Switch ratios

[David A. Cooley]

Yes.

-----Original Message-----
From: Bruce Plecan <nacelp at bright.net>
To: gmecm at esl.eng.ohio-state.edu <gmecm at esl.eng.ohio-state.edu>
Date: Thursday, April 01, 1999 2:47 PM
Subject: Re: Switch ratios


>
>-----Original Message-----
>From: David A. Cooley <n5xmt at bellsouth.net>
>To: gmecm at esl.eng.ohio-state.edu <gmecm at esl.eng.ohio-state.edu>
>Date: Thursday, April 01, 1999 10:41 AM
>Subject: Re: Switch ratios
>
>So then, the rear O2 since it is dealing with thourghly reacted gases would
>need to be the "superior" sensor?.
>  So it's slew rate at Stoich. would need to be much less for the ecm to
see
>the cat con effeciency?.
>Bruce
>
>
>>OOOH OOH  MEMEMEMEME!!!
>>The PCM looks at the Stoich crossings of the pre-cat O2 and the post cat
>>O2...
>>Post cat most likely will be pretty steady.  If the post cat starts
>swinging
>>it's output close to what the pre-cat sensor see's, then it flags a cat
>>failure.  PCM will have params on how close the post-cat O2 must be in
>>cycling to the pre-cat to set the code.
>>There... 70 words!
>
>
>>-----Original Message-----
>>Subject: Switch ratios
>>>Can someone in 100 words or less explain what a swtich ratio is?.
>>>This is in reference to comparing O2 sensors (post-pre cat converter).
>>>Thanks
>>>Bruce
>
>
>