Torque monitoring protects drivetrain components by validating that estimated engine torque is consistent with allowed limits. Modern ECUs cross-check multiple torque pathways to detect manipulation or mechanical anomalies.

Overview

The ECU compares requested torque, modeled torque and measured torque proxies (airmass, injection quantity) to detect discrepancies.

Controlled Signals

• IQ request
• Air mass
• Boost pressure
• Rail pressure
• Driver wish torque

Maps Involved

• Driver Wish
• Torque Limiters (gear, temperature, smoke)
• Smoke Model → load estimation
• Engine Efficiency Maps

ECU Logic

Driver Wish → Torque Request
       ↓
Torque Limiters Applied
       ↓
Torque Model (airmass, fuel, pressure)
       ↓
Torque Monitoring Cross-Checks
       ↓
If mismatch → Limp Mode

Calibration Objectives

• Avoid false torque deviation trips
• Maintain consistent torque pathways
• Ensure safe mechanical loads

Calibration Strategy

• Harmonize torque limiters before raising torque
• Avoid breaking relationship between airflow and IQ
• Correct smoke model early in the process

Diagnostics

• P061B / P06xx torque correlation faults
• Airflow-to-IQ mismatch
• Smoke model inconsistent values

Best Practices

• Consistency beats peak torque
• Validate torque model under transient conditions