| Kris |
Just read it:
"Brake easy with brake-by-wire
Important components of the vehicles of the future are brakes that have to act effectively and quickly. COMPANY is developing the electronic wedge brake for this application. This works in the 12 V-based vehicle electronic system, taking the place of the traditional hydraulic brake. At the same time it is the first step towards integrating drive, brake and damping in the wheel – the eCorner module."
Interesting info. Hydraulic brake will become history? |
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| njjoe |
quote:
Originally posted by Kris
Interesting info. Hydraulic brake will become history?
Scary :eek:
-njjoe |
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| zebelkhan |
quote:
Originally posted by njjoe
Scary :eek:
-njjoe
I agree. Just imagine some of us haveing BPS problem....., i.e. Brake Positioning Sensor....and I wonder if we could then get a chance to reboot after the crash....:mad: |
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| Kris |
This is maybe scary but this type of brakes are almost reality...... I have photos of them.....if I tried I am sure would get in touch with the development team....
It really puzzles me for one single reason - RELIABILITY!
Just wonder how reliable they are, hope they do not run on Windows! |
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| njjoe |
quote:
Originally posted by zebelkhan
and I wonder if we could then get a chance to reboot after the crash....:mad:
Maybe not, but it would be fun to ask the Service Adviser to get behind the wheel and request him to attempt to replicate the problem. :4:
"Hey Mr. Nissan Service Adviser, I have a problem with my electric brakes. What, you say there is nothing wrong with them? Well, just stand there and I will show you what I mean."
:roadtrip: . . . :eek: . . . :runaway:
-njjoe |
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| Kris |
For those interested. Here is more info and some pics.
What?
The electronic brake-by-wire system operates similar to the principle used in a wedge brake, where the rotating wheel pulls a wedge into the brake chamber and brings the wheel to a stop. During the braking operation a brake pad attached to a wedge is pressed between the brake caliper and the brake disk. As the wheel turns the wedge effect is automatically intensified. This allows any level of braking power with a minimum of intricacy. Unlike the classic wedge brake that completely blocks the wheel, modern electronics with sophisticated sensors and precisely controllable electric motors apply measured force to allow smooth deceleration. Since the wedge brake converts the vehicle’s kinetic energy into braking energy, the wedge brake uses only one-tenth of a hydraulic brake’s energy and works faster. Traditional brake hydraulics, which work with brake fluid or air, are completely replaced by electromechanical components, thus dispensing with today’s brake hoses, brake boosters and brake fluid reservoirs, along with anti-lock systems and electronic stability controls. The Electronic Wedge Brake also replaces the parking brake.
When & Where?
Company is currently conducting a pilot project with a leading European automobile manufacturer and plans to make the new brake system generally available at the end of 2005. The first vehicle equipped with electronic wedge brakes is expected to hit the market as early as 2010, promoting the introduction of electronic brake-by-wire systems.
Why?
Many accidents could be prevented if the available brake distance could be used optimally, thus reducing individual misery and costs to society in general. Intelligent vehicle technologies have already demonstrated that - short of human failure - they can prevent accidents or at least reduce their consequences significantly. With low energy consumption, a simple mechanical construction and low costs, the Electronic Wedge Brake offers better braking performance than is possible with disk brakes. With the Electronic Wedge Brake, automobile manufacturers can build vehicles that provide a maximum of safety at any speed and in any traffic situation where the shortest possible braking distance is essential. The electronic brake features not only more safety, but also more comfort. By doubling as the parking brake, it makes starting from an incline a lot easier - and it brakes much more smoothly than is possible with current techniques. |
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| tmnjmurano |
| Only a little scarier than drive by wire when you think about it. |
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| njjoe |
quote:
Originally posted by tmnjmurano
Only a little scarier than drive by wire when you think about it.
A little scarier?!?! Starting is optional, stopping is mandatory.
-njjoe |
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| goldmu |
Another interesting subject from Kris :)
Looks like those Germans are busy, eh...
Count me among the enthusiasts. Why not? Our lives depend on electronics these days. What about the systems in planes? I'm not a specialist but aren't modern plane control systems (at least Airbus) drive by wire?
The benefits: less weight, mechanically simpler, cheaper. Redundancy can be built in the system so that it is very reliable and even hydraulic brakes fail (happened to me years ago, I had to stop the car using the parking brake). |
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| Kris |
quote:
Originally posted by goldmu
Another interesting subject from Kris :)
Redundancy can be built in the system so that it is very reliable and even hydraulic brakes fail (happened to me years ago, I had to stop the car using the parking brake).
Happened to me too. It was very scary! I still remember every detail even though it happened many, many years ago. I was going 110kph and needed to brake as the car at front of me was slowing down and turning. Pushed the brakes - nothing! the booster quit! Got away safely but still remember this one well....
Airplanes - we were just about to take off a week or so ago when the pilot said - we going back to gates.....engine computer failed....we cannot take off with only one computer working....
Now I think Gonzo will have something to say.....;) |
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| tmnjmurano |
quote:
Originally posted by njjoe
A little scarier?!?! Starting is optional, stopping is mandatory.
-njjoe
Unintended accel/decel can be fatal- and theres no "emergency" backup for that system. |
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| Papermaker |
| Something else to rely on the weak Nissan battery. |
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| Kris |
| For those interested, some "artist impressions" of the new brakes....... |
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| njjoe |
I have no doubt that the engineers can develop an effective brake-by-wire system. Conceptually it is feasible. My concern is with reliability and maintenance.
A drive-by-wire system is simple as compared to a brake-by-wire system. The electric throttle is little more than a rheostat on the pedal and a stepper motor on the throttle plate. If it fails it defaults into limp-home mode.
The electric braking system is an entirely different animal on the reaction side. It needs to generate sufficient clamping force on a disk to stop the car. It needs to engage and disengage several times a second to support ABS. It needs to be impervious to road salts, sand, dirt and water. It should not add any additional weight to the wheel/hub assembly. It needs to be as reliable as the hydraulic system it is replacing. It also needs to be serviceable by non-factory personnel (unlike our CVT). That is a lot to ask.
-njjoe |
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