KR101746439B1 - System and Method for Preventing Fuel Freezing of Diesel Vehicle - Google Patents

Abstract

The present invention relates to a fuel freeze prevention system and a fuel freeze prevention method for a diesel vehicle, and more particularly, to a fuel freeze prevention system and a fuel freeze prevention method of a diesel vehicle capable of preventing freezing of fuel exposed to the outside of a vehicle without using a heater system The present invention relates to a fuel freezing prevention system and a method thereof.
More specifically, according to the present invention, it is determined whether or not the engine stop time exceeds 8 hours (h), whether the outside air temperature is less than -10 ° C, and whether the battery voltage is 22 V or more An ECU (Electric Control Unit) for driving the engine for 10 minutes to prevent the fuel from freezing, a sensor for sensing the engine stop time, the outside temperature and the engine driving time and providing the sensor to the ECU ); And an ECU activation button for forcibly supplying power to the ECU (Electric Control Unit) even when the vehicle is turned off.

Description

TECHNICAL FIELD [0001] The present invention relates to a fuel freezing prevention system and a fuel freezing prevention method for a diesel vehicle,

The present invention relates to a fuel freeze prevention system and a fuel freeze prevention method for a diesel vehicle, and more particularly, to a fuel freeze prevention system and a fuel freeze prevention method of a diesel vehicle capable of preventing freezing of fuel exposed to the outside of a vehicle without using a heater system The present invention relates to a fuel freezing prevention system and a method thereof.

Generally, diesel engines have advantages such as low fuel cost and high efficiency, and are widely applied in various fields such as a ship and a vehicle. The diesel engine improves the fuel injection method and the engine rotation method to improve the output performance and reduce the soot Have been steadily improving, and the scope and subject of the application has been increasing.

In addition, diesel oil used as a fuel for diesel engines contains a large amount of impurities and moisture. Therefore, a filtering process is required to remove the impurities and water, and a fuel filter is used for filtering.

That is, the fuel is supplied from the fuel tank to the fuel filter to remove the impurities, and then the diesel fuel is injected into the engine by the injector through the fuel pump and the common rail. By supplying pure diesel fuel through the fuel filter to the engine as described above, it is possible to prevent damage and failure of the engine due to impurities in advance, and complete combustion can be performed due to the vaporization of pure fuel only, so that the emission of exhaust gas by incomplete combustion It is possible to reduce environmental pollution caused by exhaust gas to a minimum.

However, paraffin is one of the impurities contained in the fuel due to the characteristics of the diesel fuel. The paraffin is an additive which is required to be contained in the diesel fuel because of excellent ignition performance and high calorific value. Such paraffin is liquid at normal temperature, It has a property of solidifying in the form of wax (WAX).

Particularly, when the temperature falls in winter, the viscosity of the paraffin contained in the fuel increases to solidify on the filter cartridge, the flow of the fuel supplied to the fuel filter decreases, the fuel supply becomes unstable, There are many problems such as the exhaustion of the exhaust gas, excessive generation of white smoke, insufficient output during running of the vehicle, poor acceleration, and the like.

Therefore, the present fuel filter is provided with a heating system separately provided for lowering the viscosity of the solidified diesel fuel to enable smooth fuel supply. However, the weight of the vehicle itself increases with the addition of such a separate system, There is a problem that the cost increases.

In addition, the heating system only instantaneously heats the local area, so that the efficiency of lowering the viscosity of the solidified fuel is not good, and the fuel tank, the fuel filter and the pipe connecting them are located outside the vehicle, It is impossible to prevent the solidification of the fuel remaining in the fuel system by heating only and thus the fuel freezing can not be prevented completely.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a fuel freeze prevention system and a fuel freeze prevention method which can prevent freezing of fuel in a cold state without using a separate heater system The purpose is to provide.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the description of the present invention .

According to an aspect of the present invention, there is provided a diesel vehicle including: an engine stopping time exceeding 8 hours (h); an outside temperature of -10 ° C or less; and a battery voltage An ECU (Electric Control Unit) for automatically determining whether the engine is at least 22V, and for automatically driving the engine for 10 minutes to prevent freezing of fuel, and a control unit for sensing the engine stop time, And an ECU activation button for forcibly supplying power to the ECU (Electric Control Unit) even if the vehicle is turned off. The present invention also provides a fuel freeze prevention system for a diesel vehicle, .

Preferably, the present invention further includes a safety switch for turning off the ECU activation button when the state is ON, thereby preventing the vehicle from being started up.

In the present invention, when the ECU activation button is turned ON, when the gear of the vehicle is not positioned in neutral (N) or when the parking brake is OFF, And a buzzer alarm unit for warning the buzzer.

According to another aspect of the present invention, there is provided a method for controlling an electronic control unit (ECU) comprising: (a) turning on an ECU activation button to supply power to an ECU; (b) determining whether the engine stop time exceeds 8 hours (h) by the ECU and whether the outside air temperature is lower than -10 占 폚; (c) starting the vehicle by the ECU and determining whether the battery voltage of the vehicle exceeds 22V; (d) driving the engine and the preheating heater by turning off the vehicle by the ECU and turning it on again; And (e) determining whether the engine driving time of the vehicle exceeds 10 minutes by the ECU and stopping the engine.

The present invention is characterized in that, after the step (a), (a1) whether or not the gear of the vehicle is located in neutral (N) by the ECU, whether the parking brake is ON And (a2) determining whether or not the safety switch enabling the vehicle start by the ECU is turned off.

According to the present invention, it is possible to provide a fuel freezing prevention system and a fuel freezing prevention method that can prevent fuel freezing in a cold state without using a separate heater system (Heater System).

Further, according to the present invention, since the fuel freezing prevention system is automatically operated by the ECU by only the operation of the ECU activation button, the convenience of the user is increased.

1 is a block diagram of a fuel freezing prevention system for a diesel vehicle according to an embodiment of the present invention;
Fig. 2 is an exemplary view showing a wax produced in a diesel vehicle. Fig.
Fig. 3 is an example showing the influence of wax generated in a diesel vehicle on a fuel filter. Fig.
4 is a flowchart of a method for preventing freezing of fuel in a diesel vehicle according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

The present invention relates to a system and a method for preventing freezing of fuel under a predetermined fuel solidification condition, and more particularly, to a system and method for preventing freezing of fuel under predetermined fuel solidification conditions, The fuel is circulated in the engine-idle state for a predetermined period of time and the temperature of the fuel is increased through the preheating heater, thereby preventing the fuel from being frozen.

1 is a block diagram of a fuel freezing prevention system for a diesel vehicle according to an embodiment of the present invention.

According to the fuel freezing prevention system of the diesel vehicle of the present invention, it is determined whether the engine stop time exceeds 8 hours (h), whether the outside air temperature is lower than -10 ° C, and whether the battery voltage is higher than 22 V, An ECU (Electric Control Unit) 100 for driving the engine for 10 minutes to prevent freezing of fuel, a sensor (not shown) for sensing the engine stop time, the outside temperature and the engine driving time, and an ECU activation button (ECU Wake Up Button) 110 for forcibly supplying power to the ECU (Electric Control Unit) even when the vehicle is turned off.

The ECU activation button 110 performs a function of forcibly supplying power to the ECU 100 so that the ECU 100 can be driven even if the vehicle is turned off. This is because, when a vehicle is turned off, the power of the ECU 100 is turned off at the same time, so that it is impossible to detect the state of the vehicle. Therefore, even when the vehicle is turned off, So that the ECU 100 can be forcedly driven.

Therefore, when the ECU activation button 110 is turned on by a user or by operation of a remote control key or the like, the ECU 100 can be automatically driven when a predetermined fuel solidification condition is met Environment can be created. That is, when the ECU activation button 110 is turned on, it can be said that the ECU 100 is in the stand-by mode.

The ECU (Electric Control Unit) 100 enters the standby mode (Stand-By Mode) by the ECU activation button 110 and then determines whether or not it corresponds to the fuel solidification condition, and drives the engine for a predetermined time .

That is, the sensor 160 may include a temperature sensor (not shown) for measuring the temperature outside the vehicle, and an engine detection sensor (not shown) for detecting the engine stop time and the engine driving time. And provides the ECU 100 with the outside temperature and the engine stop time measured by the ECU 160.

The ECU 100 starts the vehicle when the engine stop time exceeds 8 hours (h) based on the measured outside temperature and the engine stop time and the outside air temperature is lower than -10 ° C. After the determination, it takes about 10 minutes of engine-idle time to stop the engine.

As described above, the ECU 100 causes the vehicle to enter the engine-idle state for a predetermined period of time, thereby circulating the fuel and raising the temperature of the fuel through the preheating heater, thereby preventing the fuel from freezing.

According to the present invention, when the ECU activation button is turned on, when the gear of the vehicle is not located in neutral (N) or when the parking brake is turned off, And a buzzer alarm unit 140 for alarming the user.

This is to judge a condition in which the vehicle will not move when the vehicle is started by the ECU 100, and to inform the user when the vehicle is in a state where the vehicle can move, so as to secure the stability of the vehicle.

In addition, the present invention may include a safety switch 120 for turning off the ECU activation button to prevent the vehicle from being started if the state is ON.

The safety switch 120 prevents a danger that may occur when a mechanic or a third person observes the engine for state inspection or maintenance of the engine in a state in which the ECU activation button 110 is turned ON It can be said that it is installed for. That is, when the safety switch 120 is turned off, the ECU 100 can be driven by the ECU activation button 110 to drive the engine. However, when the safety switch 120 is turned on, The operation of the button 110 is cut off.

The safety switch 120 may be installed in a rear flap door for a bus or a front panel flap or a tilt switch for a truck.

FIG. 2 is an exemplary view showing the wax generated in the diesel vehicle, and FIG. 3 is an example showing the effect of the wax generated in the diesel vehicle on the fuel filter.

The fuel supply system applied to a commercial vehicle and the like is mainly installed outside the vehicle, so that the fuel tank, the fuel filter, and the respective lines are all located directly in contact with the outside atmosphere.

As shown in FIG. 2, the diesel fuel mixed with paraffin easily coagulates in the form of wax (WAX) in a cold season such as winter. Especially, in the fuel filter for removing the impurities contained in the diesel fuel, There has been a problem that it frequently occurs.

Referring to FIG. 3, the wax component prevents the fuel from being supplied to the engine due to the increase in the fuel pressure during running of the vehicle, resulting in a lack of output during running or a start-off phenomenon . That is, the present invention has been devised to solve the existing problems such that the flow of fuel is lowered, the supply of fuel becomes unstable, and the running performance of the vehicle becomes poor.

4 is a flowchart of a method for preventing fuel freezing in a diesel vehicle according to an embodiment of the present invention.

First, the ECU activating button is turned on so that power can be supplied to the ECU (S41). The ECU activation button can be turned on by the user, and if necessary, the ECU activation button can be also turned on by short distance communication using a remote control key or the like.

Next, in step S42, it is determined whether or not the gear of the vehicle is located in neutral (N) by the ECU and whether a parking brake is turned on (S42). In this case, when the fuel freezing method according to the present invention is performed, it is determined whether the vehicle is in a movable state. If the gear of the vehicle is not in the neutral position or the parking brake is OFF, This is to ensure stability.

Subsequently, if there is no problem in the gear or the parking brake of the vehicle, the ECU performs a step of determining whether the safety switch enabling the vehicle start is OFF (S43).

That is, if the safety switch is ON, the ECU activation button is forcibly interrupted to prevent the engine from being automatically started. Such a safety switch is intended to ensure the stability of the mechanic during maintenance of the vehicle.

If the safety switch is OFF, the ECU enters the standby mode, and the ECU determines whether the engine stop time exceeds 8 hours (h) and whether the outdoor temperature is lower than -10 DEG C (S44). That is, the ECU checks the outside air temperature and the engine stop time measured in real time by the sensor to determine whether the fuel solidification condition is satisfied.

Subsequently, the ECU automatically starts the vehicle (S45), and determines whether the battery voltage of the vehicle exceeds 22V (S46). If the battery voltage is less than 22V, if the system is continuously operated, the battery is discharged, and the ECU is forcibly turned off at this time.

If the battery voltage exceeds 22V, the ECU starts the preheating heater by turning the vehicle on and off (S47).

This is for the operation of the preheater according to the atmospheric temperature, because if the preheater is not operated, white smoke (unburned white smoke) is generated.

In order to prevent this, the electric preheating heater is installed in front of the intake manifold to prevent the temperature of the air supplied to the engine from being instantaneously increased And the combustion reaction in the combustion chamber is assisted. That is, when the engine is started in a conventional diesel vehicle, the ECU senses the coolant temperature and operates the preheat heater when the temperature is below -3 ° C.

Therefore, if the vehicle's ignition key is turned off and then turned on as in the present invention, the preheating system will operate, and the white smoke will be generated during the warming up time for removing the wax of the fuel filter. There is an effect that can be prevented.

In addition, the operation of the preheater heater (S47) turns on the engine after the engine is turned off (S48).

After the engine is driven, it is determined whether the engine driving time of the vehicle exceeds 10 minutes by the ECU and the engine is stopped (S49, S50) The prevention method is terminated.

To sum up, in the fuel freezing prevention method of the present invention, the ECU, which is supplied with power by the ECU activation button, drives the engine for 10 minutes in consideration of the positions of gears and parking brakes, safety switches, fuel solidification conditions, The fuel can be rotated and the fuel temperature can be raised to finally prevent wax (WAX) from starting and output from being lowered.

Although the present invention has been described in connection with the specific embodiments of the present invention, it is to be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Various modifications and variations are possible.

100: ECU
110: Activating the ECU
120: Safety switch
130: engine
140: buzzer alarm section
150: Battery
160: Sensor
170: gear
180: Parking brake

Claims (5)

In diesel vehicles,
Whether the engine stopping time corresponding to the fuel solidification condition exceeds 8 hours (h), whether the outside air temperature is lower than -10 ° C or not, and whether the battery voltage is higher than 22V are determined to prevent fuel freezing of the diesel vehicle An ECU (Electric Control Unit) that automatically drives the engine for 10 minutes to prevent fuel freezing;
A sensor for sensing the fuel solidification condition and providing the sensor to the ECU (Electric Control Unit); And
An ECU activation button for forcibly supplying power to the ECU (Electric Control Unit) to prevent fuel solidification even if the vehicle is turned off;
A safety switch for turning off the ECU activation button when the ECU activation button is on, thereby preventing the vehicle from being started up; And
When the ECU activation button is turned ON, when the gear of the vehicle is not positioned in neutral (N) or when the parking brake is OFF, the buzzer sounds to warn the user And a buzzer alarm unit for detecting the freezing of the fuel.
delete delete (a) turning on an ECU activation button so that power can be supplied to an ECU (Electric Control Unit) to prevent fuel freezing of the diesel vehicle;
(b) determining whether the engine stop time corresponding to the fuel solidification condition exceeds 8 hours (h) by the ECU and whether the outdoor temperature is lower than -10 占 폚;
(c) starting the vehicle by the ECU and determining whether the battery voltage of the vehicle exceeds 22V;
(d) driving the engine and the preheating heater to turn off the vehicle by the ECU and then turn it on again to prevent the fuel solidification; And
(e) stopping the engine by determining whether the engine driving time of the vehicle exceeds 10 minutes by the ECU;
Wherein the fuel is a fuel.
5. The method of claim 4, wherein after the step (a)
(a1) judging whether or not the gear of the vehicle is located in neutral (N) by the ECU and whether or not a parking brake is ON; And
(a2) judging whether or not the safety switch enabling the vehicle start by the ECU is off (OFF);
Further comprising the steps of:

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