A New Method to Calculate Instantaneous Vehicle Emissions using OBD Data CTL, Sapienza Univ. of Rome

Format:

Conference/Event

Author/Creator:

Ortenzi, Ortenzi, author.

Contributor:

Costagliola, Maria Antonietta

Conference Name:

SAE 2010 World Congress & Exhibition (2010-04-13 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

The actual type approval procedure of vehicles, based on a fixeddriving cycle for all the vehicles (NEDC), is not representative oftheir real on-road usage: the driving style and its influence onconsumption and emissions cannot be neglected. The on-road impactof vehicles on their real use is not known and it is difficult tomeasure (the PEMS are expensive, have big volume and mass and needcontinuous maintenance); the objective of this work is to develop amethodology to calculate in real time the energy and environmentalimpact of spark ignition vehicles, using the onboard sensors of thevehicle and emissions models to calculate them.An onboard instrumentation able to communicate with theelectronic system of the vehicle (OBD/CAN) was developed to collectall the sensor data installed on a vehicle: those values are usedas input values to the emissions models of CO₂, CO, HC andNOx developed in the present work. The CO₂ and CO havebeen calculated using a chemical equilibrium combustion model with6 combustion products, with the equilibrium temperature used as acalibration constant. HC and NOx, produced duringtransients, are assumed to be dependent from the accelerator pedalgradient, but during engine cold start also from the catalysttemperature.To validate the models, a spark ignition hybrid vehicle, theHonda Civic Hybrid has been tested on a chassis dynamometer runningthe three Artemis driving cycles. The emissions have been measuredwith the CVS (taken as reference) and with a portable emissionanalyzer, (Horiba OBS 1300), used for comparison with the models.The results shows that the values calculated by the models arecomparable with those measured by OBS, but for HC andNOx are better because the OBS gave inaccuracies due toits high minimum resolution

Notes:

Vendor supplied data

Publisher Number:

2010-01-1289

Access Restriction:

Restricted for use by site license