When I was conducting engine tests, I encountered an eTPU crankshaft tooth counting error that caused the engine to no longer synchronize.
When I check "*cpba_tooth_period_log" in “crank_instance_t",I foung some member become very small。
The experimental results are as follows.While running, etpu_tooth_period_log[80] suddenly drops from 33800 to 21800.And crank states err occur.The rest of the etpu tooth period log(log[0],log[40],log[119],) data looks normal.
I checked the input crankshaft original signal and there was no signal anomaly when the fault occurred.I tested the duration of the first 1 and 2 teeth of the failure,They all last around 820us.
Here are some of my eTPU parameter matching values.
I also added an IO flag to the crankshaft interrupt function, which outputs the current state of the IO output after entering the interrupt.In the figure below, the blue signal is a sign that the entry crankshaft is interrupted.
Green indicates synchronization. When the green signal is high power level, it indicates non-synchronization("crank_states.eng_pos_state" is not "FS_ETPU_ENG_POS_FULL_SYNC").
As can be seen from the diagram, the crankshaft abnormal entry break caused the engine to no longer synchronize.
Could you help me analyze the cause of this problem and how to solve it?
Thank you very much!
