Supercharged internal combustion engine with exhaust particulates filter
AssigneeBBC Brown, Boveri & Company, Limited
InventorAndreas Mayer
Life of this patent
Estimating the term…
Abstract
In order to limnit the exhaust particulate emission when supercharging a pressure wave machine-supercharged internal combustion engine, an exhaust particulates filter is arranged in the high-pressure part of the exhaust gas system ahead of the pressure wave machine. By increasing the supply of fuel to the engine itself and/or briefly closing a charge air flap valve a recirculation flap valve and/or brief opening of a exhaust gas by-pass valve, the exhaust gas attains the combustion temperature of soot components deposited on the surface of the filter. These soot components are burned off, and the filter is automatically regenerated.
Claims18
A device for limiting exhaust particulate emission when supercharging internal combustion engines, comprising:
- a pressure wave machine;
- an air suction line means for delivering air to said pressure wave machine;
- a charge air line means for delivering charged air from said pressure wave machine to said internal combustion engine;
- a plurality of exhaust gas conduits leading from a cylinder head of an internal combustion engine to an exhaust gas system, said exhaust gas system including a high pressure portion communicating said cylinder head with said pressure wave machine and a low pressure portion downstream of said pressure wave machine, the high pressure portion including an exhaust gas receiver;
- a briefly closable recirculation valve in said air suction line;
- and
- an exhaust particulate filter arranged in the high pressure portion of said exhaust gas system upstream of the pressure wave machine whereby the brief closing of the recirculation valve in said air suction line briefly raises the temperature of the exhaust gas entering said filter so as to ignite and burn particulates collected at said particulate filter.
A method for limiting exhaust particulates emission from an internal combustion engine comprising the steps of:
- mechanically driving a pressure wave machine from said internal combustion engine;
- inducting air into said pressure wave machine through an air suction line having a recirculation valve therein;
- discharging the air from said pressure wave machine in a pressurized state;
- conveying the pressurized air from said pressure wave machine to an intake manifold of said internal combustion engine through a charge air line;
- conveying exhaust products from said internal combustion engine to an exhaust housing of said pressure wave machine through a high pressure exhaust line;
- removing exhaust products from said pressure wave machine through a low pressure exhaust line;
- collecting particulates from the engine exhaust in a filter in said high pressure exhaust line upstream of the pressure wave machine;
- and
- briefly reducing the amount of said pressurized air conveyed to said intake manifold by briefly closing said recirculation valve to briefly raise the temperature of the exhaust gas entering said filter to thereby ignite and burn at least a portion of collected particulates.
Dependencies are inferred from the claim text.