1.内燃机可靠性国家重点实验室，山东 潍坊 261061；
2.潍柴动力股份有限公司，山东 潍坊 261061
Abstract：Based on the analysis of the market feedback that the natural gas heavy truck generally has the problem of starting in cold winter, it is determined that the main reason for this problem is that there is too much residual water vapor in the engine cylinder and the spark plug cannot ignite due to condensation and icing. An automatic exhaust control strategy of natural gas engine idle and shutdown is designed. The real vehicle test results show that under the same conditions, the restart success rate of the same vehicle is significantly improved. The natural gas engine shutdown idle automatic exhaust control strategy is practical and feasible, which also provides a reference for solving the same type of faults.
Keywords:natural gas engine; spark plug icing; control strategy