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Honda GP5 - Intelligent Dual Clutch Drive (i-DCD)

posted Feb 24, 2014, 7:39 AM by NEW - USED CARS FROM JAPAN   [ updated Feb 24, 2014, 7:49 AM ]

In combination, the 1.5 L Atkinson cycle DOHC i-VTEC engine; 7-speed DCT (Dual Clutch Transmission) with internal high-output motor; and IPU (Intelligent Power Unit) with internal lithium-ion battery deliver fuel economy of 36.4 km/L, the highest in Japan for a hybrid vehicle.
The electric servo braking system increases regeneration efficiency, while the fully electric compressor reduces engine load. These and other advanced technologies help the new hybrid system offer more than 35 percent higher fuel economy than Honda's previous IMA hybrid system.

+Maximum output
   73kW [100PS] /6,000rpm
+Maximum torque
   119N・m [12.1kgf・m] /5,000rpm

SPORT HYBRID Intelligent Dual Clutch Drive (i-DCD)

Honda GP5 - 7 Speed DCT with internal high-output motor
The seven-speed dual clutch transmission (DCT) fundamentally automates gear changes by using two clutches while retaining the structure, low power loss and strong acceleration of a conventional manual transmission. The DCT clutch is combined with a motor positioned at the end of the transmission, controlling the connection between the engine and motor. By clever gear arrangement, Honda has created a 7 speed DCT in a surprisingly short package.

7-speed DCT with high-output motor
Basic Structure and Operation
Gear shifts are performed by alternate use of two clutches: one for the odd- and one for the even-numbered gears. By readying the next gear to be connected, gear changes are immediate. The simple inter-gear structure minimizes power loss, increases fuel efficiency, and realizes a sharp response and direct acceleration feel.

With the SPORT HYBRID-iDCD, the odd and even axes are positioned in parallel, with a planetary first gear reducing the unit's length. The high-output motor is so small, it fits inside the transmission case.

        7-speed DCT with high-output motor

Short Unit Length by Housing Planetary First Gear within Motor
Honda has managed to create an extremely compact DCT unit by designing the first gear as a planetary gear, thus decreasing its size in relation to the constant mesh gears to the extent that it can be housed within the center space of the motor.

Structure of the 7-speed DCT with high-output motor
                                        Structure of the 7-speed DCT with high-output motor

Layout of the 7-speed DCT with high-output motor
The motor is connected to the odd-numbered gears, providing torque and electricity regeneration through gears 1, 3, 5, and 7.
7-speed DCT with high-output motor layout
                                                    7-speed DCT with high-output motor layout