Comma One is not up to the safety standard "Magic Kid" product is called to stop

At the TechCrunch Disrupt conference in September this year, George Hotz, the founder of the self-driving startup Comma.ai, known as the "magic kid", showed the Comma One.

Although Hotz did not mention the detailed specifications of the device at the conference, according to the public news, it does not need a lot of sensors, only relying on the built-in front radar and a camera, Comma One collects from the camera. data. Its function is similar to Tesla's Autopilot autopilot system, so users don't have to change a new car at all, just install the device on an adaptable model.

In addition to the $999 price, users pay a subscription fee of $24 a month to use their services. At the time, some media said that Comma.ai was an industry spoiler because the price of $999 was much lower than the price of many autonomous driving solutions on the market.

Dramatically, the “industry spoiler” product was stopped by the US Highway Traffic Safety Administration after a public appearance for a month. On October 28th, Comma.ai announced on Twitter that it would stop selling the Comma One semi-automatic driving equipment.

The reason is that the company recently received a 10-page notice from the US Highway Traffic Safety Administration (NHTSA) that the device was not sold under US law and required Comma.ai to provide detailed safety information. In the notification, __NHTSA mentioned the security concerns of Comma One. "We are concerned that this product will threaten the safety of users and other road users."__

NHTSA did not explicitly ask Hotz to shut down the Comma One project, but “recommended to delay the sale of Comma One, or postpone Comma One on the road until Comma.ai can ensure the safety of the product.” The implication is that unless Comma.ai can Take enough training data to convince NHTSA that the Comma One device is safe.

However, Hotz said on Twitter that he will give up the product and Comma.ai will explore the potential of other products and markets.

Comma.ai was founded at the end of 2015. By remodeling a Acura ILX model, Hotz implemented the autopilot function on the highway in the San Francisco Bay Area with his own software and hardware autopilot system. In April of this year, Comma.ai received $3.1 million in financing from A16Z.

This summer, some media installed an early version of Comma One on their vehicle and tested it. Some problems were found: Comma One was able to perform well on the highway, but it was in trouble when entering the entrance ramp and exit ramp. The performance of this system in the urban environment is less reassuring. Neither the Hotz nor the Comma.ai team commented on this.

In the world of technology, breaking the rules in an unconventional way is worth celebrating. But when it comes to the issue of car safety, even the "magic boy" can't do whatever he wants.

In September this year, the US government announced a new regulation for self-driving cars. The Federal Automated Driving Vehicle Policy Guide, jointly launched by NHTSA, sets requirements in various aspects such as safety requirements and regulatory measures, and has pointed out the direction for the development of American self-driving cars.

A case like NHTSA calling the Comma.ai device may be just the beginning. As more and more automakers, Internet companies and related technology companies claim that they are bringing autonomous vehicles to market, the role of regulators in autopilot technology cannot be ignored.

PWM Solar Controller

The main function of the PWM Solar Controller is to manage the charging and discharging process between solar panels and batteries in solar power generation systems. It is a traditional charge controller that controls the charging voltage and current through pulse width modulation technology to maintain the charging state of the battery and protect the battery.

Main effect:

Charging control: PWM Solar Controller controls the charging voltage and current through pulse width modulation technology to ensure that the battery is charged at an appropriate voltage and current to prolong the service life of the battery.

Overcharge protection: The PWM Solar Controller can monitor the charging status of the battery, and when the battery is fully charged, it will automatically stop charging to avoid battery damage caused by overcharging.

Over-discharge protection: PWM Solar Controller can monitor the discharge state of the battery. When the battery power is lower than a certain level, it will automatically stop discharging to avoid battery damage caused by over-discharge.

Differences from other charge controllers:

Modulation technology: PWM Solar Controller uses pulse width modulation technology to control the charging and discharging voltage and current to maintain the charging state of the battery. In contrast, MPPT Solar Controller uses maximum power point tracking technology to adjust the output voltage and current of solar panels in real-time to achieve maximum power output.

Energy conversion efficiency: Compared with the MPPT Solar Controller, the energy conversion efficiency of the PWM Solar Controller is lower. Because the pulse width modulation technology cannot adjust the operating point of the Solar Panel in real-time, the output power of the solar panel may not be maximized.

Application Scenario: PWM Solar Controller is a traditional charge controller suitable for small-scale, low-power solar power generation systems. The MPPT Solar Controller is suitable for larger-scale, high-power solar power generation systems to improve energy utilization efficiency.

Overall, the main role of the PWM Solar Controller is to manage the charging and discharging process in the solar power generation system and protect the battery from damage. Compared with MPPT Solar Controller, it uses traditional pulse width modulation technology, and the energy conversion efficiency is lower. Suitable for small-scale, low-power solar power generation systems. The MPPT Solar Controller uses maximum power point tracking technology, which can improve the energy utilization efficiency of solar panels, and is suitable for larger-scale, high-power solar power generation systems.

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