Suspension: Description and Operation

SUSPENSION CONTROL: KINETIC DYNAMIC SUSPENSION SYSTEM: SYSTEM DESCRIPTION

SYSTEM DESCRIPTION

1. DESCRIPTION
(a) System description
In the KDSS (Kinetic Dynamic Suspension System), a cylinder is installed to each of the front and rear stabilizer bars. The front and rear cylinder upper chambers and the front and rear lower chambers are each connected by a pipe. The hydraulic circuit is filled with high-pressure (3 MPa) suspension fluid. The ECU controls the accumulator solenoid valves according to input signals from each sensor.
The suspension roll stiffness increases and the vertical load fluctuation decreases (off-road drivability increases) through operation of this system.
(b) Operation description
(1) Operation when the vehicle rolls:
When the vehicle rolls, the accumulator solenoid valves close to cause the front and rear hydraulic pressure to be equal (both upper and lower chambers) so that the front and rear pistons do not stroke. By doing this, the stabilizer bars twist as those on vehicles without a KDSS to reduce vehicle body roll.




(2) Operation when driving off-road (when one wheel rises up):
When driving off-road (when one wheel rises up), the accumulator solenoid valves open to cause the front and rear pistons to stroke in opposite directions.
Because of this, the stabilizers do not twist (the effort required of the stabilizers is reduced) and allow the wheel to stroke when a shock is received from the ground.





2. FUNCTION OF COMPONENTS






3. SYSTEM CONTROL

- The stabilizer control ECU controls the opening/closing of the accumulator solenoid valves based on the information from the speed sensors, acceleration sensor, and steering angle sensor.
- The 2 accumulator solenoid valves are opened/closed at the same time.





- Switching from "Close" to "Open" of the solenoid valves occurs when all sensor values deviate for a specified time from the "Close" range shown in the above illustration.

SYSTEM DIAGRAM