Bombardier Recreational Products Inc.

Marc Giguere

Michel Bernier

Bruno Schuehmacher

Xavier-Pierre Aitcin

Luc Champigny

Sebastien Thibault

Vincent Gamache

Claude Fortin

A two-stroke engine assembly has a two-stroke internal combustion engine (ICE) and an exhaust system fluidly connected to the ICE. The exhaust system has a tuned pipe and at least one catalytic converter. A bypass valve is provided to selectively bypass the at least one catalytic converter. A method for controlling a two-stroke engine assembly controls the ICE to bring the temperature of exhaust gases within an operating temperature range of the catalytic converter. Another method for controlling a two-stroke engine assembly uses a lambda sensor to control the air-fuel ratio in cylinders of the ICE.

Two-stroke engine assembly having a catalytic converter and method for controlling same

Monitoring is provided for a drive belt of a continuously variable transmission (CVT) mounted in a vehicle having a motor driving the CVT. A rotational speed of the motor and a power level of the motor are sensed. An abuse indicator for the drive belt is set when, concurrently, the rotational speed of the motor increases at a rate that exceeds a change threshold and the power level of the motor exceeds a power threshold. A level of abuse of the drive belt is calculated based on a speed of the vehicle and on a drive belt temperature. Damage to the drive belt may be prevented by limiting a power output of the motor when an accumulated level of abuse exceeds an abuse threshold. A vehicle having an electronic control unit configured to perform the method is also disclosed.

Method for monitoring a drive belt of a continuously variable transmission and method for preventing damage to the drive belt

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Magog, Canada

Marc Giguere