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XIII. Summary and Conclusion
The EDR log data from a Tesla sudden acceleration incident has been analyzed. To explain the EDR data, the operation of Tesla’s drive motor control system and braking system were examined. As expected, friction braking and regen operation are completely separate with no blending, with the possible exception of Tesla models having a single rear drive motor. The braking system, however, also includes several vehicle stability control functions that can have a profound effect on regen operation in the presence of wheel slip, such as stopping regen when going over bumps and while turning corners. One of these slip control functions called Electronic Drag Control (EDC/MSR) can even cause the drive motor to speed up if regen is causing slip in the rear drive wheels that can lead to an oversteer or understeer. This same slip control function can be misled by a defective brake light switch to confuse a brake-induced deceleration for a regen-induced deceleration, in which case as the driver presses harder on the brake pedal, a larger positive motor torque is produced. This is believed to be the cause of sudden acceleration in the incident under consideration. To see if this same mechanism could explain other Tesla sudden acceleration incidents, NHTSA contact reports were examined. It was found that over 70% of all Tesla sudden acceleration incidents could be explained by this cause. Similarities between the braking systems for Tesla and non-Tesla vehicles imply further that this same cause can explain many sudden acceleration incidents in non-Tesla electric vehicles having rear-wheel drive (RWD) or all-wheel drive (AWD). Finally, it is concluded that vehicles having internal combustion engines along with rear wheel drive are susceptible to sudden acceleration from this cause if the brake lights are defective. Comments for testing vehicles for this mechanism are provided.
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: 读完了给个摘要吧。
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FROM 36.154.175.*