WO2011037567A1

WO2011037567A1 - Fuel vaporizer for fuel injected engines

Info

Publication number: WO2011037567A1
Application number: PCT/US2009/058271
Authority: WO
Inventors: Gerald W. Rowley
Original assignee: Rowley Gerald W
Priority date: 2009-09-24
Filing date: 2009-09-24
Publication date: 2011-03-31

Abstract

Free heat from an exhaust manifold of an internal combustion engine or an electric heater supplies heat to a vaporizer. Gasoline is converted from fluid to vapor in the vaporizer and sent directly to the fuel injectors. Water fog may be added to the air intake manifold. One embodiment adds a catalyst to the vaporizer to convert gasoline to propane vapor. Fuel efficiency from 30 to 43 miles per gallon has been tested.

Description

FUEL VAPORIZER FOR FUEL INJECTED ENGINES

FIELD OF THE INVENTION

The present invention relates to pre-heating fuel such as gasoline, alcohol, kerosene, diesel or ethanol before injecting the heated fuel vapors into a fuel system on an internal combustion engine.

BACKGROUND OF THE INVENTION

U.S. Patent No. 6,578,532 (2003) to Rowley discloses a fuel vaporization system for carburetor type gasoline engines. A fuel vaporization chamber is in fluid communication with the gas tank. The fuel vaporization chamber is in thermal contact with the engine exhaust. The fuel vapors are sent to a molecule mixture box where water vapor is added. A fuel blower from the molecule mixture box sends the vapor mixture to the intake manifold. Fuel efficiency is increased.

What is needed is a fuel vaporization system tailored to an electronic fuel injected engine with multiple injectors. The present invention supplies such a device. In the present invention, a gasoline fuel pump connects to a pressure regulator and reduces the fuel pressure to about 40-60 psi. The fuel enters a vaporization chamber which is heated by exhaust heat via the exhaust manifold. A metering needle valve supplies raw gas at a specific quantity to be vaporized before allowing another quantity of fuel to enter the heating chamber. The vaporized fuel leaves the heating chamber to the fuel rail to the existing fuel injectors. Water vapor is also injected into the air intake manifold. This invention is non-obvious for several reasons, including, but not limited to, that it improves mileage from 30 mpg to 43 mpg and eliminates two mechanical blowers and a molecule mixture box from the '532 patent.

SUMMARY OR THE INVENTION

An aspect of the present invention is to supply vaporized gasoline or other liquid fuels to fuel injectors to improve engine efficiency. Another aspect of the present invention is to use exhaust air heat to vaporize the gasoline.

Another aspect of the present invention is to inject gasoline vapors directly into the fuel line supplying fuel to the injections on the fuel rail.

Another aspect of the present invention is to provide a thermostatically controlled heat exchanger for the vaporizer.

Another aspect of the present invention is to provide an embodiment that converts gasoline to propane vapors via a catalyst.

Another aspect of the present invention is to provide a battery operated electric heater to vaporize the fuel.

Another aspect of the present invention is to provide a metal block embodiment having an electric heater and a fuel channel .

Other aspects of this invention will appear from the following description and appended claims, reference being made to the accompanying drawings forming a part of this specification wherein like reference characters designate corresponding parts in the several views.

A vaporizer is physically connected to an exhaust manifold of an engine or an electric heating element. About 600° F heat is available to vaporize gasoline in the vaporizer. The heating chamber will operate in the range of about 250^UF to about 475° F. In this range most liquid fuels will be vaporized. Inside the vaporizer a reservoir of fluid floats a float. When the fluid vaporizes the float drops, thereby opening a needle valve to feed more raw fuel into the reservoir. The vapors move to the fuel injector supply line via a separate port. A fogged (misted) water is sprayed into the air intake manifold which mixes with the incoming air. A propane embodiment adds a catalyst such as silica alumina to the vaporizer to create propane vapors from gasoline liquid/vapor.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. I is a schematic drawing of a gasoline to propane vapor embodiment. FIG. 2 is a schematic drawing of a gasoline vapor embodiment

FIG. 3 is a top perspective view of a vaporizer installed on an engine.

FIG. 4 is a cross sectional view of the gasoline vaporizer shown in FIG. 3.

FIG. 5 is a side perspective view of an alternate clamp fixture for the vaporizer.

FIG. 6 is a schematic drawing of an exhaust gas heated vaporizer.

FIG. 7 is an exploded view of the exhaust gas heated vaporizer of FIG. 6.

FIG. 8 is a cutaway view of an electric heated embodiment.

FIG. 9 is a top perspective view of an electric block embodiment.

FIG. 10 is a side elevation view of the electric heater module of the FIG. 9 embodiment. FIG. 1 1 is a side elevation view of the central fuel module of the FIG. 9 embodiment. FIG. 12 is a side elevation view of the end module of the FIG. 9 embodiment.

FIG. 13 is a cross-sectional view of the central fuel module taken along line 13- 13 of FIG. 1 1.

FIG. 14 is a circuit layout of the 02 sensor to offset the 02 signal.

Before explaining the disclosed embodiment of the present invention in detail, it is to be understood that the invention is not limited in its application to the details of the particular arrangement shown, since the invention is capable of other embodiments. Also, the terminology used herein is for the purpose of description and not limitation.

DETAILED DESCRIPTION OF THE DRAWINGS

Referring first to FIG. 1 an internal combustion engine 55 has a fuel rail 61 sending fuel to fuel injectors 62. The unused fuel is returned to the fuel tank 10. An exhaust manifold 50 supplies heat to a vaporizer V I . An optional thermostatically controlled heat exchanger 46 may interface between the vaporizer V21 and the exhaust manifold 50. Coolant line 461 decreases the temperature of the vaporizer V I as controlled by a thermostat in heat exchanger 46.

A fuel pump 20 pumps gasoline from tank 10 to pressure regulator 30 (nominally a allory™ 4309) to drop typical fuel pump pressure of 40-80 psi to about 40-60 psi via pipe F to the vaporizer V I . T e vaporizer V! has an outside housing 41 which supports a catalyst 3 1 (preferably silica, alumina). An inside guide 43 supports a float 40 to float in fluid gasoline on the bottom of the vaporizer V I . Heat from the exhaust manifold 50 heats the vaporizer V I which then vaporizes the fluid gasoline, and via the catalyst 31 , turns it into a propane vapor, thereby lowering the fluid level and dropping the float 40. By dropping the float 40 the needle N drops from its seat 44, thereby sending raw fuel into the heating chamber 444. The vaporized gasoline travels through tube 460, a tube sitting in the catalyst bed. The gasoline vapor is converted to propane vapor. The propane vapor moves to an expansion chamber 60 then thru pipe 600 to the fuel rail 61 .

The intake manifold 32 feeds air to the intake side of the cylinder head. The intake manifold 32 has an air filter 80, and a pressurized water reservoir 70 which injects water into the intake manifold 32 via a water fogger nozzle 71 and pipe 72. A stationary spiral baffle 81 mixes the water fog and air mixture. The air intake valve 83 regulates the fuel/air mixture.

Referring next to FIG. 2 a vaporizer V2 converts fluid gasoline to vapor gasoline on the same engine 55. The vaporizer housing 430 supports some metal shot 49 used in the heat exchange operation. The housing is preferably stainless steel metal. The float 40 is preferably a stainless steel globe. The needle valve seat 44 is preferably brass. The needle M is preferably made of Viton™ or any high temperature composite material. All of the above materials are considered non-limiting. When the float 40 drops, raw gasoline enters the valve seat 44 re-filling the reservoir 430. The vaporized fuel enters the vapor line 57 which connects to the fuel rail 61 which pushes vaporized fuel into the injectors 62.

What vaporized fuel is not used by the injectors 62 passes through the end of the fuel rail 61 to the secondary fuel regulator 63. The vaporized fuel passes through the secondary regulator 63 and returns to the fuel tank 10 via a fuel return line 64. The vaporized fuel recondenses into liquid as it travels to the fuel tank. Throttle control of the engine is maintained by the computer module. The computer senses when the throttle body (not shown) is opened up more which relays a signal to allow the injectors to increase fuel flow to the cylinders.

Referring next to FIGS. 3, 4 the vaporizer V2 is seen in more detail. The housing 430 has top 43 1 bolted to the housing 430 with a gasket 56 therebetween. The bottom of housing 430 has a heat sink 52 and a heat exchanger 53, which could be ceramic (such as Zerconium) or metal . Heat exchanger 53 may be physically connected to the exhaust manifold 50, and/or receive heat from heat exchanger lines 461 which are preferably steel lines filled with silicon oil and pumped thermostatically by a control pump 46 to maintain a constant temperature.

Inside the housing 430 the float 40 may travel up and down the inside of housing 430 with nominally about a 1/16 inch clearance, dl . A (brass) guide/pin 48 supports needle N. A nominal clearance of about 40/1000 inch may exist between guide 48 and the side wall of the seat 44, d2. A (threaded) rod 47 is rigid and connects the float 40 to the needle N via guide/pin 48. Nut 470 provides adjustment for the needle N in the float 40.

The preferred material for the ceramic heat exchanger 53 is a zircon based cement such as Sauereisen™ Zircon Potting Cement No. 13, Pittsburgh, PA, though such is not considered limiting.

Product Identification

Product Name 13 Zircon Potting Cement

Item Number 13-Q

Item Description Zircon Potting Cement (PWD)

Product Description Zircon Potting Cement (Powder)

Chemical Family Magnesium Phosphate Cement

Revision Date 1 1/30/05 Composition and Data on Components

Component/CAS # ACGIH TLV OSHA PEL % WT

Zirconium Silicate 10 MG/M3 (TWA) 15 MG/M3 (STEL) <75%

14940-68-2

Silica, Crystalline 0.025 MG/Ivf TWA 0. 1 MGM/Ivf STEL <1%

14808-60-7

Magnesium Oxide 10 MG/M³ (DUST) I 0 MG M³ (DUST) < 15%

1309-48-4

Referring next to FIG. 5 the vaporizer V2 is held in thermal contact with the exhaust manifold 50 by means of a dual clamp 500. A clamp base 507 rests against housing 430 and is secured to the housing 430 by means of a clamp top, bolt 508 and wing nut 510. The base 509 of bolt 508 is pivotally mounted in clamp base 507. An exhaust base 502 connects to the vaporizer base 507 at junction 520 at a desired angle to keep the vaporizer V2 upright as shown. A hole can be drilled between the two bases and a pin inserted (not shown) to secure the bases. The exhaust base 502 is secured against the exhaust manifold 50 by means of a clamp top 501 , bolt 503 and wing nut 504. The bolt 503 has pivot mount 513 to the exhaust base 502. This clamp embodiment provides a universal type mount for the vaporizer V2 to fit on many sizes of exhaust manifolds 50.

Referring next to FIG. 6 a vaporizer assembly 4300 consists of the housing 430 and its internal parts described in FIG. 2, plus a side and lower heating chamber 431. The heating chamber 431 receives exhaust gas from manifold 50 via pipe 432. The hot exhaust gas surrounds the base and sides of housing 430 and vaporizes the fuel. The exhaust gas is then returned to the manifold via pipe 433. Referring next to FIG. 7 the vaporizer assembly 4300 consists of the housing 430 installed inside heating chamber 431 which leaves a gap G around the housing 430. A washer 440 seals the top of the heating chamber 43 1.

Referring next to FIG. 8 a heating chamber 800 consist of a housing 801 protected by an insulator 802. The housing 430 fits inside the housing 801 , and the gap G of FIG. 7 is filled with an electric resistor 803, which is packed in a cement 804. Glass beads 805 are placed on the electrical resistor to provide adequate spacing in the gap G. The electric resistor 803 is preferably a nichrome wire cut to the length needed to reach vaporization temperature. A thermostat can be added for additional stabilization of temperature. An optional thermostat 850 is shown with lead wires 851 going to a controller 852. The controller 852 manages via the wire 855 power output from the power source 856 to the resister leads 853, 854.

Referring next to FIG. 9 a heater block vaporizer 900 consists of three modules which are slabs that form aluminum block 900. Module 901 is an electric heater slab with a positive connection 904 for a resistor 910 and a negative connection 905 for the resistor (preferably Nichrome wire). In FIG. 10 the channel 912 is chosen at a length for the resistor 910 to maintain vaporization temperature of the fuel. A cement 91 1 surrounds the resistor 910. An optional thermostat 850 can control the power to the leads 904, 905 via the controller 852.

In FIG. 1 1 the back 1 100 of module 902 seals off the channel 12. A serpentine fuel channel 1 101 is chosen at a length (such as, 36 inches by 5/16 inch deep) such that liquid fuel entering entry port 906 vaporizes before it leaves exit port 907. The channel 1 101 is intersected by 3/8 inch scalloping holes 1 102 to allow the fluids to swirl and absorb more heat. In FIG. 12 shows a side elevation view of a block of (preferably) aluminum 903 used to complete the vaporizer 900. This construction allows a milling operation to create the fuel channel 1 101 before final assembly.

FIG. 13 shows the machined scalloping holes 1 102 in the fuel channel 1 101. These scalloping holes 1 102 force the fuel over increased surface area of the heated channel 1 101 , thereby absorbing more heat in less distance of travel in channel 1 101. In FIG. 14 an engine control circuit (ECU) 1400 has been altered with a variable DC offset voltage circuit 1401 to correct outputs from the 02 sensor for use of the present vaporizer invention. The LM7803 is a volt converter, and DCPO l (1402) is an isolated power supply.

A program change is needed for the fuel saving device to operate correctly with fuel injected vehicles/engines with emission control equipment. Most modern vehicles 1996 and newer are equipped with OB2 computers. Oxygen sensors, MAF sensors, throttle body positioning sensors, and other sensors that make up the emission control package. The OB2 computer uses information or the signal from the 02 sensor(s) to determine if the air/fuel mixture is too rich or too lean. Most vehicles are designed to operate at a Stoichiometric Ratio of 14.7 to 1. This standard is set by the OEM industry. This air/fuel ratio which indicates 14.7 parts of air to one part of fuel. This air/fuel ratio is also known as Lambda. Modern engines are set to run at Stoichiometric or Lambda. Lambda is also known as 1. Lambda is a convenient number to work with since its value represents the correct Stoichiometric mixture. If the engine exhaust shows less than Lambda this indicates a richer mixture. If the engine exhaust shows above Lamgda this indicates a leaner mixture. The OB2 computer uses the signal from the 02 sensors to determine if more or less fuel should be added to the mix in order to maintain Lambda at 1 . This scenario is okay when no fuel efficiency device is added to the vehicle's engine. The problem that is encountered when the fuel efficiency device of the present invention is added to the engine is an increase in oxygen in the vehicle's exhaust. The fuel saving device burns the fuel more efficiently which causes the oxygen content in the exhaust to rise. The oxygen rises in the exhaust for a number of reasons: a) Less fuel is being used to produce an equivalent amount of horsepower, and b) less oxygen is being consumed to create carbon monoxide and oxides of nitrogen. This increased oxygen level is detected in the exhaust by the 02 sensor(s) and a signal is sent to the vehicles' computer. This increased oxygen signal is sensed by the OB2 computer and thinks that the air/fuel mixture is above Lambda or too lean a mixture. The computer uses this artificial relationship to upset the fuel efficiency device by dumping in more fuel in the mix in an attempt to bring the engine back to a Stoichiometric Ration of 14.7 to 1 air/fuel ratio. This action actually negates the fuel savings of the fuel efficiency device and in some cases will cause a higher increase in fuel consumption. The solution for this series of events is that the signal coming from the 02 sensor(s) needs to be adjusted before it gets back to the computer signaling the correct amount of oxygen in the exhaust than there actually is. Fooling the computer to think this way and allow the fuel efficiency device to function properly can be done in several ways. Option 1 ) a V.A.L.V.O.C. circuit can be wired between the 02 sensor(s) and the 0B2 computer. V.A.L.V.O.C stands for Varying Adjustable Low Voltage Offsetting Circuit. This circuit adjusts the low voltage signal from the 02 sensor(s) and offers the signal going to 0B2 computer. This offset circuit actually gives a slight increase in voltage to the existing signal thus giving a richer mixture reading to the 0B2 computer. This in turn allows the computer to make adjustments shutting down fuel to the injectors. This same effect can be brought to bear on the 0B2 computer using Option (2) and Option (3). Option (2) A chip can be programmed for the 0B2 computer to offset/adjust the 02 sensor(s) signal to indicate a richer mixture and close down the fuel injectors just as the V.A.L.V.O.C circuit. Option (3) the 0B2 computer can be flashed with a computer interface with similar files as the chip mentioned in Option (2).

The various dimensions, measurements, and materials described above are not considered limiting and other dimensions, measurements and materials can be used and all are considered within the scope of the invention.

Although the present invention has been described with reference to preferred embodiments, numerous modifications and variations can be made and still the result will come within the scope of the invention. No limitations with respect to the specific embodiments disclosed herein is intended or should be inferred. Each apparatus embodiments described herein has numerous equivalents.

Claims

1. A fuel vaporizer for an internal combustion engine, said fuel vaporizer comprising:

a heat exchanger;

a vaporizer assembly heated by the heat exchanger;

said vaporizer assembly having a liquid fuel inlet line which deposits liquid fuel via a valve body bottom of the vaporizer assembly;

a float which floats on the liquid fuel at the bottom of the vaporizer assembly; said float having a valve needle attached to its top;

wherein heat from the heat exchanger causes the liquid fuel to vaporize, thus causing the float to more lower, thus pulling the needle from the valve body, thus allowing more liquid fuel to flow to the bottom of the vaporizer assembly;

a vapor exit line connected to an upper portion of the vaporizer assembly; and said vapor exit line conveying a fuel vapor to a fuel rail of the internal combustion engine.

2. The apparatus of claim 1 , wherein the engine further comprises an air intake manifold having a water injection system attached thereto, wherein an air/water mixture is mixed with the fuel vapor via a fuel injector.

3. The apparatus of claim 1 , wherein the heat exchanges further comprises a heat sink attached to an exhaust manifold of the internal combustion engine.

4. The apparatus of claim 2, wherein the heat exchanger has a coolant supply with a thermostatic control to maintain the heat exchanger at a set temperature.

5. The apparatus of claim 3, wherein the heal sink further comprises a clamp for connection to an exhaust manifold.

6. The apparatus of claim 1 , wherein the vaporizer assembly further comprises metal shot inside at the bottom to increase the vaporizing efficiency.

7. The apparatus of claim I , wherein the vaporizer further comprises a catalyst at the bottom, wherein the liquid fuel comprises gasoline, the vaporizing creates gas vapor that have feed line into the catalyst, and a propane vapor rises from the catalyst and exits the vaporizer assembly via the vapor exit line.

8. The apparatus of claim I , wherein the heat exchanger further comprises a container surrounding a portion of the vaporizer assembly, said container having a tap into an exhaust manifold to utilize exhaust gas as a heat source as the exhaust gas contacts the vaporizer assembly.

9. The apparatus of claim 8, wherein the container further comprises a return gas connection to the exhaust manifold.

10. The apparatus of claim 1 , wherein the heat exchanger further comprises a container surrounding a portion of the vaporizer assembly, said container having an electric heating element therein to heat the vaporizer assembly.

1 1. The apparatus of claim 10, wherein an electric heating element heat output is chosen to stabilize a temperature of the vaporizer assembly at a chosen set point and further control is added with a thermostat.

12. The apparatus of claim I I , wherein the electric heating element is surrounded with a potting cement inside the container.

13. A fuel vaporizer for an internal combustion fuel injected engine having a fuel rail, the fuel vaporizer comprising:

a heat exchanger;

a vaporizer assembly heated by the heat exchanger;

said vaporizer assembly having a liquid fuel to deliver liquid fuel to a bottom of the vaporizer assembly;

a float which floats on the liquid fuel at the bottom of the vaporizer assembly; and a valve means associated with the float functioning to open the liquid fuel inlet when the float lowers as the liquid fuel vaporizes and fuel vapor travels to the fuel rail.

14. A fuel vaporizer comprising:

a first module having a body with a liquid fuel inlet and a channel in the body which connects to a vapor fuel outlet;

a second module having a heater and associated with the first module so as to provide a heat exchange to the first module to keep the second module as a set point temperature;

wherein the channel has length sufficient to vaporize all the liquid fuel when the first module is at the set point temperature.

15. The apparatus of claim 1 , wherein the first module is a metal plate with the channel having a serpentine or zig zag pattern in the plate, and the channel has fluting or scalloping to increase its vaporization surface.

16. The apparatus of claim 15, wherein the second module is a second metal plate adjoining the first module, said second metal plate having an electric heating element therein which is mounted in a channel having a serpentine or zig zag pattern.

18. The apparatus of claim 16, wherein the first module further comprises construction from two metal plates, and the second module further comprises its channel formed into its second metal plate before being fastened to the first module.

19. The apparatus of claim 14, wherein the set point temperature is in the range of about 325 to 425° F.

20. The apparatus of claim 19, wherein the channel has a width of about 5/16 inch, and a length of about 30 to 40 inches.