• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank level warning device for a vehicle. In particular, a warning signal can be issued when a residual fuel level in a fuel tank becomes lower than a predetermined level by using a pressure change of the fuel tank simultaneously with a level warning using a fuel level gauge. Fuel tank level warning device. The present invention relates to a fuel tank level warning device connected to a canister, a buffer solenoid valve, and a purge control system including a canister close valve, the tank pressure sensor being installed in the fuel tank to detect the pressure of the boil-off gas in the fuel tank. And a fuel recharge warning signal when the tank pressure change before / after closing all the valves of the purge control system discharged from the tank when the pressure inside the fuel tank is stable and the engine is in the idle state is smaller than a predetermined set value. Control means for generating a, characterized in that consisting of a warning light that is lit in accordance with the warning signal.
    公开号:KR19980044700A
    申请号:KR1019960062818
    申请日:1996-12-07
    公开日:1998-09-05
    发明作者:이승우
    申请人:김영귀；기아자동차 주식회사；
    IPC主号:
    专利说明:

    Fuel tank level warning device
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank level warning device for a vehicle. In particular, a warning signal can be issued when a residual fuel level in a fuel tank becomes lower than a predetermined level by using a pressure change of the fuel tank simultaneously with a level warning using a fuel level gauge. Fuel tank level warning device.
    In general, the fuel tank that stores the fuel of the vehicle is equipped with a fuel level gauge to display the remaining fuel remaining in the fuel tank in the meter set installed on the dashboard.
    In more detail, the conventional fuel tank level display device displays the fuel level by converting its position into an electrical signal and sending it to the meter set as the float of the gauge installed in the fuel tank descends, and when it falls below the set level, a warning lamp Lights up to refuel the fuel.
    However, in such a prior art, if the fuel level gauge itself is bad or the wire harness between the tank and the meter set has a problem, there is a possibility that the engine is turned off and the vehicle is not restarted and the vehicle is in great danger because there is no information on the fuel residue.
    Accordingly, the present invention has been made in view of the problems of the prior art, and its purpose is to provide a warning signal when the remaining fuel amount in the fuel tank is lower than a predetermined level by using the pressure change of the fuel tank at the same time as the level warning using the fuel level gauge. To provide a vehicle fuel tank level warning device that can emit.
    Another object of the present invention is to provide a dual fuel tank level warning device.
    1 is a circuit diagram of a fuel tank level warning device according to the present invention;
    FIG. 2 is a control flowchart of the fuel tank level warning device shown in FIG. 1.
    * Description of the symbols for the main parts of the drawings *
    One; Fuel tank 3; Tank pressure sensor
    5; Control unit 7; Canister
    9; Purge solenoid valve 11; Surge Tank
    13; Canister close valve 15; Fuel level gauge
    17; Float 19; Meter set
    21; Warning light TR; Output transistor
    In order to achieve the above object, the present invention provides a fuel tank level warning device connected to a canister, a purge solenoid valve, and a purge control system including a canister close valve. The tank pressure sensor for detecting the pressure and the tank pressure change value before and after closing all the valves of the purge control system discharged from the tank when the engine is in the idle state as the pressure inside the fuel tank is stable are set. Provided is a vehicle fuel tank level warning device comprising a control means for generating a fuel refill warning signal when the value is smaller than the value, and a warning light that is turned on according to the warning signal.
    The fuel tank further includes a fuel level gauge installed in the fuel tank for generating an electrical signal for the remaining fuel amount, and a meter set for displaying the residual fuel level according to the electrical signal. The warning light outputs the meter set and the control means. It is characterized in that connected in parallel.
    In the present invention as described above, the pressure change value of the fuel boil-off gas in the tank changes differently according to the remaining amount in the fuel tank, and when the pressure change value is lower than the reference value, a fuel refill warning signal is issued and the vehicle is driven even when the fuel level gauge fails. It can prevent the risk of starting stop due to lack of fuel.
    EXAMPLE
    Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
    1 is a circuit diagram illustrating a fuel tank level warning device according to the present invention, and FIG. 2 is a control flowchart of the fuel tank level warning device shown in FIG.
    In the present invention, paying attention to the fact that the pressure of the boil-off gas of the fuel tank occurs in accordance with the fuel residual amount, the change in pressure is lost when the residual amount of fuel is zero. Therefore, in the present invention, it is designed to issue a warning signal when the pressure change becomes less than a predetermined set value.
    To this end, in the present invention, the tank pressure sensor 3 for measuring the pressure of the boil-off gas inside the tank is installed on the upper side of the fuel tank 1, and the measured pressure value is input to the control unit ECU 5.
    On the other hand, the fuel tank 1 is connected to a purge control system for preventing air pollution due to boil-off gas and saving fuel, and the system includes a charcoal canister 7 for storing the boil-off gas when the engine is stopped, and a charcoal canister ( It is installed between the 7) and the surge tank 11 of the engine and includes a purge solenoid valve 9 and a canister close valve 13 for controlling the discharge of the boil-off gas under the control of the controller 5.
    In addition, the fuel tank 1 is provided with a fuel level gauge 15 for detecting the level of the fuel, and the level of the remaining fuel amount is set in accordance with the electric signal generated when the float 17 descends in conjunction with the level drop. It is displayed at (19). In addition, the meter set 19 is connected to a warning light 21 for warning of fuel shortage, which is also connected to the collector of the output transistor TR of the controller 5.
    The operation of the present invention configured as described above is described in detail below with reference to FIG.
    First, in the present invention, it is determined whether the time t after starting has elapsed for a set time T, for example, 1000 seconds or more (S1). This is to have a time enough to purge the vapor gas pressure in the fuel tank 1 to be secured.
    As a result of the determination, when the set time T has elapsed, it is judged whether or not it is in an idle state (S2). This is to set the purge amount in the tank to the minimum state so that the pressure change value can be easily read.
    When the determination result is in the idle state, the canister close valve (C. Close V / V) 13 and the purge solenoid valve 9 are closed to set the purge control system to the closed circuit to evaporate the gas in the fuel tank 1. The pressure is set to rise (S3).
    Thereafter, the controller 5 determines that the pressure value detected through the tank pressure sensor 3 is different from the pressure value before setting the above-described purge control system to the closed loop, that is, the pressure change value ΔP is higher than the set pressure value P1. It is determined whether it is small (S4). In this case, the set pressure value P1 is determined according to the capacity of the engine displacement fuel tank and the like, and is set to the pressure when the fuel residual amount reaches a level that requires recharging.
    As a result of the determination, when the pressure change value ΔP is smaller than the set pressure value P1, the controller 5 outputs a fuel recharge warning signal to the output transistor TR. In this case, when the fuel is in the zero state, the pressure change ΔP also falls to almost zero. As a result, the output transistor TR is turned on to light the warning lamp 21 by grounding the warning lamp 21 (S5).
    In this case, the warning light 21 may be activated when the fuel level gauge 19 needs to be recharged according to the conventional method.
    That is, in the present invention, since the warning light is commonly connected to the output of the meter set 19 and the control part 5, the fuel refill warning is issued by the control part 5 even when the fuel level gauge 15 malfunctions or fails. As a result, the fuel level warning is highly reliable, and as a result, the vehicle is not stopped due to the fuel shortage while driving.
    As described above, in the present invention, the pressure change value of the fuel boil-off gas in the tank changes differently according to the remaining amount in the fuel tank, and when the pressure change value is lower than the reference value, a fuel refill warning signal is issued to drive even when the fuel level gauge fails. It can prevent the risk of starting stop due to lack of fuel.
    In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] In a fuel tank level warning device connected to a canister, a purge solenoid valve, and a purge control system including a canister close valve,
    A tank pressure sensor installed in the fuel tank for detecting a pressure of the boil-off gas in the fuel tank;
    When the pressure inside the fuel tank is stable and the tank pressure change value before and after closing all the valves of the purge control system discharged from the tank when the engine is idle is generated, a fuel recharge warning signal is generated. Control means,
    Fuel tank level warning device for a vehicle, characterized in that consisting of a warning light that is lit in accordance with the warning signal.
    [2" claim-type="Currently amended] The fuel level gauge of claim 1, further comprising: a fuel level gauge installed in the fuel tank to generate an electrical signal for the remaining fuel amount;
    And a meter set for displaying a residual fuel level according to the electrical signal, wherein the warning lamp is connected in parallel to the output of the meter set and the control means.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-07|Application filed by 김영귀, 기아자동차 주식회사
    1996-12-07|Priority to KR1019960062818A
    1998-09-05|Publication of KR19980044700A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960062818A|KR19980044700A|1996-12-07|1996-12-07|Fuel tank level warning device|
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