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2019 Nissan Altima features VC-Turbo variable compression ratio engine, AWD, ProPILOT Assist

At the New York International Auto Show, Nissan revealed the 2019 Altima. The sixth-generation of the best-selling mid-size sedan features two new powerplants, including the advanced variable compression unit first introduced in the Infinit QX50 (earlier post); the first available Intelligent All-Wheel Drive in a Nissan sedan in the US; and advanced Nissan Intelligent Mobility features, including ProPILOT Assist. The 2019 Altima goes on sale in the US in the fall, followed by other global markets at later dates.

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Variable Compression Turbo engine. Replacing the previous-generation Altima’s 3.5-liter V6 engine is the world’s first production-ready variable compression turbo inline 4-cylinder (earlier post)—which generates the performance of some V6 gasoline engines but with 4-cylinder level fuel economy.

Designated as the VC-Turbo, the new technology continuously transforms the engine characteristics, providing both dynamic and efficient performance.

The VC-Turbo has been in development for 20 years. It seamlessly changes its compression ratio between 8:1 (for high performance) and 14:1 (for high efficiency) by means of an advanced multi-link system continuously raising or lowering the pistons’ reach to transform the compression ratio. A high compression ratio gives greater efficiency, but in certain applications poses the risk of premature combustion (knocking). A low compression ratio allows for greater power and torque, and avoids knocking.

The VC-Turbo engine offers any compression ratio between 8:1 (for high performance, left in red) and 14:1 (for high efficiency, right in blue). As a result, the engine capacity varies between 1,997 cc and 1,970 cc.


The multi-link components are manufactured in high-carbon steel alloy. Compared with the previous 3.5-liter V6 engine, the 2.0-liter VC-Turbo requires less space in the engine bay. The engine delivers 248 horsepower and 273 lb-ft (370 N·m) of torque (premium fuel).

As the angle of the multi-link arm rotates, the top-dead-center position of the pistons—and the compression ratio—changes.


The VC-Turbo engine utilizes both multi-point injection and direct injection to balance efficiency and power in all conditions. The Direct Injection Gasoline (DIG) system improves combustion efficiency and performance, and enables the engine to avoid knocking at higher compression ratios, while the multi-point injection mixes fuel and air earlier, enabling complete combustion in the chamber for greater efficiency at low engine loads. The engine also contributes to lower NVH and improved emissions (versus the previous 3.5-liter V6). The VC-Turbo engine is assembled in Japan.

Altimas equipped with the VC-Turbo (SR VC-Turbo and Platinum VC-Turbo grades) include a meter in the standard 7.0-inch Advanced Drive Assist Display so the driver can see, as well as feel, the control state of this world-first technology while driving.

In terms of fuel economy, the new 2.0-liter VC-Turbo engine is projected to have a double-digit percentage increase in highway mpg for the front-wheel drive models.

With the VC-Turbo, the driver balances the engine character through acceleration pedal operation alone. This two engines in one is another way Altima stands far apart from all other vehicles in the segment.

—José Muñoz, chief performance officer, Nissan Motor Co., Ltd.

New standard 2.5-liter 4-cylinder engine. Reflecting the Altima’s importance to the Nissan brand, the company is also making its biggest investment ever in a new model powertrain development—introducing for the first time two completely new engines for one model change.

Standard on all grade levels is the new 2.5-liter DOHC inline 4-cylinder direct injection engine, which is rated at 188 horsepower (versus the previous 2.5-liter’s 179 hp) and 180 lb-ft (244 N·m) of torque (versus the previous 177 lb-ft) and features 80% new or redesigned parts.

More than just the gains in horsepower and torque, the new engine offers improvements in noise, vibration and harshness, along with enhanced fuel economy and cleaner emissions. It also has a lower profile through adoption of a “reverse” cylinder head with integrated exhaust manifold and low engine mounting into the new platform’s engine bay for quieter operation.

Key changes to the engine’s design include a thermal-insulated resin intake port, Direct Injection Gasoline (DIG) system, variable tumble control valve, mirror bore cylinder coating, variable displacement oil pump, intake e-VTC and cooled external EGR. The new 2.5-liter engine is assembled in Decherd, Tennessee.

All 2019 Altima models, including both engine configurations, come equipped with a standard Xtronic transmission. For 2019, the Xtronic transmission receives an expanded lock-up area for improved efficiency. Paddle shifters are available with the Altima SR grade.

Altima AWD. In response to the desires of buyers in key northern U.S. market regions, Intelligent All-Wheel Drive will be offered for the first time on the Altima. The new AWD models are projected to account for a significant share of Altima US sales in these regions.

The AWD system is available in all trim levels equipped with the 2.5-liter 4-cylinder engine. The system uses an advanced torque split control strategy that automatically redistributes torque to the wheels (0:100 front up to 50:50 front-to-rear) according to road and driving conditions.

In addition, cooperative control between the AWD torque distribution, brake limited slip differential and Hill Start Assist optimizes performance on hills starts and rough roads—adding to the sense of confidence and driving pleasure under a range of driving scenarios.

Enhanced dynamic performance and chassis control. Along with the all-weather traction offered by the new all-wheel-drive system, all 2019 Altimas benefit from a range of enhanced suspension, steering and chassis control systems. Key suspension changes include the first Altima application of monotube rear shocks, added suspension reinforcements to improve vehicle response without impacting harshness, and suspension geometry adjustments to improve steering feedback.

The steering system has been upgraded to a new dual-pinion electric power steering design (DP-EPS), which enhances steering feel performance and reduces steering system noise. Steering effort is reduced at low speeds for ease of driving, and effort is increased at higher speeds for improved feedback and control.

The 2019 Altima includes a new, advanced Integrated Dynamics Module (IDM). It includes three unique systems—Intelligent Ride Control, Intelligent Trace Control and Vehicle Dynamics Control—similar to those found on the flagship Nissan Maxima sedan.

Three wheel and tire size combinations are available: 16-inch, 17-inch and, for the first time, 19-inch. The Altima SR grade, as in the previous generation Altima, features unique suspension and chassis tuning for a sportier ride and handling.

ProPILOT Assist. ProPILOT Assist eases driver workload by reducing the amount of driver acceleration, steering and braking input under certain driving conditions, such as single-lane highway driving.

ProPILOT Assist is the foundation for the autonomous vehicles of the future, helping drivers stay centered in the lane, navigate stop-and-go traffic, maintain a set vehicle speed and maintain a set distance to the vehicle ahead. To activate the system, the driver simply pushes the blue ProPILOT Assist ON button, then sets the Intelligent Cruise Control when the desired speed is reached, as with a normal advanced cruise control system.

ProPILOT Assist utilizes a forward-facing camera, forward-facing radar, sensors and an electronic control module to help the driver stay in the center of the driving lane and to maintain vehicle speed (set by the driver) or help maintain a gap to the preceding vehicle if the vehicle speed drops below the driver-set speed. It also can slow the vehicle to a complete stop and hold the vehicle during traffic jam conditions.

ProPILOT Assist is standard on the 2019 Altima SV, SL and Platinum grades.

Along with ProPILOT Assist, also new for 2019 is Rear Automatic Braking (RR-AB), which helps the driver detect stationary objects when backing up, and if necessary applies the brakes to help avoid a collision. When an object is detected while driving the vehicle in reverse at low speed, the system warns the driver with visual and audible warnings.

If the driver’s braking is not sufficient and there is still a risk of a collision, the system issues second visual and audible warnings and applies harder braking immediately before the potential collision. The new Rear Automatic Braking system is standard on Altima SV, SL and Platinum grades.

The range of safety and convenience features includes standard Automatic Emergency Braking (AEB), Intelligent Forward Collision Warning (I-FCW) and Intelligent Driver Alertness (I-DA) on all grades. Intelligent Around View Monitor (I-AVM) is standard on the Altima Platinum.

The addition of Rear Automatic Braking to Nissan Safety Shield creates Safety Shield 360, which provides front, side and rear safety monitoring and intervention technologies, under the umbrella of the Nissan Intelligent Mobility strategy. Safety Shield 360 includes Automatic Emergency Braking with Pedestrian Detection, Rear Automatic Braking, Lane Departure Warning (LDW), radar-based Blind Spot Warning (BSW), Rear Cross Traffic Alert (RCTA) and High Beam Assist (HBA).

A new Traffic Sign Recognition system provides Altima drivers with the most recent speed limit information detected by a camera unit located on the windshield in front of the inside rearview mirror. The information from detected signs is displayed in the Advanced Drive Assist Display. In vehicles equipped with navigation, the speed limit display is based on a combination of navigation system data and camera recognition.

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The all-new Altima’s design was inspired by the award-winning Nissan Vmotion 2.0 concept. The new Altima is lower, longer and wider than the previous generation with a highly balanced, aggressive stance that includes available 19-inch wheels and tires. Inside, the all-new premium interior features a wide gliding wing instrument panel, which accentuates the exterior's low cowl and hood, helping create an open, airy environment.

Comments

SJC

Forced induction is variable compression by design.

Lad

I would live this one alone; don't know why you need all this risky complicated mechanical stuff when designing in an electric motor and battery instead would work so well and is proven. This could be another Nissan failure like the CVT.

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