SSANGYONG KYRON 2007.04 Manual page 569

01-5
3410-01
1. DESCRIPTION AND OPERATION OF AUTOMATIC
TRANSMISSION
The ION (BTR) Four Speed Automatic Transmission is an electronically controlled overdrive
four speed unit with a lock-up torque converter. The lock-up torque converter results in lower
engine speeds at cruise and eliminates unnecessary slippage. These features benefit the
customer through improved fuel economy and noise reduction.
Of primary significance is the Transmission Control Module (TCU) which is a microprocessor
based control system.
Max. Power (kW) Configuration
260 mm Torque
Converter-Wide
320 160
Ratio Gear Set
Splined Output for
Transfer Case
The TCU utilizes throttle position, rate of throttle opening, engine speed, vehicle speed,
transmission fluid temperature, gear selector position and mode selector inputs, and in some
applications a Kickdown Switch to control all shift feel and shift schedule aspects.
The TCU drives a single proportional solenoid multiplexed to three regulator valves to control
all shift feel aspects. The output pressure of this solenoid is controlled as a function of
transmission fluid temperature to maintain consistent shift feel throughout the operating
range.
Shift scheduling is highly flexible, and several independent schedules are programmed
depending on the vehicle.
Typically the NORMAL schedule is used to maximize fuel economy and driveability, and a
POWER schedule is used to maximize performance. WINTER schedule is used to facilitate
starting in second gear.
ION 4-SPEED
KYRON 2007.04