A hydraulic adjustable suspension is a system that uses hydraulic changes to regulate the vehicle's suspension:
Its core component is a built-in electro-hydraulic integrated module that can adjust the damping frequency and extent of the shock absorbers based on vehicle speed. Additionally, longitudinal and lateral acceleration yaw gyro sensors installed near the vehicle's center of gravity collect signals such as body vibration, wheel bounce, and tilt status. These signals are processed by the vehicle's onboard computer, which then transmits corresponding execution signals to four hydraulic cylinders to increase or decrease hydraulic fluid, thereby altering ground clearance and other parameters.
Hydraulic adjustable suspension features a height-adjustable chassis and utilizes hydraulic fluid for improved durability, though the technology is relatively older and reaction speed is slower. The operating principle of a hydraulic adjustable suspension system is similar to that of an air suspension, allowing for chassis height adjustment or automatic leveling. For example, taking the hydraulic suspension on older Citroën C5 models, the vehicle height automatically lowers when parked and returns to its normal height after starting the engine.
When the vehicle is in motion, on urban roads and at speeds below 110 km/h, the standard height is maintained. When the speed exceeds 110 km/h, the electro-hydraulic integrated module controls the front of the vehicle to lower by 15 mm and the rear by 11 mm to improve driving stability, reduce the maximum frontal area against wind, decrease sensitivity to crosswinds, and simultaneously lower fuel consumption. When the speed drops below 90 km/h, the vehicle returns to its standard height. In poor road conditions, the electro-hydraulic integrated module controls the vehicle to raise, maximizing suspension travel and comfort.
