Continuously Variable Transmission/Transaxle: Description and Operation
GENERAL INFORMATIONF1CJA model has been established.
TRANSAXLE
The transaxle consists of the torque converter and gear train. The three element, one-stage, two-phase type torque converter with a built-in torque converter clutch has been adopted. The gear train of F1CJA transaxle consists of 1 set of multi-disc type clutches, 1 set of multidisc type brakes, and 1 set of planetary gears which are composed of a sun gear, carrier, annulus gear, 2 sets of pulleys and 1 set of steel belts.
TRANSAXLE CONFIGURATION DRAWING
COMPONENTS AND FUNCTIONS
Component Function
Forward clutch Operates when moving forward and rotates the primary pulley normally.
Reverse brake Operates when moving backward and rotates the primary pulley reversely via the planetary gear.
Primary pulley Transfers the rotation from the planetary gear to the secondary pulley via the steel belt.
Steel belt Transfers the rotation from the primary pulley to the secondary pulley.
Secondary pulley Transfers the rotation from the primary pulley to the differential.
SECTIONAL VIEW
ELECTRONICALLY-CONTROLLED SYSTEM
INVECS-III CONTROL
INVECS-III has been newly developed based on
INVECS-II utilizing continuous variable characteristics of CVT
To select the pulley ratio which can provide the driving force corresponding to the driver's intention and vehicle conditions, TCM selects the optimal pulley ratio and determines the shift strategy to obtain it by detecting the vehicle driving conditions such as the vehicle speed, accelerator angle. Then, it outputs the command to the stepper motor, controls in/out flow of the line pressure to/from the primary pulley, positions the movable pulley of the primary pulley, and controls the gear ratio.
ENGINE BRAKE FEATURE ON THE DESCENDING SLOPE
Pulley ratio is controlled to obtain the engine brake suitable for the driver's feelings.
Engine brake learning feature on the descending slope
Learning compensation is made to meet the tastes of a driver by judging the amount of the engine brake from the application of the accelerator or the brake.
DRIVING FEATURE ON THE ASCENDING SLOPE
If the foot leaves the accelerator pedal during driving on the ascending slope (called lift foot), driving capability is secured by preventing excessive upshifting.
Learning feature corresponding to tastes and habits of drivers
Ratio patterns are continuously switched according to the driving method of a driver.
SYSTEM CONSTRUCTION DIAGRAM
RATIO PATTERN
[2.0L ENGINE - D RANGE]
The shift change is performed in the entire shift range from the lowest to the highest pulley ratio.
[2.4L ENGINE - D RANGE]
[L RANGE (VEHICLES WITHOUT SPORT MODE)]
By limiting the shift range to the area around the lowest pulley ratio, the powerful driving force and engine brake is secured.
[SPORT MODE (VEHICLES WITH SPORT MODE)]
When the sport mode is switched ON with the selector lever or paddle shift, the fixed shifting line is determined. The upshift/downshift operation enables to shift in steps according to the predetermined shifting line, providing M/T-like shifting. The 6-speed transmission which is suitable for sporty driving is adopted.
DIRECT CONTROL (TORQUE CONVERTER CLUTCH CONTROL)
[2.0L ENGINE]
By carefully controlling the direct operating pressure depending on the driving conditions, the shock-free direct operation from low speed has been achieved.
[2.4L ENGINE]
