InstantantFuelEconomy
Full qualified VSS Path: Vehicle.Powertrain.FuelSystem.InstantantFuelEconomy
Description: Real-time instantaneous fuel economy calculated over a short time window.
Comment: This value represents the current fuel efficiency at any given moment during vehicle operation. It is calculated based on the distance traveled and fuel consumed over a brief sampling period (typically around 500ms). The calculation compares the vehicle state before and after the sampling window to determine instantaneous efficiency. This metric refreshes frequently and can fluctuate significantly based on driving conditions, acceleration, and terrain. Unlike average fuel economy measurements, this provides immediate feedback on current driving efficiency.
flowchart LR Vehicle-->Powertrain Powertrain-->FuelSystem FuelSystem-->InstantantFuelEconomy

Eclipse Leda: Usage Example

In Eclipse Kuksa.VAL Databroker CLI:

$ databroker-cli
sdv.databroker.v1 > connect
[connect] OK
sdv.databroker.v1 > get Vehicle.Powertrain.FuelSystem.InstantantFuelEconomy
[get]  OK
Vehicle.Powertrain.FuelSystem.InstantantFuelEconomy: ( NotAvailable )
sdv.databroker.v1 > set Vehicle.Powertrain.FuelSystem.InstantantFuelEconomy 0
[set]  OK

Digital Auto: Playground

playground.digital.auto provides an in-browser, rapid prototyping environment utilizing the COVESA APIs for connected vehicles.

Vehicle Model Direct link to Vehicle Signal
ACME Car (EV) v0.1 Vehicle.Powertrain.FuelSystem.InstantantFuelEconomy

Data Type & Unit
Path Vehicle.Powertrain.FuelSystem.InstantantFuelEconomy VSS: Addressing nodes
Data type float VSS: Datatypes
Unit km/l VSS: Units
Label kilometers per liter
Description Distance per volume measured in kilometers per liter VSS: Sensors & Actuators
Domain distance-per-volume

Note: The float datatype is a floating point number which technically allows values between -3.4e ^ -38 and 3.4e ^ 38

Signal Information

The vehicle signal Vehicle.Powertrain.FuelSystem.InstantantFuelEconomy is a Sensor.

The vehicle signal Vehicle.Powertrain.FuelSystem.InstantantFuelEconomy is a Signal.

UUID

Each vehicle signal is identified by a Universally Unique Identifier (UUID)

The UUID for Vehicle.Powertrain.FuelSystem.InstantantFuelEconomy is 209ef58ef2be561c98d19e3e92982223

Feedback

Do you think this Vehicle Signal specification needs enhancement? Do you want to discuss with experts? Try the following ressources to get in touch with the VSS community:
Enhancement request Create COVESA GitHub Issue
Join COVESA www.covesa.global
Discuss VSS on Slack w3cauto.slack.com
VSS Data Experts on Google Groups covesa.global data-expert-group

About VSS

The Vehicle Signal Specification (VSS) is an initiative by COVESA to define a syntax and a catalog for vehicle signals. The source code and releases can be found in the VSS github repository.

Supported datatypes

The following is a list of VSS supported built-in datatypes:

Name Type Min Max
uint8 unsigned 8-bit integer 0 255
int8 signed 8-bit integer -128 127
uint16 unsigned 16-bit integer 0 65535
int16 signed 16-bit integer -32768 32767
uint32 unsigned 32-bit integer 0 4294967295
int32 signed 32-bit integer -2147483648 2147483647
uint64 unsigned 64-bit integer 0 2^64 - 1
int64 signed 64-bit integer -2^63 2^63 - 1
boolean boolean value 0/false 1/true
float floating point number -3.4e -38 3.4e 38
double double precision floating point number -1.7e -300 1.7e 300
string character string n/a n/a

Min, max and default values defined in a Vehicle Signal Specification must be in the supported range of the data type.