Request: MAP value at Turbo Closed-loop control is started
Posted: Sun Oct 15, 2017 7:53 am
Serious request: I hope to freely set the MAP value at which Turbo Closed-loop duty control will be started.
The trigger MAP value at which Closed-loop duty control begins is fixed at 100 kPa and can not be changed by the user.
Even when the MAP value is less than 100 at high rotation & throttle small opening, the pressure upstream of the throttle may be higher than the pressure at which the Actuator valve is released.
I measured the pressure with a MAP sensor attached to the intercooler located upstream of the throttle.
See Pic. [Closed-loop control problem] which is log of Closed-loop control.
IC Boost = Pressure pressure upstream of throttle
My turbine's actuator is set to keep a pressure of 142 kPa when Boost duty is 0.
When closed-loop control is set, if the pressure downstream of the throttle is less than 100 kPa, Boost duty = 0 and the pressure inside the intercooler can not be 142 kPa or more.
Therefore, I actually verified that the boost rise might be inferior to the open-loop control in some cases.
See Pic. [Turbo-Open and Closed-loop -Comparison]
It is a comparison between Open-loop and Closed-loop
Left: Correlation between throttle opening% and pressure upstream of throttle
Right: Correlation between throttle opening% and Boost duty
Using Closed-loop control,I want to enjoy the best engine performance at all engine speeds and all accelerator opening degrees.
So, I strongly strongly hope that the user can freely set the MAP value at which Closed-loop control will start work.
Please add [Closed-loop control start MAP value] setting by all means.
The trigger MAP value at which Closed-loop duty control begins is fixed at 100 kPa and can not be changed by the user.
Even when the MAP value is less than 100 at high rotation & throttle small opening, the pressure upstream of the throttle may be higher than the pressure at which the Actuator valve is released.
I measured the pressure with a MAP sensor attached to the intercooler located upstream of the throttle.
See Pic. [Closed-loop control problem] which is log of Closed-loop control.
- Closed-loop control problem
- Turbo-Close-loop-Prb.jpg (69.54 KiB) Viewed 308 times
My turbine's actuator is set to keep a pressure of 142 kPa when Boost duty is 0.
When closed-loop control is set, if the pressure downstream of the throttle is less than 100 kPa, Boost duty = 0 and the pressure inside the intercooler can not be 142 kPa or more.
Therefore, I actually verified that the boost rise might be inferior to the open-loop control in some cases.
See Pic. [Turbo-Open and Closed-loop -Comparison]
It is a comparison between Open-loop and Closed-loop
Left: Correlation between throttle opening% and pressure upstream of throttle
Right: Correlation between throttle opening% and Boost duty
- Turbo-Open and Closed-loop -Comparison
- Turbo-Open and Closed-loop -Comparison2.jpg (945.58 KiB) Viewed 308 times
So, I strongly strongly hope that the user can freely set the MAP value at which Closed-loop control will start work.
Please add [Closed-loop control start MAP value] setting by all means.