Suspension Control System: Overview Infiniti FX50 II

Scheme 1

Description

1. The Continuous Damping Control system mainly consists of the components such as the E-SUS control unit, front body vertical G sensor, front wheel vertical G sensor, rear body vertical G sensor, and shock absorber actuators on each wheel.
2. It calculates the command values to be transmitted to the shock absorber actuator on each wheel based on the information from ECM, ABS actuator and electric unit (control unit) and steering angle sensor via CAN communication and information from the front body vertical G sensor, front wheel vertical G sensor and rear body vertical G sensor.
3. The shock absorber actuator on each wheel controls the damping force based on the command values calculated by E-SUS control unit.
4. Can perform the self-diagnosis with CONSULT-III.
5. Communicates the signal from each control unit via CAN communication.

CONTROL UNIT SIGNAL STATUS

Scheme 2

Controls damping force by changing the oil passage cross section area through control of orifice by solenoid core activation.

Scheme 3

1. Changes the damping force control by switching the switch (AUTO mode or SPORT mode).
2. Changes the damping force depending on the output current to the shock absorber actuators.

Scheme 4

Scheme 5

Component Description

COMPONENT DESCRIPTION

ECU IDENTIFICATION

E-SUS control unit part number can be read.

The vehicle speed signal is transmitted from the ABS actuator and electric unit (control unit) to E-SUS control unit via CAN communication.

The steering angle signal is transmitted from the steering angle sensor to E-SUS control unit via CAN communication.

The required torque signal is transmitted from ECM to E-SUS control unit via CAN communication.

The stop lamp switch signal is transmitted from the ABS actuator and electric unit (control unit) to E-SUS control unit via CAN communication.

The brake pressure control signal is transmitted from the ABS actuator and electric unit (control unit) to E-SUS control unit via CAN communication.

Detects the vertical G applied at vehicle front, and outputs it to E-SUS control unit in analog voltage.

Detects the vertical G applied at vehicle front, and outputs it to E-SUS control unit in analog voltage.

Detects the vertical G applied at vehicle front, and outputs it to E-SUS control unit in analog voltage.

Detects the vertical G applied at vehicle front, and outputs it to E-SUS control unit in analog voltage.

Detects the vertical G applied at vehicle rear, and outputs it to E-SUS control unit in analog voltage.

Integrated into each the shock absorbers on wheels and opens or closes the orifice by moving the solenoid core vertically with the control current from E-SUS control unit to regulate the damping force.

Integrated into each the shock absorbers on wheels and opens or closes the orifice by moving the solenoid core vertically with the control current from E-SUS control unit to regulate the damping force.

Integrated into each the shock absorbers on wheels and opens or closes the orifice by moving the solenoid core vertically with the control current from E-SUS control unit to regulate the damping force.

Integrated into each the shock absorbers on wheels and opens or closes the orifice by moving the solenoid core vertically with the control current from E-SUS control unit to regulate the damping force.

1. Controls the shock absorber actuators on 4 wheels according to the signals from each sensors.
2. Stops the control signal to the shock absorber, when detecting any malfunction in the electrical system. The damping force is maintained at approximately the intermediate level between the maximum and the minimum values.

Power supply for E-SUS control unit.

Performs good/no good judgment of the E-SUS control unit reprogramming.

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 detect 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 communication with less wiring. Each control unit communicates data but selectively reads required data only.

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 detect 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 communication with less wiring. Each control unit communicates data but selectively reads required data only.

1. Mode select switch (E-SUS mode select) can be switched to SPORT mode or AUTO mode manually.
2. When the ignition switch is turned to ON, the mode lamp briefly illuminates, but it is not a malfunction.

SELECTION MODE REFERENCE

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

Sport mode indicator lamp does not turns ON when mode select switch (E-SUS mode select) is operated to SPORT mode.

See also:
• CAN SYSTEM SPECIFICATION TABLE