MSA12: Torque Limit Only Based on RPM?

Hi,

I logged some data the day before yesterday and confirmed again that my diode is too restricted.
At 3900 RPM, I'm only getting 808 mg/H instead of the full 847.9.

What raises my suspicion is the "drop" in the torque limit from 35.2 to 34.2 (with intermediate values of 34.8, 34.6, and 34.4) above 3200 RPM.

Is it really only dependent on the speed?

I already understand why the air mass is decreasing (Air Mass Value / Lift ≈ Air Mass Value Volts / RPM).

So, does that mean the 1Z (021 AF) starts to "detune" at 3200 RPM?

Okay, please provide the German text you would like me to translate into English. I will only provide the translation.

Oops.

I'll leave it as is, because the "throttling" might be of general interest.

But since I have a log entry showing that the desired mass flow rate (LMM) is 847.9 mg/h, and the measured torque has already dropped to 34.2, it can't be related to the air mass.


The question remains: why is the torque limit capped at a lower value, given the nearly parabolic speed curve?

Okay, please provide the German text you would like me to translate into English. I will only provide the translation.

dieselmartin wrote:

The question remains: why is the torque limit capped at the lower end, given the speed curve (which is almost a perfect parabola)?

Hi Martin,

The rotational speed is primarily a function of the RPM. The curve resembles the torque characteristic of the respective motor quite closely, including the derating range – where the rotational speed simply drops off sharply.

Depending on the software, ambient pressure can also play a role, at which point the entire process becomes a 3D keyframe animation.
x = speed (or rotational speed)
y = ambient pressure
z = set boundary.

The downward limitation is quite clear:
As the speed increases (above approximately 2000 rpm), the torque decreases.
If the speed decreases, then the torque increases .

Quote:

The capping downwards is quite clear: As the engine speed increases (above approximately 2000 rpm), the torque decreases. If the speed decreases, then the torque increases

.

This is a proportional description *without* any upper limit.

The speed increases from 3000 to 3900, but it starts decreasing at 3200, and the decrease is stopped at 3400, even though the speed continues to increase.

WHERE did you get the 2000 RPM from?
I'm not referring to the torque diagrams in the prospectus, but rather the torque limitation. And that limit is from 2000 (or even earlier) to 3200 at a flow rate of 35.2 mg/h, which means it's operating at "full capacity."

Okay, please provide the German text you would like me to translate into English. I will only provide the translation.

dieselmartin wrote:

The speed increases from 3000 to 3900, but at 3200, the process of reducing it begins, and at 3400, this reduction is stopped, even though the speed continues to increase. WHERE did you get the 2000 RPM from?

Hi Martin,

Sorry, I missed your last response.

Your torque curve data seems to contradict the software I'm familiar with; in those programs, the torque curve typically resembles known Nm curves.
-> Those who are familiar with the 1Z software, please feel free to reach out.

Alternatively, could you post a full-throttle log from approximately 1300 to 4500 RPM? That might show more details.