Hey, I work a lot on customer cars with emu classic and black. To test and learn about the emu pro, I put one in my Volvo 740 turbo and I quite happy with the pro. But there is one thing I can’t sorted out:
If I roll down to a crossroad and press the clutch and let the rpm reaches idle, everything is fine. If I then shift down while still rolling and clutch back in, the idle controller still stays in idle mode and because of the high rpm, the PID controller closes the ICV to the PID min limit value. If I set the PID min limit to low, the car dies if I stop and press the clutch again.
Am I overlooking something? A maximum rpm value to enter/exit the idle state? Ore maybe a combination of gear detection, clutch pressure, VSS sensor value to bring the idle state back to „armed“ if the ecu detects that the car still is in gear? (right now I didn’t set up the gear detecton)
I think the easiest way is, if it goes back to armed state if it overshoots the higher idle drop down rpm.
Tomorrow I can send a log of that problem, if that helps to understand the problem.
Hi, I am having a similar problem for quite a while now. I have a DBW setup with PID airflow control. When slowly changing gears the idle strategy kicks in and stays on. Until accelerator is pressed again. This means fuel is injected and I get big flames. Also the PID reduces airflow to minimum value. If I press the clutch at that moment the engine shuts off. Get in touch with Ecumaster support to report this problem.
If I understand your example correctly, the issue occurs during engine braking—when you’re using the engine to slow the car while it’s still in gear. If that’s the case, what do you have your overrun settings configured to? I’d be interested in taking a look at a data log if you’re willing to post one.
Hi,
We will be releasing a new version of EMU PRO next week.
It has changes to the idle strategy, like margins for PIDs and deactivation above a certain RPM.
It should solve all of the existing issues with idle in EMU PRO. We tested multiple problematic scenarios. Driving on idle under load (hill, braking), disengaging the clutch after engine braking, rpm increase during downshifts, and so on.
Hi bravo 685, this is not the problem. The problem is that once idle is active the only deactivation strategy is the accelerator. So when changing gears slowly without blipping the idle strategy will be active at for example 2500 rpm and try to correct to target idle rpm. When releasing the cluth the engine will shutt off, as the air flow pid won’t catch the sudden rpm drop.
We released an update with multiple changes to the idle system. It should solve all the issues we knew about. If you still have problems with idle in any situation, please let us know.
