姚蒙候： 2025-07-28 21:19:41

Tesla Motors, always ahead of the automotive curve, is conducting a remarkable technological feat. Starting this week and continuing in the coming days, the company is using the cellular network to beam new software to update the Autopilot system on approximately 70, 000 of its cars. Tesla’s ability to communicate with its vehicles to download major enhancements and fixes, much as Apple updates iPhones, is beyond the capability of other automakers. But then, no other automaker has an system as experimental as Autopilot, or perhaps the need to make midcourse corrections to such a fundamental feature of its vehicles. The company has described the Autopilot update as intended to avoid the sort of errors that contributed to a Tesla owner’s fatal crash in May on a Florida highway. The most evident change might be visual and audible reminders that drivers should keep their hands on the steering wheel. It is an implicit of the company’s original promotion of Autopilot, introduced last October, as essentially a car system. At the time, Elon Musk, Tesla’s chief executive, said Autopilot was “probably better than a person right now. ” But the company also acknowledged then that Autopilot was also only a beta system — a technical term for an experimental version. As such, the update now underway is a tacit acknowledgment that the experiment Tesla has been conducting on the public highways is still very much a work in progress. “They’re able to take a risk and put a system out that they admit wasn’t fully baked,” said Mike Ramsey, a research director at the Gartner Group. “But they have this ability to improve it. It’s much more of a software . You get it out there and then you do software patches to fix the bugs. ” The approach, Mr. Ramsey added, comes with some risk. “You have live human beings in there,’’ he said, ‘‘so you can debate whether that’s the best way to do it. ” Tesla declined to comment for this article. The Autopilot update coincides with new policy guidelines for vehicles that the federal government issued this week. That policy, still subject to public review, gives the auto industry remarkable leeway in developing technology for fully autonomous vehicles. The main condition is that anything introduced for public use must be safe. The policy guidelines do raise concerns about semiautonomous systems that — like Autopilot — are designed to perform many of the driving duties but still require human drivers to stay alert and be ready to take control at a moment’s notice. Otherwise, the technology could be considered “an unreasonable risk to safety and subject to recall. ” Anthony Foxx, secretary of transportation, said at a news conference this week that the new guidelines were not aimed at Tesla. But the National Highway Traffic Safety Administration is still investigating the Florida accident. The question now is how just how new and improved Autopilot actually is — and whether a software download is sufficient to address what Tesla’s many critics say are the inherent shortcomings of the autonomous driving system. One of those perceived drawbacks is Autopilot’s assumption that an attentive driver can and will take over control of the car in the event of an emergency. Researchers at other companies at work on cars — including Ford Motor and Google — have concluded that this handoff can never happen quickly enough to be fully safe. A driver reviewing the updated Autopilot for The New York Times said the system required his full attention and he mentioned at least one occasion in which he would have had a collision had he not been poised to immediately hit the brakes. The new Tesla software, called Version 8. 0, also makes a significant change to the way Autopilot scans the road and recognizes objects. The previous version depended heavily on the camera to sense surroundings. In the fatal Florida collision, the camera did not see a white against a bright sky. The new version of Autopilot relies more heavily on the car’s radar to identify other vehicles and potential obstacles, and to decide when to steer to avoid a problem or apply the brakes. The elevation of radar might seem a modest difference. But it runs counter to the widely held view that radar, while highly accurate in measuring distance, is less precise in determining the shape and size of objects. “I’m not completely sure how Tesla is able to recognize and classify objects” with radar, said Jeremy Carlson, a senior automotive analyst at the forecaster IHS Markit. “I think it’s clear there are changes in the new software in the radar sensor that are doing something in a very different way. ” Other automakers argue that cameras are better at recognizing and classifying objects. “Radar is good at telling the distance to an object but not very good at recognizing what it is,” said Hideki Hada, general manager of Toyota Motor’s integrated vehicle systems group in Ann Arbor, Mich. “Cameras can tell what an object is, but it’s not so good at telling the distance. So you need both. ” Companies at work on fully cars contend that conventional cameras and radar are not sufficient to enable a vehicle to sense and respond to its surroundings. They plan to incorporate an additional technology: a type of radar called lidar. Tesla argues that its current technology is adequate for Autopilot’s purposes. But in a Sept. 11 conference call announcing the upgrade, Mr. Musk acknowledged the challenge of using radar to identify objects. The world, he said, looks “weird” in radar. Metal objects, because they strongly reflect radar waves, can appear larger than they are. Wood and plastic can appear “as transparent as glass. ” Radar sensors tend to give “false positives” — instances when they think the car should brake when it actually doesn’t need to. The new Autopilot software has algorithms to adjust for radar’s distortions, according to Mr. Musk. And if the radar sees a large, dense, metal object — like a truck — the radar sensor can slow or brake the car, even if the camera system can’t identify the object, he said. Mr. Musk predicted that the new Autopilot system was “really going to be beyond what people expect” and would make the Tesla Model S sedan and the Model X sport utility vehicle “by far” the safest cars on the road. Mr. Ramsey, the research director at Gartner, noted that Tesla was able to release Autopilot last year without having committed to a crucial engineering question — Is the radar or the camera the primary sensor? — knowing the company could modify and improve it later. “They can take a risk like that,” he said. “It’s what makes them truly distinct from other automakers. ” Whether public experiments are the best approach to highway safety is another matter. “I’m sure they are very confident the cars are safe,” Mr. Ramsey said, “but they are kind of doing trial and error. ”

温霜： 2025-07-28 21:19:42

许氏三兄弟各人听这个称呼可能有些生疏，可是说出他们的名字各人都广为熟知，许冠文、许冠杰、许冠英
。若是看过许氏笑剧的朋侪，无差池其机智讥笑的诙谐气概印象深刻
；通常熟悉上世纪70、80年月香港影戏的朋侪，...

苏米特·古拉蒂： 2025-07-28 21:19:37

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赵昱： 2025-07-28 21:19:24

專題：美聯儲大幅降息50基點，開啟寬松周期！但鮑威爾鷹派表態　　匯通財經APP訊——在美聯儲降息50個基點並体现未來幾個月將進一步寬松之後，周四（9月19日）亞市盤中，日本股市和美國股指期貨雙雙上漲

大卫德瓦厄： 2025-07-28 21:19:33

阻止报告期末，这些项目待结转面积合计26.23万平方米

Spence： 2025-07-28 21:19:42

慈善事业是中国特色社会主义事业的主要组成部分，在消除贫困、维护社会协调稳固等方面具有主要作用
。