沒有中央傳動軸的AWD ---Toyota Prius AWD-e - U-CAR討論區
沒有中央傳動軸的AWD ---Toyota Prius AWD-e

Super(eric.huang.1968)

2018/12/16 05:52:53

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#6056321 IP 27.52.*.* 無任何修改 檢舉這篇文章

2019 Toyota Prius AWD-e First Drive Review | Welcome to the Snow Belt

JOHN BELTZ SNYDER 

Dec 12th 2018 at 12:35PM

 

 

 

 

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KOHLER, Wis. — Depending on where you live, the unavailability of all-wheel drive on any certain car model could be a deal-breaker. Whether they need it or not, some people refuse to go without, even if they're not concerned enough to switch to snow tires when they set their clocks back an hour in the fall. Having four driven wheels won't make you stop any quicker on ice, but the "AWD" badge on the back instantly adds 15 confidencepower. If the lack of all-wheel drive has been what's kept you from enjoying the impressive efficiency of a Prius hybridToyota has something new it'd like to show you.

Toyota unveiled the 2019 Prius AWD-e at the 2018 Los Angeles Auto Show. With 50 miles per gallon combined, it'll be the most efficient all-wheel-drive vehicle you can buy without a plug when it goes on sale in January 2019. For those who swear by high mpg but want AWD (or vice versa) this is a great thing. The Prius nameplate has been a go-to for those who want a car that's economical both up front and at the pump. Now, those four-wheels-driven stalwarts in the Snow Belt can enjoy similar frugality.

Not only that, but Toyota has listened to the masses and scaled back the visual weirdness for 2019. The updated lighting front and rear makes this car much more approachable. Inside, gone is the sea of white plastic, which simultaneously managed to look both dramatic and cheap. Instead is more palatable piano black plastic on the center console, the shifter surround and the steering wheel. There have been a couple other minute tweaks, such as placing seat heater buttons in better view near the cupholders, and adding extensions to the sun visors. Finally, the Prius adopts the grade naming of the rest of the Toyota lineup – L, LE, XLE and Limited — with the AWD-e version available in LE ($27,300) and XLE ($29,740) trims.

2019 Toyota Prius AWD-e2019 Toyota Prius AWD-e2019 Toyota Prius AWD-e

Power to the front wheels comes from the same 1.8-liter gasoline-fueled four-cylinder engine as every other Prius, along with a pair of motor/generators, to provide a combined 121 horsepower. Unlike other Prius models that use a lithium-ion battery pack, the AWD-e instead relies on a nickel-metal hydride pack. Toyota says the battery chemistry switch was made in order to provide superior cold-weather performance.

The all-wheel-drive system in this Prius has been engineered to maintain the efficiency customers demand while providing a traction benefit when needed. As such, the rear motor — which supplies just 7.1 horsepower, but a much more significant 40.6 pound-feet of torque — operates independently from the rest of the powertrain. There's no driveshaft to link the rear axle to the gas engine or front motors. It puts equal power to each rear wheel through an open differential with no mechanical torque vectoring involved, and the wheels can be braked independently as needed to compensate.

The rear motor isn't providing power all the time, either. It's always on from 0 to 6 miles per hour, helping to pull away from a stop or through a corner with maximum traction (it works in reverse as well). From 7 to 43 miles per hour, it only engages when needed. It'll also power up in situations where you could potentially lose grip, calculating yaw and speed — say, under hard cornering — to prevent understeer and help keep you on your line. Otherwise the rear motor stays quiet to conserve energy, and the magnet-less design of the motor means it doesn't add resistance when not providing power. That also means that this motor isn't used for regeneration; the front motors handle that.

2019 Toyota Prius AWD-e2019 Toyota Prius AWD-e
2019 Toyota Prius AWD-e badge2019 Toyota Prius AWD-e

Above 43 miles per hour, the rear motor doesn't activate at all. Toyota says this is not a limitation of the system, but instead a feature or choice in order to provide the efficiency and fuel economy figures Prius buyers demand. As deputy chief engineer of the Prius, Shoichi Kaneko, told us, customers on the colder, snowier Japanese island of Hokkaido were primarily concerned with traction at low speeds, where it could mean holding up a line of drivers behind you at a stop. At highways speeds, the car relies on the same tech as the FWD Prius to provide stability.

"For Prius, obviously, fuel economy is always top of mind," Kaneko-san said through a translator. "And in addition, we've had this secondary target where we want to go expand our base for our environmentally friendly vehicles. Based on that, we wanted to create a four-wheel-drive system for the Prius that didn't sacrifice fuel economy, but that would be a relatively inexpensive system that would allow us to sell Prius to new people."

For our drive, we started by taking the Prius AWD-e out on public roads in and around Kohler. It was cold out — about 25 degrees — but it hadn't had any snow recently in the area, so our roads were clear and dry. In these normal conditions, the car feels just like a normal Prius. Apart from the few cosmetic changes inside the AWD-e, we could have easily convinced ourselves we were driving the front-drive version. Only when accelerating hard from a stop did it become at all apparent that the rear wheels were being driven along with the front. You wouldn't notice the tiny bit of bite and shove if you weren't specifically looking for it. It's a lack of hesitation that is only apparent in comparison to the standard Prius.

Otherwise, in these conditions, it's the usual Prius experience: an efficient, affordable way to comfortably get from point A to point B. It's not a quick car by any stretch of the imagination, and that's clearly not the point. Prius customers aren't looking for speed. They're looking for efficiency, and the AWD-e still has it. It offers 52 mpg city, 48 highway, and 50 combined. Compared to the FWD version, it suffers a hit of just 2 mpg across the board.

2019 Toyota Prius AWD-e interior2019 Toyota Prius AWD-e2019 Toyota Prius AWD-e shifter

The Prius AWD-e still has Normal, Eco and Power modes to cater the accelerator response to your needs or whims. It also retains the same shifter layout, with a "B" setting that allows for a stronger regenerative braking feel, allowing you to get on the brake pedal later and less often. While we thought we'd appreciate the more direct acceleration feel of Sport mode, more power means more sound from the gas engine up front. After using Sport for a bit, we dubbed it "Groan" mode, and switched out of it. Eco mode, while providing greater efficiency, also makes it easier to drive the Prius quietly, which makes the entire car — and any electrified vehicle, really — feel more refined.

With Mother Nature — and the area's flat geography — failing to cooperate for our test, we took the Prius to a closed circuit where we could simulate the sorts of situations where all-wheel drive could prove more useful. With the help of some snow-making machines and a front end loader, we had a small circuit that turned from asphalt to dirt to gravel to snow, including a hill of snow near the start. We had both FWD and AWD Priuses on hand for testing, each wearing its stock set of all-season, low-rolling-resistance tires on 15-inch wheels.

While we weren't allowed to take the FWD Prius over the hill, we had the chance to take it around the rest of the track a number of times. With a little bit of effort, we could get the Prius to understeer a smidge on the loose surfaces. With enough gusto, we could overcome the nannies and get it to plow more aggressively while cornering through the snow, though it resisted the urge better than we had expected.

2019 Toyota Prius AWD-e2019 Toyota Prius AWD-e

In the AWD-e, we headed for the snow hill first. We stopped completely on the icy incline. After a moment, we put our foot into the throttle. The Prius paused a half beat, then slowly pulled up and away. It built speed slowly with smoothness and linearity as it climbed, and kept its nose pointed straight as it crested the small but steep hill. We repeated this exercise multiple times that day, and each time was the same: steady, smooth and undramatic.

We flogged the poor little Prius harder with every lap of the course. Each uneventful pass through the snow slalom had us taking it a little faster through the slippery curves. On many of the laps, a brave man waited on the outside of a curve with a snowblower to replace the white stuff we displaced as we passed. We could hear the quiet, muffled clicking as the stability control worked its magic, but weren't able to push the Prius AWD-e into understeer — the higher cornering speeds it allowed over the standard model meant crossing that threshold could've potentially meant a bad day for snowblower guy. Or perhaps not at all, depending on how well the car could recover. We weren't willing to find out; we'll save that test for an empty parking lot.

2019 Toyota Prius AWD-e

And that's was when the Prius AWD-e really began to make more sense to us, despite our affinity for snow tires. With all-wheel drive, the car mostly felt the same as any other Prius. It wasn't adding any huge, tangible change in driving behavior. What it does is subtle and demonstrates itself as a lack of the negatives you'd otherwise notice: slip, instability, hesitation, understeer. That adds up to confidence. And it's confidence you can appreciate without having to sacrifice much in fuel economy.

The majority of drivers never make the switch to snow tires in the winter, whether because of its added cost, a matter of storage space or an issue of fuel economy. Many of them would rather just have all-wheel drive. For them, there's now a Prius option.

已臻完美,何需苛求!

3

則留言

1

氣噗噗(airstage)

2018/12/17 01:08:06

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#6056355 IP 240.104.*.* 無任何修改 檢舉這篇文章

會有越來越多油電混合車用這種設定,前輪引擎後輪電動馬達,純電行駛就是後驅了...但這跟真正意義上的AWD還是有不同吧?

你有freestyle嗎(jazzcat)

2018/12/17 01:08:57

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#6056356 IP 251.194.*.* 無任何修改 檢舉這篇文章

何苦用滿滿的英文為難網友

Super(eric.huang.1968)

2018/12/17 05:53:20

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#6056364 IP 27.52.*.* 無任何修改 檢舉這篇文章

回應 jazzcat(你有freestyle嗎)所寫

 

何苦用滿滿的英文為難網友

 

大大可以用Chrome瀏覽器,右上角有一個"翻譯"...

已臻完美,何需苛求!
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