PicoScope 7 Automotive
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Solenoid Valve Testing - Guided Test
Solenoid Valve Testing - Guided Test
Hi all,
Using the guided test notes, I have been testing a turbocharger pressure solenoid valve and an EGR solenoid valve on a PSA 2.0HDi engine.
The guided notes suggest 3.75kHz and 3 waveforms within 0.8 seconds.
The ones I am testing are giving around 140kHz and 27-29 waveforms per 200ms!
The test was conducted at idle predominantly. Revving the engine caused only very slight variations if any.
Surely some variation should be noted with a load applied albeit only revving and not road test as suggested?
First picture is the turbo pressure solenoid valve.
Second picture is the EGR solenoid valve.
Using the guided test notes, I have been testing a turbocharger pressure solenoid valve and an EGR solenoid valve on a PSA 2.0HDi engine.
The guided notes suggest 3.75kHz and 3 waveforms within 0.8 seconds.
The ones I am testing are giving around 140kHz and 27-29 waveforms per 200ms!
The test was conducted at idle predominantly. Revving the engine caused only very slight variations if any.
Surely some variation should be noted with a load applied albeit only revving and not road test as suggested?
First picture is the turbo pressure solenoid valve.
Second picture is the EGR solenoid valve.
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Steve Smith
- Pico Staff Member
- Posts: 1588
- Joined: Sun Aug 25, 2013 7:22 am
Re: Solenoid Valve Testing - Guided Test
Hello and thank you for the post.
Please remember the Guided Tests and notes are “typical examples” and most certainly not model specific.
The great news is that you have captured the data to enable analysis and the Guided Tests have assisted you here
To enable you to view changes relative to load or engine running conditions, you could increase your time base to perhaps 200 ms/div.
Here you will be able to free rev the engine, pause the scope & zoom to capture changes in duty or frequency on a single waveform buffer.
When using "Measurements", try "Between the Rulers" to display values such as frequency and duty between the time rulers at various points about the waveform
Better still you could add a duty or frequency math channel to graph those changes
The following links will help
topic10051.html
https://www.picoauto.com/library/traini ... duty-cycle
Please don’t be surprised to see little change in duty for boost pressure control when free revving from idle (Stationary vehicle) The EGR however should show a change in duty if the engine temperature is above the relevant threshold.
Road testing will most certainly bring about activity from both components.
If road testing, include gas pedal position as one of your channels as here you will capture “driver intention” which helps during analysis
Here is one such example viewtopic.php?p=100270#p100270
I hope this helps, take care……Steve
Please remember the Guided Tests and notes are “typical examples” and most certainly not model specific.
The great news is that you have captured the data to enable analysis and the Guided Tests have assisted you here
To enable you to view changes relative to load or engine running conditions, you could increase your time base to perhaps 200 ms/div.
Here you will be able to free rev the engine, pause the scope & zoom to capture changes in duty or frequency on a single waveform buffer.
When using "Measurements", try "Between the Rulers" to display values such as frequency and duty between the time rulers at various points about the waveform
Better still you could add a duty or frequency math channel to graph those changes
The following links will help
topic10051.html
https://www.picoauto.com/library/traini ... duty-cycle
Please don’t be surprised to see little change in duty for boost pressure control when free revving from idle (Stationary vehicle) The EGR however should show a change in duty if the engine temperature is above the relevant threshold.
Road testing will most certainly bring about activity from both components.
If road testing, include gas pedal position as one of your channels as here you will capture “driver intention” which helps during analysis
Here is one such example viewtopic.php?p=100270#p100270
I hope this helps, take care……Steve