A method to control the execution of a shift to a lower gear with a released accelerator pedal (22) in a drivetrain (6) provided with a dual-clutch, servo-assisted transmission (7) provides the following steps: opening, in a first instant (t1), an outgoing clutch (16A); closing, in the first instant (t1), an incoming clutch (16B); completing the opening of the outgoing clutch (16A) by means of a first linear ramp in a second instant; synchronizing, between the second instant and a third instant (t4), a rotation speed ([omega]E) of the internal combustion engine (4) with a rotation speed ([omega]B) of the incoming clutch (16B); closing of the incoming clutch (16B) by means of a second linear ramp starting from a fourth instant (t2), which is prior to or coincides with the second instant; completing the closing of the incoming clutch (16B) in a fifth instant (t3), which coincides with or is subsequent to the second instant; and activating the internal combustion engine (4) so as to generate a torque (TE) between the fourth instant (t2) and the third instant (t4).
一种在具有双离合器式伺服辅助变速箱(7)的动力传动系统(6)中在释放加速踏板(22)的情况下控制向更低档位进行变换的方法,提供了以下步骤:在第一时刻(t1)使离开的离合器(16A)打开;在第一时刻(t1)使进入的离合器(16B)闭合;通过第一线性斜坡在第二时刻使离开的离合器(16A)完全打开;在第二时刻和第三时刻(t4)之间使内燃机(4)的转速(ωE)与进入的离合器(16B)的转速(ωB)同步;从第四时刻(t2)开始通过第二线性斜坡使进入的离合器(16B)闭合,第四时刻在第二时刻之前或者与第二时刻重合;在第五时刻(t3)使进入的离合器(16B)完全闭合,第五时刻与第二时刻重合或者在第二时刻之后;以及在第四时刻(t2)和第三时刻(t4)之间启动内燃机(4)以产生扭矩(TE)。
Method to control execution of shift to lower gear with released accelerator pedal
在释放加速踏板的情况下控制向更低档位进行变换的方法
2021-03-30
Patent
Elektronische Ressource
Chinesisch
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