See the impressive Hybrid 7-Speed Dual-Clutch Transmission (DCT) used in the Acura MDX Sport Hybrid and the Acura RLX Sport Hybrid. Watch how this complex transaxle functions mechanically and with the assistance of an electric motor.
Clarifications.
- E-Drive is a marketing term used on the Acura.com sales website to describe this system.
- Intelligent Dual Clutch Drive (i-DCD) is an engineering term to describe this system.
TIMELINE:
0:00 Start
0:12 Introduction
1:52 Performance differential and counter gear
3:48 Secondary shaft for even-numbered gears
4:10 Main shaft for odd-numbered gears
4:43 Dual-clutch components and operation
6:50 The clutch pack for the odd-numbered gears
7:25 The clutch pack for the even-numbered gears
8:20 Power flow from the engine to the main shaft for odd-numbered gears
8:40 Power flow from the engine to the secondary shaft for even-numbered gears
9:54 Recommended automatic transmission fluid - Honda ATF DW-1
10:30 MUST SEE: Dual hydraulic apply pistons for dual-clutch packs
13:17 How power is transferred in the even-numbered gears
18:02 How power is transferred in the odd-numbered gears
21:20 MUST SEE: electric motor assist
22:31 Planetary gear set for first gear and power transfer from motor
24:10 First gear operation and calculations
25:50 Second gear operation and calculations
27:56 Third gear operation and calculations
29:34 Fourth gear operation and calculations
30:30 Fifth gear operation and calculations
31:30 Sixth gear operation and calculations
32:30 Seventh gear operation and calculations
33:20 How the electric motor contributed power in all gears
34:24 The reverse gears and the gear ratio mystery 3.66:1?**
35:37 Summary and Three modes of operation
36:27 The motor stator and case
36:49 Wrap-up
**The reverse mystery has been solved! A big thank you to Michel Kraus. Solution: "Even Gears" clutch engaged to the reverse idler to the reverse gears to the planetary gear set to the 5th gear. (54/34) * (51/54) * (35/63) * (1+(111/39)) * (48/42) = 3.663003663:1
ABOUT US
Weber State University (WSU) Davis Campus - Automotive Technology Department - Advanced Vehicles Lab. A technical description and demonstration of the Acura Integrated Motor Dual Clutch Transmission (DCT) used in the 2018 - 2020 Acura MDX Sport Hybrid and the 2014 - 2020 Acura RLX Sport Hybrid. We teach current vehicle technologies to our automotive students at Weber State University and online. For more information visit:
This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see
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