After-market gaseous fuel and petrol engine conversion system

The invented system adds some petrol fuel to the vehicle engine which runs with natural gas (CNG or LPG). It causes a simultaneous combustion of petrol and natural gas (CNG or LPG). This action decreases depreciation of engine, increases power of the engine and reduces fuel consumption in natural gas vehicles. The above-mentioned system consists of an innovative petrol holder storage, an electronically circuit, a relay, a lever micro switch and a petrol fuel injector. Whenever the accelerator pedal is pressed more than a certain amount, the system will be activated and command to inject petrol collected in the storage into the air manifold.

FIELD OF THE INVENTION

The present invention is planned to improve and modify fuel system in natural gas (CNG or LPG) vehicles. Specifically the above-mentioned system has been invented to inject extra petrol fuel to rectify some problems of fuel system in the current bi-fuel vehicle while the engine runs with natural gas (CNG or LPG). It's applicable on both vehicles with carburetor and fuel injection system.

BACKGROUND OF THE INVENTION

Natural gas not only is more economical than petrol and gasoline, but also produces less air pollution in comparison with mentioned fuels; therefore, researchers have more tendencies toward natural gas rather than the others. Using high efficiency engines that run with natural gas solely, necessitates designing more compatible natural gas burner engines. For two reasons, decision makers in automobile industries didn't show intention in manufacturing engines running with natural gas solely. First of all, natural gas is not able to produce power as strong as petrol or gasoline. Secondly, natural gas is not available all over the world.

Researchers, who didn't completely disappointed of usage of natural gas in automobile industry, advise people to convert their petrol fuel system vehicle to bi-fuel by applying some changes. Because of appropriate cost of natural gas, bi-fuel systems became prevalent in some countries but drivers of bi-fuel system vehicles usually complained of power of their automobile engine while their automobile runs with natural gas. They are being forced to switch to petrol fuel instead of natural gas in many cases like Uphill roads, pickup trucks loading and starting in low ambient temperature. Switching to petrol fuel was not desirable and it was averse the goal of bi-fuelling. Among the other deficiencies of bi-fuel system, depreciation of engine due to dryness of natural gas is worthy of mention which diminishes the engine life.

SUMMARY OF THE INVENTION

The aforesaid problems of previous systems are solved by installing the invented system on the fuel system of vehicle. By pressing on the accelerator pedal more than a certain amount, the system will be activated and some extra petrol inject to the engine that runs with natural gas. Combustion of natural gas and petrol simultaneously, increase the power of the engine dramatically so the vehicle can be derived on natural gas mode in Uphill roads even in mountainous roads, loaded heavily and started in any ambient conditions by pressing the accelerator pedal. As a result, the driver always becomes needless to switch to petrol mode when the engine runs in natural gas mode.

In traffic jam and downhill roads the driver doesn't press the accelerator pedal; thus the invented system doesn't inject any extra petrol fuel to the engine. In addition the injected petrol alleviates dryness of natural gas, thus deprecation of the engine stepped down and engine longevity will be increased.

According to results of test experiments on a Nissan Patrol, installation of the invented system reduces 50 percent of consumption of natural gas by injecting about 1 litter petrol per each 100 kilometers that obviously shows a noticeable deduction in consumption of natural gas. In addition needles of switching to petrol mode also little petrol used in this system causes a reduction in air pollution produced in comparison with bi-fuel vehicle and normal petrol vehicle.

DETAILED DESCRIPTION OF THE INVENTION

According toFIG. 1showing a bi-fuel vehicle, in natural gas mode, natural gas is sent from gas tank1to pressure regulator6through a natural gas line3and then after adjusting the pressure of the gas it is transferred to a natural gas fuel rail and injectors13and then injected into engine14and is mixed with inlet air from manifold12to complete combustion process. On natural gas fuel system mode, petrol fuel rail and injectors17don't inject any petrol to engine14and therefore it solely runs by natural gas.

By applying hose connectors15and16and making branches from inlet petrol line4and outlet petrol line5respectively, installing lever micro switch9located under accelerator pedal8, relay10, injector11and petrol holder storage7, fuel system of a bi-fuel vehicle will be improved and modified.

According toFIG. 2it could be described how the invented system functions. The invented system100is illustrated inFIG. 2. By pressing on the accelerator pedal8more than one third of its movement amplitude, the lever micro switch9located under accelerator pedal8is connected and the relay10is energized by electricity of battery19. The relay then sends pulses with specific frequency to actuate an electrical valve that is an injector11. Petrol is flowed from petrol tank2by pump22through petrol inlet line4to aluminum petrol holder storage7so that the storage is always full of petrol. Pulses that are transmitted from relay10to injector11; cause opening and closing of the orifice of injector11; therefore, petrol of the storage7is sprayed to air manifold12via21(that will be explained inFIG. 3).

On the other hand, natural gas is transferred to pressure regulator6from gas tank1through natural gas line3. After adjusting the pressure it is sent to a fuel rail and injectors13and injected to engine14so the combustion is done in the engine with a mixture of air, petrol and natural gas. It is necessary to mention that the surplus petrol accumulated in petrol holder storage7is backed to petrol tank2via petrol outlet line5.

A two-state switch20is designed on the relay10. It is an on\off mode switch. On the off mode the invented system is isolated from vehicle fuel system. It should be said that the control system of extra injected petrol doesn't interfere with vehicle ECU (18in theFIG. 1). It is a separate system that the driver can deactivated it any time.

FIG. 3Bis a photo showing the above-mentioned aluminum petrol holder storage7. Petrol enters in to the storage unit from input23and excess petrol is exited from output24and backed to petrol tank. Injector11that is shown inFIG. 3Ais mounted on the top of the petrol holder storage7. Petrol is injected from11to the orifice25inFIG. 3Cthat is concentric with the output of injector11. Output21is the only escape for input23that is connected to air manifold so petrol is sprayed to air manifold (12inFIG. 1andFIG. 2).

As seen inFIG. 4displays a simultaneous use of single point injector and multi point injector in the fuel system of vehicles. Natural gas fuel is injected to engine14by natural gas fuel rail and multi point injectors13and petrol fuel is injected to engine14by the single point injector11connected to air manifold12so we have injection of petrol and natural gas at the same time. InFIG. 4natural gas, inlet air and petrol respectively show with yellow, blue and red colors.

By pressing on the accelerator pedal more than a certain amount, the system will be activated and some extra petrol inject to the engine that runs with natural gas. Combustion of natural gas and petrol simultaneously, increase the power of the engine dramatically so the vehicle can be derived on natural gas mode in Uphill roads even in mountainous roads, loaded heavily and started in any ambient conditions by pressing the accelerator pedal. As a result, the driver always becomes needless to switch to petrol mode when the engine runs in natural gas mode.

In traffic jam and downhill roads the driver doesn't press the accelerator pedal; thus the invented system doesn't inject any extra petrol fuel to the engine. In addition the injected petrol alleviates dryness of natural gas, thus deprecation of the engine stepped down and engine longevity will be increased.

According to results of test experiments on a Nissan Patrol, installation of the invented system reduces 50 percent of consumption of natural gas by injecting about 1 litter petrol per each 100 kilometers that obviously shows a noticeable deduction in consumption of natural gas. In addition needles of switching to petrol mode also little petrol used in this system causes a reduction in air pollution produced in comparison with bi-fuel vehicle and normal petrol vehicle.