TOPICS

Urban off-cycle NOx emissions from Euro IV/V trucks and buses

Analyzes the causes of high off-cycle NOx emissions from Euro IV/V heavy vehicles that threaten efforts to improve urban ambient air quality in Europe and in other countries that use the Euro regulation as a pattern, and recommends various...

Discrepancies between type-approval and real-world fuel consumption and CO2 values in 2001-2011 European passenger cars

This paper compares fuel consumption / CO2 values of passenger cars from different sources and aims at quantifying the discrepancy between laboratory type-approval values and real-world values, including a retrospective analysis for the years 2001-...

In-use Testing for CO2 and Fuel Economy in the United States

  This working paper, available in English and Chinese, provides an overview of existing in-use testing for CO2 and fuel economy programs in the United States in order to inform the development of a Chinese program.

Certification procedures for advanced technology heavy-duty vehicles

Summarizes and evaluates approaches to testing and certifying power-train systems and complete vehicles.

Inertia classes, vehicle emissions tests, and the dead hand of the past

Vehicle test mass definition and inertia mass step-less approach

This paper is ICCT’s 4th contribution to the UNECE GRPE informal subgroup on the development of a worldwide harmonized light vehicles test procedure (WLTP-DTP).

Focus on inertia classes

This paper presents new analysis on the implications of the current inertia class based system and outlines two alternative approaches for discussion within the WLTP-DTP working group.

Inertia classes proposal

Builds on more detailed explanations in past WLTP doucments and presents, for discussion, a proposal for defining inertia classes for the WLTP GTR.

Inertia classes in worldwide harmonized light vehicle test procedure (WLTP) development

This paper was submitted to the UNECE GRPE informal subgroup on the development of a worldwide harmonized light vehicles test procedure (WLTP-DTP) on the issue of inertia classes to be used in the development of the WLTP.

Test cycles used to evaluate vehicle efficiency

Surveys the range of test cycles used to evaluate the efficiency of vehicles—including passenger cars and trucks, motorcycles, heavy-duty trucks and buses, and marine vessels—in order to inform ICAO discussion of a CO2 certification...