Nowadays the modern vehicles are equipped with even more and even more modern electronic control units (ECUs) thus the electronic network of such an automobile is considered by right one of the most difficult embedded systems at all. Additionally those functions, are monitored, developped or even taken over from the driver of the car, make these systems safety critical.
Among these electronic control units the transmission control unit (TCU) has a big role because of the comfort functions they provide the driver needs only to focus on the driving, the shifting methods will be done by the automatic in every circumstance. So we can say there remains more time and energy for the driver to enjoy driving.
Another fact why automatic transmissions get even more popular that the engineers take care to work out the best shifting strategy which explains why the fuel efficiency of an automatic tranmission is higher than a manual transmission’s.
We can see even more cars are equipped with an automatic transmission and because they directly controls the driving they are strongly safety relevant parts. That is why we need to take care of testing the TCU – which is responsible for the control – well enough to guarantee the quality and the right functionality.
This paper is about two software versions help us to fulfill these testing requirements. One of them is an end-of-line testsoftware and the other one is an endurance software which simulates a cca. 15 years long usage of the TCU within 1-2 months.