SNOW MODE SWITCH:
The snow mode switch signal is sent to the “unified meter and A/C amp.” from the snow mode switch. The “unified meter and A/C amp.” then sends the signal to the ECM via the CAN communication line. The snow mode is used for driving or starting the vehicle on snowy roads or slippery areas. If the snow mode is activated, the vehicle speed will not accelerate as quickly as normal to avoid vehicle slip. In other words, ECM controls rapid engine torque change by controlling the electric throttle control actuator operating speed.<!-- google_ad_section_end -->

How It Works

The ATTESA system is designed for smooth starts, better fuel economy and better traction and maneuverability on snowy roads than conventional all-wheel drive systems and minimal compromise of rear-wheel drive performance characteristics on dry roads.
The system's advanced torque split control strategy automatically transfers optimum torque to the wheels according to road and driving conditions. It provides outstanding cornering capability similar to a sports car due to optimum torque distribution to the front and rear wheels (from approximately 0:100 up to 50:50).


System sensors continuously monitor vehicle speed, throttle position and wheel spin (at all four wheels). When road conditions don't require AWD, the G35 acts and feels like the award-winning rear-wheel drive G35 sedan, with the system capable of sending up to 100 percent of the power to the rear wheels. By comparison, leading competitive AWD systems with center differential transfer systems limit the amount of available power at the rear wheels to 50 percent (Audi A4 Quattro), 60 percent (Mercedes C-class 4-matic) or 62 percent (BMW 330xi). The G35 thus offers minimal compromise of rear-wheel drive performance and handling feel.
From a standing start, the ATTESA system adjusts the front-to-rear torque distribution, adding 25 percent to the front wheels for a more powerful start. The system then quickly adjusts torque distribution as needed, sending up to 100 percent to the rear wheels if conditions warrant, or adjusting the front drive percentage up to 50 percent as needed.


In cornering situations, the ATTESA system can detect traction needs throughout the course of a turn and react accordingly. With its millisecond response time, the system can shift toque back and forth between the front and rear wheels to help enhance stability and traction. For example, in entering a corner (under normal driving conditions), the system functions nearly the same as any rear-wheel drive car. Torque distribution is almost 100 percent rear. Once in the corner, the system is able to transfer to the front wheels that portion of the drive torque that the rear wheels can't handle. This results in outstanding, sports car-like cornering ability. When exiting the corner, torque can be quickly transferred according to the wheel spin of the rear wheels from 50:50 up to 0:100 for smooth acceleration out of the turn.


Another unique feature of the G35 AWD system design is the addition of a Snow-Mode function, which reduces throttle sensitivity and fixes initial torque distribution at 50:50, helping avoid wheel spin for smooth starts on snowy roads. At speeds above 12 miles per hour, the Snow-Mode function allows the central computer processing system to take over again, continually monitoring traction conditions and changing the torque distribution as needed.


"Only the all-wheel drive G35 feels like a rear-wheel drive performance sedan, giving the drivers in Northern climates all-season driving enjoyment," said Igo.