US EPA

5934724 

Meetings & Symposia 

Bharat stage VI emission challenges transition from test bed to real world vehicle emission compliance 

Kusumba, M; Hadl, K; Graf, G 

2018 

FISITA 

37th FISITA World Automotive Congress 2018 

2018-October 

English 

The introduction of the Bharat Stage VI regulation emphasizes the robustness requirements of a complex emission reduction system (engine and EAS) at the end customer usage over the whole useful life of the vehicle. This is caused due to warranty targets, annual PEMS testing (ISC) and an OBD system being active over the whole vehicle life. Besides the legal requirements the most important factor for the engine architecture are the market demands. It seems that in the Indian market the purchasing price is even more important than in other representative markets such as EU, US or China, which contains the risk that the product quality and the robustness is affected by choosing low price technologies exclusively. The final hardware definition requires consideration of the end customer usage enabling a reliable system definition with reasonable cost and a high potential to meet 2023 legislation without any major hardware modifications. The majority of the investigations regarding aftertreatment system layout by Tier1 suppliers are currently focusing on the legal test cycles, mainly on the WHTC. Although the WHTC does represent well the usage of a N3 class vehicle it does not cover vehicles which are purely used under urban and sub-urban driving conditions. Due to the necessity to use a diesel particulate filter (DPF) to comply with particulate number limits the usage profile has a strong impact on the aftertreatment specification. The boundaries for the aftertreatment specification for urban applications differ significantly from those of a long haulage truck. Low load conditions under urban operation demand more frequent active DPF regeneration compared to operation in the WHTC mode, thus causing high thermal stress on the aftertreatment catalysts leading to degradation of their emissions reduction functionality. The paper will focus on the challenges of Bharat Stage VI 2023 emission compliance over the useful life, especially under real world driving conditions. © 2018 FISITA. All rights reserved. 

BS VI; Emission; Emission compliance; Exhaust aftertreatment systems; ISC; Legislation; OBD; PEMS testing; Real world driving conditions; Useful life; Commerce; Emission control; Engines; Laws and legislation; Neutron emission; Particles (particulate matter); Sales; Specifications; Vehicles; Aftertreatment systems; Diesel particulate filters; Emission compliance; Emissions reduction; Exhaust aftertreatment; Hardware modifications; Real-world drivings; Useful life; Air pollution control equipment