Exhaust system with HC adsorber and parallel exhaust-gas catalytic converter, and vehicle having an exhaust system of said type
First Claim
1. An exhaust system for an internal combustion engine comprising:
- an exhaust gas path comprising two parallel exhaust ducts, namely a main duct and a secondary duct, at least in some of its sections,a setting means configured to selectively conduct an exhaust gas flow into the main duct or the secondary duct,a HC adsorber provided in the secondary duct for reversible adsorption of unburned hydrocarbons (HC),a bypass catalytic converter provided in the main duct for converting at least one exhaust gas component,a main catalytic converter located in a common exhaust duct downstream of the two parallel exhaust ducts, anda junction section of the secondary duct comprising at least one inlet opening configured to increase the exhaust gas back pressure in the secondary duct causing at least a major portion of the exhaust gas flow to flow through the main duct when the setting means is in an open position in which both the main duct and the secondary duct are open, andwherein the bypass catalytic converter and the main catalytic converter are adapted to force the exhaust gas flow to flow in an upstream to downstream direction in both the main duct and secondary duct when the setting means is in the open position.
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Accused Products
Abstract
The invention relates to an exhaust system (10) for an internal combustion engine, having an exhaust gas path which, at least in sections, has two parallel exhaust ducts (30, 32), specifically a main duct (30) and a secondary duct (32), wherein a HC adsorber (42) for the reversible adsorption of unburned hydrocarbons (HC) is provided in the secondary duct (32); having a setting means (46) for selectively conducting an exhaust gas flow into the main duct (30) and/or into the secondary duct (32), and having a main catalytic converter (40) arranged downstream of the parallel exhaust ducts (30, 32). It is intended that a catalytic exhaust gas converter (44) for converting at least one exhaust gas component is provided in the main duct (30) of the parallel exhaust ducts (30, 32).
18 Citations
16 Claims
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1. An exhaust system for an internal combustion engine comprising:
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an exhaust gas path comprising two parallel exhaust ducts, namely a main duct and a secondary duct, at least in some of its sections, a setting means configured to selectively conduct an exhaust gas flow into the main duct or the secondary duct, a HC adsorber provided in the secondary duct for reversible adsorption of unburned hydrocarbons (HC), a bypass catalytic converter provided in the main duct for converting at least one exhaust gas component, a main catalytic converter located in a common exhaust duct downstream of the two parallel exhaust ducts, and a junction section of the secondary duct comprising at least one inlet opening configured to increase the exhaust gas back pressure in the secondary duct causing at least a major portion of the exhaust gas flow to flow through the main duct when the setting means is in an open position in which both the main duct and the secondary duct are open, and wherein the bypass catalytic converter and the main catalytic converter are adapted to force the exhaust gas flow to flow in an upstream to downstream direction in both the main duct and secondary duct when the setting means is in the open position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification