Active Stabilizer Suspension System

SUSPENSION CONTROL: ACTIVE STABILIZER SUSPENSION SYSTEM: SYSTEM DESCRIPTION

SYSTEM DESCRIPTION

1. SYSTEM DESCRIPTION

- The active stabilizer suspension system receives vehicle speed, steering angle, steering direction and other information. Based on this information, the system operates the actuator (motor) installed to the center of the front and rear stabilizers. When the vehicle is turning, the system controls the twist angle of the stabilizer bar to decrease the sideways tilt of the vehicle and improve driving stability.
- The stabilizer bar operation is calculated based on signals from the actuator's magnetic pole sensor, steering sensor, yaw rate sensor, skid control ECU and steering control ECU.
- The operation of the active stabilizer suspension system is stopped when the vehicle speed is 15 km/h (9 mph) or less, the vehicle is being driven in reverse, or a system malfunction is detected. When the system is malfunctioning, the actuator's motor short relay short-circuits the motor. This causes the actuator to fix in place so that the stabilizer operates as a conventional stabilizer bar. At this time, "Check Active Stabilizer Suspension System" is displayed by the combination meter's multi-information display, and a DTC is stored.

2. FUNCTION OF COMPONENTS

- The active stabilizer suspension system consists of the following parts: 1) the front active stabilizer control actuator and rear active stabilizer control actuator, which twist the front stabilizer bar and rear stabilizer bar; 2) the front active stabilizer control ECU and rear active stabilizer control ECU, which operate and control the actuators; and 3) the power steering converter, which steps down the hybrid battery's high voltage to 46 V, and supplies power to the actuators through both ECUs. The power steering converter is also used by the power steering system.
- Immediately after the power switch is turned ON (READY), the front active stabilizer control ECU and rear active stabilizer control ECU perform an initial check. During the initial check, the ECUs check the condition of the power steering converter and active stabilizer control actuators. The initial check has completed normally if the Active Test can be performed normally.