Search found 39 matches

by eric989
Wed Jan 31, 2018 9:17 am
Forum: Diagnostic discussion
Topic: Odd COP secondary ignition waveform
Replies: 4
Views: 1012

Re: Odd COP secondary ignition waveform

Hi Ben,

You are right. Yes, we need to invert the waveform. I was misunderstood by the user before. Here I got the psdata from him. The waveform looks normal. Thanks.

And thank you Liviu2004.

Eric
Inverted.png
by eric989
Mon Jan 29, 2018 7:13 am
Forum: Diagnostic discussion
Topic: Odd COP secondary ignition waveform
Replies: 4
Views: 1012

Odd COP secondary ignition waveform

Hi,

Can somebody comment the waveform below? It looked very odd, the Dwell Period is Positive and the Burn Time is Negetive. It's from a Hyundai Sonata, the waveform from all 4 cylinders are same, and the vechicle vibrates at idle.

Thanks,
Eric
1.jpg
by eric989
Fri May 20, 2016 7:16 am
Forum: PicoDiagnostics NVH
Topic: Tire correction factor.. What is this??
Replies: 4
Views: 8034

Re: Tire correction factor.. What is this??

Thank you Steve. I asked the question before, and only knew the Tyre correction factor related to pressure,ware etc.. Now, I know how to calculate it. :D Did you have a typo here: ODB/Tyre Circumference method 11.34 Hz Engine RPM/Transmission Ratio method 11.90 Hz Apply Tyre correction factor to the...
by eric989
Thu Apr 28, 2016 1:11 am
Forum: PicoDiagnostics NVH
Topic: Can singel axis NVH convert to 4 axis NVH
Replies: 2
Views: 1511

Re: Can singel axis NVH convert to 4 axis NVH

Hi Chris,

Understood it. It's better to have 2 separate 3 axis output interfaces for "4 axis kit". Thank you for the detailed reply.

Eric
by eric989
Thu Apr 21, 2016 9:11 am
Forum: PicoDiagnostics NVH
Topic: New features of Beta NVH software
Replies: 11
Views: 5682

Re: New features of Beta NVH software

The TA149 interface have 3 output to Scope. Which output should be connected to scope when using multiple sensors mode selected microphone? I thougt any output should be ok, and the signal from the 3 output would be same. Right?

Thank you, Steve.

Eric Chen
by eric989
Thu Apr 21, 2016 8:45 am
Forum: PicoDiagnostics NVH
Topic: Can singel axis NVH convert to 4 axis NVH
Replies: 2
Views: 1511

Can singel axis NVH convert to 4 axis NVH

For the singel axis NVH (PP858) users, Can they just buy a 3 axis NVH(PP986) to combine with the PP858, then they can have a 4 axis kit?

Thank you.
Eric Chen
by eric989
Mon Mar 14, 2016 10:39 am
Forum: Diagnostic discussion
Topic: question for direct injection current waveform
Replies: 5
Views: 1934

question for direct injection current waveform

Hi all, Can direct injection current waveform tell the time of pintle lifts off its seat? There is no obvious hump point on the current waveform like the injector located on inlet manifold. The file I downloaded from waveform library. I can tell the injector closed time, Can somebody tell the start ...
by eric989
Wed Feb 17, 2016 6:40 am
Forum: PicoScope 6 Automotive software
Topic: reference waveform feature
Replies: 4
Views: 3158

Re: reference waveform feature

Hi FF,

Great, many thanks. I never noticed there is a delay option for the reference waveform before.
Cheers,

Eric
by eric989
Tue Feb 16, 2016 6:17 am
Forum: PicoScope 6 Automotive software
Topic: reference waveform feature
Replies: 4
Views: 3158

reference waveform feature

Hi Steve, Hare are you? I read your cases studies, several times I saw you overlaid the reference waveform perfectly. How can you achieve that? Take the follow image for example, I mean how can you make the 4 TDCs in one vertical line? I noted the Trigger set as None. When I use the reference wavefo...
by eric989
Fri Dec 18, 2015 2:30 am
Forum: Diagnostic discussion
Topic: Crankcase waveform analysis
Replies: 3
Views: 1496

Re: Crankcase waveform analysis

Hi Steve, Many thanks for your reply. This engine burned oil, consuming 1.5L oil for about 1000km. Disassembled the engine and found carbon deposition in cyl 2 and 3 because of their worn piston rings.So it can answer why the pulsations of cyl 2 and 3 on the power stroke are weaker than the other tw...