Abstract
Internal combustion engine emissions are a serious worldwide problem. To combat this, emission regulations have become stricter with the goal of reducing the proportion of transportation emissions in global air pollution. In addition, the European Commission passed the real driving emissions–light-duty vehicles (RDE-LDV) regulation that evaluates vehicle emissions by driving on real roads. The RDE test is significantly dependent on driving conditions such as traffic or drivers. Thus, the RDE regulation has the means to evaluate driving dynamics such as the vehicle speed per acceleration (v·apos) and the relative positive acceleration (RPA) to determine whether the driving during these tests is normal or abnormal. However, this is not an appropriate way to assess the driving dynamics because the v⋅apos and the RPA do not represent engine load, which is directly related to exhaust emissions. Therefore, in the present study, new driving dynamic variables are proposed. These variables use engine acceleration calculated from wheel force instead of the acceleration calculated from the vehicle speed, so they are proportional to the engine load. In addition, a variable of driving dynamics during braking is calculated using the negative wheel force. This variable can be used to improve the accuracy of the emission assessment by analyzing the braking pattern.
Highlights
Greenhouse gas and air pollutant emissions are two of the most important issues currently discussed in the automotive market
The present study suggests a new method to estimate driving dynamics during braking that can be used to analyze the effect of the braking pattern on exhaust emissions
The driving dynamics of the vehicle were analyzed by calculating the v·apos and relative positive acceleration (RPA) according to the method suggested by RDE
Summary
Greenhouse gas and air pollutant emissions are two of the most important issues currently discussed in the automotive market. Particulate matter and nitrogen oxide are mainly emitted from road transport sources and are key reasons for establishing strict regulatory policies on exhaust and greenhouse gas worldwide [1,2,3]. These regulatory policies have encouraged the development of emission-reduction technologies for automobiles. They could not prevent the use of a special software that could detect emission test mode and change its driving pattern to meet emission levels [4]. The European Union has developed and applied the real driving emission–light-duty vehicles (RDE-LDV) test method that measures and evaluates exhaust while driving on actual roads
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