摘要：To solve the cycle shifting problem caused by double-parameter shifting schedule on the rough road, it is need to recognize rough road and then take corresponding control strategy. Firstly, vehicle longitunal dynamic on rough road is analyzed, which verified the possibility using longitudinal acceleration to recognize rough road. Then longitudinal acceleration expressions on the rough road are analyzed, which proves the turbine speed change rate is effective on rough road recognition, and time domain analysis of turbine speed change rate is done. With the above analysis, a method combined with frequency of turbine speed change rate passing through the limits and receding horizon is used to recognize rough road. Finally, the fixed method of shift schedule on rough road is proposed based on the above passing through frequency, and control strategy of automatic transmission under the condition of road recognition is also given. Road experiments show that road roughness is effectively recognized and cycle shifting problem can be effectively solved.
