Driveline: Overview Nissan Rogue I

DESCRIPTION

1. AWD controls distribution of drive power between front-wheel drive (100:0) and 4-wheel drive (50:50) conditions according to signals from sensors.
2. By receiving the steering angle sensor signal and G sensor signal, vehicle with VDC corrects a torque distribution for front and rear wheels according to a driving operation and a behavior of the vehicle during cornering and improves driveability and safety on a slippery road surface.
3. It transmits/receives each signal from the following AWD control unit via CAN communication line (without VDC). COMPONENTS FUNCTION CHART Component parts Function ABS actuator and electric unit (control unit) Transmits the following signals via CAN communication to AWD control unit. Vehicle speed signal Stop lamp switch signal (brake signal) ECM Transmits the following signals via CAN communication to AWD control unit. Accelerator pedal position signal Engine speed signal Combination meter Transmits conditions of parking brake switch signal via CAN communication for AWD control unit. Receives the following signals via CAN communication to AWD control unit. AWD warning lamp signal Mode lamp signal
4. It transmits/receives each signal from the following ABS actuator and electric unit (control unit) control unit via CAN communication line (with VDC). COMPONENTS FUNCTION CHART Component parts Function ECM Transmits the following signals via CAN communication to ABS actuator and electric unit (control unit). Accelerator pedal position signal Engine speed signal Combination meter Transmits conditions of parking brake switch signal via CAN communication for ABS actuator and electric unit (control unit). Receives the following signals via CAN communication to ABS actuator and electric unit (control unit). AWD warning lamp signal Mode lamp signal
5. It transmits/receives each signal from the following AWD control unit via AWD communication line (with VDC). COMPONENTS FUNCTION CHART Component parts Function ABS actuator and electric unit (control unit) Transmits conditions of AWD solenoid signal via AWD communication for AWD control unit. Receives the following signals via AWD communication from AWD control unit. AWD lock switch signal AWD solenoid monitor signal

AUTO Mode

1. Electronic control allows optimal distribution of torque to front/rear wheels to match road conditions.
2. AWD mode makes possible stable driving possible with no wheel spin, on snowy roads or other slippery surfaces.
3. On roads which do not require 4-wheel drive, AUTO mode contributes to improved fuel economy by driving in conditions close to front-wheel drive.
4. Sensor inputs determine the vehicle's turning condition, and tight cornering/braking are controlled by distributing optimum torque to rear wheels.

LOCK Mode

1. Front/rear wheel torque distribution is fixed, ensuring stable driving when climbing slopes.
2. Vehicle will switch automatically to AUTO mode if vehicle speed increases. Vehicle automatically returns to direct 4-wheel driving conditions if vehicle speed decreases.

Note. If there is a significant difference in pressure or wear between tires, full vehicle performance is not available. LOCK mode may be prohibited, or speeds at which LOCK mode is enabled may be restricted according to the tire conditions.

Scheme 8

OPERATION PRINCIPLE

Electric Controlled Coupling

Scheme 9

Scheme 10

1. The AWD control unit supplies command current to electric controlled coupling (AWD solenoid).
2. The control clutch is engaged by electromagnet and torque is detected in control clutch.
3. The cam operates in response to control clutch torque and applies pressure to main clutch.
4. The main clutch transmits torque to front wheels according to pressing power. Transmission torque to the rear wheels is determined according to command current.

Scheme 11

Component Description

COMPONENTS FUNCTION CHART

1. Controls driving force distribution by signals from each sensor from front wheel driving mode (100:0) to 4- wheel driving mode (50:50) (without VDC).
2. Controls driving force distribution by signals from ABS actuator and electric unit (control unit) from front-wheel driving mode (100:0) to 4-wheel driving mode (50:50) (with VDC).
3. Front wheel driving conditions is available by fail-safe function if malfunction is detected in AWD system.

1. Transmits the following signals via CAN communication to AWD control unit (without VDC). Vehicle speed signal Stop lamp switch signal (brake signal)
2. Transmits AWD solenoid signal via AWD communication to AWD control unit (with VDC).

Controls electric controlled coupling by command current from AWD control unit.

AWD solenoid is supplied with voltage by the internal circuit of AWD control unit.

Transmits the following signals via CAN communication to AWD control unit (without VDC) or ABS actuator and electric unit (control unit) (with VDC).

1. Accelerator pedal position signal
2. Engine speed signal

1. AWD communication transmits and receives signals between control units (ABS control unit to AWD control unit) connected with a dedicated line (single line).
2. Transmits conditions of AWD solenoid signal via AWD communication for AWD control unit.
3. Receives the following signals via AWD communication from AWD control unit. AWD lock switch signal AWD solenoid monitor signal

1. AWD communication transmits and receives signals between control units (ABS control unit to AWD control unit) connected with a dedicated line (single line).
2. Transmits conditions of AWD solenoid signal via AWD communication for AWD control unit.
3. Receives the following signals via AWD communication from AWD control unit. AWD lock switch signal AWD solenoid monitor signal

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. Refer to " CAN COMMUNICATION SIGNAL CHART ".

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. Refer to " CAN COMMUNICATION SIGNAL CHART ".

Supplies power to AWD control unit.

Note. AWD system of vehicle with VDC shares various controls with ABS actuator and electric unit (control unit). Therefore, checking power supply and ground earth circuit is required.

Able to select AUTO or LOCK mode.

1. Turns ON when there is a malfunction in AWD system. AWD warning lamp indicates the vehicle is in fail-safe mode and shifting to front-wheel drive or 4-wheel drive (rear-wheels still have some driving torque).
2. Also turns ON when ignition switch is turned ON, for the purpose of lamp check. Turns OFF after the engine starts if system is normal.

The following is the indications of indicator lamp after engine start.

AWD warning lamp does not turn ON when the ignition switch is turned to ON.

AWD warning lamp does not turn OFF several seconds after engine started.

Heavy tight-corner braking symptom occurs when the vehicle is driven and the steering wheel is turned fully to either side after the engine is started.

Note. Light tight-corner braking symptom may occur depending on driving conditions. This is not malfunction.

Vehicle does not enter 4-wheel drive mode even though AWD warning lamp turned to OFF.

While driving, AWD warning lamp blinks 2 times in 1 second and it turns OFF after 1 minute.

1. This symptom protects drivetrain parts when a heavy load is applied to the electric controlled coupling and multiple disc clutch temperature increases. Also, optional distribution of torque sometimes becomes rigid before lamp blinks quickly. Both cases are not malfunction.
2. When this symptom occurs, stop vehicle and allow it to idle for some times. Blinking will stop and system will be restored.

AWD warning lamp blinks at approximately 2 seconds intervals while driving.

While driving, AWD warning lamp blinks 2 times in 1 second and it turns OFF after 1 minute.

1. This symptom protects drivetrain parts when a heavy load is applied to the electric controlled coupling and multiple disc clutch temperature increases. Also, optional distribution of torque sometimes becomes rigid before lamp blinks quickly. Both cases are not malfunction.
2. When this symptom occurs, stop vehicle and allow it to idle for some times. Blinking will stop and system will be restored.