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Delphi is well known around the world for providing a wide range of vehicle innovations. As a manufacturer of components, modules, and systems for each segment of the vehicle, Delphi specializes in tailoring products to support each customer’s specific requirements. For example, with expertise in the areas of suspension, brakes, and steering, Delphi can simply provide a suspension system or integrate ride dynamics technologies to create a complete chassis system. Numerous technical centers and manufacturing sites located from North America to China help Delphi provide personalized customer service and timely delivery of products.

Description

The Delphi cylinder deactivation powertrain mount is an adaptive hydraulic mount that helps provide improved vibration isolation during engine idle and cylinder deactivation events. The mount creates a dynamic stiffness reduction (rate dip) at frequencies related to engine idle and cylinder deactivation conditions, without sacrificing isolation or performance at higher frequency operation. The dynamic properties of this adaptive mount change directly according to engine rpm. The electronic controls and actuation of this controllable mount are completely integrated into the mount itself, requiring only power, ground, and an engine rpm signal.

Benefits

• Enables cylinder deactivation at idle, which results in an additional 1 percent to 3 percent increase in fuel efficiency
• Improved isolation during critical forcing events
• Requires only three electrical connections to the mount—power, ground, and engine rpm signal
• Utilizes a low-power-consumption actuator
• Minimal impact on packaging
• Wide frequency range of dynamic rate dip tuning
  

Typical Applications

The cylinder deactivation powertrain mount is applicable where additional powertrain isolation is desired, and is particularly intended for a vehicle that has large powertrain forcing functions, such as cylinder deactivation gas engine and diesel engine applications. The cylinder deactivation powertrain mount can provide the additional isolation required to enable cylinder deactivation vehicles to idle in the reduced cylinder mode, which helps result in further fuel economy.

Performance Advantages

The major functions of an engine mount are to provide isolation of the passenger from the powertrain and also to help control the motion of the powertrain. By reducing the mount’s stiffness, the isolation function is improved but at the expense of powertrain control. The cylinder deactivation engine mount meets both fundamental requirements by reducing the mount stiffness at only the disturbance frequency of the powertrain, while at the powertrain rigid body mode frequencies, the stiffness and damping of the cylinder deactivation powertrain mount are similar to a conventional hydraulic powertrain mount.

The cylinder deactivation powertrain mount uses the principle of fluid inertia to generate a dynamic rate dip that results in a decrease in stiffness of the mount at the desired frequency. The stiffness of the mount can be reduced without large, costly high-powered actuators. The mount simply generates the stiffness reduction through the natural flow of fluid in the mount, which results in a minimal impact on the package size, cost, and power requirements of the mount.