Internal-combustion engines – Combustion chamber means having fuel injection only – Air entering combustion chamber through plural inlets
Patent
1993-09-03
1997-02-04
Okonsky, David A.
Internal-combustion engines
Combustion chamber means having fuel injection only
Air entering combustion chamber through plural inlets
123432, F02B 7502
Patent
active
055988199
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention concerns additional piston engine cycles or strokes.
BACKGROUND ART
In piston engines, particularly 4 stroke petrol engines, their efficiency is reduced when the engine load is reduced. At the end of the exhaust stroke a residue of exhaust gas is left in the cylinder. This exhaust residue is hot and causes the temperature of the incoming fuel/air mixture to be increased. A high temperature of the mixed gases at the start of the compression stroke reduces the fuel efficiency of the engine. Conversely, a reduction in the temperature of the gases at the start of compression would increase the efficiency.
The efficiency of a piston engine is also increased when the speed of combustion is increased.
Also the efficiency of a piston engine is increased when the temperature rise during combustion is increased.
Furthermore the efficiency of a piston engine is increased when the combustion pressure or the effective compression ratio is increased.
This invention aims to increase fuel efficiency in all the above respects which may lead to reduced exhaust emissions.
DISCLOSURE OF INVENTION
There is a piston engine where additional, air only, induction strokes are introduced, when the load demanded of the engine is less than full load, causing the remaining power strokes to be more fuel efficient.
When the load is reduced to less than 50%, a 4 stroke engine can change to an 8 stroke cycle. This may be achieved by preventing the induction of fuel on alternate induction strokes.
Thus after a normal cycle of induction, compression, power and exhaust the next stroke is an induction stroke of air only with no fuel. The following power stroke produces no power because there was no fuel to ignite. On the next induction stroke a larger quantity of air and fuel is induced, giving twice the power of a conventional power stroke on a normal 4 stroke engine, as it runs producing less than half its maximum load.
My earlier patent application G.B.9105602.8 stated that: In the case of a single cylinder petrol engine with fuel injection, the injection system is of the type where injection is triggered to occur at a specific point in the cycle, usually during the induction stroke. Two separate trigger devices are used to cause fuel to be injected on alternate cycles. A shaft may be driven at 1/4 crankshaft speed. Mounted on this shaft are two magnets, namely magnet 27 and magnet 28. Two coils register with the magnets. Coil 29 registers only with magnet 28 and coil 30 registers only with magnet 27.
The magnets and coils are arranged so that magnet 28 passes coil 29 inducing a current to cause fuel to be injected into the engine during the induction stroke on cycle 1. On the next cycle, cycle 2, magnet 27 triggers coil 30 to cause a similar fuel injection. On the third cycle 29 followed by 30 etc.
Wires connect coil 29 and coil 30 to the fuel injection metering device so that a signal from 29 or 30 will trigger the injection of fuel. A switch 31 is fitted in the wire from coil 30 to the metering device. Switch 31 is operated directly or indirectly by the throttle or accelerator position. When the accelerator pedal demands more than 50% engine load, switch 31 is closed providing normal fuel injection on each 4 stroke cycle. When the accelerator pedal demands less than 50% engine load, Switch 31 is open, causing fuel to be injected on alternate cycles, i.e. an 8 stroke cycle.
Multi-cylinder engines may be provided with separate, alternate acting coils as 29 & 30 for each cylinder. In practice, however, electronic circuits can correctly time and sequence the desired fuel injection described above from one or more engine speed related events, such as an impulse in the ignition circuit. Engines with an odd number of cylinders only provide regular cycles in both 4 stroke and 8 stroke modes.
The triggering and sensing devices and the controls can be electrical, mechanical, magnetic, hydraulic or any other means, to provide the alternate air only induction or 8 stroke cycle. In place of the alternate sequence
REFERENCES:
patent: 4237832 (1980-12-01), Hartig et al.
patent: 4392459 (1983-07-01), Chareire
patent: 4688532 (1987-08-01), Hasegawa
patent: 4781154 (1988-11-01), Tanahashi et al.
patent: 4834048 (1989-05-01), Adamis et al.
patent: 5005539 (1991-04-01), Kawamura
patent: 5038739 (1991-08-01), Ishii
patent: 5056486 (1991-10-01), Johannes
patent: 5063899 (1991-11-01), Hitomi et al.
patent: 5069175 (1991-12-01), Simko
patent: 5259344 (1993-11-01), Huang et al.
LandOfFree
Piston engine cycles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Piston engine cycles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piston engine cycles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-671556