KR100367950B1 - Automotive fuel system having controller - Google Patents

Abstract

The fuel system of the motor vehicle of the present invention includes an input unit, a controller, a fuel indicating means, a fuel warning means and a power supply means. The input unit transmits the sender signal of the resistance value output from the fuel sender mounted in the fuel tank to the main signal line. The controller formalizes the sender signal received from the main signal line of the input unit, and outputs the on-response with a fast response for a few seconds when the ignition is turned off and then on again for oiling. The fuel display means receives the control signal of the control means and moves the pointer 20 of the fuel gauge 18. The fuel warning means receives the control signal of the controller means and turns on the fueling warning light 40. The power supply means supplies power to the controller through the first fuel signal line by the on operation of the starter, and supplies power to the fueling warning light through the second fuel signal line. The controller can simultaneously control the indicated angle of the fuel gauge of the fuel system and the timing of turning on the fueling warning light.

Description

Fuel system for automobile with controller {AUTOMOTIVE FUEL SYSTEM HAVING CONTROLLER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel system of a vehicle equipped with a controller, and more particularly, to a fuel system of a vehicle provided with a controller capable of simultaneously controlling a fuel gauge and a fueling warning light.

The fuel system of a conventional vehicle includes a fuel tank 110, a fuel indicating means and a fuel warning means as shown in FIG.

The fuel is filled in the fuel tank 110 and stored.

The fuel indicating means includes a float 112, a fuel sender 114, a first fuel signal line 116 and a fuel gauge 118. The float 112 is mounted in the fuel tank 110 and moves in accordance with the level of fuel. The fuel sender 114 converts and outputs the resistance value according to the displacement of the float 112. The first fuel signal line 116 is connected to one end of the fuel sender 114 so that the resistance value of the fuel sender 114 becomes a moving passage. The fuel gauge 118 is connected to the other end of the first fuel signal line 116 to receive the resistance signal of the fuel sender 114 and inform the driver of the amount of fuel. The fuel gauge 118 includes a dial 120, a pointer shaft 122, a pointer 124, and a bobbin 126. The amount of fuel is displayed on one surface of the dial 120. The pointer shaft 122 penetrates into the dial 120. The pointer 124 is axially coupled to the upper end of the pointer shaft 122. The bobbin 126 accommodates the lower end of the pointer shaft 122. The coil 128 and the magnet 130 are provided on the pointer shaft 122 in the bobbin 126. The magnet 130 is surrounded by a high viscosity damper oil 132.

The fuel warning means includes a thermistor 134, a second fuel signal line 136 and a fueling warning light 138. The thermistor 134 is installed at one side of the fuel sender 114 to output a resistance value. One end of the second fuel signal line 136 is connected to the thermistor 134 to transmit a resistance value. The fueling warning light 138 is connected to the other end of the second fuel signal line 136 to be turned on or off depending on the resistance value output by the thermistor 134. Here, the fuel gauge 118 and the fueling warning light 138 are supplied with power to the starter 140.

A general operating procedure of an automotive fuel system using a conventional cross coil type instrument configured as described above is disclosed. The float 112 displays different resistance values in the fuel sender 114 while floating and sinking in the fuel tank 110 according to the amount of fuel used. The fuel sender 114 outputs the changed resistance value to the fuel gauge 118 by the first fuel signal line 116. In the fuel gauge 118, the resistance value is transmitted to the coil 128 to be magnetized. The magnet 130 rotates the pointer 124 together with the pointer shaft 122 to display the current fuel remaining amount on the dial 120. At this time, the magnet 130 is not easily rotated because it is surrounded by a high viscosity (adhesive level) damper oil 132. The damper oil 132 performs a function of controlling the magnet 130, that is, the pointer 124, to be moved only when the resistance value of the fuel sender 114 is maintained for a predetermined time.

In such a conventional fuel system, a high viscosity damper oil 132 is injected into the bobbin 126 of the fuel gauge 118 to use the following problems.

First, the bobbin 126 of the fuel gauge 118 required expensive equipment in the injection process of the high viscosity damper oil 132.

Second, since the fuel gauge 118 operates the fuel gauge with the same responsiveness after the fuel refilling due to the damper oil 132, the driver spends several minutes checking the fuel oiling state.

Third, when the vehicle is turned off, the pointer 124 of the fuel gauge 118 is positioned at the final position. In order to implement this function normally, the balance of the pointer 124 and the balance of the magnet 130 are realized. , Thorough management of concentricity and other variables was required.

Fourth, since the fuel indicator means and the fuel warning means are controlled in different ways, there is a case where the instruction of the fuel gauge 118 and the lighting timing of the fueling warning light 138 are inconsistent, causing confusion of the driver.

Fifth, the fueling warning light 138 had to adjust the fuel sender 114 mounted in the fuel tank 110 to change its lighting time.

Therefore, the present invention is to solve the above problems, the technical problem of the present invention is that the pointer of the fuel gauge can return to the zero point when the start is stopped, and also the rapid confirmation of the refueling amount within a few seconds when restarting after refueling It is to provide a vehicle fuel system equipped with a possible controller.

Another technical problem of the present invention is to provide an automotive fuel system having a controller capable of simultaneously receiving a sender signal of a fuel and controlling an indication angle of a fuel gauge and a lighting timing of a fueling warning light.

Another technical problem of the present invention is to provide a fuel system of a vehicle equipped with a controller capable of changing the lighting timing of the fuel oil lamp by changing only the reference voltage value of the fuel oil warning lamp.

The present invention relates to a fuel system of an automobile having a fuel gauge and a fuel warning lamp, comprising: a relubrication delay circuit for increasing power of voltage rectification to the fuel gauge for a predetermined time; A general delay circuit for lowering power and an initial operation timer for determining whether the predetermined time has elapsed; a delay circuit for varying the responsiveness according to the instruction operation of the fuel gauge corresponding to the sender signal; A voltage follower (VOLTAGE FOLLOWER) which transmits the voltage output from the delay circuit unit to the fuel gauge and feeds back the voltage change of the fuel gauge. And a comparison unit configured to control the flashing of the fuel warning lamp by comparing the voltage output from the voltage follower with a reference voltage of the fuel warning lamp.

The present invention provides a delay circuit unit comprising: an initial operation timer set to operate a few seconds when the power is cut off and then applied again when refueling; A relubrication delay circuit configured to operate the fuel gauge with a fast response during the setting time of the initial operation timer; And a general delay circuit for deactivating the relubrication delay circuit when the setting time of the initial operation timer elapses and operating the fuel gauge with a slow response.

The present invention is characterized in that the comparator is provided with hysteresis to prevent flickering of the fueling warning light even if the sender signal of the fuel sender is fluctuated at the time of turning on the fueling warning light.

1 is a schematic diagram showing a fuel system of a vehicle of the prior art;

FIG. 2 is an enlarged cross-sectional view illustrating main parts of the cross coil type fuel gauge in FIG.

3 is a system diagram of a fuel system of a motor vehicle equipped with a controller according to an embodiment of the present invention; And

4 is a block diagram of a controller in FIG. 3.

<Explanation of symbols for the main parts of the drawings>

W: input unit C: control unit

10: fuel tank 12: float

14: fuel sender 16: main signal line

18: fuel gauge 20: pointer

22: first fuel signal line 24: second fuel signal line

26: delay circuit 28: initial operation timer

30: relubrication delay circuit 32: general delay circuit

34: voltage follower 36: comparison unit 38: warning light signal line 40: fueling warning light 42: starting device 44: first supply line 46: second supply line

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a system diagram of a fuel system of a vehicle equipped with a controller according to an embodiment of the present invention. 4 is a block diagram of a controller in FIG. 3.

As shown therein, the fuel system of the vehicle equipped with the controller of the present invention includes an input unit W, a controller C, a fuel indicator, a fuel warning means, and a power supply means.

The input unit W is changed with the float 12 according to the fuel level in the fuel tank 10, and the fuel sender 14 sends the sender signal of the resistance value according to the fluctuation of the float 12 to the main signal line 16. Output

The controller C standardizes the sender signal transmitted from the main signal line 16 of the input unit W, outputs an on-response signal for a few seconds when the ignition is turned off and then on again, and then slows down after a few seconds. Outputs an on signal with responsiveness.

The fuel indicator means is provided with a fuel gauge 18 equipped with a pointer 20. The control signal of the controller C moves the pointer 20 of the fuel gauge 18 in accordance with the change in the resistance value.

The fuel gauge 18 is not described in the present invention with respect to the internal structure of the rest except for the pointer 20, and uses the same reference numerals disclosed in FIG. The fuel gauge 18 includes a dial 120, a pointer shaft 122, a pointer 124, and a bobbin 126. The amount of fuel is displayed on one surface of the dial 120. The pointer shaft 122 penetrates into the dial 120. The pointer 124 is axially coupled to the upper end of the pointer shaft 122. The bobbin 126 accommodates the lower end of the pointer shaft 122. The coil 128 and the magnet 130 are provided on the pointer shaft 122 in the bobbin 126. The magnet 130 is surrounded by a damper oil 132.

The fuel warning means receives the control signal of the controller C and turns on the fueling warning light 40.

When the power supply means is supplied with power by the on operation of the starter 42, the output alternating voltage changes the level of the DC voltage, partly supplied to the controller via the first fuel signal line 22, and the other part Supplied to the fueling warning light 40 through the second fuel signal line 24.

The controller C includes a delay circuit 26, a voltage follower 34, and a comparator 36. The delay circuit unit 26 operates the fuel gauge 18 with a fast response after being supplied with voltage rectification when the power is disconnected and then energized again, and later operates the fuel gauge 18 with a slow response. ). The voltage follower (VOLTAGE FOLLOWER) 34 transmits the voltage output from the delay circuit section 26 to the fuel gauge 18 and feeds back the voltage change of the fuel gauge 18. The comparator 36 turns on the fueling warning light 40 when a voltage output from the voltage follower 34 is greater than a reference voltage of the fueling warning light 40. The comparator 36 is provided with hysteresis to prevent flickering of the fueling warning light 40 even when the sender signal of the fuel sender 14 is fluctuated at the time of turning on the fueling warning light 40.

The delay circuit section 26 includes an initial operation timer 28, a relubrication delay circuit 30, and a general delay circuit 32. The initial operation timer 28 is set to operate for a few seconds when the power is cut off and then applied again by the user at the time of refilling. The relubrication delay circuit 30 operates the fuel gauge 18 with fast response during the setting time of the initial operation timer 28. The general delay circuit 32 deactivates the relubrication delay circuit 30 when the setting time of the initial operation timer 28 elapses, and operates the fuel gauge 18 with a slow response.

The fuel system of the present invention protects the entire controller C of the fuel gauge and the fuel warning lamp 40 by turning off the power when a reverse voltage is applied, whereas the fuel gauge 18 and The fueling warning light 40 can be operated.

Based on the controller C provided in the present invention simultaneously controlling the fuel gauge 18 and the fueling warning light 40, a detailed operation description of the present invention is as follows.

When driving a vehicle, the fuel remaining amount in the fuel tank 10 decreases with time. In this process, the float 12 located in the fuel tank 10 is lowered together as the fuel level is lowered. Variation of the float 12 changes the resistance value of the fuel sender 14. The fuel sender 14 outputs a sender signal according to a change in the resistance value. The sender signal is input to the controller C via the main signal line 16. In response, the controller C formats the received sender signal.

The standardized sender signal is input to the fuel gauge 18 through the first fuel signal line 22 and the second fuel signal line 24. In the fuel gauge 18, the angle of the pointer 20 is changed by the input sender signal. In this case, the fuel remaining amount is displayed as being at a dangerous level. In addition, the standardized sender signal is transmitted to the fueling warning light 40 through the warning light signal line 38 and turned on.

Thus, the driver is to be oiled in the state that stopped the start of the car. When starting stops, the pointer 20 of the fuel gauge 18 returns to zero within a few seconds. After refueling, the driver turns on the starting device 42 of the vehicle. The on signal is input to the controller C. In the controller C, as shown in FIG.

That is, when the starter 42 is turned on, the on signal is input into the controller C to start the initial operation timer 28 of the delay circuit section 26. The initial operation timer 28 is set to start for only a few seconds in advance. In this way, the initial operation timer 28 is operated, and at this time, the high voltage rectified power is transferred to the relubrication delay circuit 30 of the delay circuit unit 26. The high voltage voltage rectifying power source induces a quick response of the relubrication delay circuit 30, and the pointer 20 of the fuel gauge 18 is moved at an angle corresponding to the current fuel amount. Thus, the driver can visually check the current fuel amount at the same time as the on-operation of the starter 42 after refueling.

The initial operation timer 28 deactivates the relubrication delay circuit 30 when the setting time has elapsed and the voltage rectified power is supplied to the general delay circuit 32 at a low voltage to induce a slow response of the fuel gauge. . As a result of this, the re-lubrication delay circuit 30 is for quickly checking the fueling state in the stopped state after refueling, while the general delay circuit 32 is a circuit operated during driving of the vehicle. In other words, as the resistance value of the fuel sender 14 is maintained for a predetermined time during driving of the vehicle, the pointer 20 of the fuel gauge 18 is moved to check the current fuel remaining amount.

The voltage output to the fuel gauge 18 causes its target value to change at any time. Accordingly, the voltage follower 34 feedbacks the output voltage of the fuel gauge 18 to the comparator 36 so as to follow any temporal change in reflection. The comparison unit 36 compares the reference voltage of the fueling warning light 40 with the output voltage of the voltage follower 34, so that the fueling warning light when the output voltage of the voltage follower 34 is larger than the reference voltage of the fueling warning light 40. The 40 is turned on.

When the hysteresis is applied to the comparator 36, the hysteresis can prevent the oiling warning light 40 from flickering even if the sender signal of the fuel sender 14 is fluctuated at the time of turning on the fueling warning light 40.

According to the fuel system of the vehicle equipped with the controller of the present invention as described in detail above, in the present invention, by using a low viscosity damper oil in the fuel gauge, the hysteresis of the fuel gauge itself is reduced, so that the difference in the indicated angle is remarkably. It also reduces the cost and eliminates the need for expensive high viscosity damper oil injectors in production lines.

In the present invention, since the pointer of the fuel gauge returns to zero when starting is stopped, the balance of the pointer, the perpendicularity of the pointer and the assembly, the concentricity and the balance of the magnet, etc. can be extensively managed, and the relubrication delay when restarting after refueling is performed. The circuit allows quick confirmation of refill flow in seconds.

According to the present invention, it is convenient to receive the sender signal of the fuel and simultaneously control the indication angle of the fuel gauge and the lighting timing of the fueling warning lamp.

In the present invention, instead of changing the fuel sender in the fuel tank, it is possible to change the lighting timing of the fuel oil lamp by changing only the reference voltage value of the fuel oil warning lamp.

Although the present invention has been described in detail only with respect to the embodiments described above, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the present invention. It should be limited by the claims.

Claims (4)

In a fuel system of an automobile having a fuel gauge and a fuel warning light, Fuel sender; In response to the sender signal of the fuel sender, a re-lubrication delay circuit for increasing the voltage rectification power to the fuel gauge for a predetermined time through the initial operation timer when the vehicle is started, and after a predetermined time has elapsed from the initial operation timer A delay circuit section including a general delay circuit for lowering the power of the voltage rectification with the fuel gauge; A voltage follower (VOLTAGE FOLLOWER) which transmits the voltage output from the delay circuit unit to the fuel gauge and feeds back the voltage change of the fuel gauge. And And a comparator configured to control the flashing of the fuel warning light by comparing the voltage output from the voltage follower with a reference voltage of the fuel warning light. delete delete The vehicle fuel system of claim 1, wherein the reference voltage of the comparator comprises a hysteresis section.