• 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:
    Provided is an EGR control apparatus for an internal combustion engine that can reduce the number of suitable maneuvers and easily cope with specification changes. The operating state detection means 1, the fuel injection amount calculation means 2, the normal and transient determination means 3, the intake air amount measurement means 4, the intake pressure detection means 5, the exhaust pressure detection means 6 and the target The requested EGR flow path area calculating means 10 and the requested EGR flow path area calculating means for calculating the required EGR flow path area from the outputs of the EGR rate calculating means 7, the target EGR amount calculating means 6, and the forward processing means 9. EGR valve drive for driving the EGR control means at the output of the requested EGR valve opening area calculating means 11 for correcting the output of the 10 and calculating the EGR valve required opening area and the requested EGR valve opening area calculating means 11. Configuration consisting of means (12).
    公开号:KR19980070590A
    申请号:KR1019980001371
    申请日:1998-01-19
    公开日:1998-10-26
    发明作者:이토야마히로유키
    申请人:하나와 요시칸즈；닛산지도샤(주)；
    IPC主号:
    专利说明:

    Exhaust Recirculation Control Device of Internal Combustion Engine
    The present invention relates to an exhaust recirculation (EGR) control device of an internal combustion engine, in particular a diesel engine.
    In the conventional EGR control, there are various techniques for setting the required EGR valve command value, for example, there is a technique described in Japanese Patent Application No. 07-209527.
    This sets up a table that calculates the required EGR valve opening area from the required EGR amount, the collector internal pressure and the exhaust pressure, and converts the opening area-command value so that the actual EGR amount (rate) becomes the required value.
    However, in the EGR valve command value setting method such as the former, the table for converting the opening area-command value does not become the same as the single-characteristic of the EGR valve in the diameter and processing of the EGR passage and does not become a setting that does not depend on the single-characteristic. Can't. Therefore, it has been found that the characteristic of the EGR valve alone becomes insignificant in control, and therefore, a lot of suitable air is required.
    An object of the present invention is to easily set the required EGR valve opening area (command value) by using the EGR valve single characteristic.
    As a means for solving the above object, in the EGR control apparatus of the internal combustion engine according to claim 1 of the present invention, as shown in the claim correspondence of FIG. 1, an operating state that detects the basic operating state such as engine speed, accelerator opening degree, water temperature, etc. It is judged whether it is normal or transient at the output of the fuel injection amount calculation means 2 and the operation state detection means 1 which calculate the fuel injection amount which is the basis from the output of the detection means 1 and its operation state detection means 1. Normally, the transient determination means 3, the intake air amount measurement means 4, the suction pressure detection means 5 for detecting the suction pressure, the exhaust pressure detection means 6 for detecting the exhaust pressure, and the operation state detection means ( 1) and a target EGR rate calculating means 7 for calculating the target EGR rate at the output of the fuel injection amount calculating means 2 and a target at the output of the intake air amount estimating means 4 and the target EGR rate calculating means 7. EGR amount of Forward processing means 9 for performing forward processing corresponding to the intake-capacity capacity to the output of the target EGR amount calculating means 8 and the output of the target EGR amount calculating means 8 from the outputs of the normal and transient determination means 3 to be calculated. The required EGR flow path area calculating means 10 for calculating the required EGR flow path area at the output of the required EGR valve opening area calculating means for correcting the output of the requested EGR flow path area calculating means 10 and calculating the EGR valve required opening area. (11) and the EGR valve drive means 12 which drives an EGR valve by the output of the requested EGR valve opening area calculating means 11, It is set as the structure.
    In the EGR control apparatus of the internal combustion engine of Claim 2, the correction coefficient at the time of calculating the required opening area of the EGR valve of the said required EGR valve opening area calculating means in the EGR control apparatus of Claim 1 is represented by the following formula. The value calculated by
    Kaev = [1 / {1- (Aevs / AVPS) 2 }] 0.5
    Kaev: Required Euro Area Correction Factor
    Aevs: Required Euro Area
    AVPS: Integer (EGR diameter equivalent)
    1 is a claim correspondence diagram.
    2 is an EGR valve opening area calculation flow according to the present embodiment.
    3 is a target EGR amount calculation flow of the present embodiment.
    4 is a calculation flow of the cylinder intake air amount according to the present embodiment.
    5 is an intake air amount calculation flow of the present embodiment.
    6 is an explanatory diagram showing a voltage-intake amount conversion table according to the present embodiment.
    7 is a target EGR rate calculation flow of the present embodiment.
    8 is a target EGR rate map of the present embodiment.
    9 is an explanatory diagram showing a target EGR rate water temperature correction coefficient table of the present embodiment.
    10 is an engine slowdown determination flow of the present embodiment;
    11 is an EGR valve request opening area calculation flow according to the present embodiment.
    12 is an explanatory diagram showing an example of setting the aperture area correction coefficient table according to the present embodiment;
    Fig. 13 is an EGR valve request opening area calculation flow of the present embodiment.
    14 is a schematic diagram of an EGR system according to the present embodiment;
    15 is an explanatory diagram showing an EGR valve opening area-drive signal conversion table according to the present embodiment;
    16 is a fuel injection amount calculation flow of the present embodiment;
    17 is a basic fuel injection amount map of the present embodiment;
    * Explanation of symbols for main parts of the drawings
    1: operation state detection means 2: fuel injection amount calculation means
    3: normal and transient determination means 4; Intake air quantity measuring means
    5 suction pressure detecting means 6 exhaust pressure detecting means
    7: Target EGR Rate Calculation Means 8: Target EGR Rate Calculation Means
    9 advance processing means 10 required EGR flow path area calculation means
    11: required EGR valve opening area calculation means
    12: EGR valve driving means
    EMBODIMENT OF THE INVENTION Next, embodiment of this invention is described based on drawing.
    2 to 17 show the flow of this embodiment, tables and maps necessary for it.
    The method for calculating the EGR valve opening area will be described later with reference to FIGS. 11, 12, and 13.
    First, the flow of FIG. 2 is demonstrated about EGR valve opening area calculation. This flow is a flow when no forward idle clamp is performed and is used in the present embodiment.
    First, calculate the target EGR amount. This method will be described later with reference to FIG. 3. The intake air pressure Pm is read at S2, and the exhaust pressure Pexh is read at S3. The EGR flow rate equivalent value Cqe is calculated by the formula shown in S4, and the flow path area Aevs is calculated by writing the required EGR amounts Tqek and Cqe in S5. In S6, Aevs correction is performed, the opening area is calculated, and the processing ends. This calculation method will be described later.
    Fig. 3 is a flow for calculating the target EGR amount and is calculated with the timing of engine rotation or its synchronization.
    First, the suction fresh air amount Qacn for each intake air of the S1 collector inlet is calculated. This method will be described later using FIG. 4. In S2, the target EGR rate Megr is calculated. This method will be described later with reference to FIG. The target EGR amount Mqec for each intake is calculated by the formula shown in S3. In S4, the intermediate variable Rqec is shown. The forward correction process is performed by the forward correction process in the manner shown in S5, and the result is Tqec. This expression simplifies normal advancing. The Tqec obtained from S6 to S5 is converted to the required amount for each unit time with respect to the required amount of EGR for each intake air, and the processing ends as Tqek.
    4 is a calculation flow of the cylinder intake air amount, and is calculated at a timing synchronized with engine rotation.
    First, the engine speed Ne is read and the fresh air amount Qac0 per intake air is calculated from the intake air amount Qas0 in the manner shown in S2. The intake air amount Qas0 will be described later with reference to FIGS. 5 and 6. The process ends with Qac0 calculated at the predetermined rotation L in S3 as Qacn. This predetermined rotation Qac0 is the value of the collector inlet because there is a transport delay from the measurement position of the intake air amount detection means to the collector inlet.
    Fig. 5 is a flow for calculating the intake air amount Qas0 and is calculated at time synchronization every 4 msec.
    In S1, the output voltage of the means for detecting the intake air amount, such as an air flow meter, is read out, and converted from S2 using the characteristic table (voltage-intake amount conversion table) of the detection means shown in FIG. 6, and the weighted average processing is performed in S3. The process ends.
    7 is a flow for calculating the target EGR rate Megr, which is calculated at timing synchronized with engine rotation.
    First, engine rotation speed Ne, fuel injection quantity Qso1, and engine cooling water temperature Tw are read.
    In S2, Ne and Qso1 are searched for the map shown in Fig. 8, and the basic target EGR rate Megrb is calculated. In S3, a coefficient table for correcting the target EGR rate for the engine water temperature shown in FIG. 9, for example, is searched for and is referred to as Kegr-tw. The target EGR rate Megr is calculated by the formula shown in S4. In S5, it is determined whether or not the state of the engine is a full width state. This method will be described later with reference to FIG. If it is determined in S6 that it is determined to be full, it is terminated as it is. If it is determined that it is not full, the processing is terminated with the target EGR rate Megr as 0.
    Fig. 10 is a flow for determining the full width of the engine and is calculated at timing synchronized with time such as 10 msec.
    First, the engine speed Ne is read out and compared to the full-width decision slice level NRPMK at S2. When Ne is large, the flow advances to S3. Comparing with the counter Tmrkb after the full width determination by rotation in S3 and predetermined time TMRKBP, it progresses to S4 when it completes and a process completes as a full width. When Ne is small in S2, the process proceeds to S6, Tmrlb is cleared, and the processing ends as not full. When Tmrkb is small in S3, the process proceeds to S5, the Tmrkb is incremented, the process proceeds to S7, and the process is finished because it is not full.
    In this process, the engine speed is set to a predetermined value or more (e.g., 400 or more), and the process is determined to be a full width when a predetermined time elapses.
    11 is a first embodiment of the flow for calculating the EGR valve required opening area.
    First, the correction coefficient Kaev is calculated in the table shown in FIG. 12, for example, by reading the required EGR flow path area Aevs at S1 and dividing Aevs by the constant AVPS varying by the shape of the EGR tube at S2. This table may be set from the results obtained by measuring the flow rate characteristics in a system including an EGR pipe or from theoretical calculations. Fine adjustment is possible by the value of AVPS. In S3, Aevs is multiplied by Kaev to calculate the EGR valve opening area Aevf to terminate the processing.
    13 is a second embodiment of the flow for calculating the EGR valve required opening area.
    First, the required EGR flow path area Aevs is read in S1, and the correction coefficient Kaev is calculated in the manner shown in S2. This equation is obtained from the equation of fluid dynamics based on the schematic diagram shown in FIG. Fine adjustment is possible by the value of AVPS. In S3, Aevs is multiplied by Kaev, the EGR valve opening area Aevf is calculated, and the processing ends.
    15 is an explanatory diagram showing an EGR valve opening area-drive signal conversion table according to the present embodiment.
    16 is a flow for calculating the fuel injection amount, and the processing is performed at a timing synchronized with the rotation.
    First, the engine speed Ne is read. The accelerator opening C1 is read in S2. The fuel injection amount is set in the map shown in Fig. 17 at Ne at S3 and at C1, and Mqdrv is set. In step S4, the water temperature is increased and the like is corrected, and the process is finished as the fuel injection amount Qsol.
    As described above, in the EGR control apparatus of the internal combustion engine of the present invention, the command value can be easily set using the EGR valve single characteristic to facilitate the reduction of the required man-hours and the correspondence to the specification change.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] An operation state detecting means 1 for detecting an engine operating state such as an engine speed, an accelerator opening degree, a water temperature, and a fuel injection amount calculating means for calculating an amount of fuel injection that is the basis of the output from the operating state detecting means 1; ), Normal and transient determination means 3 for determining a normal or transient state at the output of the operation state detection means 1, suction air quantity measuring means 4, suction pressure detection means 5, and Target exhaust recirculation rate calculating means 7 for calculating a target exhaust recirculation rate from the output of the air pressure detecting means 6, the operation state detecting means 1, and the fuel injection amount calculating means 2, and the intake air amount measurement. The target exhaust recirculation amount calculating means 8 for calculating the target exhaust recirculation amount at the output of the means 4 and the target exhaust recirculation rate calculating means 9, and at the output of the normal and transient determination means 3 (8). Before performing forward processing equivalent to the intake machine capacity at the output of Required exhaust recirculation flow path area calculating means for calculating the required exhaust recirculation flow path area from the outputs of the true processing means 9, the suction pressure detecting means 5, the exhaust pressure detecting means 6, and the forward processing means 9 ( 10) and the required exhaust recirculation valve opening area calculating means 11 for correcting the output of the required exhaust recirculating flow path area calculating means 10 to calculate the exhaust recirculating valve required opening area, and the requested exhaust recirculating valve opening area. An exhaust recirculation control apparatus for an internal combustion engine, characterized in that the exhaust recirculation valve driving means (12) drives the exhaust recirculation control means at the output of the computing means (11).
    [2" claim-type="Currently amended] The exhaust gas of the internal combustion engine according to claim 1, wherein the correction coefficient at the time of calculating the required opening area of the exhaust recirculation valve of the required exhaust recirculation valve opening area calculating means 11 is calculated by the following formula. Recirculation Control.
    Kaev = [1 / {1- (Aevs / AVPS) 2 }] 0.5
    Kaev: Required Euro Area Correction Factor
    Aevs: Required Euro Area
    AVPS: Integer (Exhaust recirculation diameter equivalent)
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    同族专利:
    公开号 | 公开日
    JP3551675B2|2004-08-11|
    GB2321317B|1998-12-23|
    GB9801298D0|1998-03-18|
    US6019094A|2000-02-01|
    DE19802106C2|2000-03-16|
    GB2321317A|1998-07-22|
    DE19802106A1|1998-08-27|
    JPH10205394A|1998-08-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-01-21|Priority to JP97-8393
    1997-01-21|Priority to JP00839397A
    1998-01-19|Application filed by 하나와 요시칸즈, 닛산지도샤(주)
    1998-10-26|Publication of KR19980070590A
    2001-03-02|Application granted
    2001-03-02|Publication of KR100284376B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP97-8393|1997-01-21|
    JP00839397A|JP3551675B2|1997-01-21|1997-01-21|EGR control device for internal combustion engine|
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