US3786791A — Exhaust control method and apparatus

Claim 1

Independent Claim 224 words

An exhaust control apparatus, communicating with the exhaust port of a cylinder of an internal combustion engine burning a gas-air fuel mixture, including: a. a casing having a chamber formed therein communicating with the exhaust port of an internal combustion engine through an inlet opening for receiving therein the exhaust gases from the exhaust port of the engine which are vented to the atmosphere through an outlet opening formed through said casing; b. means positioned in said chamber for substantially separating the flow of high frequency pressure waves from the remainder of the exhaust gas pressure wave flow; c. means positioned in said chamber for attenuating the sound of the high frequency pressure wave flow; d. a conduit having a flow passage therethrough positioned in said chamber for flowing through said flow passage the remainder of the exhaust gas pressure wave flow and having a shape for tuning the flow therethrough to produce a standing wave; e. said conduit provides a surface for reflecting a portion of the remainder of the exhaust gas pressure wave flow to effect partial internal pressure wave cancellation; and f. said conduit is positioned for enabling the reflected portion of the exhaust gas pressure wave to return to the exhaust port for containing the fresh gas-air fuel mixture within the cylinder wherein the flow of exhaust gas is controlled.

Claim 2

Dependent Claim 224 words

An exhaust control apparatus, communicating with the exhaust port of a cylinder of an internal combustion engine burning a gas-air fuel mixture, including: a. a casing having a chamber formed therein communicating with the exhaust port of an internal combustion engine through an inlet opening for receiving therein the exhaust gases from the exhaust port of the engine which are vented to the atmosphere through an outlet opening formed through said casing; b. means positioned in said chamber for substantially separating the flow of high frequency pressure waves from the remainder of the exhaust gas pressure wave flow; c. means positioned in said chamber for attenuating the sound of the high frequency pressure wave flow; d. a conduit having a flow passage therethrough positioned in said chamber for flowing through said flow passage the remainder of the exhaust gas pressure wave flow and having a shape for tuning the flow therethrough to produce a standing wave; e. said conduit provides a surface for reflecting a portion of the remainder of the exhaust gas pressure wave flow to effect partial internal pressure wave cancellation; and f. said conduit is positioned for enabling the reflected portion of the exhaust gas pressure wave to return to the exhaust port for containing the fresh gas-air fuel mixture within the cylinder wherein the flow of exhaust gas is controlled.

Claim 3

Dependent Claim 45 words

The invention as set forth in claim 1, wherein: said chamber having a shape to tune the flow of high frequency pressure waves to a standIng wave for effecting mutual pressure wave cancellation when combined with the remainder of the exhaust gas pressure wave flow.

Claim 4

Dependent Claim 42 words

The invention as set forth in claim 1, wherein: said chamber is formed by said casing to tune the flow of high frequency pressure waves to effect mutual sound cancellation when combined with the remainder of the exhaust gas pressure wave flow.

Claim 5

Independent Claim 109 words

A method of controlling the flow of exhaust gases from the exhaust port of a cylinder of an internal combustion engine, including: a. separating the flow of high frequency pressure waves from the remainder of the exhaust gas pressure wave flow; b. attenuating the sound of the high frequency pressure wave flow wherein the flow of the exhaust gas is controlled; c. reflecting a portion of the remainder of the exhaust gas pressure wave flow to effect some internal cancellation thereof; and d. timing the reflected portion of the exhaust gas pressure wave to return to the exhaust port for containing the fresh gas-air fuel mixture within the cylinder.

Claim 6

Independent Claim 109 words

A method of controlling the flow of exhaust gases from the exhaust port of a cylinder of an internal combustion engine, including: a. separating the flow of high frequency pressure waves from the remainder of the exhaust gas pressure wave flow; b. attenuating the sound of the high frequency pressure wave flow wherein the flow of the exhaust gas is controlled; c. reflecting a portion of the remainder of the exhaust gas pressure wave flow to effect some internal cancellation thereof; and d. timing the reflected portion of the exhaust gas pressure wave to return to the exhaust port for containing the fresh gas-air fuel mixture within the cylinder.

Claim 7

Dependent Claim 45 words

The apparatus as set forth in claim 1, including: said chamber having a shape to tune the flow of high frequency pressure waves to a standing wave for effecting mutual pressure wave cancellation when combined with the remainder of the exhaust gas pressure wave flow.

Claim 8

Dependent Claim 74 words

The apparatus as set forth in claim 1, including: said chamber having a progressively increasing flow area for expanding the exhaust gas flow to a lower pressure with said conduit positioned in said chamber to receive the flow of lower frequency pressure waves in said flow passage for flowing therethrough and with the expanded flow of high frequency pressure waves directed into an annular area of said chamber between said casing and said conduit.

Claim 9

Dependent Claim 61 words

The apparatus as set forth in claim 6, wherein said means for attenuating the sound of the high frequency pressure wave flow including: a packing of sound absorbing material positioned in the annular area between said casing and said conduit and in which the high frequency pressure wave flow is brought into contact wherein the sound of the flow is attenuated.

Claim 10

Dependent Claim 51 words

The method as set forth in claim 4, including the steps of: a. timing the high frequency pressure wave flow to produce a standing wave; and b. combining the tuned high frequency pressure wave flow with the remainder of the exhaust gas flow to cancel the sound of the exhaust flow.

Claim 11

Dependent Claim 36 words

The method as set forth in claim 8, including the step of: tuning the remainder of the exhaust gas flow prior to combining with the tuned high frequency pressure wave flow to produce a standing wave.

Claim 12

Dependent Claim 55 words

The method as set forth in claim 9, including the step of: tuning the high frequency pressure wave flow to a standing wave having a frequency of three times the frequency of the standing wave of the remainder of the exhaust gas flow for effecting cancellation of the sound waves when the flows are combined.

Claim 13

Dependent Claim 30 words

The method as set forth in claim 4, including the step of: expanding the exhaust gas flow in separating the high frequency pressure waves for reducing the exhaust gas pressure.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-01-21	1977-07-23	1978-01-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-01-21	1981-07-23	1982-01-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-01-21	1985-07-23	1986-01-22	$7700.00	Window Closed / Lapsed

Exhaust control method and apparatus

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