We study the streaming potential modulated autonomous filling dynamics of a viscoelastic fluid in a microfluidic channel. To describe the rheology of viscoelastic fluid, we consider a simplified Phan-Thien-Tanner (sPTT) model. Considering the electroviscous effect, along with the effects of surface tension force and viscous resistance, we derive a reduced-order model for obtaining the variations in the filling dynamics for different physical parameters of the system. We observe that a complex competition between the viscoelasticity and the electroviscous effect leads to the non-trivial behaviour in the temporal evolution of the filling dynamics. Moreover, our analysis unveils that an enhancement in the electroviscous effect due to increasing viscoelasticity of the fluid leads to a non-linear reduction in the filling length of the fluid in the channel. Consequently, the notion of having a higher filling length for more elastic nature of the fluid is contradicted here due to the presence of the electroviscous effect. Finally, we establish a regime $\left(x\sim \sqrt{t}\right)$ at the later stage of filling in the channel. We show that this regime is unique to the surface tension driven filling of viscoelastic fluids in a charged fluidic pathways under the influence of electroviscous effect.

我们研究了微流体通道中的粘弹性流体的流势调制自主填充动力学。为了描述粘弹性流体的流变性，我们考虑简化的Phan-Thien-Tanner（sPTT）模型。考虑到电粘性效应，以及表面张力和粘性阻力的影响，我们导出了降阶模型，用于获得系统不同物理参数的填充动力学变化。我们观察到，粘弹性和电粘性效应之间的复杂竞争会导致填充动力学的时间演化中的非平凡行为。此外，我们的分析揭示，由于流体粘弹性的增加，电粘性效应的增强导致通道中流体填充长度的非线性减小。因此，由于电粘性效应的存在，具有较高的填充长度以实现流体的更多弹性性质的概念在这里是矛盾的。最后，我们建立一个制度$（X〜\sqrt{Ť}）$在填充渠道的后期阶段。我们表明，这种机制是唯一的表面张力驱动的粘弹性流体在电粘性效应的影响下带电流体路径中的填充。