IPC 7 English version F01N !A-F01N 11/00

F01N-F01N01100

SECTION F – MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F 01

MACHINES OR ENGINES IN GENERAL (combustion engines F02; machines for liquids F03, F04); ENGINE PLANTS IN GENERAL; STEAM ENGINES

F 01 N

GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K 13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M 35/00; protecting against, or damping, noise in general G10K 11/16)

Note

Attention is drawn to the Notes preceding class F01, especially as regards Note (3).

Silencing apparatus characterised by method of silencing

by using resonance

having sound-absorbing materials in resonance chambers

by using interference effect

by reducing exhaust energy by throttling or whirling

in combination with sound-absorbing materials

using spirally- or helically-shaped channels (F01N 1/10 takes precedence; cyclones B04C)

by adding air to exhaust gases

by using movable parts

having rotary movement

having oscillating or vibrating movement (the parts being resilient walls F01N 1/22)

the parts being resilient walls

by using sound-absorbing materials (F01N 1/04, F01N 1/06, F01N 1/10, F01N 1/14, F01N 1/16 take precedence)

Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust (electric control F01N 9/00; monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N 11/00) [4]

by means of electric or electrostatic separators [7]

for cooling, or for removing solid constituents of, exhaust (by means of electric or electrostatic separators F01N 3/01) [1,7]

021

by means of filters [7]

022

characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous [7]

023

using means for regenerating the filters, e.g. by burning trapped particles [7]

025

using fuel burner or by adding fuel to exhaust [7]

027

using electric or magnetic heating [7]

028

using microwaves [7]

029

by adding non-fuel substances to exhaust [7]

031

having means for by-passing filters, e.g. when clogged or during cold engine start [7]

032

during filter regeneration only [7]

033

in combination with other devices [7]

035

with catalytic reactors [7]

037

by means of inertial or centrifugal separators, e.g. associated with agglomerators [7]

038

by means of perforated plates defining expansion chambers associated with condensation and collection chambers [7]

by means of liquids

by means of air, e.g. by mixing exhaust with air (silencers working by addition of air to exhaust F01N 1/14; arrangements for the supply of additional air for the thermal or catalytic conversion of noxious components of exhaust F01N 3/30) [7]

for extinguishing sparks

for rendering innocuous (using electric or electrostatic separators F01N 3/01; chemical aspects B01D 53/92) [1,7]

by thermal or catalytic conversion of noxious components of exhaust [3]

characterised by methods of operation; Regulation [3]

specially adapted for catalytic conversion (F01N 3/22 takes precedence) [3]

Regulation of additional air supply only, e.g. using by-passes or variable air pump drives [3]

characterised by constructional aspects of converting apparatus (filtering in combination with catalytic reactors F01N 3/035) [3,7]

Construction of thermal reactors [3]

Construction of catalytic reactors [3]

Arrangements for supply of additional air (regulation, e.g. using by-passes or variable air pump drives, F01N 3/22) [3]

using air pumps (using jet air pumps F01N 3/34; pumps in general F04) [3]

using air conduits or jet air pumps, e.g. near the engine exhaust port [3]

Arrangements for supply of additional fuel [3]

Arrangements for igniting [3]

Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy (using kinetic or wave energy of exhaust gases in exhaust systems for charging F02B; predominant aspects of such devices, see the relevant classes for the devices)

the devices using heat

the devices using kinetic energy

Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N 1/00 to F01N 5/00, F01N 9/00, F01N 11/00

Apparatus having two or more separate silencers in series

Apparatus having two or more silencers in parallel, e.g. having interconnections for multi-cylinder engines

specially adapted for star-arrangement of cylinders, e.g. exhaust manifolds

Other arrangements or adaptations of exhaust conduits (pipes in general F16L)

of exhaust manifolds

specially adapted for submerged exhausting

having thermal insulation

Selection of particular materials

Construction facilitating manufacture, assembly, or disassembly

Flared outlets, e.g. of fish-tail shape

Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N 11/00; conjoint electrical control of two or more combustion engine functions F02D 43/00) [4]

11/

Monitoring or diagnostic devices for exhaust-gas treatment apparatus [7]