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Engine Protection on Cummins INSITE Software (CUMMINS Engines)

Engine Protection

Figure 1.1 - Engine Protection (Cummins QSK50/60 CM850/CM2150)

#Feature Description
This feature monitors critical engine operating conditions such as coolant temperature, oil temperature, oil pressure, coolant level, intake air temperature, and intake manifold pressure. When an operating condition is outside of calibrated limits, a speed or fuel derate results. All calibrations except fire trucks and fire pumps include this feature.

In operation, the ECM monitors engine operating conditions while the engine is running. If one of the critical parameters exceeds the Engine Protection limit, as defined in the calibration, a derate occurs and a warning lamp is lit. The severity of the derate varies according to which engine operating condition has exceeded its Engine Protection limit.

Also, the severity of the derate may vary in relation to the severity of the event. For example, Intake Manifold Temperature that is slightly above a threshold for a short period of time will result in a mild derate. The purpose of the derate is to return intake temperature to a normal range. If the condition worsens, the derate will be more severe. If the condition persists or worsens, and Engine Protection Shutdown is enabled, the Stop lamp will flash to warn the operator of an impending shutdown event, and the engine will shutdown.

#Adjustable Parameters
Some of the parameters may not be available depending on the calibration.
Figure 1.2 - Engine Protection (QSB3.3 CM2150)

1). Engine Protection
The Engine Protection feature is either Enabled or Disabled by the calibration. This parameter can not be adjusted in INSITE™.

2). Shutdown
If enabled, engine shutdown occurs when low coolant level is detected. This prevents or limits engine damage if a derate does not return operating conditions to an acceptable range, as defined by the calibration. This will not be adjustable if a Coolant Level Sensor is Not Installed (refer to Figure 1.2 above).

3). Shutdown Manual Override
This option enables Engine Protection shutdown to be disabled by setting an OEM-installed manual override switch to the Override position.

Figure 1.3 - Engine Protection (Cummins Signature/ISX CM570)

4). Engine Protection Shutdown
If enabled, engine shutdown occurs if Engine Protection limits are exceeded. This prevents or limits engine damage if an Engine Protection derate does not return operating conditions to an acceptable range, as defined by the calibration.

5). Restart Inhibit or Limited Restart
If enabled, this option prevents the operator from restarting the engine after an Engine Protection shutdown, or will not be permitted, without first cycling the key switch to the OFF position.
Figure 1.4 - Engine Protection (Cummins ISL8.3 CM850)

6). Engine Protection Coolant Level Shutdown
The Engine Protection Coolant Level Shutdown is either Enabled or Disabled by the calibration. This parameter can not be adjusted in INSITE™.
Figure 1.5 - Engine Coolant Level (Cummins QSB3.9/5.9 CM2880)

7). Engine Protection Exhaust Stack Temperature 1 and 2 Torque Derate Enable
When either of these is enabled, the engine will experience a speed or torque derate if the temperature in the exhaust stack of either the Left (A) or Right (B) Bank exceeds the calibrated threshold. Engine shutdown may occur if a derate does not return operating conditions to an acceptable range, as defined by the calibration.

8). Switch Configuration
This parameter allows the user to select the type of override for the the engine protection override switch. There are two types of overrides:
  • Shutdown and Derate Override — the engine protection shutdown or derate can be temporarily overridden.
  • Shutdown Override — the engine protection shutdown can be temporarily be overridden.

9). Engine Coolant Level Shutdown Type
This parameter simplifies the multiplexing design of the coolant level shutdown by selecting what input defines whether a shutdown will occur with low coolant. This can be set to either Trim or Multiplexing. When set to Trim and a low coolant level is detected, the ECM will shutdown the engine if Shutdown is enabled. When set to Multiplexing, it will follow the commands from the module selected in the Source Address.

10). Source Address
This is the source address of the module that is sending messages across the datalink. This parameter can only be adjusted when Engine Coolant Level Shutdown Type is set to Multiplexing.

#Engine Protection Setting
1). Torque Derate
Figure 1.6 - Torque Derate
2). RPM Derate
Figure 1.7 - RPM Derate
3). ShutDown
Figure 1.8 - ShutDown

Engine Protection is designed to prevent engine damage when a sensor value exceeds a certain limit for critical engine operating parameters. The Engine Protection feature enables you to view the Engine Protection fault history associated with a specific Engine Protection fault.

A fault history log is provided for each Engine Protection parameter. The last five occurrences of each Engine Protection fault are displayed.

To view Engine Protection data:
1). Click Advanced ECM Data on the Viewbar. Read More: Advanced ECM Data on Cummins INSITE Software (CUMMINS Engines).
2). In the Advanced ECM Data window, select Engine Protection from the list of engine features.
3). Engine Protection data is displayed in the right side of the Advanced ECM Data window.
Figure 1.9 - Engine Protection

#Viewing Data 
Engine Protection fault history is displayed in an expandable/collapsible list. Newest to oldest fault occurrences are listed for each parameter. Related Engine Protection fault history data is displayed in the following columns:
  • Description - The Engine Protection parameter for which a fault was recorded.
  • Fault Code - The fault code number.
  • Occurrence - This can be one of five possible values: Newest, 2, 3, 4, or Oldest.
  • Value - The value of the Engine Protection parameter associated with the fault, at the time of the fault.
  • Duration - The duration of the Engine Protection fault in Hour:Minute:Second format.
  • ECM Time (Key On Time) - The time that the Engine Protection fault occurred.


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