§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4098078A Expired / Lapsed US ⏱️ 0.0 years remaining

Process and apparatus for afterburning of combustible pollutants from an internal combustion engine

Assignee: Individual
•
Filing: 1977-01-11
•
Granted: 1978-07-04
•
Expires: 1997-01-11
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract In a process for the afterburning of the combustible pollutants from an internal combustion engine, in order to automatically reduce the secondary induction rate when power increases without using a controlling valve actuated by the carburettor venturi depression, there is provided a volumetric efficiency of the secondary air pump linked to and activated by the engine and a volumetric efficiency which decreases when the ratio between its back pressure and suction pressure increases, this reduction being achieved through the proper selection of the pump volumetric comression ratio r: between 0.6 c and 1.3 c when a steeply decreasing trend is required, and above 1.3 c if a slower and slower decreasing trend is required. To perform this process an afterburner apparatus has a nitrogen oxide reducing catalyst placed inside the afterburner reactor on the gas stream immediately at the outlet of a torus, in which the gases are homogenized and their reaction with preinjection air is terminated.

Inventors

  • 👤 Pierre Alfred Laurent

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 02:14
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/22; F01N3/227; F01N3/24; F01N3/26; F01N3/30; F01N3/34; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 150 words
A process for the afterburning of the combustible pollutants from an internal combustion engine wherein secondary air is introduced into the engine exhaust gases, the secondary air being introduced in an amount in relation to primary combustion air drawn into the engine inlet to form a secondary air injection ratio, the improvement comprising, reducing the secondary air ratio when the engine power increases, independently of the engine carburettor venturi suction, by pumping secondary air into the engine with a volumetric efficiency which decreases when, as a consequence of increase of engine power and exhaust gas flow, the ratio c of the pressure of pumped air to the inlet air pressure also increases, said volumetric efficiency decrease being obtained by maintaining a volumetric compression ratio of the pumped air between 1 and 1.5 times the ratio c for a pumping operation when the engine is running at maximum speed and load.
Claim 2
Dependent Claim 150 words
A process for the afterburning of the combustible pollutants from an internal combustion engine wherein secondary air is introduced into the engine exhaust gases, the secondary air being introduced in an amount in relation to primary combustion air drawn into the engine inlet to form a secondary air injection ratio, the improvement comprising, reducing the secondary air ratio when the engine power increases, independently of the engine carburettor venturi suction, by pumping secondary air into the engine with a volumetric efficiency which decreases when, as a consequence of increase of engine power and exhaust gas flow, the ratio c of the pressure of pumped air to the inlet air pressure also increases, said volumetric efficiency decrease being obtained by maintaining a volumetric compression ratio of the pumped air between 1 and 1.5 times the ratio c for a pumping operation when the engine is running at maximum speed and load.
Claim 3
Dependent Claim 97 words
A process according to claim 1, comprising maintaining the secondary air ratio in a given range when the engine is operated at high speed, by restricting the inlet of pumped air by means of a throttling valve, actuated by a suction pressure controller, which keeps the absolute pressure of the inlet pumped air between 1.2 and 1.5 times the absolute pressure in the engine intake manifold, the throttling valve being kept open when the transmission is in neutral, when the engine speed is lower than 1500 rpm, and when the engine is operated with the choke activated.
Claim 4
Dependent Claim 38 words
A process according to claim 1, comprising increasing the secondary air injection ratio during start-up on choke and during acceleration by directing air from a cooling blower to the air to be pumped thereby increasing air inlet pressure.

References Cited (Backward Citations)

US3106820A Cited
US3203168A Cited
US3812673A Cited
US3826089A Cited
US3785152A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-07-03 1982-01-02 1982-07-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-07-03 1986-01-02 1986-07-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-07-03 1990-01-02 1990-07-04 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag