CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM SYSTEM DESCRIPTION


  1. SYSTEM DESCRIPTION


    1. The K112 (CVT) is a fully electrohydraulically controlled metal belt type continuously variable transmission. This is a highly efficient transmission that is controlled in conjunction with the engine, contributing to enhanced fuel efficiency and quietness without shift shock.

      In addition, the CVT has the following features:


      • Diagnostic function

      • Fail-safe function when a malfunction occurs

  2. FUNCTION OF MAIN COMPONENTS

    Component Outline
    Shift solenoid valve DS1 Controls the oil flow to the primary pulley according to the vehicle speed and accelerator pedal position.
    Shift solenoid valve DS2 Controls the oil flow from the primary pulley according to the vehicle speed and accelerator pedal position.
    Shift solenoid valve SL Switches the usage of shift solenoid valve SLS.
    Shift solenoid valve DSU Controls the oil pressure for lock-up clutch engagement.
    Shift solenoid valve SLS Controls belt clamping pressure according to the input torque. Moreover, while the forward and reverse clutch is engaged, it controls the forward and reverse clutch oil pressure.
    Transmission revolution sensor (NIN) Detects the primary pulley revolution speed.
    Transmission revolution sensor (NOUT) Detects the secondary pulley revolution speed.
    Transmission revolution sensor (NT) Detects the input turbine revolution speed.
    CVT oil temperature sensor Detects the CVT fluid temperature.
    CVT oil pressure sensor Detects the CVT oil pressure for belt clamping force.
    Engine coolant temperature sensor Detects the engine coolant temperature.
    Throttle position sensor Detects the opening of the throttle valve.
    Stop light switch Detects the state of the brake pedal.
    Park/Neutral position switch Detects the position of the shift lever.
    ECM Controls the transmission based on the signal from each sensor. It has a diagnosis mode and fail-safe functions as a service when the system has malfunctioned.
    DLC3 Used for connecting the diagnosis tool to read diagnostic trouble code and ECM data.