• 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 method for resolving starting failure during cold start of a vehicle, and more particularly, to prevent starting failure caused by a spark plug being wet due to excessive supply of cranking fuel during cold starting. The present invention relates to a method of starting during a cold start failure in which a spark plug is dried by adjusting a fuel supply amount and performing engine motoring. The start method in the case of a cold start failure of the present invention is a method of starting a vehicle, the first step in which the ECU 2 determines whether or not a cold start state and determines the amount of cranking fuel supply, cranking in a state where fuel is supplied. Cranking operation by activating the motor (8) and ignition using the ignition plug (6), the running standby state is maintained when starting, if the fuel pump (4) after a certain time ) Is a third step of turning off, the fourth step of performing the motoring of the engine using the cranking motor 8 in the state where the fuel pump (4) is off, the motoring for a predetermined time and the fuel pump (4) The second step is to turn on again to supply fuel and start the engine.
    公开号:KR19980056857A
    申请号:KR1019960076127
    申请日:1996-12-30
    公开日:1998-09-25
    发明作者:고성석
    申请人:박병재；현대자동차 주식회사；
    IPC主号:
    专利说明:

    How to start during cold start
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for resolving starting failure during cold start of a vehicle, and more particularly, to prevent starting failure caused by a spark plug being wet due to excessive supply of cranking fuel during cold starting. The present invention relates to a method of starting during a cold start failure in which a spark plug is dried by adjusting a fuel supply amount and performing engine motoring.
    In general, in the case of starting the vehicle, in the cold starting state, the amount of fuel used for cranking is increased to secure sufficient heat quantity to start the vehicle. This means that more fuel is supplied than the driving state, which is a cause of starting failure during cold start.
    That is, since the cranking fuel supply amount is excessively provided, spark plugs for igniting the fuel are frequently wetted by the fuel and thus do not generate enough sparks.
    However, conventionally, as shown in FIG. 1, the operating time and the cranking time of the fuel pump are always kept constant, and the supply amount of the cranking fuel is kept constant, so once the spark plug is wet, it is impossible to start the spark plug. There was a problem of waiting for a long time to dry. This was especially a factor during the winter months, which was a factor in consumer complaints.
    The present invention has been made in order to solve the above problems, an object of the present invention is to prevent the start-up poor start-up poor cold start by wet fuel by excessively supplied spark plug during cold start To provide a way to start.
    In the cold start failure start method of the present invention for achieving the above object, in the start method of the vehicle, the first step in which the ECU (2) determines whether the cold start state and the supply amount of cranking fuel, The second step of performing the cranking operation by operating the cranking motor (8) in the supplied state and ignition by using the spark plug (6), the running standby state is maintained when starting, and if the start is not After the elapsed time, the third step of turning off the fuel pump 4, the fourth step of performing motoring of the engine using the cranking motor 8 while the fuel pump 4 is off, and the motoring for a predetermined time It is characterized in that it consists of a fifth step of supplying fuel and starting the fuel pump (4) again.
    1 is a graph showing the state of the control variable during cold start in a conventional vehicle,
    Figure 2 is a graph showing the state of the control variable by the method of the present invention,
    3 is a partial block circuit diagram of a vehicle to which the method of the present invention is applied;
    4 is a flow chart illustrating the method of the invention.
    * Explanation of symbols for main parts of the drawings
    2: ECU 4: Fuel Pump
    6: spark plug 8: cranking motor
    Hereinafter, with reference to the accompanying drawings will be described in detail the starting method during cold start failure of the present invention.
    The method of the present invention is to solve the starting failure generated during cold startup, and is a method that can eliminate the ignition failure caused by the spark plug being wet by the excessive fuel supply during the cold startup. Briefly describing the features of the method of the present invention, it is a method that can be started quickly by adjusting the amount of fuel supplied to the engine and drying the spark plug using engine motoring.
    The method of the present invention comprises the following steps: a first step in which the ECU 2 determines whether it is in a cold start state and determines the amount of cranking fuel supply, and cranking by operating the cranking motor 8 in a state where fuel is supplied. The second step of performing the operation and igniting using the spark plug 6, the start standby state when the start is started, the third step of turning off the fuel pump 4 after a certain period of time if the start is not started, the fuel In the fourth step of performing the motoring of the engine using the cranking motor 8 while the pump 4 is turned off, the motoring is performed for a predetermined time and the fuel pump 4 is turned on again to supply fuel. It consists of a fifth stage of starting.
    Determination of whether or not cold start is usually measured by measuring the water temperature of the coolant, and if it is determined that the cold start state is changed to the operating state of the fuel pump to increase the fuel supply amount to start. However, the spark plug is wetted by the fuel supplied at this time.
    In the method of the present invention, the fuel amount is increased in the same manner as conventionally used in the cold start state. After that, the cranking motor 8 is normally operated to perform the cranking operation. The spark plug 6 also performs ignition in accordance with the ignition cycle.
    If the ignition is normally achieved, the ECU 2 detects that the start is stopped and enters the travel standby state.
    However, if the spark plug 6 is not wet and does not ignite as described above, after a predetermined time elapses, the ECU 2 outputs a control signal voltage to turn off the fuel pump 4. Therefore, the fuel supply is cut off, and the spark plug 6 is prevented from getting wet by the fuel anymore. The time can be determined at any time in design.
    In the present invention, the motor cranking operation of the engine is continued using the cranking motor 8 at this time. In this way, the spark plug 6 is dried by an increase in temperature generated by the motoring.
    Off of the fuel pump 4 is also performed for a predetermined time, which can also be arbitrarily determined. When a predetermined time elapses, the ECU 2 outputs a control signal voltage to operate the fuel pump 4 to start supplying fuel again. The fuel supply amount is supplied by supplying a fuel supply amount which is normally set or by setting a fuel supply amount such that the spark plug 6 is not wet.
    By reducing the fuel supply, the spark plug dries and does not get wet again, which increases the probability that the ignition will succeed and start. In addition, since the temperature has risen to some extent during the first start, the state is out of the cold start state, so the probability of starting the start is higher.
    If the fuel supply is reduced and supplied and the engine does not start even when the engine is started, the fuel supply is further reduced by performing the above-described third step. By doing this, the probability of starting up becomes even higher.
    As described above, according to the starting method during the cold start failure of the present invention, the spark plug is wetted by the fuel during the cold start, and thus there is an advantage that the starting can be prevented from being poor.
    Although the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the invention, and such variations or modifications will belong to the appended claims. .
    权利要求:
    Claims (3)
    [1" claim-type="Currently amended] In the vehicle starting method, a first step of judging whether or not a cold start state is performed by the ECU 2 and determining a cranking fuel supply amount, and performs a cranking operation by operating the cranking motor 8 in a state where fuel is supplied. And the second stage of ignition using the ignition plug 6, the running standby state when the start is started, and the third stage of turning off the fuel pump 4 after a predetermined time when the start is not started, the fuel pump 4 ) Is the fourth step of performing the motoring of the engine using the cranking motor (8) and the motoring for a predetermined time and turning on the fuel pump (4) to supply fuel and start Start-up method during cold start failure, characterized in that the fifth step.
    [2" claim-type="Currently amended] The start method according to claim 1, wherein the fuel supply amount is reduced in the fifth step than the initial fuel supply amount in the first step.
    [3" claim-type="Currently amended] The start method according to claim 1, wherein the third step and the fourth step are continuously performed until starting.
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    同族专利:
    公开号 | 公开日
    KR100258446B1|2000-06-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-30|Application filed by 박병재, 현대자동차 주식회사
    1996-12-30|Priority to KR1019960076127A
    1998-09-25|Publication of KR19980056857A
    2000-06-01|Application granted
    2000-06-01|Publication of KR100258446B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960076127A|KR100258446B1|1996-12-30|1996-12-30|Starting method of misfiring cold starting|
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