国六柴油机进气流量控制策略优化

郭冬雪，潘伟，庄明超，李静静，张成伟

潍柴动力股份有限公司，山东 潍坊  261061

摘要：为解决国六柴油车进气流量（mass air flow，MAF）传感器测量偏差引起的误判，分析MAF测量原理及控制逻辑，进行台架试验和故障车辆实际路谱分析;选择颗粒捕集器再生工况对MAF传感器与进气压力传感器（barometric pressure sensor，BPS）进行校验，优化MAF的控制逻辑。对优化后的MAF控制逻辑进行实际运行验证。结果表明：MAF测量偏差是引起车辆动力不足等故障的原因。MAF控制逻辑优化后，由MAF传感器测量偏差引起的误判故障率从31.9%降低到3.3%。该控制策略能有效解决由MAF传感器测量偏差引起的误判故障，提高发动机可靠性。

关键词：国六柴油机；EGR；MAF；BPS；控制策略

Optimization of control strategy of intake flow for CHINA Ⅵ diesel engine

GUO Dongxue, PAN Wei, ZHUANG Mingchao, LI Jingjing, Zhang Chengwei

Weichai Power Co., Ltd., Weifang 261061, China

Abstract：In order to solve the misjudgment caused by the measurement deviation of the mass air flow (MAF) sensor of the CHINA Ⅵ diesel vehicle, the MAF measurement principle and control logic are analyzed, and the bench test and the actual road spectrum analysis of the faulty vehicle are carried out. The regeneration condition of the particle trap is selected to verify the MAF sensor and the intake pressure sensor, and optimize the control logic of the MAF. The optimized MAF control logic is verified by actual operation. The results show that the measurement deviation of MAF is the reason of vehicle power shortage. After the optimization of MAF control logic, the misjudgment failure rate caused by MAF sensor measurement deviation is reduced from 31.9% to 3.3%. This control strategy can effectively solve the misjudgment failure rate caused by MAF sensor measurement deviation.

Keywords:CHINA Ⅵ diesel engine; EGR; MAF; BPS; control strategy