KR101724864B1

KR101724864B1 - System and method for feedback control of heater of fuel filter

Info

Publication number: KR101724864B1
Application number: KR1020150083596A
Authority: KR
Inventors: 장화용
Original assignee: 현대자동차주식회사
Priority date: 2015-06-12
Filing date: 2015-06-12
Publication date: 2017-04-10
Also published as: KR20160147189A

Abstract

A heater feedback control system for a fuel filter according to the present invention is a heater feedback control system for a fuel filter that responds to a failure in a fuel filter heater of a diesel engine, comprising: an ECU; A temperature sensor for measuring the temperature of the fuel filtered in the fuel filter and transmitting the measured temperature to the ECU; A main relay receiving an operation command or a stop command from the ECU; A main heater that is operated or stopped by the main relay and heats the fuel filter; An integrated feedback unit for compensating for a failure in the main relay and the main heater; A first electric wire connecting the ECU and the main relay; And a second electric wire connecting the auxiliary controller and the main relay, wherein the ECU transmits an operation signal or a stop signal to the main relay through the auxiliary controller and the second electric wire when the first electric wire is disconnected .

Description

FIELD OF THE INVENTION The present invention relates to a feedback control system for a fuel filter,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system and a method for controlling a heater feedback for a fuel filter, and more particularly to a system and method for controlling a heater feedback control system for a fuel filter that can induce a repair, And methods.

The diesel vehicle is equipped with a fuel filter to remove foreign matter from the fuel stored in the fuel tank to the engine. Such a fuel filter not only serves to remove foreign matter but also has a role of heating the cold fuel to facilitate burning more easily.

Particularly in winter, there is a problem that the fuel flow in the fuel supply line is not smooth because the water present in the fuel tank freezes or condensation occurs. In addition, corrosion of the fuel line may occur due to moisture.

Further, when the temperature is further lowered, the wax component contained in the diesel precipitates and the viscosity increases rapidly.

If the flow of fuel stops, the driving of the vehicle becomes impossible, and in the worst case, the engine itself may be damaged, and a great deal of repair costs may be incurred.

Therefore, it is very important to detect the failure of the heater mounted on the fuel filter, and it is also important to determine exactly where such a failure occurred. Accordingly, there is a need for a feedback control system and a control method for precisely grasping the failure of the fuel filter heater and taking temporary measures until it is repaired while minimizing the burden on each component.

A heater for a fuel filter is disclosed in a conventional "fuel filter heating apparatus for a diesel engine (Korean Patent Laid-Open Publication No. 10-2012-0136943 (2012.12.20)) ".

The present invention relates to a fuel cell system including a heater installed in a fuel filter, a fuel temperature sensor installed in a fuel filter for sensing a temperature of fuel, and an outside temperature sensor for sensing a temperature outside the vehicle, Thereby preventing clogging of the fuel filter.

However, according to the present invention, the fuel filter can be heated according to the external temperature to increase the temperature of the fuel. However, there is a limit in not disclosing a method or structure for coping with a failure of the fuel filter heater.

Korean Patent Publication No. 10-2012-0136943 (2012.12.20)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fuel filter for a fuel filter capable of temporarily alleviating a problem caused by a failure of a heater for a fuel filter, And to provide a heater feedback control system and method.

According to an aspect of the present invention, there is provided a heater feedback control system for a fuel filter that responds to a failure in a fuel filter heater of a diesel engine, the system comprising: an ECU; A temperature sensor for measuring the temperature of the fuel filtered in the fuel filter and transmitting the measured temperature to the ECU; A main relay receiving an operation command or a stop command from the ECU; A main heater that is operated or stopped by the main relay and heats the fuel filter; An integrated feedback unit for compensating for a failure in the main relay and the main heater; A first electric wire connecting the ECU and the main relay; And a second electric wire connecting the auxiliary controller and the main relay, wherein the ECU transmits an operation signal or a stop signal to the main relay through the auxiliary controller and the second electric wire when the first electric wire is disconnected .

Wherein the integrated feedback unit includes a sub heater separately provided from the main heater and the ECU transmits an operation signal to the sub relay when the temperature of the fuel measured by the temperature sensor does not rise even if an operation signal is transmitted to the main heater And the sub heater is operated to heat the fuel filter.

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If the fuel temperature measured by the temperature sensor does not rise even if the ECU transmits an operation signal to the main relay or if the fuel temperature measured by the temperature sensor continues to flow even if the ECU transmits a stop signal to the main relay It is determined that a failure has occurred.

A heater feedback control method for a fuel filter according to an embodiment of the present invention is a heater feedback control method for a fuel filter that responds to a failure in a fuel filter heater of a diesel engine, ; Operating the heater when the fuel filter needs to be heated; Determining whether a disconnection has occurred between the relay and the ECU during the step of operating the heater; Transmitting an operation or stop command from the ECU to the relay via a sub-controller when a disconnection occurs; Measuring a change in the fuel temperature after operating the heater; And determining that the fuel temperature change is less than a reference value.

Not operating the heater when the fuel filter does not require heating; Measuring a change amount of the fuel temperature when the heater is not operated; And determining that a failure occurs when the amount of fuel temperature change exceeds a reference value.

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Determining whether the main heater has failed at the time of heater control; And transmitting an operation command or a stop command to the sub heater when the main heater fails.

According to the heater feedback control system and method for a fuel filter according to the present invention, the following effects can be obtained.

First, it is possible to promptly repair a faulty portion by quickly detecting whether or not the heater for the fuel filter is faulty.

Second, even if the heater for the fuel filter fails, it can be prevented from falling into a running state and moved for repair.

Third, it is possible to prevent other components from failing due to failure of the heater for the fuel filter.

1 is a configuration diagram according to an embodiment of the present invention,
FIG. 2 is a flowchart of a failure diagnosis according to the first embodiment of the present invention,
3 is a flowchart illustrating a failure diagnosis according to a second embodiment of the present invention,
4 is a flowchart of a failure diagnosis according to a third embodiment of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, a heater feedback control system and method for a fuel filter according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the present invention is a heater feedback control system for a fuel filter that responds to a failure in a fuel filter heater of a diesel engine. The ECU 300 measures the temperature of the fuel filtered in the fuel filter 100 A temperature sensor 310 to be transmitted to the ECU 300, a main relay 211 and a main relay 211 which are operated or stopped by the main relay 211 and the main relay 211 which receive an operation command or a stop command from the ECU 300, The main relay 210, the main relay 210, and the main heater 210 to compensate for a failure.

The integrated feedback unit includes a sub heater 220, an auxiliary controller 320 and a second electric wire 420 and may include only a sub heater 220 or may include only an auxiliary controller 320 and a second electric wire 420 It is possible.

The sub heater 220 is configured to heat the fuel filter 100 instead of the main heater 210 when the main heater 210 fails. The sub heater 220 is smaller than the main heater 210 and minimizes the installation volume. However, since the size is small, the heating performance may be insufficient as compared with the main heater 210. The sub heater 220 does not replace the main heater 210 completely but assists the vehicle to move to the repair shop by the magnetic force when the main heater 210 fails. That is, if the fluidity of the fuel is lost when the main heater 210 fails, it may lead to driving of the vehicle as well as damage of the engine.

At this time, it is preferable to induce the repair while notifying the abnormality of the main heater 210 by a display means (not shown).

The auxiliary controller 320 and the second electric wire 420 are configured to replace the first electric wire 410 when a problem occurs in the first electric wire 410 connecting between the ECU 300 and the main relay 211. [ That is, when the ECU 300 transmits an operation signal or a stop signal to the main relay 211, if the first wire 410 is disconnected, the ECU transmits an operation signal or a stop signal to the separately installed auxiliary controller 320 And the auxiliary controller 320 transmits an operation signal or a stop signal to the main relay 211 through the second electric wire 420.

In addition, it is preferable that the second wire 420 is connected to the sub relay 221 in addition to the main relay 211 so as to transmit signals. This is because, if the main heater 210 and the first wire 410 fail simultaneously, the auxiliary heater 320 must operate the sub heater 220.

At this time, it is preferable to induce the repair by informing the display means not shown of the abnormality of the first wire 410.

Further, the present invention is a heater feedback control method for a fuel filter to cope with a failure in a fuel filter heater of a diesel engine.

2, it is determined whether or not the ECU needs to heat the fuel filter after start-up, a step of operating the heater when the fuel filter needs to be heated, a step of changing the amount of change in the fuel temperature And determining that the fuel temperature change is less than the reference value.

That is, when the temperature of the fuel does not rise despite the fact that the fuel filter needs to be heated to operate the main heater, the main relay can not transmit the signal, the first electric wire is broken, the main heater is broken It is determined that a problem has occurred.

At this time, it is preferable to identify the cause of each failure by using a sensor for detecting the disconnection and notify the driver of the failure site. Such a configuration is conventionally known in various manners, so a detailed description thereof will be omitted here.

When the fuel filter does not require heating, the step of not operating the heater, the step of measuring the amount of change of the fuel temperature at the time of non-operation of the heater, and the step of determining that the failure is judged when the amount of change of the fuel temperature exceeds the reference value .

That is, if the temperature of the fuel rises despite the fact that the main heater is not operated, it can be predicted that the main relay is in a state of failure fixed to the ON state.

3 and 4, if it is determined that the first wire between the main relay and the ECU has been disconnected and it is determined that a disconnection has occurred, the ECU sends the control signal to the main relay through the second wire via the second controller And transmitting an operation or stop command.

In this case, although repair is not urgent, if the second electric wire is broken, further control of the main heater becomes impossible. Therefore, it is desirable to display a fault on the display to induce repair.

Finally, it may further include determining whether the main heater is faulty and transmitting an operation command or a stop command to the sub heater.

If it detects that the main heater has failed, it is preferable to operate the sub heater which is lower than the main heater but capable of heating the fuel to preheat the fuel and induce the repair while notifying the failure of the main heater. In this case, the output of the vehicle may be limited in consideration of the fact that the heating of the fuel is not smooth.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention .

1: Engine 2: Fuel tank
100: fuel filter 110: fuel supply line
210: main heater 211: main relay
220: Sub heater 221: Sub relay
300: ECU 310: temperature sensor
320: auxiliary controller 410: first wire
420: 2nd wire

Claims

A heater feedback control system for a fuel filter that responds to a failure in a fuel filter heater of a diesel engine,
ECU;
Auxiliary controller;
A temperature sensor for measuring the temperature of the fuel filtered in the fuel filter and transmitting the measured temperature to the ECU;
A main relay receiving an operation command or a stop command from the ECU;
A main heater that is operated or stopped by the main relay and heats the fuel filter;
An integrated feedback unit for compensating for a failure in the main relay and the main heater;
A first electric wire connecting the ECU and the main relay; And
And a second electric wire connecting the auxiliary controller and the main relay,
Wherein the ECU transmits an operation signal or a stop signal to the main relay via the auxiliary controller and the second electric wire when a disconnection occurs in the first electric wire.

The method according to claim 1,
Wherein the integrated feedback unit includes a sub heater separately provided from the main heater,
The ECU transmits an operation signal to the sub relay when the temperature of the fuel measured by the temperature sensor does not rise even if an operation signal is transmitted to the main heater, and the sub heater is operated to heat the fuel filter The feedback control system for the fuel filter.

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The method according to claim 1,
If the fuel temperature measured by the temperature sensor does not rise even if the ECU transmits an operation signal to the main relay or if the fuel temperature measured by the temperature sensor continues to flow even if the ECU transmits a stop signal to the main relay And determines that a failure has occurred when the fuel filter is turned up.

A heater feedback control method for a fuel filter that responds to a failure in a fuel filter heater of a diesel engine,
Determining whether the ECU needs to heat the fuel filter after startup;
Operating the heater when the fuel filter needs to be heated;
Determining whether a disconnection has occurred between the relay and the ECU during the step of operating the heater;
Transmitting an operation or stop command from the ECU to the relay via a sub-controller when a disconnection occurs;
Measuring a change in the fuel temperature after operating the heater; And
And determining that the fuel temperature change is less than a reference value.

The method of claim 5,
Not operating the heater when the fuel filter does not require heating;
Measuring a change amount of the fuel temperature when the heater is not operated; And
And determining that the fuel temperature change is a failure when the fuel temperature change amount exceeds a reference value.

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The method of claim 5,
Determining whether the main heater has failed at the time of heater control; And
And transmitting an operation command or a stop command to the sub heater when the main heater fails.