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International Journal of Automotive Technology > Volume 19(3); 2018 > Article
International Journal of Automotive Technology 2018;19(3): 509-521.
doi: https://doi.org/10.1007/s12239-018-0049-5
SLOPE SHIFT STRATEGY FOR AUTOMATIC TRANSMISSION VEHICLES BASED ON THE ROAD GRADIENT
Fanjing Meng, Hui Jin
Beijing Institute of Technology
ABSTRACT
Motivated by the development of high-precision digital maps for advanced driver assistance system (ADAS) in recent years, this study provides a new approach to solve the problems of the conventional automatic transmission vehicle travelling on sloping roads. Based on vehicle dynamics, shift problems on hilly roads are analyzed. A novel intelligent shift strategy is proposed, which consists of a dynamic shift schedule for the uphill, a safety shift schedule for the downhill, and a comprehensive economical shift schedule for the gentle slopes. A set of driver-in-loop co-simulation tests was conducted in a driving simulator that is equipped with a MATLAB/Simulink dynamics simulation platform. The test results verified the effectiveness of the new intelligent shift strategy. With the road information provided by a high-precision digital map, busy shifting can be eliminated, and improved dynamic performance can be achieved for a vehicle travelling on the uphill roads; undesired upshift can be prevented, and engine traction resistance can be used to relieve the load of braking system when a vehicle travelling on the downhill roads; also, fuel consumption can be reduced for a vehicle travelling on a gently sloped road. Consequently, this novel intelligent shift strategy offers a reliable and effective solution for improving a vehicle’s driving performance on a hilly road.
Key Words: Automatic transmission vehicle, Vehicle dynamics, Shift problems on hilly roads, Intelligent shift strategy on slopes, Simulation analysis
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