US3929115A — Means for cleaning exhaust gas in a reciprocating…

Claim 1

Independent Claim 232 words

Means for reducing noxious constituents in exhaust gas of a reciprocating piston type engine comprising fuel supply means for supplying relatively lean fuel air mixture having an air fuel ratio of 18 to 23, fuel atomizing means including heating means for sufficiently atomizing the fuel in the mixture supplied from said fuel supply means to a combustion chamber of the engine continuously in response to temperature changes in the fuel atomizing means, a primary and an auxiliary ignition plug disposed in each engine combustion chamber, and an ignition timing control mechanism varied in response to temperature changes in the fuel atomizing means for determining the ignition timing of the auxiliary ignition plug idependently from that of the primary ignition plug, wherein said ignition timing control mechanism includes an advance mechanism which is operated in response to the engine speed, such that both of the ignition plugs are energized simultaneously under a relatively low engine speed while the ignition timing of the primary ignition plug is advanced under medium and high speed engine operation at a greater rate than that of the auxiliary ignition plug so that the difference between the timings of the ignition plugs is increased in response to the increase in the engine speed and wherein said ignition timing control mechanism is provided with an acceleration compensating mechanism for advancing the timing of the auxiliary ignition plug during engine deceleration.

Claim 2

Dependent Claim 232 words

Means for reducing noxious constituents in exhaust gas of a reciprocating piston type engine comprising fuel supply means for supplying relatively lean fuel air mixture having an air fuel ratio of 18 to 23, fuel atomizing means including heating means for sufficiently atomizing the fuel in the mixture supplied from said fuel supply means to a combustion chamber of the engine continuously in response to temperature changes in the fuel atomizing means, a primary and an auxiliary ignition plug disposed in each engine combustion chamber, and an ignition timing control mechanism varied in response to temperature changes in the fuel atomizing means for determining the ignition timing of the auxiliary ignition plug idependently from that of the primary ignition plug, wherein said ignition timing control mechanism includes an advance mechanism which is operated in response to the engine speed, such that both of the ignition plugs are energized simultaneously under a relatively low engine speed while the ignition timing of the primary ignition plug is advanced under medium and high speed engine operation at a greater rate than that of the auxiliary ignition plug so that the difference between the timings of the ignition plugs is increased in response to the increase in the engine speed and wherein said ignition timing control mechanism is provided with an acceleration compensating mechanism for advancing the timing of the auxiliary ignition plug during engine deceleration.

Claim 3

Dependent Claim 67 words

Means in accordance with claim 1, in which said fuel atomizing means includes heat sensitive means and said ignition timing control mechanism has a heat sensitive ignition timing advance means, said heat sensitive means being operatively connected with said heat sensitive ignition timing advance means so that the timings of the plugs are advanced at greater extents as the temperature in the fuel atomizing means is increased.

Claim 4

Dependent Claim 77 words

Means in accordance with claim 2, in which said fuel atomizing means comprising a heating pipe provided in the path of the mixture, a control valve provided in the exhaust pipe or in the heating pipe for directing a portion of engine cooling water or exhaust gas so as to supply a sufficient amount of heat for atomizing the fuel in the mixture, said valve being actuated in accordance with the temperature in the fuel atomizing means.

Claim 5

Dependent Claim 27 words

Means in accordance with claim 2, in which the overlap of the opening timings of the intake and the exhaust valves is reduced to 0* to -5*.

Claim 6

Dependent Claim 203 words

Apparatus for cleaning the exhaust gas containing NOx compounds of reciprocating piston type internal combustion engines having at least one combustion chamber, said apparatus comprising: fuel supply means for providing a lean fuel-air mixture having an air-fuel ratio in the range of about 18 to 23, atomizing means downstream of said fuel supply means for atomizing the lean fuel-air mixture and for supplying the lean mixture to said at least one combustion chamber, at least a first and a second variable timing ignition means, said ignition means being provided for said at least one combustion chamber, automatic means for varying the ignition timing of each of said ignition means independently of the other ignition means such that the ignition timings are differentiated so as to substantially reduce the NOx compounds present in the exhaust gas, and wherein the atomizing means includes lean mixture heating means and heat sensitive means, whereby an ignition timing control means having a heat sensitive ignition time advance is provided and the heat sensitive means, the heat sensitive ignition timing advance means, and the ignition means are operatively connected such that the timings of the ignition means are varied in response to temperature changes in the fuel atomizing means.

Claim 7

Dependent Claim 203 words

Apparatus for cleaning the exhaust gas containing NOx compounds of reciprocating piston type internal combustion engines having at least one combustion chamber, said apparatus comprising: fuel supply means for providing a lean fuel-air mixture having an air-fuel ratio in the range of about 18 to 23, atomizing means downstream of said fuel supply means for atomizing the lean fuel-air mixture and for supplying the lean mixture to said at least one combustion chamber, at least a first and a second variable timing ignition means, said ignition means being provided for said at least one combustion chamber, automatic means for varying the ignition timing of each of said ignition means independently of the other ignition means such that the ignition timings are differentiated so as to substantially reduce the NOx compounds present in the exhaust gas, and wherein the atomizing means includes lean mixture heating means and heat sensitive means, whereby an ignition timing control means having a heat sensitive ignition time advance is provided and the heat sensitive means, the heat sensitive ignition timing advance means, and the ignition means are operatively connected such that the timings of the ignition means are varied in response to temperature changes in the fuel atomizing means.

Claim 8

Dependent Claim 22 words

The apparatus of claim 5, wherein means for advancing the ignition timing of the second ignition means during engine acceleration is provided.

Claim 9

Dependent Claim 32 words

The apparatus of claim 5, wherein said automatic means retards the ignition timing of a first one of said ignition means with respect to the ignition timing of the other ignition means.

Claim 10

Dependent Claim 92 words

The apparatus of claim 5, wherein said automatic means includes an advance mechanism which is operated in response to engine speed such that both of the ignition means are energized simultaneously under a relatively low engine speed while the ignition timing of a first one of said ignition means is advanced under medium and high speed engine operations at a greater rate than the ignition timing of the other ignition means so that the difference between the timings of the ignition means is increased in response to an increase in engine speed.

Claim 11

Dependent Claim 32 words

The apparatus of claim 5, wherein the automatic means includes means which increases the difference between the ignition timings of the respective ignition means in response to an increase in engine speed.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-12-29	1979-06-30	1979-12-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-12-29	1983-06-30	1983-12-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-12-29	1987-06-30	1987-12-30	$7700.00	Window Closed / Lapsed

Means for cleaning exhaust gas in a reciprocating piston type automobile engine

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