GF54.30-P-3044RC Trip Computer, Function

GF54.30-P-3044RC Trip Computer, Function

General function requirements
^ Circuit 15 On

Trip computer, general
The trip computer provides data and information on average fuel consumption, trip time, average speed, travel distance and remaining range.

The trip computer provides the following display screens:
- "After start" (short-distance memory)
- "SINCE RESET" (long-distance memory)

The information displayed refers to the point in time of the last reset of the short-distance memory ("After start") or of the longdistance memory ("After reset").

The information is displayed as follows in the instrument cluster (A1):
- Lower multifunction display (A1p15)
- selected display screen "AFTER START" or "AFTER RESET"
- distance driven "AFTER START" or "AFTER RESET"

- Upper multifunction display (A1p13)
- average transportation speed
- the time passed "AFTER START" or "AFTER RESET"
- Average consumption

The display screen is selected by scrolling with the scroll forward and back button (S110s1) and afterwards selecting with the system selection button (S110s3).

The trip computer is comprised of the following partial functions:
^ Function sequence, travel distance after start/after reset
^ Function sequence, time after start/after reset
^ Function sequence, average speed
^ Function sequence, average consumption
^ Function sequence, remaining range
^ Function sequence, reset

Function sequence, travel distance after start
The travel distance is calculated in the instrument cluster from the wheel speeds. The wheel speeds are recorded by the left front rpm sensor (L6/1), the right front rpm sensor (L6/2), left rear rpm sensor (L6/3) and right rear rpm sensor (L6/4) and by the ESP and BAS control unitN47-5.

The ESP and BAS control unit transmits the wheel speeds via the engine compartment CAN to the instrument cluster which calculates the travel distance from these. The travel distance after start is displayed in a range from 0 to 9999 km.
The travel distance is calculated analog to the travel distance after start, although here the display takes place in a range of 0 to 99 999 km.

Function sequence, time after start
With terminal 15 On the time after start is added up by means of a time counter. The display takes place over a range of 0 to 999 h and 59 min.
The time after reset is determined analog to the determination of time after start, although here the display takes place in a range of 0 to 9999 h and 59 min.

Function sequence, average speed
The trip computer calculates the average speed from the ratio between the travel distance driven and the time passed (trip time) since the last reset of the short-distance memory or long-distance memory. The travel distance is calculated in the instrument cluster from the wheel speeds.

Function sequence, average consumption
The trip computer calculates the fuel consumption from the following information:
- Consumption signal from motor electronics control unit ME (N3/10) via the engine compartment CAN
- Travel distance covered

Function sequence, range
The trip computer determines the expected range from the ratio between the current tank capacity and the average fuel consumption.
The trip computer receives the information as follows:
- The current tank capacity is recorded by the fuel level sensor (B4). The rear SAM control unit with fuse and relay module (N10/2) reads in the fuel level sensor and passes on the signal to the instrument cluster via the interior CAN.
- The average fuel consumption is obtained from the data from the short distance memory.

Function sequence, reset
The trip computer is reset by pressing the trip odometer reset button (A1s3) for t > 2 s.
In the process the reset is only designed for the currently displayed information.