AUTOMATIC TRANSMISSION BLOCK DIAGRAM


BHE051301026T06

1
Input signal
2
Turbine sensor
3
TR switch
4
M range switch
5
TFT sensor
6
Oil pressure switch
7
CAN communication
8
Input: throttle opening signal
9
Output: range signal, turbine speed signal
10
AT control system
11
On-board diagnostic system
12
Output signal
13
Pressure control solenoid
14
Shift solenoid A
15
Shift solenoid B
16
Shift solenoid C
17
Shift solenoid F
18
TCC solenoid
19
Vehicle speed signal
20
Instrument cluster
21
AT warning light

Electronic Control Item and Contents

Control Item

Contents

Shift control
• Detects engine load and vehicle speed, and switches to optimum gear in accordance with preset shift program
Line pressure control
• Switches between high and low line pressure to suit engine load and vehicle speed, according to on/off pressure control valve solenoid
Direct electronic shift control
• Regulates clutch pressure to suit engine load and driving conditions, according to duty cycle solenoids (shift solenoids A, B, C, F) and amplifier valve of clutches, and electronically controls clutch engagement and release directly
Feedback control
• Performs real-time feedback correction for clutch engagement pressure to achieve target shifts
• Corrects clutch engagement pressure and timing on drain side to compensate for changes in engine performance and changes in transmission
Engine-transmission total control
• Optimally controls engine output torque when shifting
• Operates optimal clutch engagement pressure corresponding to engine output torque
TCC control
• Controls TCC smoothly by duty cycle TCC solenoid, in accordance with designated TCC points
Slope mode control
• Changes the shift point to prevent frequent shifting up/down when climbing hills
OBD system
• Parts essential for EC-AT control have a self-diagnosis function, which, in the event of trouble, illuminates the AT warning light to warn the driver, and stores the DTC in the TCM
• If it is determined by self-diagnosis that trouble has occurred, the system performs controls to maintain drivability

Component Description (Electronic Control)

Part name

Function

Input system
VSS
• Detects output shaft revolution speed
Turbine sensor
• Detects reverse and high clutch drum (input) revolution speed
TR switch
• Detects selector lever ranges/positions
M range switch
• Selects driving modes (M range) and changes driving patterns
TFT sensor
• Detects ATF temperature
Oil pressure switch B
• Detects pressure applied to 2-4 brake
Oil pressure switch C
• Detects pressure applied to high clutch
Oil pressure switch F
• Detects pressure applied to low and reverse brake
CAN communication
Throttle opening signal *1
• Input throttle opening angle from PCM
Engine speed signal
• Input engine speed signal from PCM
Engine torque signal
• Input engine torque signal from PCM
Brake switch
• Detects the brake pedal depressed
Cruise control signal
• Detects cruise control is in use
Engine coolant temperature signal
• Input engine coolant temperature signal from PCM
Output system
ON/OFF type
Pressure control solenoid
• Switches line pressure between high and low
Duty type
Shift solenoid A
• Controls amplifier valve to regulate low clutch pressure
Shift solenoid B
• Controls amplifier valve to regulate 2-4 brake pressure
Shift solenoid C
• Controls amplifier valve to regulate high clutch pressure
Shift solenoid F
• Controls amplifier valve to regulate low and reverse brake pressure
TCC solenoid
• Controls TCC engagement and disengagement
CAN communication
AT warning light
• Illuminates when failure is detected by diagnosis function
Reduce torque signal
• Sends signals to the PCM during shifting
Range signal
• Illuminates to selector indicator light
Turbine speed signal
• Output turbine speed signal to PCM

*1 :
There are two throttle opening angle signals. One is based on the accelerator pedal opening angle and the other is based on the throttle valve opening angle.