US 12,435,677 B2
Two-stroke engine assembly having a catalytic converter and method for controlling same
Bruno Schuehmacher, Richmond (CA); Sebastien Thibault, Sherbrooke (CA); Marc Giguere, Magog (CA); Vincent Gamache, Granby (CA); Luc Champigny, Racine (CA); and Claude Fortin, St-Denis-de-Brompton (CA)
Assigned to BOMBARDIER RECREATIONAL PRODUCTS INC., Valcourt (CA)
Appl. No. 18/714,597
Filed by BOMBARDIER RECREATIONAL PRODUCTS INC., Valcourt (CA)
PCT Filed Nov. 30, 2022, PCT No. PCT/IB2022/061614
§ 371(c)(1), (2) Date May 30, 2024,
PCT Pub. No. WO2023/100114, PCT Pub. Date Jun. 8, 2023.
Claims priority of provisional application 63/284,155, filed on Nov. 30, 2021.
Prior Publication US 2025/0027459 A1, Jan. 23, 2025
Int. Cl. F02D 41/10 (2006.01); F02D 13/02 (2006.01); F02D 41/02 (2006.01); F02D 41/40 (2006.01); F02P 5/15 (2006.01)
CPC F02D 41/40 (2013.01) [F02D 13/0242 (2013.01); F02D 41/024 (2013.01); F02P 5/1502 (2013.01); F02D 2200/0802 (2013.01); F02D 2400/04 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for controlling a two-stroke engine assembly, the two-stroke engine assembly comprising a two-stroke internal combustion engine (ICE); and an exhaust system fluidly connected to the ICE, the exhaust system comprising a tuned pipe and a catalytic converter, the catalytic converter being disposed in one of a converging portion of the tuned pipe or a diverging portion of the tuned pipe; the method comprising:
sensing, with an exhaust gas temperature sensor, a temperature of exhaust gases exiting the catalytic converter in the one of the converging portion of the tuned pipe or the diverging portion of the tuned pipe;
comparing, by an engine control unit (ECU) of the ICE, the sensed temperature of the exhaust gas to an operating temperature range of the catalytic converter;
in response to the sensed temperature of the exhaust gas being outside the operating temperature range of the catalytic converter, controlling by the ECU of the ICE to bring the temperature of the exhaust gases within the operating temperature range of the catalytic converter;
in response to the sensed temperature of the exhaust gas being above a maximum operating temperature of the catalytic converter, the ECU controlling the ICE to decrease the temperature of the exhaust gases; and
in response to the sensed temperature of the exhaust gas being below a minimum operating temperature of the catalytic converter, the ECU controlling the ICE to increase the temperature of the exhaust gases.