Experimental study on the emission characteristic of a methanol engine based on transient cycle WHTC

CATARC Automotive Test Center (Tianjin) CO., Ltd., Tianjin, 300300, China

^* Corresponding author: liujixu@catarc.ac.cn

Abstract

The emission characteristics of regulated emissions and unregulated emissions were studied under the full loads and the cold/hot transient cycle (WHTC) on a six-cylinder, multi-point injection, and spark ignition methanol engine. The results show that the emissions of THC and CO for the methanol engine is at a high level without three-way catalyst (TWC) and the emission of NO_X could be controlled at a lower level than 400 mg/kW·h with exhaust gas recirculation (EGR). The emissions of THC, CO and NO_X are low with TWC, whose weighted results under WHTC could be kept at a lower level than the limits in China VI Standard. It is a technical difficulty to control the emissions of methanol (CH₃OH) and formaldehyde (HCHO) for methanol engines, especially under the cold WHTC, there has a high risk for the emission of CH₃OH exceeding the limit of standard.