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The mkiv Supra Owners Club

Strange controller...


xxcat
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I found this if it is any insight?

 

http://www.patentstorm.us/patents/6685597-description.html

 

PROBLEMS (taken from link)

 

 

For example, if the line pressure is insufficient with respect to the input torque of the transmission, the friction element tends to slip thereby causing a loss of power transmission besides degrading the durability of the friction element, while degrading the shift quality in that the actual shift is felt as being retarded. On the contrary, if the line pressure is excessively high with respect to the input torque of the transmission, the drive load of the oil pump for generating the line pressure becomes unnecessarily high, thereby deteriorating the fuel consumption of the engine and/or degrading the shift quality in that a large shift shock occurs upon shift operation.

 

 

ANSWER (From text again)

 

In an attempt to overcome these problems, there have been proposed various methods for controlling the line pressure to a value according to the input torque of the automatic transmission. Thus, for example, JP 9-303541A discloses a shift control system wherein the output torque of the engine at the front stage of the automatic transmission is estimated from the engine rotational speed and the engine load (throttle valve opening) as taught by JP 3-41256A, and the input torque of the automatic transmission is calculated from the estimated engine torque and the operation state of a torque converter, so as to be used as the basis of the line pressure control.

 

 

You can read up a load more info on the link - hope that helps a little.

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But if it's so easy and usefull to control the pressure - why it's not from factory? :) And why it's not very popular (I don't see much info about this mod on forums)...

 

it just enables the autobox to change quicker, i know its pretty popular on the 300zx so cant see why it wouldnt work on the supra as well :)

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