System Description

System Diagram (Part 1):

System Diagram (Part 2):

SYSTEM DESCRIPTION

1. DESCRIPTION
a. The active stabilizer control system responds to the side acceleration of the vehicle while the vehicle is turning by performing the following: 1) controlling the torque output from the actuator, and 2) optimizing the control of the roll rigidity distribution of the stabilizer bar.

2. FUNCTIONS OF COMPONENTS
a. Active stabilizer control ECU:
- An active stabilizer control ECU is installed in the front and rear of the vehicle. The front ECU activates the front active stabilizer control actuator, and the rear ECU activates the rear actuator.
- The front and rear active stabilizer control ECUs calculate the necessary control based on signals from the steering sensor, wheel speed sensor, and side acceleration. Then, they calculate the output torque for the front and rear active stabilizer control actuators. Furthermore, based on signals from each sensor, they calculate the twist angle of the front and rear stabilizer bars necessary to produce the torque, and drive the active stabilizer control actuators.
- The active stabilizer control ECUs operate in conjunction with the adaptive variable suspension system. When sport mode is selected using the absorber control switch, the active stabilizer control ECU operates to reduce roll and further increase steering responsiveness.

b. Active stabilizer control actuator:
Stabilizer bars are attached to the front and rear active stabilizer control actuators. The actuators rotate the stabilizer bars coaxially based on signals from the front and rear active stabilizer control ECU.

c. DC/DC converter:
The DC/DC converter recharges the active stabilizer battery and supplies power to the front and rear active stabilizer control ECU.

d. Active stabilizer battery:
- A lead battery supplies the power for the active stabilizer control ECU.
- The battery is equipped with a combined temperature sensor and current sensor for battery capacity management.

e. Battery current sensor:
- The battery current sensor is installed on the battery negative (-) terminal. It detects the charge and current capacity and sends a signal to the rear active stabilizer control ECU. Based on this signal, the rear active stabilizer control ECU calculates the battery capacity. According to the battery charge and current capacity, the amount of change in magnetic density generated at the core is converted to voltage, and then the voltage is output.
- If the temperature of the battery electrolyte is too high or low, it could increase the speed of deterioration of the battery or fully deplete the battery. Also, according to the battery electrolyte temperature, the characteristics of electric current being received change. To protect the battery, the battery liquid temperature is detected and a signal is sent to the rear active stabilizer control ECU.

3. FAIL-SAFE FUNCTION
If a system malfunction is detected, the ECU performs the following: 1) active stabilizer control actuator's DC brushless motor terminals are short circuited; 2) brake force is created; and 3) by simulating a direct connection to the stabilizer bar, it ensures that the stabilizer bars function as they did before the malfunction. At the same time, the system malfunction is indicated to the driver on the multi-information display and the master warning light is illuminated.