2014 Honda Accord HybridEnlarge Photo
The 2014 Honda Accord Hybrid has no transmission.
To be more precise, there's nothing in a form we'd normally recognize as a transmission—no conventional automatic transmission, no automated dual-clutch system, no belt-and-pulley continuously variable transmission (CVT) either. There's no torque converter, either—not even a drive clutch to slip the engine from a standing start.
Enough about what the Accord Hybrid doesn't have; here's what it does have: In addition to a lean four-cylinder engine, there are twin electric motors (each purposed and configured differently), a compact 1.3-kWh battery pack, and an electronically controlled clutch pack.
Not related to IMA; this one's a 'full hybrid'
The hybrid system in the 2014 Honda Accord Hybrid is an all-new one—completely different than the familiar Integrated Motor Assist (IMA) setup that's been used in a wide range of Honda (and Acura) products over the years. This vehicle (and the Accord Plug-In Hybrid) have a system called Intelligent Multi-Mode Drive (i-MMD).
2014 Honda Accord Hybrid motor systemEnlarge Photo
The gasoline engine in the 2014 Honda Accord Hybrid is a 2.0-liter in-line four, with i-VTEC intelligent valve timing and lift and an Atkinson-cycle. It makes a peak 141 horsepower and 122 pound-feet of torque, and it's not mechanically connected to the drive wheels under most driving conditions.
But in steady-speed highway cruising a multi-plate wet clutch and controller system connect it—essentially in a direct-drive configuration that's about equivalent to the top gear in conventional transmissions.
This unique arrangement essentially creates four different drive modes: Electric Vehicle (EV). Hybrid Vehicle (HV), Engine mode, and Regeneration mode.
2014 Honda Accord Hybrid i-MMD configurationEnlarge Photo