Detroit DT12 Transmission December 2016

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Detroit DT12 Transmission

The Detroit Transmission is a 12 speed, direct- or over-drive automated manual transmission available in Freightliner Cascadia and Western Star 5700XE.

DT12 –1750 – DH 1

Detroit Transmission 12 speed Input torque Direct Drive Highway Applications

DT12 combines a clutch-actuated manual-style gearbox, with computer controlled shifting and clutch control. The electronic controls select the right shift pattern for fuel economy or power.

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DT12 Provides Features for: • Fuel Efficiency • Performance and Comfort • Safety

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Features and Benefits

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Fuel Efficiency • Powertrain communication: high speed

engine-transmission-communication for improved use of engine power to improve performance and fuel economy

• eCoast: transmission automatically shifts to neutral while coasting to save fuel.

• Skip Shift: transmission electronics command to "skip gears" to avoid unnecessary shifts for improved fuel economy and performance

• Intelligent Powertrain Management (IPM4) knows the route ahead and will pre-select gears, eCoast, and engine braking to maximize efficiency.

• Close the Gap in Fuel Economy

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Powertrain Communication

The ability for the transmission and engine to share information and offer complimentary functions gives the Detroit transmission an advantage no other supplier can offer.

• Dedicated powertrain communication does not use J1939

Common Powertrain Controller

Motor Control Module

Transmission Control Module

Based on input from the vehicle operator, and detailed knowledge of the vehicle, the electronic controls can command:

• Engine torque limiting to reduce driveline damage and shift more smoothly • Transmission shift points to keep RPMs in the sweet spot

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When coasting down grades or reducing speed, the eCoast function of the DT12 transmission temporarily opens the driveline

• Disengaging the powertrain saves fuel

• Vehicle momentum is preserved

• Appropriate gear is always selected upon acceleration

eCoast

eCoast Conditions

• Minimum vehicle speed threshold is exceeded

• Vehicle acceleration and engine speed limit is not exceeded

• No accelerator pedal, brake pedal, or engine brake input

• Upcoming eCoast event exceeds a minimum estimated time requirement

• No active regeneration

• Weight does not exceed 100,000 lbs.

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Skip Shifting The DT12 can skip unnecessary gears under low loads or running bobtail

• Reduced gear steps keep engine in sweet spot, increasing efficiency

• Ability to run through lower gears faster to achieve cruising speed sooner

• Less shifting creates smoother driving and increased acceleration

• Ability to choose appropriate start gear based on load and grade inputs

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The purpose of Intelligent Powertrain Management (IPM) is to use the momentum of the vehicle most efficiently by eliminating unnecessary fueling, engine braking and shifting while minimizing the impact on travel time. • IPM is feature of cruise control that uses terrain maps and GPS to know the route

ahead up to 1+ miles (2 KM)

• IPM uses shifts, acceleration, engine braking and coast versus eCoast optimization to efficiently operate the powertrain.

What is DT12 Intelligent Powertrain Management?

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Prediction of route including GPS electronic maps

Horizon Data

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• Only active in cruise control

• Uses kinetic energy of the vehicle to save fuel in most optimal fashion

• Works to prevent unnecessary: engine brake events, shifts, and fueling

• Logic is designed to minimize the increase in travel time

• Maps in software do not need updating like other GPS products

Intelligent Powertrain Management with DT12

Red - FC1 - 100% covered Yellow – FC2 - 100% covered Green – FC3 - 40% covered

IPM Road Coverage

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Detroit Transmission Fluid The DT12 uses a fully synthetic oil to further increase:

Fuel Efficiency

• Lower viscosity oils that are synthetically engineered for their application reduce friction and pumping inefficiencies, using less fuel to turn the transmission

Reliability

• Synthetic oils are engineered to clean contaminates and dissipate heat more effectively, leading to longer transmission life

ONLY use MB 235.11 spec oil in the DT12

Different spec oils will:

• Not provide the same fuel efficiency

• Affect reliability by deteriorating gaskets and seals

• Break down further before the maintenance interval

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Features and Benefits

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• Active Driveline Protection: Transmission Control Module calculates the torque wind-up in the driveline and regulates with engine torque control for enhanced driving comfort and less driveline wear

• Driving Mode (Econ vs. Perf): depending on application customer can choose between eco and power-mode configuration

• Kick-Down: allows for improved vehicle acceleration

• Pneumatic clutch and shift actuation: allows faster gear shifts compared to electronic actuation

• Helical gears and geometrical optimized gear-cut for noise reduction and efficiency

• Creep mode allows enhanced slow speed maneuvering through speed-adapted clutch control

Performance & Comfort

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DT12 Clutch

The DT12 uses a ceramic-metallic faced clutch, in both single or dual plate configurations. With a Concentric Pneumatic Clutch Actuator (CPCA), precise computer control allows for long-lasting operation and superior shifting and traction control.

• Clutch warranty is 3 years or 300,000 miles

• Detroit recommends replacing the clutch at 750,000 miles

Detroit Dual Plate Clutch DD15 above 105k GCW, all DD16

Diameter 15.75” (400mm)

Additional Weight 70 lbs. (32kg)

Detroit Single Plate Clutch DD13, DD15 below 105k GCW

Diameter 16.93” (430mm)

Weight

113 lbs. (51 kg)

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Shift Boost Mode

The DT12 shifts noticeably smoother than other automated transmissions. In addition to pneumatic shift and clutch actuators, the engine and transmission work together to ensure the smoothest shifts possible. The engine will:

• Brake 3 cylinders and fire 3 cylinders, to maintain turbo boost and fuel pressure

• Speeds up time-to-target during up-shifts under load – FASTER SHIFTING

• Preserves boost energy allowing quicker torque ramp-up – QUICKER TORQUE BUILD-UP

• Pre-loading of driveline allows smoother shifts under full load – SMOOTH ENGAGEMENT

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Creep Mode

Although the clutch slips to transfer limited torque, the TCM constantly monitors load and temperature.

The DT12 will not allow the clutch to be damaged by Creep Mode, and will abort if damage is imminent.

The Creep Mode of the transmission simulates a torque converter in an automatic transmission to improve low speed maneuverability for parking, docking, heavy traffic, or other low speed situations.

5555555 mi

10A econ

CRITICAL! ClutchOverloaded!

5555555 mi

10A econ

Creep Mode Aborted !

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Features and Benefits

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Safety

• True two-pedal system for ease of operation and reduced driver fatigue

• Hill Start Aid (HSA): prevents roll back after

standing still on a hill

• Auto Neutral: transmission electronics command "Neutral" gear when certain conditions apply, e.g. parking brake is engaged or vehicle shut-down

• Shift lever with gear, auto/manual mode and engine brake selection improves ergonomics

• Reduces New Driver Training

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Hill Start Aid (HSA)

When transitioning from a standstill to acceleration on a grade of 3% or more, Hill Start Aid acts as a brake assist feature to prevent rollback for up to 3 seconds.

The ABS module holds and modulates brake pressure after the driver has released their foot from the brake pedal.

Creep-Mode works in combination with Hill Start Aid to achieve proper:

• Acceleration / Torque

• Brake modulation transition to clutch control

• and slowly moving the vehicle forward.

HSA is enabled (hold brake pressure) with the following conditions:

• Brake pressure exists

• Vehicle is not moving

• No ABS system faults are active

• HSA switch is not disabled

Smooth and Safe Transition from Brake to Throttle

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Auto Neutral

The TCM will automatically shift the transmission into neutral in certain conditions:

• While the shifter is in drive or reverse position

• If the transmission was mistakenly left in gear

• When the ignition switch is turned off

When the operator has applied the parking brake while the stalk is in drive or reverse, the dash will flash “N” for neutral after 5 seconds and a quick “beep” will be sounded.

After an additional 5 seconds without driver interaction, an additional “beep” will be sounded and the DT12 will shift into neutral.

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Shifter Stalk

Engine Brake + Upshift - Downshift

Drive Direction: D: Drive or forward N: Neutral R: Reverse

Shift Mode: A: Automatic M: Manual

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How the DT12 Reduces Driver Training

• A two pedal system eliminates manual shifting and is simple to learn/operate

• DT12 offers creep mode for slow speed maneuvers

• All safety, comfort and performance features allow the driver to keep his hands on the wheel and eyes on road

• Intelligent dash provide real time feedback on transmission operation

The DT12 offers many advances to allow less experience drivers to drive like seasoned veterans. Allowing fleets to invest less resources in driver training.

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The driver can hold a gear while descending a grade, if:

• In Auto shift mode (econ or perf)

• Cruise control is off

Then by pushing the shifter forward to manually downshift

• The shifter does not need to be held

Gear Hold

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That gear will be held for ten seconds

It can be held for longer if the engine brakes or service

brakes are being used

1. After ten seconds 2. Without engine or service

brakes

The vehicle will return to auto gear selection

5555555 mi

10A econ

ReduceEngine RPM

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Cruise Descent Descent control will help control your vehicle and engine speed when descending a grade

Note: Descent control does not use the CC band switch and does not fuel the engine on the descent

1. Determine appropriate descent speed 2. Turn on engine brakes (actively working) 3. Set cruise speed

4. Apply service brakes if necessary 5. Afterwards, turn off engine

brakes 6. Descent speed becomes the new cruise speed

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Setting When to Use Default Speed Range

Low Steep Grades Set speed + 3 mph

Medium* Rolling Hills Set speed +5 mph

High Flat Terrain No Limit

Topo

grap

hy

s Drive

Altitude

Optional Feature: Cruise Control Band Switch

Brake Coast Drive

Speed 45mph

Speed 47mph

Speed Low 48mph

Speed Mid 48 mph Speed 45mph

Cruise Control

Set Speed

Speed Low 48mph

Speed Mid 50 mph

Speed High 50+ mph

CC BAND

HIGH MED LOW

CC-band switch controls when the engine retarder will be engaged above the set vehicle cruise speed

*standard setting without CC switch

Rocker switch

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Specifications

DT12DA

Available in: 1. application approval required for GCW applications >110k - up to 140k 2. with dual plate clutch >105k

DT12OA

DT12DB

DT12OB

Max Input Torque (lb/ft.)

Ratio Range Max GCW

(lbs.) Weight (lbs.)

Oil Capacity (quarts)

2,050 14.93 – 1.00 80,000

755 15.4

2,050 11.64 – 0.78 130,0001,2

1,550 14.93 – 1.00 80,000

625 10.7

1,650 11.64 – 0.78 80,000

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Summary

• Automated manual transmissions offer all the benefits of automatics and manuals

• The Detroit DT12 is loaded with features improving both efficiency and performance

• Integrated with Detroit engines, the entire powertrain works together

• Legendary service and support

• Hundreds of dealers, comprehensive warranty

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Resources

• https://demanddetroit.com/resources/ (right click and select open hyperlink)

• Driver Training Videos, Product Videos, Product Brochures & Product Overviews (Spec Sheets)

• https://www.dtnadash.com/ (right click and select open hyperlink)

• Driver Training Videos, Product Videos, Product Brochures & Product Overviews (Spec Sheets), Dealer Sales Presentations

• FST or WSST App on iPad

• Driver Training Videos, Product Videos, Product Brochures & Product Overviews (Spec Sheets), Dealer Sales Presentations, Calculators