Thackeray

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Thackeray last won the day on April 17

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About Thackeray

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    Lexus Enthusiast

Profile Information

  • First Name
    William
  • Lexus Model
    IS300h
  • Year of Lexus
    2014
  • UK/Ireland Location
    Greater London

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  1. I'm not very keen on monolithic companies running our lives. I switched to Google from Alta Vista in 2000 and used it for many years for internet search. But now I've switched to Qwant as my default search site. It's as good as Google 90% of the time and it doesn't track your web activity. But I occasionally switch back to Google for StreetView which Qwant doesn't have.
  2. There seemed to be a lot of publicity about self-driving cars about five or six years ago. Here's a video about Mercedes from 2014 which makes the same point that legislation will need to catch up. But since then I've been struck by how the majority of comments in newspapers or web forums have been generally negative about self-driving cars. People say they wouldn't trust the machine, they'd rather be in control of the car and so on. My own view is that I'd rather all these cars around me were controlled by computers than by drunk 17-year-olds or bank robbers on drugs trying to evade the police. (I know - that hardly ever happens but you know what I mean.) In a plane, I feel more comfortable 10 seconds after takeoff when I assume that the autopilot has been engaged. Computers are not autonomous entities; they are expert systems that embody all the knowledge that human beings have been able to embed in their operation. And the computers don't get tired. (Or if they do, there's usually a backup computer or two to take over in planes and probably in cars of the future, too.) So personally, I've been waiting for the naysayers to evolve. Of course, there will still be car enthusiasts who want to drive cars. There are still horse enthusiasts who want to ride horses. But if you're 17 in 2025, why would you bother to pay a thousand or two to pass your driving test when your phone will bring a self-driving taxi to your door in three minutes? If you want to go to a pub in the evening, why would you want to go in your own car and not be able to drink any alcohol? When you're 25, why would you want to spend thousands to own a car, (unless you're an enthusiast) with all the expense, parking problems and hassle of looking after it? So you get to the age of 35 and still haven't learnt to drive and still don't own a car. You're unlikely to change your habits now. And from the business point of view, drivers cost a lot of money. Eliminate the driver and your profits rise substantially. So there will be continuous financial pressure for self-driving vehicles.. Dealing with the resulting unemployment from drivers losing their jobs is something the business people will leave others to worry about.
  3. I expect this must be a software limit imposed for various reasons. For example, if the engine is spinning at 2000 rpm, MG1 is spinning at nearly 8000 rpm. I think it can safely go a fair bit faster but I don't know what the limit is. At the same time it's drawing energy from the battery. Again this looks unlikely to be anywhere near a safe limit as it's only drawing 1.5 kW to turn the engine at 1500 rpm so it's unlikely to be much more than, say, double that amount. In addition to that, all this torque in the planetary gearset means there must be a tendency for the car to start moving. The designers presumably didn't rely on the parking pawl in the gearbox to keep the car stationary when Park was selected and couldn't assume the parking brake would be on. So more counter balancing power must be fed to MG2 to keep the road wheels stationary. Otherwise, there's no reason for the car not to start moving when the engine is turning at 2000 rpm. I imagine these are some of the factors behind the limit of 2000 rpm.
  4. The data is gathered by Hybrid Assistant, and its partner app Hybrid Reporter draws the graphs. Zotto reported in another thread a few days ago that Hybrid Reporter has now been integrated into Hybrid Assistant but I haven't tried the integrated version yet. Bear in mind that this is produced by a group of Italian enthusiasts and they only do an Android version so it isn't available for iphone. They also list which OBD connectors have been tested and which ones they know don't work with their app.
  5. There's a useful website called HowManyLeft.co.uk. This is a spare time website set up by "a developer and car geek", according to the background page. It takes the publicly available DVLA statistics and feeds them into an easily accessible website format. According to this there were 123 Sport + Autos registered in the second quarter of 2020 and four SORN. This is the link. You'll see that these come under the heading of LC600. Is there an LC600 or is this a typo? Most of the LC500s are listed under this heading. In addition there's another section headed LC500. Adding the totals for both these sections gives 367 registered if I've added those up correctly.
  6. Thanks for that update. I've now spotted that you recommended Hybrid Assistant a couple of years ago. If you're in Italy do you have any connection with the developers? You mention an Italian forum that's connected with its development. (I realise that Italy is a big country and asking if you know the developers is a bit like when I visit America and Americans ask me if I've met the Queen. )
  7. It seems they are. See this page https://hybridassistant.blogspot.com/p/faq.html
  8. You need to push the accelerator a bit harder than you might when driving normally. I also originally thought it wouldn't rev. But I found that if you give the accelerator a firm push, it will, on my car, at least.
  9. Here's an oddity I was unaware of. Over the past few months of enforced idleness, it's been established in other threads that you don't need to drive the car to charge the 12v battery. It's enough to set it to Ready state and leave it alone. You don't need to go for a drive unless you want to, as this will use more petrol than leaving the car stationary. How to charge the hybrid battery has also been discussed, though generally this isn't necessary unless you plan to park the car unused for several months. It's been suggested that if you want to do this, revving the enine might increase the rate of charge and intuitively it looked as if this must be right. But I was puzzled to find that when you do rev the engine the dashboard energy flow graphic shows that the charging stops when you increase the rpm of the engine. Then charging resumes when you release the accelerator to allow the engine to idle. I thought this might be to protect MG1 from excessive speed. I've now discovered that this is wrong, courtesy of the data from Hybrid Assistant. If the engine is not running, Hybrid Assistant shows around 0.2-0.3 kW are being drawn from the hybrid battery (or 0.7 if you have the air conditioning compressor running). Just to try it out, I pressed the accelerator to check that you could rev the engine, even when it wasn't already running. Sure enough the engine revved up to around 1500 rpm and the battery charging stopped, the same as if the engine had been running before touching the accelerator. But then I noticed something strange. With the engine stopped the HA app was showing 0rpm and 0kW output for the engine and around 0.3kW drawn from the hybrid battery to keep the car's electronics etc going. But when I revved the engine, I could hear the engine turning and these readings changed to 1500 rpm but still 0kW output. At the same time the battery readings rose to around 1.5 kW being drawn from the battery. This is power being taken from the battery - not the amount of charge being fed into the battery. So what this indicates is that when you "rev" the engine, it isn't actually using any fuel. What's happening is that MG1, powered by the battery, is spinning the engine and running down the battery charge, rather than increasing it as common sense would suggest. If this is all correct, the conclusion must be that to increase the charge of the hybrid battery, it doesn't help to "rev" the engine. Counterintuitively, instead of charging the battery, this will run the battery down.
  10. Have you looked at its partner app Hybrid Reporter? This gives an extensive report of statistics for each trip. For example, as a brief snippet from a trip report here's a chart showing the number of brake events during a trip: Brakings 59 Good Brakings 52 Bad Brakings 4 Mixed Brakings 3 Braking Efficiency 90.68 % Braking while moving 10% Longest brake event 0:26 sec Total energy recovered by braking 0.554 kWh It will even produce a street map showing where you braked, where you accelerated and where you coasted.
  11. On the IS300h (and I imagine other Lexuses and Toyotas are similar) the limit doesn't seem to be the motor/generator. I don't know the exact number but on this car MG1 has a capacity of around 40 kw. The battery, however, has charge and discharge limits of around 23-25 kw. These numbers vary with temperature and state of charge. My guess would be that a bigger battery could take higher charge and discharge rates. (I hope someone will correct this if it's wrong.) If this is the case, to get more regeneration you would need a battery that was bigger (takes up more boot space) heavier (reduces fuel economy) more expensive (pushes the retail price up). So the current configuration was presumably the best compromise at the time the car was designed. These factors will change as batteries get cheaper, smaller and lighter.
  12. Just remembered the graphic doesn't work on Android (phone or tablet, for example.). You can display the page but the graphic at the bottom of the page is missing. It still works on Windows, though, if you can try it on a laptop or desktop computer.
  13. One of the reasons I got a hybrid Lexus was the mechanical simplicity of the hybrid system. It has no starter, no clutch, no torque converter, no gearbox (in the sense of something that changes physical gears) no separate alternator. Instead it has two electric motors and in my experience electric motors are typically very reliable. It has a permanently engaged set of cogs (in a planetary gearset) that directly link one of the electric motors to the rear wheels via a driveshaft and a differential. (At least that's how the IS300h works and I think the GS is also rear wheel drive.) So all those things that might go wrong on conventional cars are simply not there. What it does have is some clever computer programmes controlling how fast the electric motors turn. But electronics don't have the physical wear that mechanical components have. So the expectation of mechanical reliability was one of the things that persuaded me to go for the IS300h. You say you know nothing about hybrids and I can't tell if you're just being modest! But just in case you haven't seen this before this is the best page I've seen for explaining how the gears work. The transmission is sometimes called a CVT, an eCVT, a power split device (PSD) and perhaps some other names that I can't remember. But have a look at the graphic at the bottom of the page to see how it works - (you may have to allow Adobe Flash to run) . It shows how simple the transmission is. When these cars were first launched there was obviously a concern about how expensive the batteries would be to replace. But with the pressure to switch to all-electric cars, the cost of batteries has been falling sharply for the past 10 years or so. In 2010 batteries cost around $1,000 per kwh but the cost is now down to around $150 per kwh and is expected to fall still further to around $100 per kwh in the next two or three years. At the same time, experience has shown that on average the Toyota/Lexus hybrid batteries have been quite long lasting. By contrast, if you stick to a similar age conventional car you have to wonder how much it would cost to repair or replace a conventional gearbox or torque converter. My thinking when I chose my current car was that battery prices would continue falling but I couldn't see mechanical gearboxes, clutches, torque converters and so on getting any cheaper to fix.
  14. Maybe it was in an accident and the error codes have been reset after the pop-up hood was deployed. Does every metal panel still have its VIN sticker? Missing stickers suggest non-Lexus standard bodywork repairs. If the stickers are there, it's more likely that if it has been repaired any work has been done to Lexus standards.
  15. Absolutely right. When the car is in the Ready state it feeds around 14-14.5 volts into the 12 volt circuit whether the car is moving or stationary. The advantage of it being stationary is that you use a lot less petrol to charge up the 12v battery than if you were driving around. You also don't have to drive around in the dark unless you really want to!