When introduced, the Volvo S60 AWD has an electronically controlled AWD feature. S60 is predicted to be the sportiest and most dynamic sedan of the Swedish manufacturer.
The Active-On-Demand system has been developed in collaboration with Swedish company Haldex. In this new system, power is distributed between the front and rear wheels through a wet multi-plate clutch.
It has a unique design divided into three parts: hydraulic, mechanical and electronic systems. Each unit can be considered a hydraulic pump, where when the speed difference between the front and rear wheels occurs, the hydraulic pump produces oil pressure which forces two sets of wet coupling plates to close. When the two axles rotate at the same speed, the pressure decreases so that the drive wheel is balanced.
This system is electronically controlled through modules installed in the rear differential. This forms part of the unit with a stepper motor and control valve. The differential electronic module is communicated with the Engine Control Module (ECM) and brake control module via the Control Area Network (CAN). The differential electronic module uses a sensor signal to control the oil pressure on the wet clutch plate by adjusting the control valve.
The oil pressure on the wet clutch plate determines the torque that can be transferred to the rear wheel of the house and the ring-shaped piston is connected to one axle while the piston control unit is connected to the other axle. When both axes rotate at the same speed, pumping does not occur. As soon as the speed difference appears, pumping and oil flow starts.
The oil is supplied to the clutch piston which compresses the wet clutch package and consequently reduces the speed difference. Oil returns to the reservoir through an adjustable throttle valve, which controls oil pressure, and therefore the pressure on the clutch is wet.
Electronic control means that clutch functionality can be adjusted to a variety of driving situations.
AWD system is smart electronically. He feels what road conditions (through the slip of the road wheels) and what the driver wants. This information provides a basis for whether and how the system will act.
When accelerating on difficult surfaces, such as loose gravel, fast and instant reinforcement occurs. During cornering or low speed parking maneuvers, the system knows that the difference in speed between wheels does not require involvement – and consequently, the inertia experienced by other systems in the same situation is avoided.
The AWD system is connected to the Multiplex vehicle electrical system. As a result, it communicates with other systems in the car to optimize all wheel drive to suit almost all driving situations. This digital communication involves the Traction Control System (TRACS), for example.
Starting in January 2002, the Volvo S60 AWD is also possible to be equipped with DSTC (Dynamic Stability and Traction Control) for better slippage control during adverse weather conditions.
The electronically controlled AWD system is marked first and foremost by very fast release and release times, a further illustration of Volvo Cars’ commitment to driving safety.
“The speed of the system provides what is already a balanced car with excellent road handling. Besides, sedan owners do not use all-wheel drive especially for accessibility but for stable road retention and stability,” said Hans Gustavsson, Senior Vice President of Research, Development & Purchasing at Volvo Car Corporation.
The Volvo S60 AWD is equipped with a 2.4 liter five cylinder engine with a light pressure turbocharger. The output is 197 hp at 5,100 rpm and the maximum torque is 210 lb./ft. at 1,800 low rpm.
This machine is also used in Volvo S60 2.4T. This is a member of the new generation of RN engines, which have undergone extensive modifications to make it cleaner and more fuel efficient.
Turbocharged engine management software that responds quickly means the engine has a lightning response and impressive power at low engine speeds – two very important features in the dynamic characteristics of Volvo S60 AWD.
Gallery of 2002 Volvo S60 All Wheel Drive
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