RDE Plus - A Road to Rig Development Methodology for Whole Vehicle RDE Compliance: Overview 2020-01-0376
To aid Original Equipment Manufacturers (OEM) in meeting Real Driving Emissions (RDE) regulation criteria across the extended boundary conditions of temperature, altitude and driving style, an integrated Road to Rig (R2R) whole vehicle development, calibration and verification approach known as RDE Plus (RDE+) has been developed by HORIBA MIRA.
Encompassing testing on the road, chassis dynamometer, Engine-in-the-Loop (EiL) and virtual testing methodologies, OEMs will be able to deploy real world driving scenarios further upstream during vehicle and engine development programmes; hence reduce development timescales and costs that will otherwise inevitably increase due to RDE regulations.
Reported in the current paper is a brief introduction to the baseline RDE road tests followed by replication of several real RDE cycles that cover the RDE extended boundary conditions with the vehicle driven by a robot driver on the chassis dynamometer. Altitude and temperature requirements were fulfilled using a HORIBA Multi-function Efficient Dynamic Altitude Simulation (MEDAS) system with driving style parameterised according to the RDE regulation parameter va_pos as a percentage of its limit. For all routes, there was an excellent correlation in vehicle and engine performance as well as gaseous emissions.
Following the road to chassis correlation, the engine was removed from the test vehicle and installed on an engine testbed to perform the same RDE cycles. A good correlation in engine performance and emissions between road, chassis dynamometer and EiL was demonstrated. Using a virtual toolset encompassing a virtual vehicle (the same as physically tested) and virtual driver, the effects of driving style on engine performance and emissions were investigated. The methodology for parameterising the driver model and engine results from different driving styles are reported in the current paper.
This paper is the second in a series of ongoing technical reports from HORIBA MIRA on vehicle and engine development and calibration methodologies for RDE compliance and follows SAE Technical Paper 2019-01-0756 presented at WCX2019.
Philip Roberts, Alex Mason, Steve Whelan, Kunio Tabata, Yosuke Kondo, Tatsuki Kumagai, Richard Mumby, Luke Bates