Cat® Fleet Onboard v3.x Configuration Guide Caterpillar

Trucks receive assignment messages from the office and show the assigned routes on the map to the operator. Then, the operator can follow the route to the assignment. While the truck is traveling, Fleet onboard also calculates and notifies the loading tool the expected time of arrival (ETA).

Self Assignment

If the truck enters a non-assigned loading waypoint and is configured to change state to loading, the truck will send a self assignment to the office. Also the truck cancels the previously assigned loader to the truck.

Expected Time of Arrival (ETA) of Assigned Empty Trucks

ETA Display

ETA is the time at which the truck is expected to arrive at a loader/excavator after traveling along the final road segment. Fleet onboard will notify the ETA to the assigned loader from time to time or when entering an assigned beacon.

Expected Travel Time (ETT) is the elapsed time before which the truck is expected to arrive at the Excavator after traveling along the final road segment. The Travel Progress Monitor and loading tool onboard displays should display the ETTs of trucks.

Note: This functionality requires that ETA is enabled in Cat MineStar Office. Consult Caterpillar to implement this functionality.

If the truck does not have working GPS, then the detection of the truck entering route waypoints is unreliable. The ETA or ETT should not be updated. The truck should be assumed to be traveling in accordance with the expected travel time.

A truck is to be removed from the list of incoming trucks for an Excavator whenever the following actions occur:

• The truck changes state to loading at that excavator or another Excavator.

• The truck goes on delay.

• The truck is reassigned to a different excavator.

• The truck appears to be so late that the truck is unlikely to arrive.

ETA Information in Assignment Messages

Empty Truck Assigned to an Excavator

The assignment message for an empty truck includes the following ETA information:

• The list of expected travel times between route waypoints. For example, if the list of waypoints is W1, W2, W3, W4, W5, W6, then the first entry in the list of expected travel times is the travel times from the dump to W1. The second entry in the list is the expected travel times from W1 to W2.

Peer to Peer Between an Empty Truck and an Excavator

Peer-to-peer is initiated between a truck and its assigned excavator when the truck enters the second last waypoint of the route provided for the assignment.

When ETT is enabled to provide ETT information to the loading tool, trucks will initiate peer to peer when the truck is initially assigned to the loading tool.

Additional peer-to-peer messages are sent whenever an updated ETT is to be communicated by the truck to the assigned loading tool.

In Cat MineStar Office, the following algorithm is used to determine "Truck Stopped?":

1. A truck is assumed to have stopped if the truck has not entered a waypoint more than 120 seconds after the truck was expected to enter the next assigned route waypoint.

2. A truck is assumed to be overdue if the truck has not entered a route waypoint more than 150% of the expected travel time of the current road segment after the truck entered the previous assigned route waypoint.

3. When a truck is overdue, the new ETA or ETT is assumed to be the old ETA or ETT plus 40% of the amount the truck is overdue on the current road segment. This calculation is to make an allowance for the fact that the truck may have just missed the assigned route waypoint.

4. New ETAs or ETTs for overdue trucks will be recalculated after each interval that is 50% of the expected travel time of the current road segment.

   For example, a truck is of the following factors:

   • Expected to arrive at the assigned excavator at 7:40:00 am.

   • Started traveling along the current road segment at 7:35:00.

   • Expected travel time for the current road segment is 60 seconds.

   The truck is therefore expected to enter the next route waypoint therefore at 7:36:00. If the truck does not enter the next route waypoint, then one of the following factors is assumed:

   • The truck is assumed to be overdue at 7:36:30 (7:36:00 + 50% of the expected travel time). The ETA is updated to 7:40:12 (7:40:00 + 40% of the time overdue which is 30 secs).

   • The truck is again assumed to be overdue at 7:37:00 (7:36:30 + 50% of the expected travel time). The ETA is updated to 7:40:36 (7:40:12 + 40% of the total time overdue which is 60 secs).

   • The truck is again assumed to be overdue at 7:37:30 (7:37:00+ 50% of the expected travel time). The ETA is updated to 7:41:12 (7:40:36 + 40% of the total time overdue which is 90 secs).

   • The truck will be assumed to have stopped at 7:38:00.