TDI quantity limits

All previous TDI engines, whether old or new, operate in a similar way regarding torque regulation.

Older engines (1Z, AFN, AHF, etc.) use mass-based measurements (mg/H, measurement block , while newer engines use torque-based measurements (Nm, measurement block 8 or various values in the extended measurement blocks).

In this process, the accelerator pedal specifies an injection amount or a desired torque, which is then limited to a value 'x' based on certain operating conditions.
- Limitation due to air mass/smoke, either based on the actual air mass or intake manifold pressure.
- Limited by the torque of the transmission (for manual transmissions), while automatic transmissions may have multiple values.
- Limitation due to maximum coupling torque (typically not utilized or a fixed value).
- Limitation due to additional safety mechanisms, e.g., caused by excessively high exhaust gas temperature (multiplication factor).

Under full throttle and a regulated load condition, the lowest limiting factor should be the transmission torque.

Quote:

Limitation due to additional protective mechanisms, e.g., due to excessively high exhaust gas temperature (multiplication factor).

Hi Rainer,

Similar protection mechanisms also exist as absolute value limiters, for example: fuel temperature (in the high-pressure pump), ambient air pressure (used to determine air density, which is a factor in cooling system design), etc.

Correct, it was just a specific example that caught my eye.