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What is KDSS in cars?

1 Answers

Mildred

07/29/25 1:43pm

KDSS is the abbreviation for Kinetic-Dynamic-Suspension-System, which translates to Dynamic Suspension System in Chinese. The KDSS mainly consists of an electronically controlled power-adjustable suspension system. KDSS features front and rear stabilizer bars, each equipped with independent hydraulic cylinders that control vertical movement, connected by a hydraulic system. Each stabilizer bar's hydraulic cylinder is divided into upper and lower chambers. The front upper and lower hydraulics are connected to the rear upper and lower hydraulics via respective hydraulic lines. Each hydraulic line contains an accumulator. KDSS controls a set of valves connected to the accumulators in the hydraulic lines to maintain each stabilizer bar in optimal condition. KDSS mode selection: Normal Mode: When the vehicle is in a turning state, the outer suspensions of both front and rear wheels are compressed, while the inner suspensions are extended. This causes the stabilizer bars to twist, resisting body roll. The two hydraulic lines between the connected hydraulic pumps have no fluid flow, functioning like a conventional suspension but effectively enhancing anti-roll capability. Off-road Mode: When any one of the four wheels encounters an obstacle and is lifted, the suspension of the lifted wheel is compressed, and the stabilizer bar rises along with the hydraulic pump. Fluid flows between the front and rear hydraulic pumps through the two lines, absorbing the twist of the stabilizer bar. Since the stabilizer bar does not twist, the suspension travel is greater than that of a conventional suspension and can be adjusted according to different road conditions. It can automatically deactivate the stabilizer bar's function based on road conditions. KDSS working principle: It uses two hydraulic cylinders to control a fixed point (left fixed point) on the front and rear suspension stabilizer bars. Under normal driving conditions, this fixed point is locked, and the stabilizer bars function normally, performing anti-roll duties during turns. In off-road conditions, as the suspension is continuously compressed and extended, this fixed point is released, moving with the hydraulic cylinders. The rotational constraint of the stabilizer bar along the X-axis (vehicle length direction) is also released, allowing rotation around the right fixed point as the center, rendering it ineffective. This does not affect wheel grounding, allowing significant height differences between the left and right wheels. Off-road tire grounding performance is improved, enhancing the vehicle's off-road capability.

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