A design method for shift schedule of super multi-gear automatic transmission

Abstract

The invention discloses a method for designing a shift schedule of a super multi-gear automatic transmission, and relates to the technical field of transmission control. The method includes acquiring people-vehicle-road system information, determining the target gear according to the dynamic speed ratio adjustment method based on the vehicle speed and the throttle opening, determining the highest gear on the current slope according to the current system information, and taking the highest gear on the current slope and the target gear The lower gear in four steps as the final gear. Taking the best power performance of the whole vehicle as the design goal, the shift schedule of the super multi-gear automatic transmission is designed. On the premise of ensuring the vehicle's climbing performance, the gear shift is performed near the maximum power point of the engine to ensure that the vehicle has sufficient The acceleration performance, in which the shifting types include sequential shifting, skipping and gear holding, the automatic switching of the three shifting types can reduce the number of shifts, reduce the loss of shifting, and ensure that the transmission gear can follow the change of vehicle speed in real time.

Description

technical field [0001] The invention belongs to the technical field of transmission control, and more precisely, the invention relates to a design method for a shift schedule of a super multi-gear automatic transmission. Background technique [0002] Military vehicles often drive in harsh environments. Faced with steep slopes and continuous potholes, the vehicle transmission system must provide sufficient traction. At this time, the vehicle transmission needs to switch gears in real time according to the road conditions. The more gears in the transmission, the better the vehicle adapts to the road conditions. The higher the capacity, the better the operating point of the engine. Continuously variable transmission can change the transmission ratio according to the road conditions in real time, but the load capacity of the continuously variable transmission is weak, the work reliability is low, and it cannot be used for military vehicles with heavy load and harsh working envir...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems that the shift schedule of the super-multi-gear automatic transmission is complex, and the shift schedule of ordinary transmissions cannot be applied to the super-multi-gear automatic transmission. On the basis of the dynamic speed ratio adjustment method, a A super multi-gear automatic transmission shift schedule, which can change the transmission gear in real time according to the road conditions to achieve the best vehicle dynamics

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