Honda HR-V: CVT System Description - Power Flow (CVT)

P Position

Hydraulic pressure is not applied to the forward clutch and the reverse brake. Power is not transmitted to the secondary drive gear. The driven pulley is locked by the park pawl interlocking the park gear.

N Position

Engine power transmitted from the torque converter drives the input shaft, but the hydraulic pressure is not applied to the forward clutch and the reverse brake. Power is not transmitted to the drive pulley shaft.

Low Speed Range

• Hydraulic pressure is applied to the forward clutch, then the forward clutch engages the forward clutch hub/sun gear with the drive pulley shaft.
• The drive pulley shaft drives the driven pulley shaft linked by the steel belt.
• The driven pulley shaft drives the secondary driven gear via the secondary drive gear.
• Power is transmitted to the final drive gear, which in turn drives the final driven gear.
• At low speed range; pulley ratio high, the drive pulley receives lower pressure than driven pulley received pressure, the drive pulley applies the small-pulley-diameter to the steel belt.

High Speed Range

• Power flow to the final driven gear is the same as at the low speed range.
• As the vehicle speed is increased, the drive pulley pressure is increased by the CVT drive pulley pressure control solenoid valve, and the driven pulley pressure is decreased by the CVT driven pulley pressure control solenoid valve.
• At high speed range; pulley ratio low, the drive pulley receives higher pressure than driven pulley received pressure, the drive pulley applies the large-pulley-diameter to the steel belt.

R Position

• Hydraulic pressure is applied to the reverse brake, and the planetary carrier locks with the reverse brake.
• The ring gear joined with the forward clutch drum and the input shaft drives the sun gear via the planetary pinion gears.
• The sun gear rotates in the reverse direction from the input shaft rotational direction, and drives the drive pulley shaft.
• The drive pulley shaft drives the driven pulley shaft linked by the steel belt.
• The driven pulley shaft drives the secondary driven gear via the secondary drive gear.
• Power is transmitted to the final drive gear, which in turn drives the final driven gear.

CVT SYSTEM DESCRIPTION - SHIFT LOCK SYSTEM (CVT)

Shift Lever Assembly

The shift lever equips the shift lock function. Also, the parking pin switch is used for one of the key interlock system and installed on the shift lever, and sends the parking position signal (shift lever is in P position/mode) to the Multiplex Integrated Control Unit (MICU). The MICU controls that the ignition key can be pulled out from the key cylinder only when the shift lever is in P position/mode.

Shift Lock System

The shift lock system prevents the shift lever from moving unless certain conditions are met. The shift lock solenoid is normally OFF. After starting the engine in P position/mode, the shift lock stop prevents the shift lever from moving to any other positions / modes from P position/mode. When the brake pedal is pressed and the accelerator pedal is not pressed, the PCM commands the shift lock solenoid ON; the shift lock solenoid plunger in the shift lock solenoid pulls the shift lock stop to release the lock pin. Pressing the shift lever button allows the shift lever to move to any other positions / modes. When the brake pedal and the accelerator pedal are pressed at the same time, the PCM commands the shift lock solenoid OFF and the shift lock system is locked.

Shift Lock Release

When the shift lock system does not operate due to mechanical or electrical problem, you can unlock the shift lock temporarily by inserting the ignition key into the shift lock release hole and pressing the shift lock release. When the shift lock release is pressed, the shift lock stop releases the lock pin, and the shift lever can move to any other positions / modes.

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