Research on NOX Emissions from Heavy Duty National Ⅵ Diesel Vehicle Aftertreatment Faults
Based on in vehicle emission testing portable emission measurement system(PEMS),a simulated emission test is conducted on sensors and deteriorated components of a National Ⅵ heavy-duty diesel vehicle in use.The test results show that the failure of the upstream temperature sensor and selective catalytic reduction(SCR)temperature sensor,as well as the deterioration of exhaust gas re-circulation(EGR)and inter cooler,can significantly worsen the vehicle's nitrogen and oxygen emissions,exceeding the standard emission limit.The failure of the diesel particulate filter(DPF)upstream temperature sensor can cause the nitrogen and oxygen emissions to exceed the limit,but the impact is relatively small.However,the failure of the downstream temperature sensor of nitrogen and oxygen will not cause the vehicle's emissions to exceed the limit.At the same time,the on-board diagnostics(OBD)system can effectively identify vehicle faults and give an alarm.
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