CHASSIS CONTROL
What is New Chassis Control?
A car requires suspension, steering and brakes for everyday driving tasks. These systems or components are collectively known as the chassis. The technology that controls the chassis has made major strides since the birth of the car. In particular, computer technology has greatly improved safety and reliability by electronically controlling the chassis, allowing the adoption of features such as Electronic Stability Control.Nissan wanted to develop chassis control technology one stage further by adding additional chassis controls to help deliver a fun, confident and comfortable driving experience. The technology Nissan created is the New Chassis Control, which consists of the following three technologies.
By controlling the engine (drive force) and brakes, this technology can improve driver confidence and comfort when driving over uneven surfaces.
This technology supports drivers by adding engine braking and reducing the burden on the driver when cornering or braking.
This technology helps the driver feel more confident when cornering by controlling the braking on each of the four wheels in response to the driving circumstances, based on the driver's steering, acceleration and braking on winding roads or when entering or exiting an expressway. This can help provide the driver with a more optimal line through a turn.
Zero Gravity Inspired Car Seat
A “fatigue-free” seat for long drives developed in a weightless environment
This technology alleviates fatigue for drivers and passengers when driving, pursuing the ideal posture to make long drives more pleasant, always maintaining seating comfort.
This technology alleviates fatigue for drivers and passengers when driving, pursuing the ideal posture to make long drives more pleasant, always maintaining seating comfort.
Technology Functionality
Ergonomic technology was utilized to analyze, measure and verify fatigue reduction and comfort, leading to the NASA-measured “neutral posture.” In a weightless scenario human posture is weakened and the burden on thebody is at its least, meaning posture does not collapse even over long periods and you are less likely to become tired. By applying this neutral posture to a car seat, it alleviates feelings of fatigue from sitting for long periods of time.
Ergonomic technology was utilized to analyze, measure and verify fatigue reduction and comfort, leading to the NASA-measured “neutral posture.” In a weightless scenario human posture is weakened and the burden on thebody is at its least, meaning posture does not collapse even over long periods and you are less likely to become tired. By applying this neutral posture to a car seat, it alleviates feelings of fatigue from sitting for long periods of time.
Technology Configuration
The system replicates the neutral posture through its shape, providing continuous support from the hips to the back. Developed through joint research with Yamazaki Laboratory at Keio University and using a seat simulator and a musculo-skeletal model for seating analysis, Nissan now has the know-how on the bearing capacity for every body part and the seating surface shape that reduces load to the smallest amount on muscular and spinal areas. Based on this, it has achieved optimal support by controlling local deformation characteristics and the seat back in its initial shape. Fundamentally changing the structure of the seat makes for long drives that are comfortable.
The system replicates the neutral posture through its shape, providing continuous support from the hips to the back. Developed through joint research with Yamazaki Laboratory at Keio University and using a seat simulator and a musculo-skeletal model for seating analysis, Nissan now has the know-how on the bearing capacity for every body part and the seating surface shape that reduces load to the smallest amount on muscular and spinal areas. Based on this, it has achieved optimal support by controlling local deformation characteristics and the seat back in its initial shape. Fundamentally changing the structure of the seat makes for long drives that are comfortable.
Active Ride Control
Realizing a more comfortable ride
When driving, a vehicle will encounter large and small bumps on the road. As the vehicle passes over certain bumps, passengers may feel a fore-aft pitching motion. The Active Ride Control moderates this by controlling the engine and brakes, delivering a smoother driving experience.
Technology Functionality
When the driver depresses the accelerator pedal and engine torque is increased, the front half of the vehicle rises up slightly. Conversely, when the foot is taken off the accelerator pedal and engine torque is reduced, the front of the vehicle lowers back down. The raising and lowering of the front of the vehicle results in the vehicle exhibiting pitch behavior.
Active Ride Control takes advantage of this phenomenon to counteract the pitching caused by bumps. The engine torque is varied slightly according to the bumps in the road surface, which decreases the pitching motion of the vehicle and allows the vehicle’s occupants to have a more enjoyable driving or riding experience.
When driving, a vehicle will encounter large and small bumps on the road. As the vehicle passes over certain bumps, passengers may feel a fore-aft pitching motion. The Active Ride Control moderates this by controlling the engine and brakes, delivering a smoother driving experience.
Technology Functionality
When the driver depresses the accelerator pedal and engine torque is increased, the front half of the vehicle rises up slightly. Conversely, when the foot is taken off the accelerator pedal and engine torque is reduced, the front of the vehicle lowers back down. The raising and lowering of the front of the vehicle results in the vehicle exhibiting pitch behavior.
Active Ride Control takes advantage of this phenomenon to counteract the pitching caused by bumps. The engine torque is varied slightly according to the bumps in the road surface, which decreases the pitching motion of the vehicle and allows the vehicle’s occupants to have a more enjoyable driving or riding experience.
In addition, the vehicle suspension is fitted with shock absorbers which dampen the vertical and pitch motions of the vehicle. When dampening is strong, the motion caused by bumps on the road surface is quickly reduced. Conversely, with weak dampening, the motions caused by bumps can continue for a long time.
Nissan discovered that when the brake is applied, it has the effect of strengthening the dampening of body motion. Active Ride Control includes technology developed to reduce vehicle pitching when passing over a bump by automatically applying a very small amount of braking. The amount of braking is not enough to slow the vehicle down appreciably, but still results in faster dampening of the pitch motion than the vehicle using shock absorbers alone. With Active Ride Control, the pitching that follows when a vehicle passes over a bump is decreased in amount and duration, and the driving experience becomes more comfortable.
Technology Configuration
When a vehicle passes over a bump, the wheels speed fluctuates slightly when compared to the same vehicle driving on a flat surface. Using sensors to detect the change in the speed of the wheels, the system determines when the vehicle is moving up and down.
When the pitching is minor, ride quality can be improved by increasing or decreasing the engine torque. When the pitching is greater, the system applies the brakes and this helps minimize the body motion of the vehicle. The engine torque variations and the brake applications are small and smooth. They calm the vehicle body motion but do not result in appreciable increases or decreases in vehicle speed. This allows drivers and passengers to simply enjoy a more comfortable driving and riding experience.
Nissan discovered that when the brake is applied, it has the effect of strengthening the dampening of body motion. Active Ride Control includes technology developed to reduce vehicle pitching when passing over a bump by automatically applying a very small amount of braking. The amount of braking is not enough to slow the vehicle down appreciably, but still results in faster dampening of the pitch motion than the vehicle using shock absorbers alone. With Active Ride Control, the pitching that follows when a vehicle passes over a bump is decreased in amount and duration, and the driving experience becomes more comfortable.
Technology Configuration
When a vehicle passes over a bump, the wheels speed fluctuates slightly when compared to the same vehicle driving on a flat surface. Using sensors to detect the change in the speed of the wheels, the system determines when the vehicle is moving up and down.
When the pitching is minor, ride quality can be improved by increasing or decreasing the engine torque. When the pitching is greater, the system applies the brakes and this helps minimize the body motion of the vehicle. The engine torque variations and the brake applications are small and smooth. They calm the vehicle body motion but do not result in appreciable increases or decreases in vehicle speed. This allows drivers and passengers to simply enjoy a more comfortable driving and riding experience.
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