Automatic Transaxle System: Description: Characteristics

HIVEC: Hyundai Intelligent Vehicle Electronic Control

It differs drastically compared to previous T/M such as alpha, Beta or KM series automatic transaxles.

All vehicles adopted with an engine volume of 2.0 liters or more has the HIVEC automatic transaxle developed and produced by Hyundai.

Some of the characteristics include:

Different power transfer
Different component layout
New shift logic (HIVEC) to improve shift feeling
Position of Valve Body
Variable shift pattern
Communication protocol and method

Fig 1: Automatic Transaxle System
Courtesy of HYUNDAI MOTOR CO.

ITEM SPECIFICATIONS

Item	Details
Weight Reduction	Aluminum oil pump 2.3kg Approx Pressed parts Retainer and hub of brakes and clutches Carrier of planetary gear set
Better shift quality	Independent control of clutches and brakes enabled better control of hydraulic pressure and skip shift possible (4 to 2, 3 to 1) During N to D or N to R shift, feedback control adopted. When starting from Creep condition, reduction of shock. (Creep condition is controlled with 1st gear) Solenoid valve frequency is increased for more accurate control. 35Hz to 61.3 Hz except DCCSV that is 35Hz. HIVEC adoption for better shift feeling. Variable shift pattern.
Increase in Power train efficiency	Variable oil level An oil dam is incorporated in the case to temporarily contain ATF, so the damage of power train is decreased at low temperatures
Dynamic drive by sports mode	Manual shifting possible Courtesy of HYUNDAI MOTOR CO.

Fig 2: Cross Sectional View Of Automatic Transaxle System

Courtesy of HYUNDAI MOTOR CO.