International Engine Intellectual Property Company, LLC

Bashar Y Melhem

Luis Carlos Cattani

Martin R Zielke

Paul Gottemoller

John R Zagone

Robert Lawrence Rowells

Peter Popadiuc

Michael D Bartkowicz

In response to activation of a compression release brake when a motor vehicle having a turbocharged internal combustion engine is operating at some elevation above sea level and a turbocharger compressor is operating in a region of an operating map which is creating boost air in an engine intake manifold which would cause the compression release brake to decelerate the vehicle more slowly at that elevation than it would at sea level for the same operating conditions of the vehicle and engine other than altitude, the compression release brake decelerates the vehicle less slowly by causing an exhaust gas recirculation system to reduce at least one of a) mass of exhaust diverted to an intake system of the engine and b) cooling of the diverted exhaust.

Turbocharger operation to increase brake effectiveness

A circuit for cooling exhaust gas being recirculated through an EGR system () of an engine () from an exhaust system () successively through first and second heat exchangers () to an intake system () for entrainment with intake air. Each heat exchanger has a respective coolant inlet through which liquid coolant enters and a respective coolant outlet through which liquid coolant exits after having absorbed heat from recirculated exhaust gas. The circuit has a third heat exchanger () to which coolant coming from the outlet of one of the first and second heat exchangers rejects heat, and parallel branches () through which coolant enters the inlet of the other of the first and second heat exchangers. One of the parallel branches has a fourth heat exchanger () to which coolant flowing through that branch rejects heat, and one or more devices (A) for controlling the quantity of coolant flowing through each branch.

FLEX dual stage EGR cooling

A system for driving an EGR stream for an engine includes an exhaust gas turbine, a main compressor and a supplemental EGR compressor. The turbine drives the main compressor to pressurize intake air and drives the supplemental EGR compressor to pressurize an EGR exhaust gas stream to be introduced into the intake air system. A supplemental EGR compressor takes suction of exhaust gas downstream from the turbine. A three-way valve proportions exhaust gas between the engine exhaust gas discharge conduit and the suction of the supplemental EGR compressor. The turbine drives a shaft and the main compressor and the supplemental EGR compressor are driven by having corresponding compressor wheels fixed onto the common shaft.

System using supplemental compressor for EGR

A first loop contains engine coolant passageways () and a first radiator (). A second loop contains a first EGR cooler (). A third loop contains a second EGR cooler (), a second radiator (), a charge air cooler (LP), a first valve (), and a second valve (). Valve () apportions coolant flow entering an inlet (A) to parallel flow paths, one including second radiator () and the other being a bypass around radiator (). The apportioned flows merge into confluent flow to both an inlet of charge air cooler (LP) and a first inlet (B) of valve (). Valve () has an outlet (C) communicated to an inlet of second EGR cooler (). The first condition of valve () closes a second inlet (A) to coolant flowing toward both the second inlet (A) and inlet (A) while opening inlet (B) to outlet (C). The second condition of valve () opens second inlet (A) to coolant flowing toward second inlet (A) and inlet (A) of the valve () while closing first inlet (B) of valve () to outlet (C) of valve ().

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Orland Park, IL, United States of America

Bashar Y Melhem