Internal-combustion engines – Charge forming device – With fuel pump
Reexamination Certificate
1999-04-23
2001-03-13
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Charge forming device
With fuel pump
Reexamination Certificate
active
06199541
ABSTRACT:
FIELD OF INVENTION
This invention relates to an improved and simplified means for timed delivery of fuel—in the form of liquid, vapor, gas, or in combination with air—in reciprocating piston, internal combustion engines.
BACKGROUND DISCUSSION
A variety of controlled fuel delivery means exist for reciprocating piston internal combustion engines. One of the most common involves injecting fuel directly into the combustion chamber, as applied in most diesel and gasoline engines. Injectors connected to external pumps are mechanically complex and require complicated control and timing means. One of the limitations of injectors is in their ability to filly disperse liquid fuel inside of the combustion chamber prior to combustion. Injectors need precise nozzles to improve this situation. In some applications, an air and fuel mixture is injected into the combustion chamber which further improves the fuel dispersion, however, external compressors are typically used for this purpose which become more sophisticated when fuel delivery into higher compression ratio engines is required.
Other known methods of delivering fuel in two-stroke engines involve drawing a fuel and air mixture into an area under the primary reciprocating piston, usually the cylinder and crank case, by the vacuum created by the piston's upstroke. The fuel and air mixture is then pressurized by the subsequent down-stroke. When it reaches the maximum pressure below the piston, the fuel and air mixture is allowed into the combustion chamber, above the piston, using a controlled pathway. At this point, fuel and air is delivered into the combustion chamber prior to the compression stroke, due to the piston being in the down position. Consequently, the fuel and air are compressed together in the combustion chamber by the primary piston, therefore, compression can not exceed the pressure where pre-ignition would occur from the adiabatic heating. Disadvantages which result are: lower potential for efficiency gains that are realized with high compression ratios; the need for an ancillary ignition means to control ignition, plus additives in the fuel such as octane. In addition, the air and fuel mixture is typically used to scavenge the exhaust from the combustion chamber, as in the cross flow configuration which tends to allow fuel to be lost through the exhaust port prior to combustion resulting in further efficiency losses.
In four-stroke engines, when injectors are not involved, the typical fuel delivery occurs during the down stroke of the engine's cycle, when fuel enters the combustion chamber prior to compression which requires limiting the compression ratios.
OBJECTS AND ADVANTAGES
The Internal Ram Fuel Delivery (IRFD) means discussed in the following specifications simplifies the mechanical requirements, as compared to prior methods, for timed delivery of a highly pressurized fuel into highly compressed air within an engine's combustion chamber. The IRFD is also capable of delivering fuel and air mixtures. Delivering an air and fuel mixture into the compressed air within a combustion chamber is a highly effective way to achieve fuel dispersion. The ability to time the delivery of a fuel and air mixture would allow for higher compression of the air within the combustion chamber prior to combustion. In combination, these effects generate better combustion of fuel, resulting in lower emissions and greater fuel efficiency.
The IRFD could be used with low grade fuels in diesel engines, due to its potential for delivering fuel and air/fuel mixtures at high pressures at a predetermined point. The IRFD could potentially be used with non-petroleum alternative fuels.
The IRFD could also be used as a pre-combustion means, which could deliver combustion gasses into the reciprocating piston cylinder.
IRFD can also be applied to the cross-flow gasoline, two-stroke configuration to improve efficiency and to decrease emissions, because fuel would not be lost out the exhaust port. The IRFD could also make the cross-flow engine more efficient by allowing for higher compression ratios and the use of lower grade fuels.
Further advantages of the IRFD will become apparent from consideration of the drawings and ensuing description.
INTRODUCTORY DESCRIPTION
The Internal Ram Fuel Delivery (IRFD) is a fuel delivery means to be used with a reciprocating piston, internal combustion engines. Although the IRFD is potentially viable for use in four-stroke engines, the preferred application is with two-stroke engines, especially those of the cross-flow configuration. Fuel could include any combustible material in the form of a liquid, vapor, gas, or in combination with air—the air and fuel combination being preferred. The main components of the IRFD operate inside the engine's primary cylinders and combustion chamber, in conjunction with reciprocating movement of the engine's main piston.
The IRFD concept could have many possible configurations; however, only two general configurations are most likely to be practical for application. The ensuing portion of the specification will be divided into two parts for separate discussion of these two general configurations.
The first part, titled Configuration I, pertains to a general configuration of the IRFD, including several of the many possible derivative embodiments. In this configuration, a secondary piston, or ram, is attached to the primary piston(s) in an engine and travels inside a stationary ram cylinder which is attached to the top of the primary piston's cylinder.
The second part, titled Configuration II, pertains to another general configuration, including several of its many possible derivative embodiments. The main components are a ram cylinder that is attached to, or housed inside of an engine's primary piston(s) and travels on a stationary ram which is attached to the head of the primary piston's cylinder.
REFERENCES:
patent: 1843606 (1932-02-01), Leonard
patent: 2462854 (1949-03-01), Gates
patent: 2846987 (1958-08-01), Nettel
patent: 4048971 (1977-09-01), Pritchett
patent: 5448979 (1995-09-01), Clarke
patent: 5473893 (1995-12-01), Achten et al.
patent: 6050244 (2000-04-01), Wilhelm
Castro Arnold
Rogers Peter T.
Yuen Henry C.
LandOfFree
Internal ram fuel delivery does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Internal ram fuel delivery, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal ram fuel delivery will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2532232