I didn't read all the 45 pages of this thread, but reading last two pages, it looks like a solution to this problem has not yet been found.
So here it is my workaround: set the speed limiter to 70 km / h.
In this way, regardless of outside temperature, of how much you press the accelerator pedal and how steep is the slope, the combustion engine will NEVER start!
Explanation:
I examined the patent of the e-tech engine: it describes a coupler between ICE (Internal Combustion Engine) and HSG (auxiliary electric motor, High voltage Starter / Generator); HSG has 2 functions:
1) start the combustion engine
2) override electric motor upon electric gearshift
Unfortunately, this coupler is also described as "optional". This means that if it's not there, HSG and ICE (Internal Combustion Engine) are always mechanically linked: when HSG rotates, also ICE must rotate.
But, by design, HSG starts every time car reaches 75 km / h: when car reaches this speed, the main electric motor is turned off (to turn off the torque and allow gear shifting); at the same time, HSG starts to compensate power loss and reduce the acceleration loss of the car due to motor being turned off.
So, anytime you reach 75 km / h, ICE starts rotating. By design, it should rotate in idle, without consuming fuel, acting just as a mechanical connection between HSG and wheels; but it looks like SW is not properly written, hence as soon as ICE starts rotating, it is also turned on and begins consuming fuel. And probably once it is turned on, it's not safe for it to be turned immediately off, some minutes shall elapse.
Above mechanism also explains the big acceleration loss you encounter during strong accelerations:
HSG has just 25 kW power, while main motor has 60 kW; so, as long as you are accelerating using at most 25 kW, you will not notice at all the gear shift at 75 km / h; but if you are accelerating at 50 kW, you will feel a half-cut of the acceleration!
