Tula Dynamic Motor Drive Chevy Bolt First Test: Applying “Cylinder-Deactivation” Tech To EVs

is similar, but instead a software solution for electric motor powertrains that sends higher, more efficient bursts of electric current to a motor that are interspersed with zero-current"rest periods" to achieve the required torque delivery with improved efficiency.Tula's combustion DSF/DFM systems have proven smooth and reliable in over a million V-8 Chevy and GMC trucks so far.

DMD can modulate the torque pulsation independent of vehicle or motor speed and hence can strive to avoid bothersome or resonant frequencies. For example, humans typically find vibration frequencies between 0.2 and 20 Hz noticeable and bothersome, while the resonant frequencies of steering wheels and seat tracks falls in the 63-77 Hz range and around 87 Hz respectively.

That said, someone who wasn't straining to sense vibration on our drive may never have done so, especially as road vibrations easily cover them up on most surfaces . It's also worth noting that DMD also increases efficiency during regenerative braking to optimize energy recovery, and that vibration was far less noticeable during deceleration. And this prototype vehicle hasn't undergone the extensive algorithm tuning a production fitment would get.

recently released under the name"current-excited synchronous motor." By eliminating permanent magnets, such motors can save between $250-$300, but at some cost to efficiency.The easiest way to improve efficiency of any electric motor is by switching to a silicon-carbide inverter, but these add cost.

Tula Technology is currently demonstrating its Bolt EV prototypes to OEMs and suppliers, and we know none has signed as yet, because on September 21, DMD was awarded PACEpilot innovation awardThat category is only open to early-stage innovations not yet sold to an OEM customer. After one signs, it'll take a few years of development to reach the market.

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