what is the function or the slot which is responsable of plot update in QChart?

Hello, I need to plot in live with Qchart, but it didn't update with the code below.

So I am searching the function or the slot which is responsable of plot update, so I will activate it by myself.

Code:

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def __init__(self, params):
    super().__init__()
 
    #init with params
 
    self.mycurv.append(QLineSeries(self))
    self.addSeries(self.allCruvs[-1])
 
def plotData(self, Time, Values, color=None, curvIndex=0):
    self.mycurv.clear()
    lastTime = self.myZero
    for i, theTime in enumerate(Time):
        if (theTime > lastTime + MININTERVALTIME):
            self.mycurv.append(lastTime - self.myZero, Values[i])
 
         self.mycurv.append(theTime - self.myZero, Values[i])
        lastTime = theTime
    self.update()

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if at the end in stead of self.update, I put

Code:

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self.removeAllseries()
self.addseries(self.mycurv)

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it is working in live for a while, and the the application crashes.

Thanks in advance