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Old 02-23-2005, 07:11 AM   #76
carlos
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Quote:
Originally Posted by Wally
I reckon I can help all of you save face, while implicitly displaying my large penis:

if I take just one mass produced jap car I can tell you that each selected shift position is fed as a negative signal into the ECU. The signals from the park and neutral switches are also fed into a diode matrix for low signal select, the output signal making the coil of an inhibitor relay.

If you throw the car into reverse while travelling at speed you can expect clutch plates to be damaged, a possible sheared drive shaft and an engine that is getting a good hiding. Sprag clutches are designed for one way operation. But you biggest problem is going to be negotiating the trees and obstacles on the side of the road.
i have no idea what you said, matrix,coil of an inhibitor relay ,huh?
to my knowledege(maybe yours is more extensive than mine)computers don't read in negative or positive they read in digital(1 and 0, on and off)
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Old 02-23-2005, 07:36 AM   #77
Wally
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Quote:
Originally Posted by carlos
i have no idea what you said, matrix,coil of an inhibitor relay ,huh?
to my knowledege(maybe yours is more extensive than mine)computers don't read in negative or positive they read in digital(1 and 0, on and off)

I wasn't writing it in logic level, but I can waffle if you like: discreet binary low passing inputs from each shift switch to the ECU over ride the pullups creating a logic zero that is either/or inverted, filtered, conditioned and passed directly to a multiplexer, PIA port or dedicated I/O on the micro controller where it is digitally processed according to the program, algorithms and closed loop routines in combination with other analogue and binary signals. The discreet binary outputs presumably with flyback circuitry control the shift solenoids.

The park and neutral binary low states are also sent through an OR gate via parallel circuitry, so that either one of the signals operates an inhibitor relay.

Did I tell you I can design industrial controllers too. Goddam I can walk and chew gum at the same time. Quick someone pat me on the back coz my head is stopping me from doing it myself.

DSMer did you spot the deliberate mistakes?
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Old 02-23-2005, 12:49 PM   #78
tbaxleyjr
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Now everyone has graced us with their knowledge of neutral safety switches, ECM's, TCM,s, Wally's anatomy, etc. I think we need to close the thread before this gets much deeper in bull crap than it already has become.
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