Porsche Dynamic Chassis Control
Porsche Dynamic Chassis Control (PDCC)
The active chassis control system PDCC with electronically controlled rear differential lock is available as an option for all Panamera models in combination with adaptive air suspension. It is an active system that is used in conjunction with adaptive air suspension and PASM to optimally stabilize the vehicle. PDCC prevents rolling movements of the body around the vehicle's longitudinal axis by applying a counter-moment using the active antiroll bars on the front and rear axle. The system also improves the vehicle's balance through dynamic rolling moment distribution. It thus enables superb agility at all speeds, optimal steering behavior and balanced load alteration behaviour.
The benefits of the system for the driver are in the following areas:
Improved vehicle performance due to:
- Increased steering precision
- Reduced lateral inclination (vehicle tilt) during cornering
- More agile steering behavior
- Higher maximum lateral acceleration during cornering
- Noticeably more solid vehicle handling
Greater comfort due to:
- Almost total compensation of the roll angle
- Suppression of body movements
- Decoupling of the anti-roll bars when driving straight ahead, resulting in fewer copy effects (countermovement of the body when one side moves)
Porsche Dynamic Chassis Control can also be controlled using the PASM chassis buttons. PASM and PDCC are always configured together by selecting one of the three PASM chassis control programs. In Comfort mode, PDCC ensures a very comfortable ride on uneven road surfaces thanks to the anti-roll characteristics. In Sport mode, the active intervention of the systems affects steering
behaviour, maximum rolling support, self-steering properties and traction in such a way that maximum performance and agility is guaranteed.
PDCC Component Overview
Reservoir
Installation position at front left in the engine compartment, supplies oil for power steering and PDCC, with oil level sensor (float with reed contact), change interval: 60,000 miles (90,000 km) or every 6 years.
Tandem Pump
Vane cell pump for power steering, radial piston pump for PDCC.
Front Axle Valve Block
The valve block comprises two pressure sensors, a failsafe valve, the direction valve and a pressure-regulating valve. The valve block also has an integrated volume flow component, which distributes the volume flow at a fixed division ratio of 60/40 on front and rear axle. The valve block is fitted in the front left wheel housing.
Rear Axle Valve Block
The valve block comprises two pressure sensors, a pressure-regulating valve and the direction valve. The valve block is fitted on the left rear-axle auxiliary support.
Swivel Motor
The core elements of the system are the active anti-roll bars with hydraulic swivel motors, which are integrated on front and rear axle instead of the conventional mechanical anti-roll bars. A vane controller divides the swivel motor into several chambers, which are filled with oil. A torque, which affects the body as well as the wheels via the anti-roll bar halves fitted on both sides of the swivel motor, is built up by specifically activating individual chambers and changing the oil pressure. The system has variable control
over the oil pressure and oil flow in both rolling directions and can thus counteract lateral inclination forces, which can occur while cornering due to lateral acceleration affecting the vehicle. As a result, lateral inclination can be almost entirely compensated even in high lateral acceleration ranges, thereby keeping the vehicle horizontal.
PDCC Control Unit
The control unit is installed at the right-hand side of the luggage compartment. The input data is evaluated continuously and appropriate control operations are initiated in the valve blocks over the vehicle's entire speed range.
Porsche Dynamic Chassis Control (PDCC) with Porsche Torque Vectoring Plus (PTV Plus) - V6
With the optionally available chassis control system Porsche Dynamic Chassis Control (PDCC) with Porsche Torque Vectoring Plus (PTV Plus), all Panamera models offer even more comfortable roadholding combined with increased sportiness.
PDCC is an active roll stabilization system: it detects the vehicle's lateral inclination during cornering and then acts to considerably reduce this effect. It also prevents lateral instability of the vehicle on uneven road surfaces. This is achieved by means of active anti-roll bars on both axles, which selectively build up forces to counteract the lateral inclination of the vehicle depending on the steering angle and lateral acceleration.
The PTV Plus system combined with PDCC is a system designed to enhance driving dynamics and stability. It functions with variable torque distribution at the rear wheels and an electronically regulated rear differential lock. PTV Plus improves the steering behavior and steering precision as a function of the steering angle and steering speed, accelerator pedal position, yaw rate and vehicle speed by means of selective braking interventions at the right-hand or left-hand rear wheel. When driving dynamically into a bend, the inside rear wheel is then braked slightly when the steering is turned. As a result, the rear wheel on the outside of the bend receives a higher drive force and permits additional angular momentum in the steering direction. The result is direct and dynamic steering into the bend. PTV Plus significantly increases agility and steering precision at low and moderate speeds. At high speeds and when accelerating out of bends, the electronically regulated rear differential lock ensures additional stability. It also improves the traction of the rear wheels on different road surfaces as well as on wet and snow-covered roads. This results in a high lateral vehicle stability (quiet body), optimum traction and high agility at all speeds with precise steering response and balanced load alteration behavior.