The future of ride control

April 15, 2016
Tenneco's Monroe is on the leading edge of highly advanced electronic ride control and suspension technologies used in many current vehicle applications and poised for widespread adoption in future platforms.

Tenneco’s Monroe Shocks and Struts brand is celebrating its 100th Anniversary. Monroe was established in 1916 in Monroe, Mich., and initially focused on the development and production of tire pumps - a much-needed tool in an era of unpaved roads and comparatively few repair shops.

Tenneco's CVSA2/Kinetic suspension system — one of several OE-focused technologies within the Monroe Intelligent Suspension portfolio.

But the brand’s future — and in many respects the future of automotive suspension technology — was transformed in 1926 with the invention of the Monroe Shock Eliminator. From there, Tenneco and the Monroe brand have achieved recognition as one of the world’s largest manufacturers of suspension components. Today, Tenneco operates 15 world-class engineering centers across five continents and serves more than 25 original equipment manufacturers, including Ford, General Motors, Fiat Chrysler, Honda, Toyota, Volkswagen, BMW and Volvo.

Tenneco's CVSAe technology, also part of the Monroe Intelligent Suspension portfolio, is a continuously variable, semi-active suspension system that senses road and driving conditions to adjust the corresponding triple-tube, electronic dampers in real time. The system's ECU can change rebound damping every 10 milliseconds.

A recent independent consumer clinic surveyed a group of 155 drivers from different vehicle segments that included compact class, upper mid-range vehicles and SUVs to assess the overall driving experience with passive and semi-active suspension systems. More than 94 percent of SUV drivers rated the overall driving experience of those vehicles equipped with semi-active suspension systems as “very good” or “excellent.” Similarly, in the compact car segment, 86 percent of all drivers rated their overall driving experience as “very good” or “excellent,” as did 88 percent of drivers of upper-middle class vehicles. It is clear from these studies that customers want comfort, control, flexibility and safety designed into the automobiles they intend to purchase in the near future.

In on-road testing, also performed by an independent testing institute, drivers rated intelligent suspension systems highly in reaction to improved stability during lane changes, strongly reduced body-roll oscillations during obstacle avoidance maneuvers and improved wheel-to-road contact on wet and broken road surfaces. In fact, during double lane-change tests utilizing a compact car, steering angle correction was reduced 15 percent and side-slip angle was reduced 37 percent. The reduction in body movement was found to bring greater stability, which helps increase comfort and the feeling of safety.

Tenneco’s Monroe Intelligent Suspension platform provides technologies customers can experience, feel and recognize. As these OE-based technologies eventually make their way into your service bay, you will have the opportunity to restore the “like-new” driving experience preferred by so many consumers.

“We will provide the comprehensive technical training and support - combined with quality Monroe replacement components - needed to address these service opportunities,” says Jeff Koviak, vice president and general manager, North America Aftermarket, Tenneco. “That’s the advantage of working with a manufacturer that is a leader both in the OE and replacement markets.”

Monroe Intelligent Suspension systemsDual-mode selective damping Dual Mode Damper technology provides an enhanced experience in sporty compact cars. A button on the dashboard allows drivers to choose how their suspension will interact with the driving environment. Four electronically controlled rebound dampers connect to a simple control unit, which switches the dampers to toggle between soft and firm rebound settings. The system also provides drivers with the option to switch from a default comfortable ride setting for daily traffic, and a more aggressive, track-like performance setting.DRiV™ This system for compact and medium car segments uses an ECU located in each shock to control rebound damping based on forward and lateral acceleration. The DRiV system offers 75 percent of the performance, at 50 percent of the cost, of semi-active suspension systems.CVSA The Continuously Variable Semi-Active Suspension (CVSA) system continuously adjusts damping levels according to road conditions and vehicle dynamics without the need to compromise comfort, performance or safety. Tenneco’s first CVSA technology used an external valve to control damping. However, subsequent development of newer CVSA technology relocated the valve inside the damper. In addition, for even higher levels of performance and comfort, two-valve CVSA technology is available, with independent electro-hydraulic valves controlling both rebound and compression damping, providing increased suspension tuning range and a higher level of comfort, performance and safety in changing and demanding road conditions.
CVSAe CVSAe has proven itself a commanding product for 10 years with steady performance on 39 different vehicle models. With an evolved damper and hydraulic valve design, CVSAe is leading the automotive marketplace in suspension technology. This continuously variable, semi-active suspension system senses road and driving conditions to adjust dampers in each shock absorber in real time for a more comfortable and controlled driving experience. Each shock is connected to a central ECU that reads sensor inputs monitoring wheel assembly acceleration, body displacement and steering angle. The ECU can change rebound damping settings every 10 milliseconds to deliver optimal ride comfort and vehicle control. The dampers are based on a triple-tube design and use one externally mounted active hydraulic valve to control damping.  
CVSA2 The innovative and cutting-edge CVSA2 is the most recent semi-active damper technology from Tenneco. This lightweight system features two independent, externally mounted electro-hydraulic valves that control rebound and compression damping independently and provide increased tuning range to achieve more advanced levels of comfort and control. This semi-active suspension system uses four electronically controlled shocks connected to a central ECU. Each shock has two electronic servo valves to control damping. The two-valve CVSA2 actuator is designed around a lightweight aluminum monotube damper that reduces weight and, unlike twin-tube designs, allows the unit to be mounted upside down when necessary.
CVSA2/Kinetic The refined CVSA2/Kinetic suspension system delivers the highest levels of vehicle occupant comfort in combination with superb vehicle handling performance. This technology provides excellent body roll control, traction and wheel grip, making it ideal for sports cars, premium passenger cars and off-road SUVs alike. This sensitive suspension system effectively replaces the functionality of both front and rear mechanical anti-roll bars. The sophisticated roll-control system connects all of the CVSA2 dampers via hydraulic lines. Thus, body roll stiffness is continuously progressive and can be fine-tuned and with an APMU installed, adjusted by drivers as desired for optimal performance and vehicle handling.
ACOCAR ACOCAR is Tenneco’s premier fully active Intelligent Suspension system. It represents an expansion of the responsive CVSA2 Kinetic concept, with the additional engineered component of active power packs installed on each corner of a vehicle to provide the ultimate driving experience. ACOCAR is a fully active suspension that features active control of wheel assemblies and body motion to deliver superlative ride comfort, control and safety. With an almost magic “flying carpet”-style control of wheel and body motions, a vehicle’s body can be fully maintained in a flat plain orientation that improves tire-to-road contact, even on bumpy roads and traveling through corners while still providing superior handling, safety and comfort     

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