CN1045929C - 汽车进入和结束滑行过程时离合器的自动控制方法 - Google Patents
汽车进入和结束滑行过程时离合器的自动控制方法 Download PDFInfo
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- B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
- B60K23/02—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for main transmission clutches
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16D48/066—Control of fluid pressure, e.g. using an accumulator
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- B60W30/18—Propelling the vehicle
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- B60W2510/00—Input parameters relating to a particular sub-units
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- B60W2710/00—Output or target parameters relating to a particular sub-units
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- F16D2500/00—External control of clutches by electric or electronic means
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Abstract
为了使汽车进入或结束一个滑行过程通过离合器将驱动发动机与汽车传动部分接合或脱开,快速的油门踏板位置变化会引起冲击和不舒适的接合或脱离过程。对此希望不仅是平稳和舒适的,而且尽可能快地进行接合或脱离过程。本发明推荐采用一种控制方法进行接合或脱离过程,其中根据油门踏板位置的变化速度及由此导出的发动机空转转速进行脱离过程的控制,对于接合过程则考虑发动机转速的瞬时变化。如果这些控制变量超过预定值,则根据实测的油门踏板位置或发动机转速的瞬时变量实行转换过程。
Description
本发明涉及汽车进入和结束滑行过程时离合器的自动控制方法。
从发明DE-OS2748697中人们了解到一种传动装置及汽车运行操作的方法,其中驱动发动机在滑行过程与传动部分脱开,并停止工作。当发动机由靠汽车质量惯性所推进的车轮以高于汽车油门踏板位置角度相应的转速带动时,总会出现这类滑行过程。如果发动机在这样的滑行过程中与传动部分脱开并停机,则可不影响运行特性,而使汽车的总耗油量降低。
对此从发明人的DE-OS3026489中可以了解到用于汽车的上述传动装置,其中,当油门踏板位置角度或节气门开启角度朝关闭方向的瞬时变量超过一个预定值时,发动机总是与传动部分脱离。通过利用关于油门踏板位置角度或节气门开启角度朝关闭方向的瞬时变化的预定限值,可以容易地判断预测将会出现的滑行状态。由此可以很早地使离合器脱开连接状态,以便使驱动发动机脱离。本发明对此建议将油门踏板位置角度或节气门开启角度以表格的形式存放在计算机存储器中,使每一位置角度对应相应的发动机无载运行转速。无载运行转速是发动机在无载荷状态下(即离合器脱开时)油门踏板或节气门在一个确定位置角度处所设定的发动机转速。
通过测定节气门开启角度或油门踏板位置角度的瞬时变量可以很好地利用发动机的离合器脱开过程,以开始滑行过程,然而此位置量在滑行过程终点离合器接合过程中不可应用,因为节气门开启角度或油门踏板位置角度不能表示对于离合器接合过程十分重要的实际发动机转速。为此,用已知的离合器脱离方法不能充分平稳并由此舒适地进行离合器脱离,因为从节气门开启角度或油门踏板位置角度的瞬时变化中只能得到关于将出现的滑行过程的快速信息。
本发明的目的在于提出使汽车进入或结束滑行过程中而自动操作离合器的方法。
上述目的是这样实现的,为使汽车进入一个滑行过程时,通过离合器将汽车传动装置中发动机与汽车传动部分自动脱离,在发动机和传动齿轮箱之间的离合器可借助计算机进行操作,该离合器可脱开连接状态以进入汽车的滑行状态,其中,适合用作使离合器脱开连接状态的指令参数是向关闭方向运动的油门踏板位置角度相对时间的变化超过一个预定的值,该方法包括以下步骤:在汽车运行过程中,周期性地测定油门踏板位置角度及其瞬时内的变化,以及齿轮箱输入轴转速;用测定的油门踏板位置角度值计算出对应的发动机无载运行转速,或从计算机存储器中的表格中取出对应的发动机无载运行转速;在无载运行转速未超过传动齿轮箱输入轴转速时,离合器脱开连接状态,从而使电动机与其它的传动部分分离;当所测定的油门踏板位置角度向关闭方向的瞬时变化值超过一个预定值时,则由计算机计算出,或从另一个存储器中取出相应于所测定的油门踏板位置角度的瞬时变化值的修正量,将它加到所确定的传动齿轮箱输入轴转速上形成修正后的齿轮箱输入轴转速,将无载运行转速与修正的齿轮箱输入轴转速比较,在无载运行转速未超过修正的齿轮箱输入轴转速时,离合器脱开连接状态,从而使电动机与其它传动部分分离。
离合器的接合过程与上述方式相似,为使汽车传动装置中的发动机与其它传动装置自动接合,在汽车运行过程中,计算机周期性地测定发动机转速及其瞬时变化;在发动机转速超过齿轮箱输入轴转速时,将离合器接合,由此使发动机与传动部分连接;在发动机转速快速变化时,例如,在由于快速踩下油门踏板时,当所测定的发动机转速瞬时变化超过一个预定值时,由计算机计算出或从一个计算机存储器中取出一个与发动机转速的瞬时变化相关的修正量,而后从测定的齿轮箱输入轴转速减去此量形成一个修正的齿轮箱输入轴转速,将发动机转速与修正后的齿轮箱输入轴转速相比较,在发动机转速超过修正后的齿轮箱输入轴转速时将离合器接合。
根据本发明的汽车进入或结束滑行过程而自动操作离合器的方法,在汽车运行过程中,由控制计算机不断进行齿轮箱输入轴转速与无载转速的比较过程中,提前确定无载转速低于修正的齿轮箱输入轴转速,由此可以很早、并顺当地使离合器脱开接合状态。在离合器闭合过程中,通过控制计算机周期性进行发动机转速与修正的齿轮箱输入轴转速比较中,判别出发动机转速超过修正的齿轮箱输入轴转速,这样可以根据发动机转速的变化速度,舒适并快速进入离合器的接合过程。当在滑行过程中出现危险情况,要求迅速提高行驶速度时,这种快速将发动机与汽车传动部分接合是尤其重要的。
本发明可以借助于实施例进行说明。在此给出了要说明的附图。其中
图1是关于带有控制计算机和测量值传感器的传动装置的示意说明图,
图2是在离合器脱开过程中转速相对时间变化过程示意图,
图3是在离合器接合过程中类似图2的说明示意图
在图1中只是汽车传动装置的示意说明,其中1用来表示驱动发动机,2表示传动齿轮箱。发动机1和齿轮箱2通过离合器3相互连接,离合器3与发动机曲轴7及齿轮箱的输入轴8固定安装。传动装置在从动侧具有齿轮箱输出轴9,用该输出轴9来驱动差动装置4。由差动装置4伸出二根传动轴10,11,在这两根传动轴的端部固定安装着驱动轮5,6。
该传动装置设置了一台控制计算机12,它至少有一个存储器13。该控制计算机通过图中未进一步详细画出的数据传输线与传感器14,15相连接,它们用以测定发动机转速和齿轮箱输入轴8的转速。节气门开启角度和油门踏板16位置角度由传感器18测定,并把信号传给计算机12。为了在油门踏板16返回时,计算机12能够判断,是否进入滑行过程,或是否只是一个正常的换挡过程,可以通过传感器17为计算机提供此信息。
在汽车行驶过程中,计算机12周期性地从油门踏板位置角度信息测定发动机无载运行转速NFR,计算机12最好从计算机存储器13取出无载运行转速,在存储器中,节气门开启角度或油门踏板位置角度与发动机无载运行转速的对应关系以表格的形式存储。在本发明的另一方案中,可以通过计算机12,应用与油门踏板位置角度的数学对应关系计算出无载运行转速。
如图2所示,在时间点t0给计算机提供了关于实际无载运行转速NFR,以及关于齿轮箱实际输入轴转速NGE的信息。在汽车行驶过程中总是由计算机进行两个转速值的比较,一旦确定无载运行转速NFR未超过齿轮箱输入轴转速NGE,汽车司机要通过向关闭方向退回油门踏板进入滑行过程,一旦到达时间点t2,控制计算机12就脱开离合器,使发动机1与传动部分分离。
计算机除了确定节气门开启角度或油门踏板位置角度外,还周期性地判断上述位置量的瞬时变化,一旦控制计算机在时间点t1附近确定油门踏板位置角度向关闭方向的瞬时变化很快,并超过预定值时,则由计算机查询存储在另一计算机存储器中,与变化速度相符的转速值,它被加到时间点t1所测定的齿轮箱输入轴转速NGE上。
而后将由此计算出的经修正的齿轮箱输入轴转速值N′GE与根据油门踏板位置角度确定的实际无载运行速度N′FR(t1)比较,一旦无载运行转速N′FR未超过计算出的齿轮箱输入轴转速N′GE,则可与油门踏板位置角度的变化速度相适应地脱开离合器。通过这样对要进入的滑行过程提前判断,发动机可以比现在更早并转换更平稳地从传动部分脱离。
汽车运行时,在滑行过程终点要将发动机重新与传动部分连接,以使汽车在现有的速度上加速,此时节气门开启角度和油门踏板位置角度及其瞬时变量不能用以进行离合器自动接合过程的控制,因为它们不反应发动机实际转速。如图3所示,在时间点t0汽车以滑行速度运行,该速度可以由齿轮箱输入轴以数值NGE确定。在该时间点油门踏板已经向开通方向踩下,因此图1中的启动器19启动发动机,并使之达到无载转速NL。
缓慢地踩下油门踏板使发动机转速NM缓慢升高,此速度不断接近齿轮箱输入轴转速,并在时间点t2超过它。在运行过程中,控制计算机12也连续测定齿轮箱输入轴转速NGE和发动机转速NM,通过对两个转速不断比较,控制计算机12判定在时间点t2发动机转速NM超出齿轮箱输入轴转速,通过接合离合器3结束滑行过程。
因为到离合器完全进入连接状态需要一定时间,发动机转速NM以所谓的超过齿轮箱输入轴转速NGE,直到时间点t3发动机达到齿轮箱输入轴转速。
为了缩短发动机接合过程,在滑行过程终结时,根据本发明,控制计算机在汽车运行中也总是则测定发动机转速NM相对时间的瞬时变化。当汽车司机希望通过快速踩下油门踏板以尽快结束滑行过程,则按照曲线N′M以相对更陡的发动机转速结束滑行过程。
如果控制计算机在时间点t1附近测定,发动机转速N′M瞬时变化量超过预定限值,那么,控制计算机将从存放在计算机存储器内的表格中寻找出一个相应于发动机转速值的齿轮箱输入轴转速NGE的修正值,接着从在时间点t1测得的齿轮箱输入轴转速NGE渐去此修正值,由此形成用于接合的经修正的齿轮箱输入轴转速N″GE。此时,控制计算机12在进行实际测得的发动机转速N′M与修正的齿轮箱输入轴转速N″GE的比较中一旦确定,发动机转速超过修正的齿轮箱输入轴转速N″GE,则通过接合离合器3提前连接发动机。
在离合器接合过程中,与其在脱离过程中相似,对本发明方法特别重要的是,发动机在连接或脱离时的速度取决于所选择的控制变量的瞬时变化,也就是取决于节气门开启角度和油门踏板位置角度的瞬时变化或取决于发动机转速的瞬时变化。对此必须说明,从传感器17得到的转换操作杆信息对于汽车进入或结束滑行过程并非必不可少的,只是当滑行过程进行到汽车停止行驶时,并且希望紧接着从停止状态启动时,转换操作杆信息被用作对发动机起动的控制量。
Claims (3)
1.汽车传动装置中使发动机自动脱离的控制方法,其中在发动机和传动齿轮箱之间装有可借助计算机进行操作的离合器,该离合器可脱开连接状态以进入汽车的滑行状态,其中,适合用作对离合器脱开连接状态的指令参数是向关闭方向运动的油门踏板位置角度相对时间的变化超过一个预定的值,该方法包括以下步骤:
在汽车运行过程中,周期性地测定油门踏板位置角度及其瞬时内的变化,以及齿轮箱输入轴转速(NGE);
用测定的油门踏板位置角度值计算出对应的发动机无载运行转速(NFR),或从计算机存储器中的表格中取出对应的发动机无载运行转速;
在无载运行转速(NFR)未超过传动齿轮箱输入轴转速(NGE)时,离合器脱开连接状态,从而使电动机与其它的传动部分分离;
当所测定的油门踏板位置角度向关闭方向的瞬时变化值超过一个预定值时,则由计算机计算出,或从另一个存储器中取出相应于所测定的油门踏板位置角度的瞬时变化值的修正量,将它加到所确定的传动齿轮箱输入轴转速(NGE)上形成修正后的齿轮箱输入轴转速(N′GE),将无载运行转速(NFR)与修正的齿轮箱输入轴转速(N′GE)比较,在无载运行转速(NFR)未超过修正的齿轮箱输入轴转速(N′GE)时,离合器脱开连接状态,从而使电动机与其它传动部分分离。
2.汽车传动装置中使发动机自动接合的控制方法,其中在发动机和传动齿轮箱之间装有可借助计算机进行操作的离合器,它可进入连接状态以使滑行过程结束,该方法包括以下步骤:
在汽车运行过程中,计算机周期性地测定发动机转速及其瞬时变化,以及齿轮箱的输入轴转速(NGE);
在发动机转速(NM)超过齿轮箱输入轴转速(NGE)时,将离合器接合,由此使发动机与传动部分连接;
当所测定的发动机转速瞬时变化超过一个预定值时,由计算机计算出或从一个计算机存储器中取出一个与发动机转速的瞬时变化相关的修正量,而后从测定的齿轮箱输入轴转速(NGE)减去此量形成一个修正的齿轮箱输入轴转速(N″GE),将发动机转速(NM)与修正后的齿轮箱输入轴转速(N″GE)相比较,在发动机转速(NM)超过修正后的齿轮箱输入轴转速(N″GE)时将离合器接合。
3.如权利要求1所述的方法,其特征在于,不是测定油门踏板位置角度,而是测定节气门开启角度以及其瞬时变化量。
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DE4419633A1 (de) | 1994-12-15 |
GB9411480D0 (en) | 1994-07-27 |
CN1100690A (zh) | 1995-03-29 |
FR2706376B1 (fr) | 1998-11-06 |
JPH0771493A (ja) | 1995-03-17 |
JP3560363B2 (ja) | 2004-09-02 |
GB2279123A (en) | 1994-12-21 |
DE4419633B4 (de) | 2004-04-01 |
FR2706376A1 (fr) | 1994-12-23 |
GB2279123B (en) | 1997-08-20 |
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