On Vehicle Service

GENERAL DESCRIPTION





The A/T come in one model, namely F4A42.

TRANSAXLE
The transaxle is made up of the torque converter and gear train. A 3-element, 1-step, 2-phase torque converter with built-in torque converter clutch is used. The gear train is made up of three sets of multi-plate clutches, two sets of multi-plate brakes, one set of one-way clutches and two sets of planetary gears. The planetary gears are made up of sun gears, carriers, pinion gears and annulus gears.





TRANSAXLE CONFIGURATION DRAWING





COMPONENTS AND FUNCTIONS

FUNCTION ELEMENT TABLE








x: Function element

NOTE: *operates only when the vehicle is stationary let approximately 10 km/h (6.2 mph) or less].





SECTIONAL VIEW


ELECTRONICALLY-CONTROLLED SYSTEM
INVECS-II





^ When in drive ("D" range), the new automatic transmission employs an innovative shift schedule to provide a high level of comfort and "easy driving style" that matches all driving conditions as well as the driver's driving style.
^ INVECS-II features "Optimum Shift Control," which provides shift timing the average driver perceives to be the optimum timing under any road conditions "Adaptive Shift Control," adjusts shift timing to match the driving habits and preferences of individual drivers.

FEATURES
OPTIMUM SHIFT CONTROL





1. The shift patterns found satisfying by the typical driver for all ranges of driving are stored in the computer's memory. The computer uses this data to analyze road conditions and the driver's style of operation, and then outputs the optimal shift patterns stored in its memory to best match the conditions.





2. We introduce the latest in control technologies with an innovative new algorithm called the "neural network" that works to imitate the decision-making processes of the human brain. The neural network links a wide variety of input data regarding road and operating conditions, and instantly makes accurate shift control decisions.

ADAPTIVE SHIFT CONTROL
1. The computer learns the driving habits and preferences of each individual driver by processing driving data on engine output, tire load, foot brake operation, etc. It then uses this data to adjust shift timing to best suit the driver's style.
2. If the computer determines from the driving patterns that the driver is one who enjoys a relaxed, unhurried style, it adjusts timing to execute up-shifts at a lower engine speed to provide a smooth, quiet ride. On the other hand, if the computer determines the driver to prefer a sporty ride, it adjusts timing to shift up at a higher engine speed to provide more powerful response.
3. If the computer determines that the driver tends to apply the brakes often on a descending roadway, it adjusts timing to down shift sooner so that engine braking is more effectively applied. Conversely, if the computer determines that the driver does not brake much while driving downhill, it delays downshifting to minimize the effect of engine braking.








ADAPTIVE SHIFT CONTROL ON DOWNGRADES





SYSTEM CONSTRUCTION DIAGRAM

SHIFT PATTERN CONTROL

UPSHIFT PATTERN





NOTE: Within 2 -to- 3 and 3 -to- 4 movement ranges, the PCM adjusts shift points according to the driving conditions by memorizing the accelerator pedal stroke and braking timing.





DOWNSHIFT PATTERN