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Install my own LC1 as OEM O2 sensor emulator 
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LQFP112 - Up with the play
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Joined: Wed Apr 13, 2011 2:35 am
Posts: 110
Before I build and install my own FreeEMS board, I'd better pickup an easier training project to practise. I bought a 99 Buick Century as my backup car, so that I don't need to finish my job in a hurry
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I draw my wiring work on KiCAD
Attachment:
myo2.PNG
myo2.PNG [ 18.29 KiB | Viewed 4553 times ]


These are my tools
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Crimping tool
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LC1
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OEM O2 VS LSU4 O2
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LSU4 O2 is geometry compatible with OEM O2
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Study the OEM harness carefully
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Draw my layout on paper to clear my idea
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This layout is bad, I can't let LC1's ground and O2 signal ground converged too earlier at this point
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Crimp a node for fuse soecket
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When possible, soldering is always better than crimping
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Use heat shrink tube to protect soldering point
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The wire from OEM O2 interface was not made of copper, so choose crimping
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Ready to install
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They must be ground at the same point as ECU were
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Have to uninstall relay and fuse box
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This is the ground I need
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Multiple lugs on the same bolt is not optimal, but I have got no suittable lugs to crimp the three gnd wire together
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move it
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No problem, it's time to calibrate the LC1 and LSU4 O2 sensor
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After all is done, push wire into corrugated tube
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Idle is smooth and stable, check engine lamp won't light. The LC1 controller is smart enough to heat the sensor. I evaluate the resistance of OEM heater, It is only 5 omg, that's said the alternator must provide 2A+ current during the driving. And insufficient current can cause injectors squirt less than ECU expected, and a knock will be a result. The most significant effect was improving power/torque curve, the power output was more smooth than before and there's no free gaps on gas pedal
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AFR at idle, I think it is a little rich. Using a notebook in order to monitor the AFR is awkward. So I decide to buy a bluetooth adapter to replace the RS232 cable and use my android pad to watch the AFR in real time
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Last edited by HotCat on Fri Jun 15, 2012 6:36 pm, edited 7 times in total.



Fri Jun 08, 2012 7:59 pm
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None of your images work. They disallow based on referrer. You need to put them on imgur or something similar. Sorry to break the news. If you try to load one directly you get this:

Quote:
错误
您所请求的网址(URL)无法获取

当尝试读取以下网址(URL)时: http://www.autoimg.cn/album/userphotos/ ... 6f6e23.jpg

发生了下列的错误:

Access Denied.
拒绝访问

Access control configuration prevents your request from being allowed at this time. Please contact your service provider if you feel this is incorrect.
当前的存取控制设定禁止您的请求被接受,如果您觉得这是错误的,请与您网路服务的提供者联系。

本缓存服务器管理员:squid@chinacache.com


Please fix the photos and then we'll respond to your post :-)

Fred.

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FreeEMS dev diary and its comments thread and my turbo truck!
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Fri Jun 08, 2012 9:18 pm
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LQFP112 - Up with the play
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Joined: Wed Apr 13, 2011 2:35 am
Posts: 110
Fred wrote:
None of your images work. They disallow based on referrer. You need to put them on imgur or something similar.
Fred.


Sorry for the huge delay to fix image problem, finally I fix them. I decide to buy a bluetooth adapter and watch the lambda in real time on my android pad


Fri Jun 15, 2012 6:04 pm
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Good work! :-)

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Fri Jun 15, 2012 6:44 pm
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QFP80 - Contributor
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Joined: Sat Mar 31, 2012 6:01 pm
Posts: 79
Location: Hong Kong
cool.... now saving $ for a WB O2 kit... :)


Tue Jul 03, 2012 6:12 pm
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Kenny, have you seen this eval kit?

http://14point7.com/SLC-OEM.php

If you order, specify newer firmware for FreeEMS as we're slowly writing code to talk to it to pull digital values out of it and the older fw had a non-friendly way of delivering the numbers.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Tue Jul 03, 2012 10:01 pm
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TO92 - Vaguely active

Joined: Fri Sep 07, 2012 8:57 am
Posts: 1
HotCat wrote:
I decide to buy a bluetooth adapter and watch the lambda in real time on my android pad

Can you please share how to do this? :P

J.K Nilsson


Fri Sep 07, 2012 10:53 am
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