Internal combustion engine

Details Internal combustion engine Internal combustion engine

1978-03-08

1984-05-22

Lazarus, Ira S.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

Air or combustible mixture entering the combustion chamber...

261 23A, 123579, A02B 1500, F02B 1300

Patent

active

044495056

ABSTRACT:
Several embodiments of internal combustion engines offering improved performance in the form of improved fuel economy and reduction in the emission of unwanted exhaust gas constituents at idle and low speed operation. In each embodiment, an induction system is employed using a main intake passage and a sub-intake passage, each of which communicates with the combustion chamber through a respective port. The sub-intake passage has a substantially smaller cross-sectional area than the main intake passage so that a given mass flow through this passage will enter the combustion chamber at a higher velocity than that flowing through the main intake passage. Throttle valve means are provided for sequentially controlling the flow into the combustion chamber through the main and sub-intake passages. This throttle valve means causes substantially all of the intake air flow at idle to pass through the sub-intake passage to promote high velocity induction and, at least in some embodiments, controlled swirl to the intake gases. This has been found to greatly improve combustion at idle and low speeds. In some embodiments of the invention, separate charge forming devices are employed for each of the induction passages, in the form of main and sub-carburetors. In other embodiments of the invention, the charge is supplied by a fuel injection nozzle that discharges into the main induction passage. In certain embodiments the sub-intake passage is oriented so as to generate a swirl in the combustion chamber which is maintained during the compression stroke. This swirl is obtained by directing the sub-intake passage port at the intake valve in such a way that the intake valve deflects the flow of the intake gases in a swirling motion. As a further feature, in certain embodiments other gases generated by the operation of the vehicle, such as evaporative fuel gases, crank case discharge products or a portion of the exhaust gases are introduced into the combustion chamber through the sub-intake passage.

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