Infiniti QX56 (JA60). Manual — part 930
TM-22
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
Input/Output Signal of TCM
INFOID:0000000005148512
*1: Spare for output speed sensor
*2: Spare for accelerator pedal position signal
*3: If these input and output signals are different, the TCM triggers the fail-safe function.
*4: CAN communications
*5: Used as a condition for starting self-diagnostics; if self-diagnostics are not started, it is judged that there is some kind of error.
*6: A/T fluid temperature sensor 2 does not have any function.
Line Pressure Control
INFOID:0000000005148513
• When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM, the TCM
controls the line pressure solenoid.
Control item
Line
pres-
sure
control
Vehicle
speed
control
Shift
control
Lock-up
control
Engine
brake
control
Fail-safe
function
(*3)
Self-diag-
nostics
function
Input
Accelerator pedal position signal
(*4)
X
X
X
X
X
X
X
Output speed sensor
X
X
X
X
X
X
Vehicle speed signal
(*1) (*4)
X
X
X
X
X
Closed throttle position signal
(*4)
(*2) X
(*2) X
X
(*2) X
(*5) X
Wide open throttle position signal
(*4)
(*2) X
(*2) X
(*2) X
(*5) X
Input speed sensor 1
X
X
X
X
X
Input speed sensor 2
(for 4th speed only)
X
X
X
X
X
Engine speed signals
(*4)
X
X
Transmission range switch
X
X
X
X
X
X
X
Stop lamp switch signal
(*4)
X
X
X
(*5) X
A/T fluid temperature sensors 1, 2 (*6)
X
X
X
X
X
X
X
ASCD
Operation signal
(*4)
X
X
X
X
Overdrive cancel sig-
nal
(*4)
X
X
X
TCM power supply voltage signal
X
X
X
X
X
X
Output
Direct clutch solenoid
X
X
X
X
Input clutch solenoid
X
X
X
X
High and low reverse clutch solenoid
X
X
X
X
Front brake solenoid
X
X
X
X
Low coast brake solenoid (ATF pressure
switch 2)
X
X
X
X
X
Line pressure solenoid
X
X
X
X
X
X
X
TCC solenoid
X
X
X
Starter relay
X
X
A/T CONTROL SYSTEM
TM-23
< FUNCTION DIAGNOSIS >
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
• This line pressure solenoid controls the pressure regulator valve as the signal pressure and adjusts the pres-
sure of the operating oil discharged from the oil pump to the line pressure most appropriate to the driving
state.
LINE PRESSURE CONTROL IS BASED ON THE TCM LINE PRESSURE CHARACTERISTIC PAT-
TERN
• The TCM has stored in memory a number of patterns for the optimum line pressure characteristic for the
driving state.
• In order to obtain the most appropriate line pressure characteristic to meet the current driving state, the TCM
controls the line pressure solenoid current value and thus controls the line pressure.
Normal Control
Each clutch is adjusted to the necessary pressure to match the
engine drive force.
Back-up Control (Engine Brake)
When the select operation is performed during driving and the trans-
mission is shifted down, the line pressure is set according to the
vehicle speed.
During Shift Change
PCIA0007E
PCIA0008E
PCIA0009E
TM-24
< FUNCTION DIAGNOSIS >
A/T CONTROL SYSTEM
The necessary and adequate line pressure for shift change is set.
For this reason, line pressure pattern setting corresponds to input
torque and gearshift selection. Also, line pressure characteristic is
set according to engine speed, during engine brake operation.
At Low Fluid Temperature
When the A/T fluid temperature drops below the prescribed tempera-
ture, in order to speed up the action of each friction element, the line
pressure is set higher than the normal line pressure characteristic.
Shift Control
INFOID:0000000005148514
The clutch pressure control solenoid is controlled by the signals from the switches and sensors. Thus, the
clutch pressure is adjusted to be appropriate to the engine load state and vehicle driving state. It becomes
possible to finely control the clutch hydraulic pressure with high precision and a smoother shift change charac-
teristic is attained.
SHIFT CHANGE
The clutch is controlled with the optimum timing and oil pressure by the engine speed, engine torque informa-
tion, etc.
Shift Change System Diagram
PCIA0010E
PCIA0011E
PCIA0012E
A/T CONTROL SYSTEM
TM-25
< FUNCTION DIAGNOSIS >
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
*1: Full phase real-time feedback control monitors movement of gear ratio at gear change, and controls oil
pressure at real-time to achieve the best gear ratio.
Lock-up Control
INFOID:0000000005148515
The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase power transmission efficiency.
The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid valve,
which is controlled by a signal from TCM, and the torque converter clutch control valve engages or releases
the torque converter clutch piston.
Lock-up Operation Condition Table
TORQUE CONVERTER CLUTCH CONTROL VALVE CONTROL
Lock-up Control System Diagram
Lock-up Released
• In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the
torque converter clutch solenoid and the lock-up apply pressure is drained.
In this way, the torque converter clutch piston is not coupled.
Lock-up Applied
• In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the
torque converter clutch solenoid and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.
SMOOTH LOCK-UP CONTROL
PCIA0013E
Select lever
D position
4 position
3 position
2 position
Gear position
5
4
4
3
2
Lock-up
×
–
×
×
×
Slip lock-up
×
×
–
–
–
PCIA0014E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст