Ride & Drive Background

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29 Οκτ 2013 (πριν από 4 χρόνια και 7 μήνες)

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Suspension Technologies

Continuously Controlled Electronic Suspension System (CES)

CES is a semi
active suspension system that provides optimum driving safety and
improves ride smoothness and NVH (noise, vibration and harshness), achieving the
balance between ride comfort and handling.

The system changes the feel of a vehicle’s ride by continuously adjusting the shock
absorber damping levels to road conditions and vehicle dynamics like speed, turning,
cornering and driver inputs. The system wa
s developed by Tenneco in conjunction with
Öhlins Racing.

Quick response time and wide force range make it possible to use advanced control
strategies. In the systems on the market today, each shock is individually controlled by a
dedicated central contro
ller, which uses information from both its own set of sensors as
well as from engine management, ABS, ESP, and the CAN

The first generation of the CES went into production in 2003 as standard equipment on
the Volvo R
line and as an option on the S80,

V70 and S60. Today, CES shocks are
available on Audi Q3; Ford S
Max, Galaxy, and Mondeo; Mercedes
Benz C
Class, AMG E
Class, SLK and CLS; BMW X3; Volkswagen Golf, Golf GTI, Scirocco,
Passat, Passat CC, Eos, Tiguan, Touran and Sharan; and Volvo V
70, S80, XC70, XC60,
S60 and V60.

New Digital Ride Control Valve Technology (DRiV™)

DRiV™ is an affordable adjustable damper technology destined for the B/C vehicle
segment. Internal valve technology results in lower power usage while offering fast

damping adjustments. DRiV™ offers a low system cost as no dedicated ECU is

New Dual Mode Damper Technology

Dual mode damper technology is aimed at the small and midsized vehicle segments. The
driver can select from two damper settings via a but
ton on the dashboard, giving either
comfort or sport ride functionality.


Building on the success of CES technology, Tenneco has developed a system that
integrates the
® H2 system with CES technology, called the
® H2/CES.
is system combines advanced mechanical and hydraulic systems with intelligent
electronics, leading to a new suspension concept that improves vehicle dynamics.
Compared with other anti
roll systems available on the market today, this system has
advantages f
or performance, power consumption, weight, packaging and cost.



The front and rear anti
roll bars and four shock absorbers have been replaced with four
acting hydraulic cylinders with integrated CES damper valves, two roll
accumulators, an automatic

pressure maintenance unit (APMU), a comfort valves and
interconnected hydraulic lines. Two CES damper valves at each corner restrict the flow
between cylinders and accumulators to electronically control roll, bounce and pitch
modes, allowing decoupling of

transient ride and handling performance.

This interconnected passive
reactive system provides continuously controlled damping
and high roll stiffness with reduced warp and articulation stiffness. Vertical tire loads are
more equalized, resulting in sign
ificantly improved road traction and performance. The
continuously controlled damping works with the skyhook principle for body control with
added algorithms for wheel hop control, steering, braking and acceleration. Use of the
electronically controlled CE
S damper valves in combination with intelligent control
algorithms, allows independent control of body and wheel motions.

Active Suspension Car (ACOCAR


The ACOCAR™ fully
active system include, just like in the Kinetic H2/CES system,
shock absorbers with

two continuous variable CES valves each but also features the
addition of hydraulic pumps to bring energy to the suspension. This results in even more
control on effective damping and spring forces.

Oil is constantly circulated, via the pumps, through t
he shock absorbers whose damping
valves can each be closed independently to make the car body move up when it would
otherwise be moving down, and vice versa. The system works to keep the car body flat at
all times while controlling wheel movements in order

to improve tire to road contact.
The addition of a pump at each corner means the system does not depend on the
movement of the wheels alone to generate damping force. Meanwhile, the pump flows
are continuously adapted to the vehicle needs to reduce power

consumption to levels
lower than the use of headlamps.

The result is that the ACOCAR™ system controls roll, pitch and heave better than any
other suspension system on the market, resulting in superior benefits in terms of
handling, safety and comfort.

Frequency Selective Damping Technology (FSD)

This technology provides an enhanced ride experience at minimal system cost for the
small and midsized vehicle segment. The driver can enjoy enhanced comfort and
improved tyre grip at high frequencies and a good

car body control at low frequencies.

The Frequency Selective Damping Technology provides two frequency dependent
rebound characteristics. The compression high and low frequency characteristic are
identical. Typically the high frequency characteristic pr
ovides a higher level of comfort
than a passive damper. On the other hand, the driver will have enough body control
because the dampers generate the same compression characteristics at all frequencies and
a higher rebound characteristic at low frequencies
. This is achieved via a by


technology over the piston valving. This bypass valve is NC (Normally closed) and offers
firm rebound damping at low frequencies; soft damping is achieved at higher frequencies.