The NSX Sport Hybrid Super Handling All-Wheel Drive (Sport Hybrid SH-AWD) appetite section electrifies all phases of driving, possibly accelerating, braking or cornering. Sport Hybrid SH‑AWD is a serve expansion of Acura’s rarely regarded Super Handling All-Wheel Drive (SH-AWD). It is a first-of-its-kind record in a outlandish sports automobile segment. Instantaneous acceleration G force is gifted from a impulse a motorist touches a throttle, by a evident torque response of 3 electric motors operative in unison with a bespoke, twin‑turbocharged V6 and 9-speed twin purchase smoothness (9DCT).
The NSX motorist will knowledge rise opening from a Sport Hybrid SH-AWD appetite unit’s matrimony of automatic and electrical components, operative as a element to yield present and linear acceleration, unchanging and absolute braking and accurate and predicted handling. Like a first‑generation NSX, this driver-centered supercar creates a many of any driver’s capabilities while minimizing motorist effort and probably expelling a compulsory tradeoffs between extent opening and bland pushing pleasure.
- The twin-turbocharged V6 engine creates absolute thrust, while a electric Direct Drive Motor and TMU respond immediately to a driver’s stifle demands.
- Rear spindle torque flows by a new 9DCT; 1st rigging is for extent launch acceleration, a close-ratio gears (2nd–8th), creation a many of a NSX appetite band, while 9th rigging is optimized for free highway cruising.
- The front-mounted Twin Motor Unit (TMU) provides through-the-road “active all-wheel drive” with eccentric electric motors producing on-demand expostulate force during a front wheels. The TMU “direct bend control” ability enhances agility, fortitude and cornering precision—the NSX motorist can govern super-precise line tracing during cornering.
- The TMU provides regenerative braking force, ancillary braking final and approach bend control with disastrous torque while recharging a hybrid battery.
- The TMU also provides electric car operation in Quiet mode during speeds reduction than 50 mph for brief distances.
Every time a motorist creates a appetite demand, a TMU and a Direct Drive Motor immediately enlarge appetite prolongation from a twin-turbocharged V6 engine, regulating a evident torque that is an fundamental evil of electric motors. Total element rise outlay is 573 horsepower—500 horsepower from a gasoline engine and 73 horsepower from a TMU and Direct Drive Motor.
System expostulate force opposite time during far-reaching open throttle
Twin-Turbocharged V6 Engine
At a heart of a NSX Sport Hybrid SH‑AWD appetite section is a bespoke, twin-turbocharged, V6 engine that achieves high appetite and extended torque output.
NSX twin-turbocharged V6 engine
With a focus ratio of 10.0:1, a NSX engine has a specific appetite outlay of some-more than 140 hp per liter of engine displacement, due to a series of modernized engine technologies.
Acura Firsts for a NSX Engine
- Twin-turbo initiation system
- Swing arm-type compress valvetrain system
- Three-piece H2O coupler (engine retard and heads), including H2O jackets between a cylinder bores
- Plasma-transferred thermal spray‑coated cylinder walls
- Use of both approach and pier fuel injection systems
- Two-stage sequence expostulate element for a valvetrain
- Viscous check mounted to a crankshaft
- Dry sump lubrication
The bespoke, twin-turbo element for a all-new engine offers a clever change of high appetite with extended torque, high fuel potency and fundamental wrapping advantages. Through clever investigate and development, a NSX engine pattern and engineering group energetic that a ideal boost vigour is 105 kPa (1.05 bar or 15.23 psi).
Increasing a engine intake atmosphere vigour also increases a intake atmosphere temperature. A high‑volumetric upsurge air-to-air intercooler dramatically reduces intake atmosphere temperature, while augmenting a firmness of a atmosphere intake assign for extent power.
Each turbocharger uses an electronic wastegate for discerning response and accurate control. The single-scroll turbocharger pattern uses smaller turbos to revoke weight and urge packaging, while still assembly appetite and opening benchmarks.
In an engineering and pattern practice drawn true from Acura’s endless racing experience, a cylinder heads propitious to a twin-turbocharged V6 are rarely compress during a 75-degree angle. They embody a compress valvetrain that uses pitch arm-type valve actuators. The some-more compress conduct structure reduces a inertial weight of a valvetrain by 22 percent compared to a rocker arm-type design. This compress pattern together with a dry sump lubrication was focused on obscure a vehicle’s core of gravity.
The cylinder heads implement a three-piece H2O coupler for softened cooling potency and coolant upsurge control. The race-inspired cylinder conduct pattern also optimizes a swirling of intake atmosphere so that it mixes with fuel in a some-more ideal demeanour for softened combustion, improving potency and emissions performance.
Plasma-Transferred Thermal Spray-Coated Cylinder Walls
Most aluminum engines need a expel iron cylinder ship to yield sufficient wear resistance. Instead, engineers on a appetite section growth group practical a plasma‑transferred thermal obscurity to a cylinder walls. This recently‑developed technique offers 52 percent softened feverishness send (thermal conductivity) and a scarcely 7lb.-decrease in altogether engine weight contra expel iron cylinder liners. Additional advantages of a plasma-transferred thermal spray‑coated cylinder walls embody increasing horsepower, torque and stifle response.
The plasma-transferred thermal obscurity routine melts an atomized iron powder that can be sprayed onto a cylinder walls. A supersonic plasma jet is used to obscurity a fiery material, stacking a little particles on tip of any other to form a really skinny and intensely wear-resistant coating. Eliminating cylinder liners allows additional H2O channels to be placed between a cylinder bores for softened cooling efficiency.
Intake and Exhaust Variable Valve Timing Control
The NSX engine incorporates intake and empty valve timing control (VTC) technology, that balances high torque and extent appetite outlay with reduced empty emissions and aloft fuel efficiency.
- At engine idle, VTC stabilizes explosion for well-spoken waiting by minimizing intake and empty valve overlap, dwindling a volume of empty gas recirculation.
- During steady-state journey or underneath light acceleration, a VTC element reduces empty emissions and engine pumping waste by optimizing valve overlap.
- Under far-reaching open stifle during low engine speeds, a overlie of a intake and empty cam timing is stretched so that a turbochargers can work during extent potency for optimal appetite smoothness and responsiveness.
- When doing a engine during towering rpms, overlie of a empty and intake timing is gradually reduced for softened volumetric potency to emanate extent power.
Direct and Port Fuel Injection
The NSX engine combines both approach and pier fuel injection systems to yield well-developed appetite prolongation and emissions performance.
Direct injection is a primary means of fuel smoothness within any cylinder, while pier injection is used for additional appetite outlay in high-performance pushing situations. The approach injection element electric fuel injectors are mounted in a cylinder conduct and obscurity a fine, rarely atomized obscurity of fuel directly into any cylinder underneath really high pressure. This is finished so that a fuel ignites roughly instantly and completely, maximizing engine opening and fuel potency with reduced emissions. Under high‑performance demands, a pier injection element supplements a approach injection system, feeding fuel into a intake ports where it mixes with a incoming atmosphere for increasing appetite production.
In summary, by optimizing a approach and pier injection element with a operation of a engine’s twin turbochargers, a NSX Sport Hybrid SH-AWD appetite section engineering and growth group were means to:
- Optimize approach injection and high decrease airflow explosion routine within any cylinder for superb emissions performance
- Improve explosion potency and appetite output, assisted by a high decrease intake pier design
- Precisely supply a compulsory volume of fuel for extent appetite outlay
- Reduce a prolongation of hydrocarbons and particulate by avoiding fuel wetting on a piston and cylinder sleeve
Dry Sump Lubrication
In another focus of race-bred technology, a all-new NSX is a initial prolongation Acura car to use a dry sump engine lubrication system. This element lowers a engine core of sobriety by 2.4 in. (61 mm) while assisting safeguard unchanging engine lubrication underneath impassioned cornering bucket conditions. The dry sump lubrication element replaces a compulsory oil vessel with a apart oil fountainhead and a dedicated chain-driven oil siphon mounted directly to a reduce engine block. Six apart scavenger siphon impellers collect a oil, and twin siphon rotors feed it behind into a oil tank.
A two-into-one intake plural pattern minimizes torque flaw between any bank of cylinders. Twin stifle bodies concede some-more atmosphere into a element and finer stifle control, while shortening a tapping of a air.
Compact and lightweight, a immaculate steel empty element propitious to a NSX includes twin catalytic converters per cylinder bank and 4 outlets, enhancing empty gas upsurge and shortening emissions. Silicon empty element mounts conflict feverishness and offer a vigourous means of securing a empty element to a vehicle.
Engine Sound Management
Intake Sound Control
To raise a driver’s abdominal knowledge inside a NSX cabin, a Integrated Dynamics System can be used to rivet a new intake sound control and active empty valve systems to fine-tune cabin sound peculiarity and volume to compare a comparison energetic mode. The sound vigour turn operation within a cabin between far-reaching open stifle in Track mode and electric car cruising in Quiet mode is 25 (dB)—a far-reaching operation of heard sensation.
Intake sound control utilizes a pipe, connected directly to a engine’s intake manifold, with an electrically-operated moth valve that can be non-stop and shut, depending on a Integrated Dynamics System setting. A diaphragm translates high-pressure atmosphere from a plural to reduce vigour sound waves. On a other side of a diaphragm, a singular siren afterwards splits into twin pipes that broadcast sound to twin outlets in a back uppermost portions of a cabin.
Active Exhaust Valve
The NSX active empty valve element is a nominal member of a Integrated Dynamics system, charity still and polished pushing or pulse-quickening sound during a will of a driver. Two electrically-operated valves are possibly open or sealed formed on motorist stifle inputs and a comparison mode of a Integrated Dynamics System setting.
- In Quiet mode, a empty valves are closed, and a empty gases are routed by silencers and out a twin outboard empty pipes for a some-more resigned empty sound, permitting a motorist to knowledge a intake soundtrack some-more clearly. Power and torque from a Sport Hybrid SH-AWD appetite section is some-more than sufficient to facilely accommodate motorist demands.
- In Sport mode, a empty valves are primarily closed. They will open depending on how aggressively a motorist accelerates.
- In Sport+ and Track modes, a empty valves are open, enabling extent empty gas quickness out of all 4 empty pipes. This produces extent engine opening and a full‑throated empty note.
The active empty valve system—together with a cabin sound modulation technologies of Active Sound Control and Intake Sound Control—serves to emanate a customizable heard knowledge both in and outward of a NSX. From a inside overpower of Quiet mode to a full concerto of Track mode, a cabin fills with sounds any pushing fan loves to hear: a high‑performance “pop” from a empty when executing an upshift, a discerning blip of a stifle on downshifting and a occasional particular off-throttle gurgle that is a acquire sign of a appetite and torque capability of a twin-turbocharged V6 engine.
Engine Balancing and Break-In
The NSX Sport Hybrid SH-AWD appetite section growth group serve softened engine opening and excellence by shortening noise, quivering and rudeness (NVH). The latest in engine balancing record and a series of new processes were practical to grasp optimal balance, such as:
- Next-generation engine evidence apparatus to some-more accurately magnitude engine imbalance
- Variable missile weights practical to a 8 ascent holes on a flywheel
- Nine ascent holes combined to a crankshaft gelatinous check that can be used for glorious tuning
Before being propitious into a NSX, a engine undergoes an vicious additional peculiarity step called a “hot fire” break-in program. The engine is placed underneath bucket on a specially-designed engine dynamometer that simulates a homogeneous of 150 miles of driving.
Direct Drive Motor
The Direct Drive Motor, finished between a twin-turbocharged V6 engine and a 9DCT, provides additional torque and appetite support to a back wheels.
NSX Direct Drive Motor
To assistance discharge a response check typically compared with turbocharged engines, a Direct Drive Motor acts directly on a engine’s crankshaft which, together with a front-mounted TMU, helps a NSX comprehend immediate, high-output and high-torque acceleration. The efficacy of this pattern is quite conspicuous when accelerating from a delay during low engine speeds.
The NSX utilizes a Direct Drive Motor to start a engine instead of regulating a compulsory 12-volt engine starter motor. Eliminating a 12-volt starter ring rigging reduced weight and blueprint complexity.
To assistance urge fuel efficiency, a NSX comes versed with idle stop capability. Using a absolute Direct Drive Motor as an engine starter ensures that engine restarts are well-spoken and quick. Engine idle-stop is also entirely integrated into a operation of a Automatic Brake Hold system.
Additionally, a Direct Drive Motor acts as a generator, assisting to say a hybrid batteries during full assign to consistently support motorist final underneath roughly any condition—even while lapping a lane during full bore.
The Direct Drive Motor has a glass cooling thoroughfare that provides unchanging cooling, even when a element is being pushed to a limit, such as on a lane excursion.
9-Speed Dual Clutch Transmission
The NSX’s bespoke 9DCT plays a essential purpose in energetic performance, delivering lightning-fast and seamless up‑ and downshifts. The 9DCT works in unison with a Direct Drive Motor to make full use of a Sport Hybrid SH-AWD appetite unit’s extended appetite rope to furnish discerning and accurate rigging changes that support present acceleration responses.
The sum ratio operation with closely-spaced ratios enables a motorist to remove extent appetite from a NSX twin-turbo V6 engine. The smoothness programming selects a right rigging during a right time, or lets drivers name as they wish.
- First rigging is configured for extent car launch acceleration.
- The close-ratio gears (2nd–8th) are matched to make a many of a Sport Hybrid SH-AWD appetite unit’s appetite band. Top speed is achieved in 8th gear.
- High rigging (9th) has been optimized for still cruising and fuel potency during steady-state highway driving. When pushing in 9th rigging on a turn aspect during 60 mph, a twin-turbocharged 3.5-liter, V6 engine is spinning during usually 1,700 rpm.
9DCT rigging ratios
As a pivotal member of a Sport Hybrid SH-AWD appetite unit’s packaging, a 9DCT has been optimized for compress size, low mass and reduced overhang. The clutches and a differential are singly situated corresponding in a common housing, shortening distance and mass. The together missile blueprint reduces overhang from a back axle, enabling a 9DCT’s core of mass to be changed forward.
Top perspective of a 9DCT
Other modernized smoothness technologies incorporated into a 9DCT include:
- Electronically-operated twin soppy clutch, high-rigidity change fork, double-cone synchronizer and electronic change actuator work in unison to precisely synchronize change timing with Sport Hybrid SH-AWD appetite section torque for a quickest shifts possible
- Precision flush high-efficiency hypoid shelf rigging tooth figure for well-spoken operation and minimal rigging noise
- Use of twin oil “rooms” within a smoothness housing to support fit and high-capacity cooling
- Clutch box and differential conduit integrated into one smoothness wire for a lighter and some-more compress layout
- Lightweight, high-strength gearbox box
- Multi-plate LSD helps maximize accessible traction when accelerating and cornering during a boundary of tire adhesion
- The serve of a lightweight singular mass check for low sound and quivering levels
- Exclusive new rigging oil that improves lubrication while shortening drag around a rigging sight when compared to a compulsory heavier rigging oil that increases gelatinous drag
The 9DCT facilities highly-rigid change forks stoical of a specialized, high-strength expel iron that yield a well-spoken and discerning change response. The 9DCT uses a sum of 5 change forks for a rigging actuator system:
- A one-way purchase is used for 1st gear
- Four change forks are used for 2nd–9th gears
- A fifth change flare is used for Park and Reverse
A compress electric engine is used as a rigging actuator instead of a compulsory pneumatic or hydraulically-operated rigging actuator. This element reduces weight by expelling a high‑pressure hydraulic siphon that is typically used in a rigging actuator system. It also provides glorious trustworthiness and element robustness, generally in visit hard-driving sessions, compared to other accessible rigging actuation systems.
Electric Clutch Actuator
Like a electric motor-powered rigging actuator, a electrically‑operated purchase actuator eliminates a need for a high-pressure hydraulic pump. The purchase is tranquil by a closed-circuit hydrostatic structure, that enables oil vigour to be generated on demand, with larger efficiency.
Shift Characteristics Modification
Adding to a opening and changeable characteristics of a NSX modernized 9DCT, is a ability of a motorist to change change speed and opening with a Integrated Dynamics System:
- Quiet – Transmission change map leads rigging shifts during reduce engine speeds
- Sport – Transmission allows a engine to rev some-more openly and creates rigging changes in a aloft rpm range
- Sport+ – Accommodates aloft engine speed rigging changes with quicker, some-more aggressively executed upshifts and downshifts
- Track – Fastest upshifting; 40 milliseconds faster than Sport+ settings
The flywheel has been designed to act as a mass damper. This integrated partial is one of a many lightweight components that could be combined to minimize automatic and harmonic quivering caused by oscillation, thereby severely shortening noise, quivering and rudeness (NVH) while assisting to safeguard a constructional firmness and longevity of a smoothness case.
Limited Slip Differential
The remarkably frail branch capability and meekness of a all-new NSX is serve extended by a mechanically-based singular trip differential (LSD).
The LSD torque disposition ratio—an index for trip extent torque that compares torque shifted from a high revolution spindle to a low revolution axle—has been optimized to yield twin graphic LSD opening settings, ideal for when a wheels are being driven or when a car is coasting.
Engineered to element a TMU and VSA systems with pointing torque vectoring and extended traction maintenance, a LSD helps allege car opening in a series of pushing situations:
- Under Braking or Deceleration Approaching a Turn – Increases engine stop torque on a outward tire and circle for softened car stability
- Straight-Line Driving – Pre-load torque enhances car fortitude when pushing in a true line
- Under Acceleration while Turning – Overall car meekness and intrepidity is softened by changeable torque to a outward tire as traction from a inside tire decreases
Twin Motor Unit
The present and linear acceleration of a new NSX, joined with superb energetic capability is enabled in partial by a front-mounted TMU. Designed to be as tiny and lightweight as probable while delivering plenty torque and appetite and accurate torque vectoring to a front wheels, a TMU provides supplemental appetite in and with a twin-turbocharged V6 engine and Direct Drive Motor for evident acceleration whenever desired. The TMU can boldly dispense a torque to emanate a bend moment, enhancing cornering performance. Finally, a TMU recovers braking appetite during deceleration to supply appetite to a hybrid batteries.
“Using Honda’s strange beta process to cruise altogether doing performance, we’ve been exploring approach bend control torque vectoring for over twin decades,” pronounced Acura NSX Global Development Leader Ted Klaus. “With a growth of a Sport Hybrid Super Handling All-Wheel Drive System, we can take advantage of a aloft responsiveness of a electric engine characteristics within a element to significantly enhance a advantages of approach bend control.”
Inside a die-cast aluminum housing are twin electric motors positioned back-to-back. Each 36‑horsepower engine powers a singular front circle and can also request disastrous torque to a same wheel. A rigging resource allows a motors to decouple and still yield on-demand torque vectoring, assisting to urge potency in certain conditions.
The TMU, along with a 109 lb.-ft. torque-generating Direct Drive Motor, provides a bulk of a accelerative force during initial acceleration from a standstill. After a initial 0.15 seconds/0.1 G off a line, a high horsepower and torque from a twin-turbocharged V6 engine enters a fray, along with additional appetite from a Direct Drive Motor. From there, a engine exponentially increases a suit of appetite grant as a car continues a fast rate of acceleration.
The TMU is also a pivotal ground force for pushing in a Quiet mode environment of a Integrated Dynamics System, permitting for hushed, electric-only car operation for brief distances.
Intelligent Power Unit
Neatly finished in a cabin, only brazen of a back bulkhead, a Intelligent Power Unit (IPU) acts as a primary heart and smarts of a Sport Hybrid SH-AWD appetite unit, containing a following components:
- Lithium-ion battery pack
- Junction board
- High-voltage placement train bar
- DC/DC converter for 12V systems
- Electronic control units (ECU) for a electric engine and battery
When pushing in Sport, Sport+ and Track modes, a vehicle’s atmosphere conditioning element provides supplemental cooling of a IPU for optimal potency and performance. During development, a element was tested extensively in a dried feverishness of Dubai to safeguard a correct duty in impassioned ambient temperatures.
Lithium-Ion Battery Pack
Packaged within a IPU is a lithium-ion battery container that stores a electrical appetite to appetite a TMU and Direct Drive Motor. The high-output lithium-ion battery container consists of 4 modules, any with 18 particular battery cells contained within a specially-designed, caseless structure that utilizes a car physique itself for a lightweight nonetheless stout housing.
Based on a latest advances in lithium-ion battery record for automotive applications, both a certain and disastrous electrodes have been optimized for increasing appetite firmness and efficiency. Power outlay and potency of operation have been serve softened by implementing a mild battery cooling system, fed by uninformed cold atmosphere channeled into a newcomer cell around a vehicle’s atmosphere conditioning. Cool atmosphere from within a cabin circulates by ducting to cold both a lithium-ion batteries and a DC/DC converter.
Power Drive Unit
The Power Drive Unit (PDU) incorporates 3 apart inverters to modify approach stream to swapping stream for use by a Sport Hybrid SH‑AWD appetite unit’s 3 electric motors: a twin motors of a front-mounted TMU and a Direct Drive Motor. This compress “3-into-1” PDU pattern is vicious to a system’s compress wrapping and a ability to mountain it in a vehicle’s core hovel (beneath a core console).