Data naming conventions

This section describes the data naming convention used in CO₂MPAS input template to construct the data-values tree, i.e. the input of the simulation model. There are two naming conventions in the excel file:

• the sheet-name name is composed of 5 parts, all optional, but at least one of the first 4 must be present:

              base.input.precondition.WLTP-H.ts
              └┬─┘ └─┬─┘ └────┬─────┘ └─┬──┘ └┬┘
  scope────────┘     │        │         │     │
  usage──────────────┘        │         │     │
  stage───────────────────────┘         │     │
  cycle─────────────────────────────────┘     │
  sheet_type(optional)────────────────────────┘
  

• the data-name consists of 5 parts, the parameter part is mandatory, and the last 2 parts can be reversed:

                 plan.target.prediction.vehicle_mass.WLTP-H
                 └┬─┘ └─┬─┘ └────┬────┘ └────┬─────┘ └──┬─┘
  scope(optional)─┘     │        │           │          │
  usage(optional)───────┘        │           │          │
  stage(optional)────────────────┘           │          │
  parameter──────────────────────────────────┘          │
  cycle(optional)───────────────────────────────────────┘
  

Note

• The dot(.) may be replaced by space.

• The usage and stage parts may end with an s, denoting plural, and are not case-insensitive, e.g. Inputs sheet.

Description of the name-parts

The options of each name part are described in the following sections.

scope

• base [default]: input to CO₂MPAS simulation model.

• dice: input for dice.

• meta: meta data of the vehicle test.

• plan: data used to run a simulation plan and overwrite the inputs of the simulation model.

usage

• input [default]: input to calibration and/or to prediction models.

• data: intermediate data between calibration and prediction models (see :ref: model).

• output: CO₂MPAS precondition, calibration, and prediction results.

• target: reference-values (NOT USED NEITHER IN CALIBRATION NOR IN PREDICTION) to be compared with the CO₂MPAS results.

stage

• calibration [default]: calibration data.

• prediction [default, if cycle in nedc]: prediction data.

cycle

• nedc-h: NEDC High cycle data.

• nedc-l: NEDC Low cycle data.

• wltp-h: WLTP High cycle data.

• wltp-l: WLTP Low cycle data.

• nedc [default]: shortcut to set values for nedc-h & nedc-l.

• wltp [default]: shortcut to set values for wltp-h & wltp-l.

• all-h: shortcut to set values for nedc-h and wltp-h.

• all-l: shortcut to set values for nedc-l and wltp-l.

• all: shortcut to set values for nedc and wltp.

param

Any data-name (e.g. vehicle_mass) used in the physical model.

sheet_type

There are three sheet types, which are parsed according to their contained data:

• pl [parsed range is #A1:__]: table of scalar and time-depended values used into the simulation plan as a variation from the base model.

• pa [parsed range is #B2:C_]: scalar or not time-depended values (e.g. r_dynamic, gear_box_ratios, full_load_speeds).

• ts [parsed range is #A2:__]: time-depended values (e.g. times, velocities, gears). Columns without values are skipped. COLUMNS MUST HAVE THE SAME LENGTH!

Note

If it is not defined, the default value follows these rules: When scope is plan, the sheet is parsed as pl. If scope is base and cycle is missing in the sheet-name, the sheet is parsed as pa, otherwise, it is parsed as ts.

Simulation plan

Variations to the base model must be inserted in the provided additional sheets, characterized by the plan. prefix. These sheets consist of tables composed by rows, each row is a single simulation, and columns, the parameters that the user wishes to vary; the columns can contain the following special names:

• id: Identifies the variation id.

• base: It is the file path of a CO2MPAS excel input. The data are used as new base vehicle.

• run_base: If TRUE [default] the base model results are computed and stored, otherwise the data are just loaded.