Development of two-speed dual-clutch transmission for seamless gear shifting in EVs

Review of the Methods to Optimize Power Flow in Electric Vehicle Powertrains for Efficiency and Driving Performance

“…-Shifting mechanism was not explained in details. The latest works related to gearshifting mechanism and its control are described in [41][42][43][44][45][46][47][48][49][50]. Researchers in [41][42][43] argued that criteria for the EV motor to operate efficiently is not just the application of the multispeed discrete transmission but also smooth gearshifting process with minimum jerking and actuation power usage.…”

“…Thus, detailed study in this aspect is crucial to quantify its long-term operation. Further studies on optimizing the gearshifting mechanism were explained in [49], in which the application of torque sensor was proposed in a two-speed DCT so that precise clutch engagement force can be regulated to fit the desired clutch torque for optimum shift quality. The torque sensor allowed precise real time torque measurement which is crucial to regulate the clutch engagement for optimum engagement time with minimum jerking.…”

“…A summary of the works related to the gearshifting mechanisms and the adaption of driver behaviors in [41][42][43][44][45][46][47][48][49][50][51] is presented in Table 3. In terms of gearshifting mechanisms, the works reviewed here mostly discussed their standalone performance in terms of jerking and shifting time, while limited discussions were carried out to evaluate their performance when integrated in a powertrain system.…”