Gear System Description - Power Flow

P and N Positions/Modes 

The traction motor does not rotate; motor power is not transmitted to the countershaft. When the battery module SOC value is low, the engine will run. Engine power transmitted from the flywheel drives the input shaft and generator shaft, but the hydraulic pressure is not applied to the over drive clutch. Power is transmitted from the engine to the generator motor. In P, the motor shaft is locked by the parking brake pawl interlocking the parking gear on the motor shaft.

Courtesy of HONDA, U.S.A., INC.

D Position/Mode 

In D, the optimum drive mode is automatically selected for different driving conditions from the EV drive mode, the HV drive mode, and the engine drive mode.

In EV Drive Mode 

• Engine does not run; power is not transmitted from the flywheel.
• Traction motor rotates; power is transmitted to the motor shaft.
• Motor shaft transmits the motor power to the countershaft and the final drive gear, which in turn drives the final driven gear.

Courtesy of HONDA, U.S.A., INC.

In HV Drive Mode 

• Engine runs; power is transmitted from the flywheel.
• Traction motor rotates; power is transmitted to the motor shaft.
• Engine power transmitted from the flywheel drives the input shaft and generator shaft, but hydraulic pressure is not applied to the over drive clutch.
• Power is transmitted from the engine to the generator motor.
• Motor shaft transmits the motor power to the countershaft and the final drive gear, which in turn drives the final driven gear.

Courtesy of HONDA, U.S.A., INC.

In Engine Drive Mode 

• Engine runs; engine power transmitted from the flywheel drives the input shaft.
• Hydraulic pressure is applied to the over drive clutch, then the over drive clutch engages the over drive gear with the input shaft.
• The input shaft drives countershaft via the over drive gear.
• Power is transmitted from the countershaft to the final drive gear, which in turn drives the final driven gear.

Courtesy of HONDA, U.S.A., INC.

R Position/Mode 

In R, the vehicle runs only with the traction motor. The power flow through the transmission for reverse is identical in D. Reverse operation is enabled by reversing traction motor direction.

In EV Drive Mode 

• Engine does not run; power is not transmitted from the flywheel.
• Traction motor rotates to the reverse direction in D; power is transmitted to the motor shaft.
• Motor shaft transmits the motor power to the countershaft and the final drive gear, which in turn drives the final driven gear.

Courtesy of HONDA, U.S.A., INC.

In HV Drive Mode 

• Engine runs; engine power transmitted from the flywheel drives the input shaft and generator shaft, but hydraulic pressure is not applied to the over drive clutch.
• Power is transmitted from the engine to the generator motor.
• Traction motor rotates to the reverse direction in D; power is transmitted to the motor shaft.
• Motor shaft transmits the motor power to the countershaft and the final drive gear, which in turn drives the final driven gear.

Courtesy of HONDA, U.S.A., INC.

Regenerative Braking 

• When the vehicle is decelerating, the front wheels drive the final driven gear.
• The final driven gear drives the countershaft and the motor shaft.
• Power is transmitted from the front wheels to the traction motor.

Courtesy of HONDA, U.S.A., INC.