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I grew up inland in Norway, where the winter air was super dry, like outdoors RH down to 20% (everyone had humidifiers in their homes to prevent wood from drying out so much that it would crack up), and no wind at all - we used to joke that if the aspen leaves are moving, the local newspaper will make a story about the storm. (For those of you unfamiliar with aspen: The tremble all the time, even when the wind is so weak that you hardly will notice it at all.) We had no idea what 'wind chill factor' was about when it was included in the weather forecasts.
We didn't consider it 'real winter' until the temperature fell below -20°C. In school, we where kicked outdoors in the breaks between lessons, to get some fresh air. The limit for being allowed to stay indoors was at -20°C outdoor temperature.
Nowadays, I live by a fjord. The air is a lot more humid; 0°C is a lot colder than -20°C where I grew up. If we also have a 10 m/s wind, the frost is unbearable, even with only a couple degrees below zero.
Yet, I still think of 'wind chill' primarily as an argument in a "Mine is bigger than yours!" quarrel. It certainly is essential to the effect on the bare skin you expose outdoors. It is completely irrelevant to any mechanical device (such as starting your car, or the low-temperature battery capacity loss of your electric car). If it marginally affects the required heating of your house, then the insulation is far too poor. (At least by Norwegian standards - our houses are extremely well insulated.) When someone refers to the wind chill adjusted temperature only, my immediate thought is 'Oh well, so you want to sound impressive. Fair enough, but maybe I am not that impressed, especially if you are not talking about being out walking in the wind."
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22 C in Bangalore, Southern India. And it's likely to grow hotter.
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I sympathize. I had to go to an *OUTDOOR" wedding yesterday, with temp around 72F , descending to mid 50s by dusk. After living 30 years in Alaska, I just about froze my tookus off  
Thar's only two possibilities: Thar is life out there in the universe which is smarter than we are, or we're the most intelligent life in the universe. Either way, it's a mighty sobering thought. (Porkypine - via Walt Kelly)
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It was 28 F here in New Orleans this morning. I stayed in bed! Not used to that cold weather, otherwise I would move up to Maine. Seriously!
ed
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Brrrrr.... It's balmy 70°F here.
Will Rogers never met me.
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A team that can make a bubble that lasts a year could be incredibly valuable in extending the life-span of MS bubbles, like the latest previews of Maui, that never work, and now barely last a few months: [^].
A leaked document suggests the French demands for not having Windows 11 installed, and, for a permanent guarantee that only the appellation "Les Bubble" will be used are being discussed ... the demand no Happy Meals will be sold on the Lille campus is meeting strong resistance at MS.
Another purported internal memo records a senior MS executive's opinion: "Compared to Activsion, we should be able to get this one for chump change."
«The mind is not a vessel to be filled but a fire to be kindled» Plutarch
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There are plenty of rioters in the good ol' USA; why would they need to buy a job lot of French student rioters?
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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I`m trying to get an impression/idea about how complex software found in cars can get.
To start with there was a scandal a couple years ago that had at its heart the issue of a car producer making the software in charge with reading `exhaust quality` display false results. That got me wandering what`s the point of having such a piece of software on board of each car. To my mind all engines found inside same model cars produce exhaust in the same amount and of the same (chemical) formula if subjected to identical conditions.
I`m curious about this exhaust reading software. My guess is that it`s sensors recording the gas formula but are the sensors always on, like does the driver get a real time display of the recoded result as he is driving the car?
Also my sister has a car that has a digital display (LCD screen) of the speedometer and all the other information that is usually displayed through analog methods/indicators. The car has also a display that shows what is recorded by the car front and rear cameras. Then there is the radio and music information that is displayed digitally as well. My question is there a centralized operation system behind that manages all of it?
Then there is of course the question of Tesla cars which have an even higher number of sensors and higher complexity in the way the sensors operate.
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There are many processors in modern cars from little uControllers to "proper" CPUs. The infotainment system is just one of them - and that one can be quite spectacularly powerful. For example, the Hyperscreen in the Mercedes EQS uses 8 CPU cores and 24GB RAM (which is more than my desktop PC has!)
This may help you understand just how much processing is going on: Adventures in Automotive Networks
and Control Units[^]
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I have found in your post more than one thing I could use/follow further.
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One car coming out of the line today might have some million lines of source code working inside.
They have (depending on the manufacturer and the model) up to 150 controllers. The new E³ architechture brings the HPDC Controllers (5 to 7 units) and those are really powerful.
CalinNegru wrote: My question is there a centralized operation system behind that manages all of it?
The system is a tree, there are several communication bus and in each of them there is a master coordinating everything and communicating with other masters. Each Master has a group of subordinates, some are slaves some are independant cpus that just are in the same communication segment.
Up to now the highest CPU in the "hierarchy" was the Gateway, in the new E³ it will be the HPDC-1. Although I think that everyone is equally important, because nothing works without every one working fine.
In the past, you could get a screw driver and fix some things, current cars... forget it. You need not only a PC, you need software, connection to restricted systems and the knowledge to not do more harm than anything.
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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That "exhaust quality display" was far more than just the display. The car detected when it was on a dynameter and actually changed the engine and emissions tuning to pass the emissions tailpipe test.
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The answer to your question is automotive software is generally incredibly complex and poorly structured. NASA's full report on the Toyota unintended acceleration in the 2000s slammed Toyota for such poor software design and architecture that they (NASA's software engineers) couldn't say for certainty that Toyota's software wasn't causing unintended accelerations.
In addition, it appears automakers have used techniques out of the 60s for their control software. Techniques such as timing loops that can't be ported to newer, faster hardware; no abstraction of hardware layers; etc. This became apparent last year when the CEO of Intel Corp. chastised the auto industry for wanting the integrated circuit industry to reopen foundries for 20 year old chip technology. Tesla and other EV startups appear to have avoided this issue by using modern software design techniques so that when one chip became hard to get they were able to switch to other chips to continue manufacturing.
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Amen.
Probably the best-designed part of the software is the entertainment deck, which typically runs Android.
The actual control software for the car is a cluster-![Elephant | [mastadon]](https://codeproject.freetls.fastly.net/script/Forums/Images/elephant.gif) 
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Daniel Pfeffer wrote: Probably the best-designed part of the software is the entertainment deck, which typically runs Android.
That says a lot
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I believe that @den2k88 works on this type of software, but I don't know if he'd be willing to tell tales out of school.
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Things evolved. Mostly from 2005 onwards, thanks to self promoted commitees like GENIVI and the ISO26262 regulations. AutoSAR also added some layer of standardization, though its drawbacks are heavy and I can't speak openly of them.
obermd wrote: modern software design techniques so that when one chip became hard to get they were able to switch to other chips to continue manufacturing.
It's a half hoax. Model based design has a single software suite on the market produced by a monopolits company whose name starts with Math and ends with Works. They overcharge their licenses and the courses (3 day lesson for 2 people is over 25k€) and it can elegantly abstract the control parts of the vehicle (PI control, retroaction loops) but not the application part (i.e. diagnostic protocols like UDS and customer dependent behaviors) and definitely not the hardware part - all the drivers are supplied by the manifacturer but the HAL must be written manually to ensure compatibility with the model. And the generated code is significantly bigger and slower, which is an issue in a market where most ECUs are 40 Mhz processors with 64kB of flash memory and 3 to 6 kB of RAM.
Tesla and other EV startups are marketing towards very high prices anyway so they will use more integrated (and proprietary) logic with more powerful ECUs... with the underlying issue that ECUs are active even when the car is off, and more powerful logic consumes more power than less powerful logic.
obermd wrote: This became apparent last year when the CEO of Intel Corp. chastised the auto industry for wanting the integrated circuit industry to reopen foundries for 20 year old chip technology
Mosti automotive components must work from -40°C to 155°C, they must be EMI compliant and automotive safe. They have to be validated (and automotive validation is second only to biomedical as for anal retentiveness) and certified as safe. Many manifacturers will prefer something that works for sure rather than something shinier, better, bigger that kills a dozen people. Wether you're driving an EV or an ICE, you're placing your ass on what's essentially a bomb with a carefully controlled energy dispersion. Don't mess with that control.
GCS d--(d-) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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den2k88 wrote: Mosti automotive components must work from -40°C to 155°C, they must be EMI compliant and automotive safe. They have to be validated (and automotive validation is second only to biomedical as for anal retentiveness) and certified as safe. Many manifacturers will prefer something that works for sure rather than something shinier, better, bigger that kills a dozen people. Wether you're driving an EV or an ICE, you're placing your ass on what's essentially a bomb with a carefully controlled energy dispersion. Don't mess with that control.
I did a little research - SpaceX uses three dual core x86 processors in the Falcon 9. These off the shelf processors handle radiation (via redundancy) and temperature swings from -150C to +150C. The legacy automotive industry is in serious denial about modern processors.
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Or adding 50-100$ (minimum, consider that printing PCBs is costly and scales with the size of the PCB, which scales with the components used) of cost for everyone of the 50-150 ECUs on a car will inflates its price so much it becomes unmarketable at all. SpaceX is a billionaire pet project with high costs for every unit produced, comparing it with a mass market industry is definitely inadequate.
Engineers: balancing time constraints, safety, functionalities and costs since the dawn of time.
GCS d--(d-) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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obermd wrote: is automotive software is generally incredibly complex and poorly structured.
Well thank god that doesn't happen in every other industry. For example what would be the state of things if banks were still using COBOL code.
obermd wrote: Techniques such as timing loops that can't be ported to newer, faster hardware; no abstraction of hardware layers; etc.
Yet another thing that no other industry ever does. Be a real shame if every industry didn't plan for every new and unknown technology innovation coming in future years. And certainly CEOs and CFOs are so willing to provide that extra budget to provide for all of that.
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CalinNegru wrote: My guess is that it`s sensors recording the gas formula but are the sensors always on,
Yes.
CalinNegru wrote: like does the driver get a real time display of the recoded result as he is driving the car?
Sorta. "Engine trouble" light going on and car refusing to start are technically realt time display.
CalinNegru wrote: To my mind all engines found inside same model cars produce exhaust in the same amount and of the same (chemical) formula if subjected to identical conditions.
Conditions is the keyword: age, cleanliness of the fuel system, quality of the fuel used, wear and tear, driving style (which isn't as simplified as sportive, eco, family. Many things impact fuel economy and exhaust). Also engine control mostly balances air and fuel to go as lean as possible, depending on what's asked from the driver, air pressure, humidity and temperature.
CalinNegru wrote: My question is there a centralized operation system behind that manages all of it?
No*. Every single ECU is independent from the others and communicates through one or more communication buses: for ECU working in the car's logic (i.e. instrument panel, pedals, lighs, tow-rope) they're usually CAN lines, for small actuators on the periphery of the car's logic (i.e. electric windshields, engine cooling fan, oil pumps) it's usually a single LIN line if not just a PWM signal, which is piloted by a more complete ECU.
*All these systems are managed by the BCM, aka body computer, which is the main intelligence in the car that controls the overall behavior of the car. Many functions are now replicated on the IPC (instrumentation panle) for redundancy. The actual topologies vary from platform to platform and are trade secrets.
CalinNegru wrote: Then there is of course the question of Tesla cars which have an even higher number of sensors
Where does this information come from? Electrical vehicles have a lot less parts than a ICE vehicle, and the ADAS systems on a Tesla are only marginally better than those of high end cars (talking about Audi level, not even luxury cars). As far as I know Tesla cars are simpler but have more integrated software and more intelligent peripherals, discharging a lot of load from the BCM. But they can do it: they produce all their components in house. There are no "compatible vendors" and no "off-the-shelf" components - it's all extremely proprietary and they're pushing to forbid drivers from opening their cars' hoods (unverified, I have a video in my waiting list to check out on the topic but I still haven't).
GCS d--(d-) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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Just got this email:
Dear Friend, good day,
I apologise for invading your privacy, especially by contacting you through this means. I am Martial Douti, an attorney by profession here in the Republic of Togo. I have a Business Proposal of nine million eight hundred thousand dollars for you to handle.
Please contact me for more information if this interests you.
Regards,
Martial Douti, esq
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.
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Martial Douti?
Isn’t he the cousin of Nigerian prince Buchi Olawale? Go for it! Those guys are connected!
If you can't laugh at yourself - ask me and I will do it for you.
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Maybe he can teach you something about martial arts too!
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