an EGR amount, based on the combustion state,
wherein when it is determined that the torsional vibration occurred, the combustion state estimator stops estimation of the combustion state, and the combustion controller stops change of at least one or both of the ignition timing and the EGR amount based on the combustion state.