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Title: tmot vs tmst Post by: rob.mwpropane on December 23, 2011, 05:27:41 PM tmot- engine start temperature
tmst- engine temperature What's the difference? Fwiw, I tried looking at it in the FR, but I couldn't figure it out on my own. Happy holidays. Thanks. Title: Re: tmot vs tmst Post by: Rick on December 23, 2011, 06:16:46 PM tmst is the engine temperature when the engine was last started, tmot is current temperature.
Title: Re: tmot vs tmst Post by: rob.mwpropane on December 23, 2011, 08:32:12 PM tmst is the engine temperature when the engine was last started, tmot is current temperature. Thanks Rick. Title: Re: tmot vs tmst Post by: TTQS on December 24, 2011, 08:18:56 AM Hi Rob.
This is sort of explained in the ATM 33.50 section. It was quite challenging to translate and is worth a read because Motronic deals with catalyst temperatures after repeat starts, etc. in quite a clever (but logical) way. To be fair, I don't think you would have got the answer explicitly, but you might have been able to work it out by reading this module. Some quotes: "The initial values for the exhaust and catalyst temperature at engine start can be calculated from the temperatures at switch-off and delay times." "When stopping the engine (C_nachl 0 --> 1) the temperatures tabgm and tkatm are stored. When starting the engine, the initial temperatures tabgmst and tkatmst are calculated from the switch-off temperature (corrected for ambient temperature) and a factor obtained from maps KFATMABKA or KFATMABKK as a function of tabstatm and tatu." TTQS Title: Re: tmot vs tmst Post by: rob.mwpropane on December 24, 2011, 03:42:18 PM Hi Rob. This is sort of explained in the ATM 33.50 section. It was quite challenging to translate and is worth a read because Motronic deals with catalyst temperatures after repeat starts, etc. in quite a clever (but logical) way. To be fair, I don't think you would have got the answer explicitly, but you might have been able to work it out by reading this module. Some quotes: "The initial values for the exhaust and catalyst temperature at engine start can be calculated from the temperatures at switch-off and delay times." "When stopping the engine (C_nachl 0 --> 1) the temperatures tabgm and tkatm are stored. When starting the engine, the initial temperatures tabgmst and tkatmst are calculated from the switch-off temperature (corrected for ambient temperature) and a factor obtained from maps KFATMABKA or KFATMABKK as a function of tabstatm and tatu." TTQS Nope, I mean I see it, but I never would have pulled it from that without being shown. Thank you very much. Happy/Merry Christmas. |