Subaru CAN Fast in V1.44

Subaru CAN Fast in V1.44

Postby Jochen_145 » Thu Jan 03, 2013 2:52 am

Hallo,

in actual version of ECUflash V1.44 is a new Subaru CAN Logging option for standalone logger:

Subaru CAN Fast

What is the differnce between normal SubaruCAN ?
In configuration, I cannot see any, what am I missing ?

Jochen
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Re: Subaru CAN Fast in V1.44

Postby hunterjm » Thu Jan 03, 2013 7:27 am

Jochen_145 wrote:What is the differnce between normal SubaruCAN ?
In configuration, I cannot see any, what am I missing ?


CAN fast requires that you check the patch in EcuFlash at the bottom after loading up your ROM. It enables logging of RAM parameters (the ones that start with 0xFF) in your logcfg.txt. It also compresses the 4 byte parameters (RAM params) into 3 bytes in the request hence enabling "fast" logging.
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Re: Subaru CAN Fast in V1.44

Postby Jochen_145 » Thu Jan 03, 2013 9:30 am

Thanks for your explementation :-)


I hoped that this kind of CAN-Logging will also increas the samplerate of normal CAN-Logging.

That the EURO5 Diesel we only get value refresh every 1/4 secund, but CAN-values every 25ms, so a lot constant values to log.
Logging with his sample rate will not give exact details.

Is there any chance to increase the value refresh, like fast-poll will do on k-Line based logging?

BR
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Re: Subaru CAN Fast in V1.44

Postby hunterjm » Fri Jan 04, 2013 4:14 pm

Jochen_145 wrote:Thanks for your explementation :-)


I hoped that this kind of CAN-Logging will also increas the samplerate of normal CAN-Logging.

That the EURO5 Diesel we only get value refresh every 1/4 secund, but CAN-values every 25ms, so a lot constant values to log.
Logging with his sample rate will not give exact details.

Is there any chance to increase the value refresh, like fast-poll will do on k-Line based logging?

BR

Not sure what you mean. CAN is automatically much faster than K-Line... even with fast polling. I get 40 samples/second over CAN. Not sure why you would need more than that.
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Re: Subaru CAN Fast in V1.44

Postby hunterjm » Fri Jan 04, 2013 4:21 pm

Jochen_145 wrote:That the EURO5 Diesel we only get value refresh every 1/4 secund, but CAN-values every 25ms, so a lot constant values to log.

Also, 25ms = 1/40 of a second, or 10x faster than K-Line fast poll
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Re: Subaru CAN Fast in V1.44

Postby Jochen_145 » Sat Jan 05, 2013 12:19 am

hunterjm wrote:Not sure what you mean. CAN is automatically much faster than K-Line... even with fast polling. I get 40 samples/second over CAN. Not sure why you would need more than that.


Sending freqeunzy of CAN is about 40ms, but the values witch are sended are not refreshed each time the ID is sended.
So you will get a lot constand values until the value is actuallisated.

CAN frequency does not corrosponden to refresh rate of the log-values, you get:

See log:
sample time Drehzahl_(rpm) Fahrpedal_(%) entg黮tige_Einspritzmenge_(mm3/St)
56 112,88 797,5 0 5,04297
57 112,90 797,5 0 5,04297
58 112,92 797,5 0 5,30469
59 112,94 797,5 0 5,30469
60 112,96 797,5 0 5,30469
61 112,98 797,5 0 5,30469
62 113,00 797,5 0 5,30469
63 113,02 797,5 0 5,30469
64 113,04 797,5 0 5,30469
65 113,06 797,5 0 5,30469
66 113,08 797,5 0 5,30469
67 113,10 797,5 0 5,30469
68 113,12 797,5 0 5,30469
82 113,40 1092,7 8,98438 10,8359
83 113,42 1092,7 14,4531 10,8359
84 113,44 1092,7 14,4531 21,3633
85 113,46 1092,7 14,4531 21,3633
86 113,48 1092,7 14,4531 21,3633
87 113,50 1092,7 14,4531 21,3633
88 113,52 1092,7 14,4531 21,3633
89 113,54 1092,7 14,4531 21,3633
90 113,56 1092,7 14,4531 21,3633
91 113,58 1092,7 14,4531 21,3633
92 113,60 1092,7 14,4531 21,3633
93 113,62 1092,7 14,4531 21,3633
94 113,64 1092,7 14,4531 21,3633
95 113,66 1300,25 14,4531 21,3633
96 113,68 1300,25 8,59375 21,3633
97 113,70 1300,25 8,59375 12,6133
98 113,72 1300,25 8,59375 12,6133
99 113,74 1300,25 8,59375 12,6133
100 113,76 1300,25 8,59375 12,6133
101 113,78 1300,25 8,59375 12,6133
102 113,80 1300,25 8,59375 12,6133
103 113,82 1300,25 8,59375 12,6133
104 113,84 1300,25 8,59375 12,6133
105 113,86 1300,25 8,59375 12,6133
106 113,88 1300,25 8,59375 12,6133
107 113,90 1300,25 8,59375 12,6133
108 113,92 1129 8,59375 12,6133
109 113,94 1129 15,625 12,6133
110 113,96 1129 15,625 19,5664
111 113,98 1129 15,625 19,5664
112 114,00 1129 15,625 19,5664
113 114,02 1129 15,625 19,5664
114 114,04 1129 15,625 19,5664
115 114,06 1129 15,625 19,5664
116 114,08 1129 15,625 19,5664
117 114,10 1129 15,625 19,5664
118 114,12 1129 15,625 19,5664
119 114,14 1129 15,625 19,5664
120 114,16 1129 15,625 19,5664
121 114,18 1102,75 15,625 19,5664


Also, 25ms = 1/40 of a second, or 10x faster than K-Line fast poll

Not really:
at diesel ECU K-Line will provide new values every 65ms if you log about 13 values, so it is nealy visa verse:

Time (msec) Einspritzmenge endg黮t. (vol.) (mm3/st) Luftmasse Ist-Wert (mg/st)
0 21,0234 460
62 21,1758 460
141 21,2383 470
203 21,3164 470
266 21,3477 470
344 21,4258 480
406 21,4453 470
469 21,5312 470
531 21,375 480
625 21,2344 470
672 21,3164 480
734 21,293 480
812 21,8125 480
875 22,9375 480
937 24,9336 490
1016 27,0078 510
1078 28,793 540

I need SSMviaCAN as fast as K-Line logging.. :(
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Re: Subaru CAN Fast in V1.44

Postby Alizar » Mon Jan 28, 2013 7:57 pm

I don't see any option to apply the patch to my ROM. I have an 08 Forester with CAN - is my ECU (4E12584107) not supported with the patch, or am I missing something?

I am running V1.44.3721
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Re: Subaru CAN Fast in V1.44

Postby Jochen_145 » Sun Feb 03, 2013 10:28 am

MY2008 got SSM-II via K-line, so fast-poll will provide fast logging via k-line.

IMO no need to implementate CAN-patch, because it will not be faster
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Re: Subaru CAN Fast in V1.44

Postby Jochen_145 » Sun Mar 17, 2013 1:55 am

Witch way CAN-logging is implementated ?

Maybe SSMviaCaN (SSM-III) is running in polling-mode and needs to be switch to free-running to increase the sampling rate of the measurement values, like fast-poll on k-line SSM-II will do ?
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Re: Subaru CAN Fast in V1.44

Postby Jochen_145 » Thu Apr 11, 2013 12:23 am

It will ..

see this threat in RomRaider Forum

Maybe a extension for the stand-alone logger in one of the next releases ?

Jochen
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