Study On Powertrain Shift Schedule Calibration Based On Driving Cycles

Driving cycles test and design on wheeled vehicles are studied many times at homeand abroad. However, driving cycles test and design on tracked vehicles are not. Asdevelopment of technology, vehicle performance is required not only on power, but also oneconomy and driving control. It is necessary to improve the calibration process and launchthe driving cycle tests on tracked vehicles. Besides, after the match calculations of thetracked vehicle’s power and economic parameters, it needs many real road tests, whichwastes time and funds. Considering the factors of the drivers and environment, the tests arenot repeated and the results are not compared. So it is necessary to develop the calibrationtest of tracked vehicle’s power and economic parameters on driving cycles.The calibration process of tracked vehicle’s control system is arranged and sometypical links of the systems are studied. After the match calculations of the trackedvehicle’s power and economic parameters, the power and economic shift schedules of thepowertrain are calculated. Then they are optimized on the combined simulation platformbasing HLA/RTI technology. The time of0~32km/h test reduces1.68s. The consumptionof the driving cycle test reduces10.88%. A driver assistant system and a data acquisitionsystem are developed. The driver assistant system consists of resistance moment loadingmodule and autopilot module. The resistance moment loading module calculates theresistance moment according to the velocity and grade degree of the driving cycle, thentransfers the moment to the dynamometer to simulate the real driving conditions. Theautopilot module calculates the accelerator position after the PID operation of thedifference between the real velocity and the target velocity, then transfers the value to theintegrated control unit. The data acquisition system collects the engine’s torque, thedynamometer’s torque and other condition parameters. At last the bench tests are launchedbased on the typical driving cycle. It shows that the driving cycle test consumption of theoptimized shift schedule is less21.69%than the one of the raw shift schedule. Meanwhile,the difference between the real velocity and target velocity varies between-3km/h and3km/h.In short, arranging the calibration process and studying the typical links of the powertrain integrated control system are instructive in developing the integrated controlsystem. The study on the shift schedule calibration for the powertrain based on drivingcycle is realistic. The driver assistant module owns a good result following the drivingcycle and has good practical value.