Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1983-03-04
1985-12-17
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Fuel injection system
123417, 123424, 123335, 123643, 36443104, 36443110, F02P 515
Patent
active
045586730
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention pertains to an internal combustion engine ignition control system. More particularly, the present invention pertains to an electronic ignition control system for generating a spark to ignite the fuel within a cylinder of an internal combustion engine at the optimum time to assure maximum fuel efficiency and engine performance.
The operating performances of an internal combustion engine is dependent, at least in part, on the point during the cycle of operation of each cylinder at which the fuel is ignited. The time of ignition affects the fuel efficiency, the amount of power generated by the engine, and the smoothness of engine operation. Mechanical means for controlling the ignition time are available, but generally these are cumbersome devices of questionable accuracy, often involving weights and springs to control the operating time of various components, and such mechanical components are inherently inaccurate and subject to operating fluctuations.
SUMMARY OF THE INVENTION
The present invention is an electronic ignition timing control device for controlling the initiation of a spark within a cylinder of an internal combustion engine so that the spark occurs at the optimum time for ignition of the fuel within that cylinder, to achieve optimum engine performance. In accordance with the present invention, the engine performance during each timing interval of the engine is used to determined the ignition timing during a subsequent timing interval. Generally, the burning time for a given fuel/air mixture at a particular compression ratio is relatively independent of the engine speed. Accordingly, in accordance with a first embodiment of the present invention, at the same point during each revolution of the engine, an electrical pulse is generated by a magnetic pickup in cooperation with a rotating component within the engine such as the crank shaft, and this pickup pulse is used to initiate operation of a counter which then counts clock pulses of a fixed frequency until the next pickup pulse, when the rotating component next passes the same point. A number, representing the number of clock pulses counted between consecutive pickup pulses, is then preset into a second counter which is then counted down by a second set of clock pulses occurring at a higher rate than the first clock pulses. When this down counter reaches a preselected count, an output pulse is generated to cause an electrical pulse to be applied to a selected sparkplug to initiate combustion within the associated cylinder. The interval between pickup pulses is inversely related to the engine speed. By controlling the value of the preselected count of the second counter, the time available for burning of the air/fuel mixture before the piston reaches its initial mechanical timing (normally before the top dead center position) is maintained at the optimum value for the desired engine performance.
In another embodiment of the present invention a predetermined count level is present into a down counter which is then counted down at a rate which during normal engine running operation results in generation of the output pulses at the desired time. The down count level at the time of receipt of the pickup pulse is divided in half, and the resulting number is subtracted from the present count level. This new count level is then preset into the down counter for a subsequent timing interval.
In each embodiment, then, the engine speed during each timing interval of the engine is utilized in determining the spark initiation times during a subsequent timining interval.
Preferably, the down counter operation is utilized to provide a spark-initiating pulse for each of the cylinders of the engine. Thus, for example, in an eight cylinder engine, the count pulses for the down counter are at a rate which produces four output pulses during each engine revolution. As a consequence, during two revolutions of the engine, eight spark-initiating pulses are generated, one for each cylinder.
While suitable for use wit
REFERENCES:
patent: 3906207 (1975-09-01), Rivere et al.
patent: 4099495 (1978-07-01), Kiencke et al.
patent: 4119069 (1978-10-01), Perrin
patent: 4177516 (1979-12-01), Mason
patent: 4207846 (1980-06-01), Borst et al.
patent: 4262643 (1981-04-01), Cavil et al.
patent: 4265211 (1981-05-01), Meloeny
patent: 4267810 (1981-05-01), Wesemeyer et al.
patent: 4355360 (1982-10-01), Asano et al.
patent: 4359987 (1982-11-01), Wesemeyer et al.
Radio Shack New 1975-1976 unabridged Dictionary of Electronics, edited by Rudolf F. Graf--1975.
Dolinar Andrew M.
Nutek, Incorporated
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