- Oct 17, 2012
Nissan previews production steer-by-wire system
As bad as the feedback is on some current EPAS cars, we're a little skeptical about how such a system would feel, but Nissan says that not only will feedback be more direct, it will also be adjustable. Nissan's independent control steering technology will allow drivers to choose between "Sport" and "Standard" modes depending on what type of roads and driving condition they face. An added benefit of this system is that the steering wheel will be completely isolated from the rest of the steering system to reduce road vibrations felt by the driver.
This type of system could be found on Infiniti models within the next year.
This system also uses a camera to help keep the car driving in a straight line, meaning that drivers won't have to make constant small corrections, which Nissan says will reduce driver fatigue, and it can also auto correct in the event of crosswinds. As a safety precaution, Nissan's new steering system uses three redundant engine controllers to prevent any loss of steering, but in the event that the car loses total power, there is a clutch that can engage a backup mechanical link to allow the driver to control the front wheels.
In the event of power loss, there is a clutch that can engage a backup mechanical link to allow the driver to control the front wheels.
Nissan is also working on an autonomous emergency steering system that seems to operate in the same vain as auto brake in some newer cars. If the car detects a possible collision, it will initially warn the driver with an audible tone and display. If this is ignored, it will then proceed to auto brake in an attempt to slow the car down. If a collision is still imminent, the car would then automatically swerve to avoid an accident. There are also sensors that can detect if a car is next to or coming head on with the vehicle to prevent an even worse collision.
Scroll down for Nissan's press releases on this new technology.
To Be On Sale Within a Year
- Delivers responsive performance by controlling tire and steering angles inputs independently-
YOKOHAMA, Japan (October 17, 2012) - Nissan Motor Co., Ltd. today unveiled the world's first steering technology that allows independent control of a vehicle's tire angle and steering inputs. This next-generation steering technology was developed by Nissan.
A conventional steering system directs tire movements by transmitting steering inputs to the tires via a mechanical link. Nissan's next-generation steering technology reads the driver's intentions from steering inputs and controls the vehicle's tire movements via electronic signals. This transmits the driver's intentions to the wheels even faster than a mechanical system and increases the direct driving performance feel by quickly and intelligently communicating road surface feedback to the driver.
The system controls and insulates the vehicle from unnecessary road-generated disturbances to deliver only the necessary performance feel to the driver. For example, even on a road surface with minor ridges or furrows, the driver no longer has to grip the steering wheel tightly and make detailed adjustments, so traveling on the intended path becomes easier.
Accompanying this next-generation steering technology, Nissan has also developed a camera-based straight-line stability system to further enhance on-center driving capability. This system is a world-first*2 technology that improves vehicle stability by making small input angle adjustments so the vehicle will accurately trace and continue as planned in the lane it is traveling. If the vehicle direction changes due to road surface or crosswinds, the system acts to minimize the effect of these conditions resulting in reduced steering input from the driver.
Using a camera mounted above the vehicle's rearview mirror, the system analyzes the road ahead, recognizes the lane direction, detects changes in the vehicle's direction, and transmits this information to multiple electronic control units as electronic signals. If a discrepancy occurs, the system acts to reduce the discrepancy by controlling the opposing force to the tire angle. By reducing the frequency of detailed steering input adjustments, which are a cause of fatigue on long drives, the driver's workload is greatly reduced.
This next-generation steering technology's high reliability is achieved by multiple ECUs. In the event a single ECU malfunctions, another ECU will instantly take control, and in extreme circumstances such as the power supply being disrupted, the backup clutch will act to connect the steering wheel and wheels mechanically, ensuring continued safe travel.
This technology will be equipped on select Infiniti models on sale within one year to provide "Driving as Intended" and "Driving with Peace of Mind" for owners.
*1: World-first development of an independent control steering technology that controls tire and steering angles inputs independently.
*2: World-first development of an accurate tracing technology that enables a driver to continue driving as planned in the lane with small steering angle adjustments (depending on road conditions).
Nissan Announces "Autonomous Emergency Steering System"
Nissan Motor Co., Ltd. today announced the development of the "Autonomous Emergency Steering System."
This system offers a high level of collision avoidance capability by applying automatic braking and automatic steering in situations where a collision is imminent and evading obstacles by braking may not be effective. The system takes effect in situations where unpredictable risks arise, such as sudden intrusions onto the road in low speed zones, or when a collision at high speed is imminent due to the driver's delayed recognition of the tail end of a traffic jam.
Nissan has long worked on the development and commercialization of brake-based control technology. The company has recently promoted development of technology to deal with situations that cannot be mitigated through braking alone. In order to prevent an accident from occurring, technology is needed to identify potential obstacles. Nissan has succeeded in developing technology which, through high-precision sensing technology and on-board control technology, automatically steers the vehicle away from potential collisions, when braking alone is insufficient.
The Autonomous Emergency Steering System, using the information provided by the front-mounted radar and camera, the two left and right rear radars, and the five laser scanners attached around the vehicle, initially acts on a risk of collision that cannot be avoided by braking. Simultaneously, it checks if there is a forward zone free of obstacles and that there are no vehicles approaching from the rear, and then displays to the driver the direction that the vehicle should be steered. If the driver cannot immediately steer in that direction, the system takes over to automatically steer the vehicle to help avoid a collision.
Nissan has established the Vision Zero safety goal, which aims to help eliminate traffic fatalities and serious injuries. The guiding force behind this goal is the concept of the "Safety Shield," which identifies six stages of driving conditions, from "normal driving conditions" through "post-accident condition", and works to provide the most effective counter measure against sources of danger which occur at during each stage. The "Autonomous Emergency Steering System" is based on this initiative.
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