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2014 Honda Accord Hybrid Has No Transmission: How It Works

 
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2014 Honda Accord Hybrid

2014 Honda Accord Hybrid

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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 system

2014 Honda Accord Hybrid motor system

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Core to the system is that couplet of electric motors (we call it that because of how neatly they're packaged and nested together), of which one is always connected to the wheels. One of them drives the vehicle—the propulsion motor—while the other stays connected to the engine and functions primarily as a generator.

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 configuration

2014 Honda Accord Hybrid i-MMD configuration

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