Audi introduces Q7 e-tron quattro diesel PHEV SUV at Geneva; 138 mpg US
02 March 2015
Audi introduced the Q7 e-tron quattro plug-in hybrid (earlier post) at the Geneva show. The Q7 e‑tron quattro is Audi’s second vehicle featuring a plug‑in hybrid drive system, and the first diesel plug-in hybrid with quattro drive in its segment.
Powered by the 17.3 kWh, liquid-cooled lithium-ion battery pack, the large SUV covers up to 56 kilometers (34.8 mi) on electric power alone. Together with the diesel engine, the car can cover a total distance of 1,410 kilometers (876.1 miles). According to the ECE standard for plug‑in hybrid vehicles, the Audi Q7 e‑tron quattro needs only 1.7 liters of diesel fuel per 100 kilometers (138.4 US mpg) and has a CO2 emission level of less than 50 grams per kilometer (80.5 g/mi).
|Audi Q7 e-tron 3.0 TDI quattro. Click to enlarge.|
The 6-cylinder 3.0 TDI and electric motor deliver 275 kW (373 hp) and 700 N·m (516 lb-ft) of system torque—enough to accelerate from 0 to 100 km/h (62.1 mph) in 6.0 seconds and for a top speed of 225 km/h (139.8 mph).
Like all Audi hybrid models, the Q7 e-tron quattro has also been designed as a parallel hybrid. The 3.0 TDI, a highly efficient latest-generation V6 diesel engine, delivers 190 kW (258 hp) of power and 600 N·m (442.5 lb-ft) of torque. Active engine mounts—a world first for a diesel engine—eliminate unwanted vibrations through selective counter pulses.
The disk-shaped electric motor provides 94 kW and 350 N·m (258 lb-ft) of torque. Together with a decoupler, it is integrated into the eight-speed tiptronic. The automatic transmission is notable for its high efficiency and low weight. The quattro permanent all-wheel drive, also compact and lightweight, transmits power to all four wheels. During fast cornering, its center differential works closely with the wheel-selective torque control system, an intelligent software feature.
Another efficiency component is the standard thermal management system with integrated heat pump, specially developed for the Q7 e-tron quattro. This makes it possible for the waste heat from the electrical drive components to be made available to the interior of the Q7 e-tron quattro. Audi is the first manufacturer worldwide to introduce this technology in series production in a plug-in hybrid.
The lithium-ion battery pack comprises 168 cells. The new two-phase charging technology installed in the new Q7 e-tron quattro allows charging with up to 7.2 kW of power. Depending on the infrastructure (appropriate high-performance industrial socket) and the charging cable, full charging of the battery takes about two-and-a-half hours. A power charging cable is standard equipment.
Audi offers its customers an optional package of e-tron services. They range from changeover to renewably generated electricity (Audi Energy) to installation and customer service. A convenient solution is also provided by the standard e-tron services in the Audi connect portfolio, for controlling functions such as charging and air conditioning via smartphone.
The new electromechanical power steering is highly efficient as well as sensitive. The five-link wheel suspensions, also newly developed, on the front and rear axles are lighter by 60 kilograms (132.3 lb) compared with the predecessor model, and greatly contributes to the high driving dynamics. The lowered center of gravity also plays an essential role here.
Even the basic version of the large SUV rolls along gently and smoothly, while comfort is further enhanced by the optional adaptive air suspension with controlled damping. The driver can regulate the mode of operation via the standard Audi drive select dynamic handling system. It offers up to seven modes and integrates further technical components such as the steering, accelerator and automatic transmission.
A tilt angle display, hill descent control, an off-road mode for the Electronic Stabilization Control (ESC) and off-road navigation are standard.
Drive modes. The hybrid management system controls the operating states of the Audi Q7 e-tron quattro. The driver can choose between four modes. The EV mode prioritizes electric driving, while in hybrid mode hybrid management decides on the type of drive for the most part freely. In battery hold mode, the system stores the available electrical energy, and charges the battery in battery charge mode.
The large SUV generally starts in electric mode. To activate the TDI, the driver has to press down on the active accelerator pedal (another innovation from Audi) beyond a certain point of resistance, which depends on the requirements of the hybrid management system. A pressure point must also be overcome for boosting, in which case both the engine and motor work together.
When the hybrid mode is active and the eight-speed tiptronic with integrated electric motor is in shift position D, the Audi Q7 e-tron quattro changes to coasting mode once the driver takes his foot off the accelerator. The TDI and electric motor are then deactivated. Should the Audi Q7 e-tron quattro approach a slower vehicle ahead or a traffic circle or the city limit, the coasting mode ends in favor of controlled regenerative deceleration. To detect the traffic situation ahead, the data from MMI navigation plus, the front camera and (if adaptive cruise control is on board) the radar sensors are used.
When driving in shift position S and in the battery charge mode, energy recovery begins as soon as the driver releases the accelerator. The driver can progressively influence the degree of recuperation by operating the shift paddles on the steering wheel. The majority of all brake applications in everyday use also occur via the electric motor. In the event of moderate or sharper deceleration, the hydraulic brakes come into play.
The standard MMI navigation plus is closely integrated in the hybrid management system in the Audi Q7 e-tron quattro. Based on the navigation data and real-time traffic information, the most fuel-efficient choice of four modes can be calculated along the route to the destination as soon as the car is started, even for long distances. The predictive efficiency assistant facilitates a forward-looking hybrid strategy, and is another new and breakthrough technology from Audi.
During driving, the predictive efficiency assistant supplies highly precise information on the near surroundings – creating a detailed picture of up to three kilometers (1.9 mi) ahead along the route from the navigation and camera data as well as from the radar information. On approaching traffic signs with speed limits, town signs, bends, traffic circles and intersections, the system visually signals to the driver to release the accelerator pedal. At the same time, the active accelerator pulses once against the sole of his or her foot.
Operation and displays. The Q7 e-tron features the standard Audi virtual cockpit—the fully digital instrument cluster with its 12.3-inch diagonal presents all the important information in graphics of brilliant quality. The driver can retrieve different levels of information, including specific e-tron displays such as the power meter. The large display makes it possible to switch to a conventional tachometer or to display it simultaneously with the power meter. In addition, the instrument cluster depicts the displays for the energy flow, the range (with numbers and graphs) and the charge level of the battery.
Audi also uses the latest technology from consumer electronics in the area of infotainment. Its main element is the second-generation modular infotainment platform, which utilizes the enormous computing power of the Tegra 30 graphics chip from NVIDIA. Operation is by voice, with the multifunction steering wheel or with the completely newly developed MMI terminal, the MMI touchpad. On request, Audi will integrate the MMI all-in-touch, the touchpad with haptic feedback.
Audi has added specific items to infotainment for displays in electric mode. Consumption statistics are available, for example, along with a graphic display of the electric range in the navigation map. Charging as well as the preliminary air conditioning can also be time-controlled and adapted to the customer’s requirements, such as departure time, so as to save resources and costs.
The standard Audi connect component links the Q7 e-tron quattro to the internet using the fast LTE standard. Passengers can surf and email with their mobile devices via the Wi-Fi hotspot, while the driver can make use of numerous new online services and apps in the car. The Q7 e-tron also features the Audi tablet, which serves as Rear Seat Entertainment, a 3D sound systems from Bose and Bang & Olufsen and the new Audi phone box that inductively charges cell phones.
Assistance systems. New are collision avoidance assist, turn assist, cross-traffic assist and trailer assist. The adaptive cruise control including traffic jam assist takes over the steering from the driver on well-paved roads at speeds of up to 65 km/h (40.4 mph) if the traffic is slow-moving. In combination with the predictive efficiency assistant, speed is automatically adjusted when entering built-up areas and to observe speed limits as well as on bends and at intersections, once again using the coasting mode.
The Audi Q7 e-tron quattro will arrive at dealers in Germany in the spring of 2016.
If mass produced, this may become the leader in improved performance, low consumption PHEVs.
Posted by: HarveyD | 02 March 2015 at 02:08 PM
It would have been cool if they had had the guts to use their 240 hp, 2.0 litre 4-cyl diesel from the new Passat. They could probably even have done it without sacrificing torque, since the 4-cyl already has 500 Nm, and the e-motor has 350 Nm (not at the same rpm, though).
I assume the maximum torque has been withheld at 700 Nm to reduce cost/wear for the gear box, torque converter etc.
Ahh, well. The Q7 is rediculously large and heavy so what difference does 100 kg extra engine weight make, right? Plus, in the very important American market, few Q7 customers are likely to trust a 2.0 diesel in such a premium car.
Posted by: Thomas Pedersen | 02 March 2015 at 02:44 PM
Agree that the 2.0 diesel would be enough oomph. Only know of it being used in transverse orientations currently though.
Posted by: DavidJ | 02 March 2015 at 04:27 PM
The reason they probably used the 3.0L is probably several fold, but my guess would be that it is a showcase of brand new technologies(could be a tad more efficient in this chassis than the 2.0L)
Also if you look to the competitors; Ford's Explorer got ripped apart by the critics for the Ecoboost I4 in the explorer...which was 240 HP, and 270ft-lbs of torque vs VW's 150 HP and 236ft-lbs. For the price this thing will go for they probably want it being a top performer in its segment. This probably also weighs as much or more than the explorer.
I hope this hybrid is not the exception but rather the trend in the upcoming years...
I would have wagered that the gear spread on this is massively long... since it is a parallel setup. I saw the 138 and immediately thought it was going to be a generator type. If this was a series hybrid, the 2.0L would have been fine, heck even the 1.8L would have been fine, but since there is a direct link to the wheels from the engine, it must bear the brunt of the load as the battery cannot charge without the vehicle either revving up in a neutral state or engaged in a forward gear moving forward.
Its just that the engine has to be able to move the car independently of the electric motors in this setup.
Posted by: CheeseEater88 | 03 March 2015 at 03:37 AM
I agree with all that you said. Except the 2.0 double turbo diesel from VW in the Passat has 240 hp and 500 Nm, as I wrote in my post.
You're right, if the driver is towing a boat uphill and simultaneously presses the 'maintain charge state' button, it could lead to a 'non-premium' driving experience ;-)
Posted by: Thomas Pedersen | 03 March 2015 at 04:56 AM
I couldn't navigate the VW site to find that engine, I believe it exist my apologies on not finding it.
I used a published review of the Passat to gather the torque numbers.
Posted by: CheeseEater88 | 03 March 2015 at 07:03 AM
I personally am not a fan of diesels in light duty vehicles... but this is a very good example of what can be done with the technology we have now, we just need more companies to jump on board with large plug-ins.
If a ~3-6x jump in mileage is not enough incentive, I'm a bit worried.
For Americans I don't know if this will be to popular, if it were gasoline I believe it would sell much better, and probably cheaper(or just have more electric range). T he new emission equipment and fuel tolerances are very scary to me.
A parallel series, running at a set load, at a optimum RPM, can reach a higher plateau of efficiency... independent of vehicle speed, or operation... though, it may be weird for customers to hear the engine to come on at optimum times like hill climbs or even just after on the down hill... good insulation and NVH handling would make customers feel more comfortable with an engine that operates without much input from them... (like if you stand on the gas pedal, the engine still may not run until the battery is sufficiently depleted.)
Posted by: CheeseEater88 | 03 March 2015 at 08:22 AM
The BiTurbo 2.0 CR-TDI is only available outside North America (IE:Europe). There is a version of the old 2.0 CR-TDI installed in the Amarok (about the size of Chevy Avalanche/Honda Ridgeline). I believe the BiTurbo installed in the Euro Passat is based on the new 2.0 CR-TDI. The only similarity between the two engines is bore spacing.
The Q7/Touareg/Cayenne triplets have slimmed down in the last few years, but they are all 5k lbs SUVs with 7,800lbs tow ratings. While a 2.0 TDI might be able to move these monsters, it will not return the driving experience owners expect. Besides even the 3.0 TDI without hybrid is returning 30MPG+ with demanding US drivers.
The two vehicles with BiTurbo 2.0 CR-TDI;
The Aramok (as available in Australia)
The BiTurbo Passat (VWVortex article)
Posted by: Jason Burr | 03 March 2015 at 11:06 AM
The new standards for on-road and off-road diesels are going to be an interesting change for America... for the first time a diesel may be cleaner in operation than a gasoline car. (and they've tested tier 4 fumes on rats already)
Having said that I wanted to expand on why I was scared of the new set-ups. After treatment cost as much as the engines in most cases, bad fuel, poor maintenance, and end user's lack of education on proper care(or their unwillingness to do so) will be a blight on the on these tier 4 diesels.
I think they are a good thing... but in the public I think they are going to have a hard time outside of fleets. It doesn't take much to cause 1000s of dollars worth of damage, wrong oil, running out of fuel, contaminates in the fuel...
I hope the link provides some good info for those not so deep in the car world.
Posted by: CheeseEater88 | 03 March 2015 at 09:34 PM
I agree with what you said. I was talking from a European perspective, and no one on this side of the pond is towing a dual engine speed boat to Lake Tahoe. In Europe you will find a car such as this being mostly used to cruise at 100-140 mph on the German Autobahn, before slowing down to 80 mph in the neighboring countries. And those tasks could be accomplished with the (Europe exclusive, I guess) 240 hp 2.0. But again, in such a heavy car, 3.0 V6 is not overkill. The former Q7 with 6.0 V12 TDI - that was overkill! Imagine replacing injection nozzles on that... Yikes!
Besides, this PHEV get ~100 of its 138 mpg from the battery. It hardly matters for the official figures what the ICE fuel economy is. A more economical ICE might bump it up to 142 mpg - who cares?!?
Actually, I notice for BMW that the 325D with 2.0 double turbo gets the same fuel economy as the 3.0 straight six in the 330D even though the six cyl has more torque, power, and weight. Maybe there is a down-speeding factor that comes into play here?
Posted by: Thomas Pedersen | 04 March 2015 at 02:13 PM