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Home > Technical > Webasto... Who is after a project? |
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stownrow Member Since: 12 Mar 2010 Location: Harlow Posts: 461 |
Just spotted this:
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3rd Jan 2012 12:23 pm |
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chicken george Member Since: 05 Dec 2007 Location: N. Yorks Posts: 13289 |
you could possibly wire a timer in so it stopped a few minutes after the ignition was switched on?
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3rd Jan 2012 3:04 pm |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
For the user the heat may be the same, but in the same time, despite the electric heater that warms up only the air that enters the cabin, in the FFBH case, the engine's warmed up a lot faster which is more important for the engine's and its components' life.
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3rd Jan 2012 3:50 pm |
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redlabel Member Since: 28 Feb 2010 Location: Tromsoe Posts: 396 |
Hi!
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5th Jan 2012 8:54 am |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
No, it's not like that. This is just propaganda. The TTV can run in two modes: auxiliary heater and parking heater. The auxiliary heater means it is ONLY driven through CAN, by the car, and helps to heat up the engine quicker. The condition is that the temperature to be below +5 degrees C. With the only draw back that if you have the HVAC turned off, then the heater wont start also. In parking heater mode the heater can be also be started, independently from the engine, through the heater's W-Bus port even if the engine is off. The condition is that the temperature to be below +15 degrees C. By default, from factory, the TTV works only in auxiliary heater mode. So, if you want for that 1533 timer to work (or Telestart T91, or any W-Bus capable device), you must update the car's CCF and the firmwares in the CJB, ECM, HVAC and FFBH. That because the TTV FFBH is on the low speed CAN, like HVAC, who is commanding it, and the info about temperature is taken from the ECM which is on the high speed CAN. The only common point for all these is the CJB. This is done by the dealear's tools by entering in "Add/Remove Accesories" section and execute "Add Telestart Diesel Engine Pre-Heat". Without executing the "Add Telestart" option, the heater will not acknowledge the parking heater command (given by 1533, T91, etc) and will not start. In fact it will be blocked by the HVAC and CJB, through CAN-bus, to do it. That's why you need to update the firmware in those modules.
Not yet, for the moment I was interested only in preheating the engine. For starting the fan, you'll have to insert your commands into the fan's module as the fan is driven by a PWM signal from the HVAC module. This is the elegant way. You could also do it by separating with relays the fan and when the ignition is off, you will drive the fan by yourself. Maybe on the near future, if I will have time. Last edited by alex_pescaru on 5th Jan 2012 12:14 pm. Edited 3 times in total |
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5th Jan 2012 9:28 am |
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Martin Site Admin & Owner Member Since: 18 Feb 2006 Location: Hook Norton Posts: 977 |
Alex - see the Danhag thread on DISCO3, I've got one of their GSM dialler WBUS controllers and the HVAC fan controller and it works well
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5th Jan 2012 9:32 am |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
Yes, but the Disco 3 HVAC configuration is quite different from the FL2's...
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5th Jan 2012 9:36 am |
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redlabel Member Since: 28 Feb 2010 Location: Tromsoe Posts: 396 |
Thank you for the info Alex. Will look into this now.
FL2, TD4 HSE The flaming Orange! |
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5th Jan 2012 9:45 am |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
There must be below +(plus)15 degrees C, not -15.
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5th Jan 2012 12:11 pm |
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Ralphk Member Since: 03 Apr 2009 Location: Skulking around with me golf clubs Posts: 476 |
slightly to one side really but can you all remember when Alex first came on the forum and he was apologising for his English. I have just read through this topic and he may as well go back to his native language because I can't understand a word of it and I don't think that the English is the problem. Ralph
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5th Jan 2012 12:41 pm |
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redlabel Member Since: 28 Feb 2010 Location: Tromsoe Posts: 396 |
Haha Alex really know his stuff and to follow him you have to know the all the short forms of the name of the components
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5th Jan 2012 12:53 pm |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
From what I've seen during tests and by monitoring the FFBH sensors, it takes about 10 minutes to raise the temperature from 0C to about 80C during which time FFBH works full power (5kW). BUT, once the 81C mark has been hit, the FFBH enters in low power mode (2kW). The next 5 minutes you'll see the temperature dropping back to about 70C and then, in the following minutes, slowly raising back towards 80C target. So you can draw a conclusion from here: the water is quickly warming up, but the big hunk of metal below your hood is having a quite big thermal inertia. So I believe that after 15 minutes, even if the water temperature is about 70-80C, the temperature inside the engine head (top of the cylinders) is not above 30 degrees. But anyhow, 30 degrees is like you start the engine from cold in the summer time. Quite OK, in my oppinion. 15 minutes is how I also programmed my home built w-bus capable device. Now, of course, with a much lower initial temperature the time may need extending. I've read somewhere that the time for preheating should be about equal with the trip time. If you have a trip of 30 minutes, then set it for 30 minutes. This way you will efficiently use the battery which will not drain too much. The FFBH consumes about 45W at full load and about 30W at partial load. Of course, much more in the first couple of minutes when the FFBH is starting and the glow plug is operating. |
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5th Jan 2012 3:39 pm |
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shilen Member Since: 29 Feb 2008 Location: In the Middle Posts: 1774 |
think I will stick with putting on a thicker jumper on cold mornings... |
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5th Jan 2012 3:55 pm |
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redlabel Member Since: 28 Feb 2010 Location: Tromsoe Posts: 396 |
Thanks Alex. Once again..... FL2, TD4 HSE
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5th Jan 2012 9:29 pm |
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