GF54.30-P-3044CA Trip Computer, Function
GF54.30-P-3044CA Trip Computer, Function
MODEL 207.3/ 4
Function requirements, general
^ Circuit 15 ON
The circuit 15 status is sent by the electronic ignition lock control unit (N73) over the chassis CAN (CAN E) to the instrument cluster (A1).
Trip computer (TRIP) function, 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)
- "After 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 long-distance memory ("After reset").
The information "after start" or "after reset" is displayed in the multifunction display (A1p13) of the instrument cluster as follows:
- "Traveled distance"
- "Time elapsed"
- "Average consumption"
- "Average transportation speed"
The trip computer includes the following subfunctions:
^ Function sequence, travel distance display after start/after reset
^ Function sequence, time display after start/after reset
^ Function sequence for the average speed display
^ Function sequence for composite mileage display
^ Function sequence for ECO-Score display (driving style analysis) (as of 1.6.12)
^ Function sequence for remaining distance display
^ Function sequence for display reset
Function sequence for travel distance display after start/after reset
The travel distance is calculated on the basis of the wheel speeds.
The wheel speeds are recorded by the following components:
- Left front axle rpm sensor (L6/1)
- Right front axle rpm sensor (L6/2)
- Left rear axle rpm sensor (L6/3)
- Right rear axle rpm sensor (L6/4)
The Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS) or the Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS) reads in the signals of the rpm sensors and transmits these via the chassis CAN to the instrument cluster.
The instrument cluster calculates the traveled distance from the wheel speeds.
The travel distance "After start" is displayed in a range of 0 to 9999 km.
If a period of more than t = 4 h lies between the time when circuit 15 is switched off and then switched on again, then the "After start" odometer is automatically reset to 0.
If the odometer reading is between 6213 and 9999 and the distance unit is changed (e.g. from km to miles), the odometer will automatically be reset to zero. This reset remains active even if the unit is changed again.
Distance units are changed in the "set up" menu in the "instrument cluster" submenu. The distance unit can be changed from kilometers to miles in the "speedometer/travel distance display unit" display window.
The travel distance "After reset" is calculated in the same way as the travel distance "After start", though here the display takes place in a range from 0 to 99,999 km.
Depending on the setting in the instrument cluster and coding of the national version of the instrument cluster the travel distance is displayed in:
- Kilometers (e.g Economic Commission for Europe (ECE), Japan)
- Miles (e.g. USA, Australia)
When kilometers are switched over to miles, liters are also automatically switched over to gallons.
Function sequence, time display after start/after reset
With circuit 15 ON, the time after start is added up by means of a time counter. The display takes place in a range from 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 for the average speed display
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.
Depending on the setting (kilometers/miles) and the national variant coding of the instrument cluster the average speed is displayed in:
- km/h (kilometers per hour)
- mph (miles per hour)
Function sequence for composite mileage display
The trip computer calculates the fuel consumption using the following information:
- Consumption signal from CDI control unit (N3/9) (for diesel engine) or from ME-SFI [ME] control unit (N3/10) (for gasoline engine)
- Travel distance covered "After start" or "After reset"
Depending on the setting (kilometers/miles) and coding of the national version of the instrument cluster the fuel consumption is displayed in:
- l/100 km (liters per 100 kilometers)
- mpg (miles per gallon) or - km/l (kilometers per liter)
The relevant information is sent by the CDI control unit or the MESFI [ME] control unit via the chassis CAN to the instrument cluster.
Function sequence for ECO-Score display (driving style analysis) (as of 1.6.12)
The "ECO Score" display graphically displays the individual handling characteristics in the form of a bar graph.
The following information is displayed:
- Acceleration characteristic
- Uniform driving and coasting
- The mean value of the three disciplines yields the overall score
The information required for evaluation is sent by the CDI control unit or the ME-SFI [ME] control unit over the chassis CAN to the instrument cluster.
Function sequence for remaining distance display
The trip computer determines the expected range from the ratio between the current tank capacity and the average fuel consumption.
The current tank contents are recorded by the fuel level indicator sensor, left (B4/1) and fuel level indicator sensor, right (B4/2). The rear SAM control unit with fuse and relay module (N10/2) reads in the fuel level indicator sensor signals and forwards them over the interior CAN (CAN B) to the instrument cluster. The average fuel consumption is gathered from the short-distance memory or long- distance memory.
Function sequence for display reset
The TRIP computer is reset in the "Resetting values" menu by pressing the OK n/ (S110s6) in the left multifunction steering wheel button group (S110).
Here, the reset is only carried out for the currently displayed information.
The corresponding selection is read in by the steering wheel electronics (N135) and sent over the steering LIN (LIN E1) to the steering column tube module control unit (N80). The steering column tube module control unit routes the signals over the chassis CAN to the instrument cluster.
