US 12,448,927 B2
Engine system
Norinosuke Nakatani, Kariya (JP); Yoshitaka Takeuchi, Kariya (JP); Takayuki Homma, Kariya (JP); Shohei Matsumoto, Kariya (JP); Hideaki Suzuki, Kariya (JP); Hidehito Kubo, Kariya (JP); Hiroyasu Kawauchi, Kariya (JP); and Makoto Koike, Nagakute (JP)
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
Appl. No. 18/724,496
Filed by KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Kariya (JP)
PCT Filed Oct. 31, 2022, PCT No. PCT/JP2022/040805
§ 371(c)(1), (2) Date Jun. 26, 2024,
PCT Pub. No. WO2023/127299, PCT Pub. Date Jul. 6, 2023.
Claims priority of application No. 2021-212080 (JP), filed on Dec. 27, 2021.
Prior Publication US 2025/0067225 A1, Feb. 27, 2025
Int. Cl. F02D 19/02 (2006.01); F02D 41/00 (2006.01); F02D 41/14 (2006.01); F02M 21/02 (2006.01)
CPC F02D 19/025 (2013.01) [F02D 19/029 (2013.01); F02D 41/0002 (2013.01); F02D 41/1454 (2013.01); F02D 41/1461 (2013.01); F02M 21/0206 (2013.01); F02M 21/0227 (2013.01); F02D 2200/0606 (2013.01); F02D 2200/101 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An engine system comprising:
an engine in which fuel combusts with hydrogen;
an intake passage through which air supplied to the engine flows;
an exhaust passage through which exhaust gas generated in the engine flows;
a first flow rate control valve provided on the intake passage and configured to control a flow rate of air supplied to the engine;
a first fuel supply valve configured to supply the fuel to the engine;
a reformer including a catalyst for decomposing the fuel into the hydrogen and configured to reform the fuel to generate a reformed gas containing the hydrogen;
an air flow path through which air supplied to the reformer flows;
a second flow rate control valve provided on the air flow path and configured to control a flow rate of air supplied to the reformer;
a second fuel supply valve configured to supply the fuel to the reformer;
a reformed gas flow path through which the reformed gas generated by the reformer flows toward the engine;
a temperature detection unit configured to detect a temperature of the reformed gas flowing through the reformed gas flow path;
a rotation fluctuation detection unit configured to detect an amount of rotation fluctuation of the engine; and
a deterioration detection unit configured to detect whether reforming performance of the catalyst of the reformer is deteriorated or not based on detection values of the temperature detection unit and the rotation fluctuation detection unit,
wherein when, in an idling period of the engine, the amount of rotation fluctuation of the engine is equal to or greater than a second threshold in a state where the temperature of the reformed gas is equal to or higher than a first threshold, the deterioration detection unit determines that the reforming performance of the catalyst is deteriorated.