Understanding the Honda Hybrid E-Drive

See the cool E-Drive transmission used in the 2020 Honda CR-V Hybrid, Accord Hybrid, Insight Hybrid, and Clarity Plug-In Hybrid. Watch how this incredible transaxle functions in all three modes of operation. Clarifications. - E-Drive and eCVT are training and marketing terms used on the Honda.com sales website and in Honda technical training to describe this system. - Intelligent Multi-Mode Drive (i-MMD) is an engineering term to describe this system. CORRECTIONS: - Mode 2, Engine Drive Mode. The internal combustion engine (ICE) will operate at its most efficient rpm for the torque required to propel the vehicle. The motor is forced to rotate by the countershaft. The motor can draw power from the battery to help the engine supply torque to the countershaft (parallel hybrid operation), or it can act as a generator to supply power to the battery. Engine-only mode can occur at speeds as low as ~70.8 km/h (~44 mph). - Mode 3, E-CVT. At higher vehicle speeds, the overdrive clutch is disengaged. The generator provides power to the motor (series hybrid operation), to the battery, or to both depending upon the battery state of charge, motor load, and other factors. TIMELINE: 0:00 Start 0:12 Introduction 0:25 Vehicle Usage 0:51 Three modes of operation 1:42 Mode 1 - Electric Vehicle (EV) Mode 1:56 Two Oil Pumps 2:14 Final Drive and Driven Gears 3:28 Final Drive gear ratio = 65/19 = 3.421:1 (CR-V 66/17 = 3.882:1) 4:21 Counter Shaft Gear 5:22 Motor Drive Gear and shaft 6:30 135kW Motor power and torque ratings 7:17 Motor shaft gear to countershaft gear ratio = 54/22 = 2.455:1 7:53 MUST SEE: Motor shaft gear to final drive gear ratio = 8.398:1 (CR-V 9.530:1) 9:30 MUST SEE: Regenerative braking gear operation 10:20 Mode 2 - Engine Only Mode 11:42 How the engine is connected to the countershaft 14:00 MUST SEE: Overdrive clutch pack demonstration 16:00 Overdrive gear to countershaft gear ratio = 54/67 = 0.8059:1 17:00 Overdrive gear to final drive gear ratio = 2.757:1 (CR-V 3.129:1) 18:18 Power Generation 18:38 Input shaft gear to generation drive gear ratio = 39/76 = 0.513:1 19:15 106kW Power generator rotor 20:35 Final Assembly of parts - Parking Gear and Pawl 22:04 Mode 3 - E-CVT Mode 22:40 MUST SEE: Series Hybrid operation 23:45 Wrap up ABOUT US Weber State University (WSU) Davis Campus - Automotive Technology Department - Advanced Vehicles Lab. A technical description and demonstration of the Honda E-Drive transaxle. We teach current vehicle technologies to our automotive students at Weber State University and online. For more information visit: http://www.weber.edu/automotive This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see http://www.weber.edu/automotive/J_Kelly.html ADDITIONAL TRAINING FOR YOU Join us for hybrid and electric vehicle training with two online courses and in a 5-day on-campus boot camp with Professor John D. Kelly. See http://www.weber.edu/evtraining DONATE TO OUR DEPARTMENT Please consider a donation to the Department of Automotive Technology at Weber State University here: http://advancement.weber.edu/Automotive QUESTIONS FOR TEACHERS 1. What is the name of the Mode-1 operation? 2. What is the overall gear ratio from the 135 kW motor to the tires in Mode-1 on the CR-V Hybrid? 3. What is an advantage of Mode-1 operation? 4. What is the name of the Mode-2 operation? 5. What transmission part enables Mode-2 operation? 6. What is the overall gear ratio from the overdrive gear to the tires in Mode 2 on the CR-V Hybrid? 7. What is an advantage of Mode-2 operation? 8. What happens to the 106 kW generator during the mode-2 operation? 9. What is the name of the Mode-3 operation? 10. What is unique about the Mode-3 operation? 11. What is an advantage of Mode-3 operation?