JPH0754597Y2 - Gasoline cooling system - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The gasoline cooling device according to the present invention uses a fuel pump to remove excess gasoline that has not been fed into the cylinder of the engine from the fuel taken out from the fuel tank by the fuel pump. By cooling before returning to the tank, the evaporation amount of gasoline in the fuel tank is suppressed, and by cooling the gasoline remaining in the fuel gallery after the engine is stopped, evaporation of gasoline in the fuel gallery is suppressed. ,
It is intended to improve the restartability of the engine.

(Prior Art) A gasoline supply device for supplying gasoline into a cylinder of a gasoline engine for driving an automobile is configured, for example, as shown in FIG.

Reference numeral 1 denotes a fuel tank that stores gasoline. The gasoline in the fuel tank 1 is taken out by a fuel pump 2, a flow is smoothed by a fuel damper 3, and impurities are removed by a fuel filter 4, and then an injector 5 is used. And the pressure regulator 6.

The set pressure of the pressure regulator 6 changes depending on the operating state of the engine, and the excess gasoline not injected into the intake manifold 8 of the gasoline engine 7 by the injector 5 passes through the return pipe 9 having one end connected to the pressure regulator 6. Above fuel tank 1
Returned to.

(Problems to be solved by the invention) By the way, as described above, the gasoline returned to the fuel tank 1 through the return pipe 9 rises in temperature due to adiabatic compression by the fuel pump 2 and also passes through a warm engine room. It is unavoidable that the temperature becomes higher than that of gasoline originally stored in the fuel tank 1.

Therefore, when the engine continues to operate, it is inevitable that the temperature of the gasoline stored in the fuel tank 1 gradually rises.

When the temperature of gasoline in the fuel tank 1 rises, the amount of gasoline evaporated in the fuel tank 1 increases,
When the amount of gasoline vapor sent to the canister 29 (see FIG. 1; omitted in FIG. 2) for collecting harmful components such as hydrocarbons (HC) contained in gasoline vapor increases, HC diffuses into the atmosphere, or bubbles of gasoline vapor clog the fuel pipe, causing a so-called vapor lock, making it impossible to operate the engine.

According to Japanese Utility Model Laid-Open No. 54-134823, as shown in FIG. 3, a heat exchanger 11 is provided between the fuel tank 1 and the carburetor 10, and the heat exchanger 11 is arranged in the middle of the intake manifold 8. By doing so, the structure for cooling the gasoline sent to the carburetor 10 is described.

However, in the case of such a structure, the percolation in the float chamber 12 of the carburetor 10 can be sufficiently prevented, but the effect of preventing the evaporation of gasoline in the fuel tank 1 is small, and HC diffuses into the atmosphere. Not only can this be effectively prevented, but the prevention of the vapor lock in front of the heat exchanger 11 is also insufficient.

When the engine is stopped, the injector 5
It is unavoidable that gasoline taken into the fuel gallery provided with (Fig. 2) evaporates due to residual heat of the engine.

In this way, when the gasoline present in the fuel gallery evaporates, gasoline vapor that exceeds the adsorption capacity of the canister is generated, increasing the possibility that HC will diffuse in the atmosphere, The startability deteriorates.

Japanese Utility Model Publication No. 61-9550 discloses a structure for cooling the fuel gallery part by using a heat pipe, but since it is a structure separate from the cooling of the gasoline returned to the fuel tank, The entire structure for cooling gasoline becomes complicated.

The gasoline cooling device of the present invention eliminates such inconvenience.

(Means for Solving the Problems) The gasoline cooling device of the present invention is a sub radiator that is independent of the main radiator for radiating cooling water for a gasoline engine, and the cooling water radiated by this sub radiator and the gasoline engine. By exchanging heat with the excess gasoline that is not taken into the sorting means that separates the gasoline sent to the cylinder, the gasoline cooler that cools this excess gasoline and then returns it to the fuel tank, and the gasoline that is taken into the sorting means A cooling water passage provided in the flowing fuel gallery for circulating cooling water, a cooling water feed pipe connecting the cooling water outlet of the sub radiator to the cooling water inlet of the gasoline cooler, and the cooling water outlet of the gasoline cooler. And a cooling water return pipe connecting the cooling water inlet of the sub-radiator to An inlet pipe connecting the inlet of the cooling water passage, a valve mechanism for changing the flow direction of the cooling water sent from the gasoline cooler to the inlet pipe and the downstream side of the cooling water return pipe, and the outlet of the cooling water passage. And an outlet pipe connecting the downstream portion of the valve mechanism in the middle of the cooling water return pipe, a pump for circulating cooling water between the sub radiator and the gasoline cooler, and operation and stop of this pump. And a controller that controls switching of the valve mechanism.

(Operation) In the gasoline cooling device of the present invention configured as described above, excess gasoline that is not taken into the sorting means is cooled by exchanging heat with the cooling water in the gasoline cooler. After that, it is returned to the fuel tank.

As a result, the temperature of the gasoline stored in the fuel tank does not rise due to the excess gasoline returned through the return pipe, and it is possible to effectively prevent the diffusion of HC into the atmosphere and the occurrence of vapor lock. .

After the engine is stopped, the cooling water is circulated in the cooling water passage to prevent the temperature of the gasoline remaining in the fuel gallery from rising and to prevent the gasoline in the fuel gallery from vaporizing. , It prevents HC from spreading into the atmosphere and at the same time makes it easy to restart the engine.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

FIG. 1 is a schematic circuit diagram showing an embodiment of the present invention.

13 is a sub radiator, and this sub radiator 13 is a main radiator for radiating cooling water for cooling the gasoline engine 7.
It is provided independently of 15.

16 is a water-cooled gasoline cooler.
The heat exchanger 16 cools the extra gasoline by exchanging heat between the cooling water radiated by the sub radiator 13 and the extra gasoline that is not fed into the cylinder of the gasoline engine 7.

That is, of the gasoline taken out from the fuel tank 1 and sent by the fuel pump 2 to the pressure regulator 6 as a sorting means, the surplus gasoline that is not sent to the fuel gallery 14 is passed through the first return pipe 17 to the above-mentioned gasoline. The fuel tank 1 is sent to the cooler 16 and heat is exchanged with the cooling water in the gasoline cooler 16 to lower the temperature, and then the fuel tank 1 is passed through the second return pipe 18.
I am going to return it to.

On the other hand, in the fuel gallery 14 through which the gasoline taken in by the pressure regulator 6 flows, a cooling water passage for circulating cooling water is provided, and by circulating the cooling water in the cooling water passage, the inside of the fuel gallery 14 is cooled. The temperature of gasoline existing in is reduced.

The cooling water outlet 19 of the sub radiator 13 and the cooling water inlet 20 of the gasoline cooler 16 are electrically driven by a water pump.
They are connected to each other by a cooling water feed pipe 22 provided with 21.

The cooling water outlet 23 of the gasoline cooler 16 and the cooling water inlet 24 of the sub radiator 13 are connected by a cooling water return pipe 25.
Connected to each other.

In the middle of this cooling water return pipe 25, an electric three-way valve 26
Is provided. The cooling water return pipe 25 is connected to two of the three ports provided in the three-way valve 26, and one end of an inlet pipe 27 is connected to the remaining ports. The other end of the inlet pipe 27 is connected to the inlet of the cooling water passage.

An outlet pipe 31 is provided between the outlet of the cooling water passage and a portion of the cooling water return pipe 25 on the downstream side of the three-way valve 26.

28 is the operation and stop of the water supply pump 21, and the three-way valve
It is a controller for controlling switching of 26 and this controller 28
Is a signal representing the temperature of the oil in the gasoline engine 7, a signal representing the number of revolutions of the gasoline engine 7, a signal representing the traveling speed of the vehicle, a signal representing the temperature inside the fuel tank 1, and the temperature of the fuel gallery 14 portion. The signal to represent is input. Then, the controller 28 controls the operation and stop of the water pump 21 and the switching direction of the three-way valve 26 based on the signals.

In FIG. 1, 29 is a canister, and the gasoline vapor generated in the fuel tank 1 is sent to the canister 29 through the check valve 30 and adsorbed on the activated carbon provided in the canister 29. Captured in.

Then, the gasoline vapor adsorbed on the activated carbon is sucked into the cylinder chamber of the gasoline engine 7 due to the negative pressure generated during the operation of the gasoline engine 7, and burns in the cylinder chamber.

In the gasoline cooling device of the present invention configured as described above, while the engine 7 is operating, the water pump 21 is appropriately operated by the signal from the controller 28 and the three-way valve 26 is cooled. The water return pipes 25 are switched to communicate with each other.

Fuel pump 2 along with operation of gasoline engine 7
Is sent to the pressure regulator 6 by the pressure regulator 6 and the fuel gallery 14
Excess gasoline that is not taken into the inside is cooled in the water-cooled gasoline cooler 16 by exchanging heat with cooling water, and then returned to the fuel tank 1.

As a result, the temperature of the gasoline stored in the fuel tank 1 will not rise due to the excess gasoline returned through the first and second return pipes 17 and 18, preventing the diffusion of HC into the atmosphere. It is possible to effectively prevent the occurrence of vapor lock.

After stopping the gasoline engine 7, the controller 28
Based on the signal from the three-way valve 26,
And the inlet pipe 27 are communicated with each other, and the cooling water is circulated in the cooling water passage in the fuel gallery 14.

As a result, the temperature rise of the gasoline remaining in the fuel gallery 14 is prevented, the vaporization of the gasoline in the fuel gallery 14 is suppressed, and HC is prevented from diffusing into the atmosphere at the same time, The restart of the gasoline engine 7 becomes easy.

(Effect of the Invention) Since the gasoline cooling device of the present invention is configured and operates as described above, it is possible to effectively prevent the temperature inside the fuel tank from rising due to excess gasoline returned to the fuel tank. By preventing the temperature of gasoline remaining in the fuel gallery from rising after the engine is stopped, it is possible to prevent HC from diffusing into the atmosphere, prevent vapor lock, and improve engine restartability. , Plays an important role in environmental protection, fuel efficiency improvement, and stable engine operation.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a conventionally known gasoline supply device, and FIG. 3 is a longitudinal section showing an example of a conventional gasoline cooler. It is a figure. 1: Fuel tank, 2: Fuel pump, 3: Fuel damper, 4: Fuel filter, 5: Injector, 6: Pressure regulator, 7: Gasoline engine, 8: Intake manifold, 9: Return pipe, 10: Carburetor, 11: Heat exchanger, 12: Float chamber, 13: Sub radiator, 14: Fuel gallery, 15: Main radiator, 16: Gasoline cooler, 17: First return pipe, 18: Second return pipe, 19: Cooling water outlet , 20: cooling water inlet, 21: water pump, 22: cooling water inlet pipe, 23: cooling water outlet, 24: cooling water inlet, 25: cooling water return pipe, 26: three-way valve, 27: inlet pipe, 28: Controller, 29: canister, 30: check valve, 31: outlet pipe.

Claims (1)

[Scope of utility model registration request] 1. A sub-radiator independent of the main radiator for radiating cooling water for a gasoline engine, and a cooling means for separating the cooling water radiated by the sub-radiator from the gasoline fed into the cylinder of the gasoline engine. By exchanging heat with excess gasoline that is not stored, it is installed in the gasoline cooler that cools this excess gasoline and then returns it to the fuel tank, and in the fuel gallery where the gasoline taken into the sorting means flows, circulating cooling water A cooling water passage that connects the cooling water outlet of the sub radiator to the cooling water inlet of the gasoline cooler, and a cooling water feed pipe that connects the cooling water outlet of the gasoline cooler to the cooling water inlet of the sub radiator A water return pipe, an inlet pipe connecting the middle portion of the cooling water return pipe and the inlet of the cooling water passage, and Of the valve mechanism that changes the flow direction of the cooling water sent from the cooler to the inlet pipe and the downstream side of the cooling water return pipe, and in the middle of the outlet of the cooling water passage and the cooling water return pipe. From the outlet pipe connecting the downstream side portion, the pump for circulating the cooling water between the sub radiator and the gasoline cooler, and the controller for controlling the operation and stop of the pump and the switching of the valve mechanism. Gasoline cooling system consisting of.