Gm Global Technolgoy Operations, Inc.

Alan Root Lockwood

Wajdi B Hamama

Robert J Genslak

James A Goodall

Sidney C Kolongowski

Mather El-Jaroudi

Dilyard Doolin

A system for a vehicle includes a steady-state (SS) temperature module and a mass temperature module. The SS temperature module generates a SS temperature of a downstream-most catalyst of an exhaust system at a predetermined location between upstream and downstream faces of the downstream-most catalyst. The predetermined location is a predetermined distance upstream from the downstream face. The mass temperature module generates an instantaneous temperature of the downstream-most catalyst at the predetermined location as a function of the SS temperature.

Temperature estimation systems and methods

A noise reducer for an engine induction system comprises an outer duct having an inlet and outlet, and an inner duct having an inlet and outlet. The inner duct has a contained portion including the inner duct outlet and a portion of the inner duct adjacent to the inner duct outlet. The contained portion is contained in the outer duct with the inner duct outlet being adjacent the outer duct outlet. The noise reducer further comprises a closure extending away from the inner duct into engagement with the outer duct. The closure is spaced apart from the inner duct outlet along the axis of the inner duct. A resonance chamber is defined by the space between the contained portion, closure and outer duct. A chamber port is defined by the space between the inner duct outlet and the outer duct. The outer duct outlet is connectable to an upstream end of the induction system so that air flows through the inner duct prior to entering the induction system and the resonance chamber communicates with the induction system enabling sound waves from the induction system to enter and exit the resonance chamber through the chamber port. The resonance chamber has a cross section and length sized so that sound waves exiting said resonance chamber destructively interfere with sound waves in the induction system to reduce noise produced by the induction system.

Engine noise reducer

Growing community of inventors

East Lansing, MI, United States of America

Alan Root Lockwood