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Volvo XC90 Coasting Transmission Deep Dive | How, when and why of coasting

In our recent 2021 Volvo XC90 Recharge review, its turbocharged-supercharged-hybridized powertrain delivered impressive horsepower and fuel economy. But Volvo has one additional trick up its sleeve, propelling a car with power that's simpler, cheaper and all-natural: It's the power of momentum and gravity. I've always been halfway to a hypermiler. I'm not obsessive about it, but in city driving, I enjoy timing stoplight approaches to keep the wheels rolling and avoid the inertia of restarting from a stop. There's little point to needlessly racing and braking between red lights, wasting kinetic energy (and therefore fuel). So I tend to drive strategically instead, often catching up with the drivers who jackrabbit but get hung up at the lights. And, back when I owned a long line of vehicles with manual transmissions, I coasted. Coasting used to be slightly controversial. Some claimed it doesn't actually save gas, though my mileage calculations showed otherwise. Another school of thought insisted that removing engine braking from the equation, even momentarily, constitutes a dangerous loss of control. Of course, an experienced driver can slip a manual transmission back into gear in a flash when engine braking's actually needed. And one should always use some common sense and judgment about when and where to coast. I'm not talking about careening down a 15% grade into a school zone.  Anyway, those arguments became moot when automatic transmissions pretty much took over. (And no, never coast with a typical automatic transmission. Even if it weren't damaging to your type of automatic — but assume that it is — the risk of screwing up a nudge of the shifter from drive into neutral is too great.) XC90 Recharge 8 View 18 Photos But happily, some automakers in recent years have added a coasting feature to their automatics, with the aim of eking out more fuel efficiency. Volvo calls the feature on its Aisin eight-speed "Eco Coast." Some Mercedes, BMWs and others call it "sailing" or "gliding." The Hyundai Ioniq, Ford Mustang Mach-E and Polestar 2 are among EVs that allow you to cancel out all regeneration and freewheel downhill. And future cars such as the BMW iX are also being designed to do it. By building coasting into the clockworks, automakers have taken any traffic safety concerns out of the question, because the car will instantly switch you back into gear when needed.

Embrace one-pedal driving in EVs and PHEVs

I just came back from a trip out to California, where I was able to drive the new 2022 Volvo XC60 Recharge in its new extended-range form (you’ll find that review on Autoblog tomorrow). One of the newly-added headline features for this plug-in hybrid SUV is true one-pedal driving. This is one-pedal driving in a PHEV, not a full battery electric vehicle, and as of now, one-pedal driving in PHEVs is exceedingly rare. Other plug-ins may offer levels of braking regeneration, but one-pedal driving is typically a feature reserved for full EVs. Adding the feature to the Volvo is a huge boost to the driving experience for me, and I sincerely hope we see it in even more PHEVs soon. In case youÂ’re new to the one-pedal driving game, hereÂ’s a quick explainer. ItÂ’s called “one-pedal” because most of the time, youÂ’re only using one pedal to accelerate and decelerate. Press in to accelerate; let off evenly and gently to decelerate via regenerative braking. The trick at the end is in slowing down the final few mph and bringing the car to a stop smoothly, which typically requires some practice and time spent figuring out how best to modulate the throttle pedal. Once youÂ’re stopped in a car with one-pedal driving, it should hold itself in place when you have your foot off the throttle, allowing you to relax your legs at lights. Applying pressure to the brake pedal would be unnecessary so long as traffic doesnÂ’t necessitate quicker deceleration than what the car is capable of via letting off on the throttle. The point, of all of the above, is that one-pedal driving in an EV or PHEV simply makes driving easier. Once you learn the car, not having to swap back and forth between the throttle and brake pedals makes stop-and-go traffic (or any kind of driving) a lot more relaxing to manage. The point of this story is to call out the lack of this feature in some EVs and nearly all PHEVs. Some of you may have already hit the comments to voice your disdain for one-pedal driving, but do note, while IÂ’m advocating for the feature to be present in all EVs, IÂ’m not advocating for it to be a required always-on feature. In fact, you should be able to turn it off and on at your whimsy. Many car manufacturers already offer one-pedal driving in their EVs, but companies like VW, Audi, Porsche and to a certain extent, Mercedes, do not. This is slightly irritating, mostly because those companies make some of the most desirable EVs on the market today.

Volvo to test 100 self-driving cars on Swedish roads [w/video]

Autonomous vehicles are increasingly being tested on public roads around the globe, including Nissan in Japan and Google here in the US, and now Volvo is preparing to test its own self-driving cars on the streets of Sweden. In conjunction with the state government, Volvo's Drive Me project kicks off next year, starting with the development of customer research and infrastructure technology before setting 100 self-driving cars loose on the streets of Gothenburg in 2017.
These 100 cars will be in the hands of customers, and the tests will help Volvo and the Swedish government track varying aspects of self-driving cars including economic benefits, consumer confidence, traffic flow and passenger safety. The technology being developed by Volvo uses not only on-board radar and sensors but also map data gathered from the cloud, and it controls all driving systems including the brakes, throttle and steering. Drivers can engage and disengage the car's autonomous drive mode by pushing a button on the steering wheel, and the technology will also allow for a self-parking feature.
While the cars shown in this demo are S60 models, the test vehicles will be based on Volvo's upcoming Scalable Product Architecture (SPA), which underpins future models like the next-gen Volvo XC90. Scroll down for a video and press release marking the announcement.