Engine protection function

Under certain operating conditions, engine torque must be limited to prevent damage. Examples of protective functions:

Fig 1: Engine Protection Function (RPM) - Communication Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

• When driving at high altitudes, engine torque may be limited to prevent the turbocharger from overrevving.
• When the engine is cold, engine torque is limited to prevent engine damage.
• If there is a risk of overheating, engine torque is limited by restricting air mass and through fuel cut-off.
• Limitation of maximum permissible engine speed.