AUSV 2520 - On-Off and Pulse-Width Modulated Solenoids
This video is intended for students in the online AUSV 2520 Automatic Transmissions class at Weber State University in Ogden, Utah. This class is normally taught face-to-face, but due to the COVID-19 Pandemic, I am attempting to offer the class material online. Suggested quiz questions are shown below the video timeline. You should have watched the following Clutches, Bands, and One Way Devices video first • AUSV 2520 - Clutches, ...
The tool used in the video is part number J-44246, it is available from GM Tools at gmtoolsandequipment.com
The audio quality is not as good as I would have desired, but the school is on lockdown because of COVID-19 now and I cannot reshoot this video.
TIMELINE:
0:00 Introduction
0:10 On-Off Solenoid Introduction
0:23 The three different ways a solenoid must function
1:16 Electrical operation
1:55 Special service tool demonstration of mechanical and hydraulic operation
4:10 The two main computer inputs for solenoid control
4:54 A properly functioning solenoid
5:40 A solenoid with a hydraulic failure
6:30 A solenoid with an electrical failure
7:54 Pulse-Width Modulated (PWM) solenoid variable fluid pressure
8:29 Duty-cycle of PWM solenoid
9:00 Shift quality control
All Solenoids must work three different ways:
1. Electrically - Electrical current is run through a copper coil of wire creating a strong electromagnetic field. This magnetic field pushes or pulls on a spring-loaded plunger inside the solenoid
2. Mechanically - A spring-loaded plunger inside the solenoid is used to seat a metering ball or valve to block the flow of fluid.
3. Hydraulically - A metering ball or valve is used to block the flow of fluid. Fluid pressure increases when the ball is seated and decreases when the ball is unseated.
On-Off solenoids are used to allow fluid flow or block fluid flow but have no ability to create a variable fluid flow (variable fluid pressure). Pulse-Width Modulated (PWM) solenoids are used to create a variable fluid flow (variable fluid pressure). This is used to control fluid pressures, shift feel or shift quality, and control the slip rate of the torque converter clutch and other clutches inside an automatic transmission.
Questions for Teachers:
1. What are the three different ways a transmission solenoid must work?
2. Give an example of what an on-off solenoid is used for in an automatic transmission?
3. What does the solenoid click test indicate about the condition of the solenoid?
4. Can a solenoid pass the "click test", but still not operate properly?
5. According to the cutaway of an on-off solenoid view in the video, does the fluid exhaust when the solenoid is on or off?
6. Why are Pulse-Width Modulated (PWM) solenoids used in automatic transmissions?
7. What advantage does a PWM solenoid have over an On-Off solenoid?
8. How do PWM solenoids create a variable fluid pressure?
9. According to the graphs in the video, what does a 40 percent duty-cycle mean?
10. According to the graphs in the video, does zero amps of current equal a high or low fluid control pressure?
11. Tell me one thing you learned or found interesting in this assignment?
ABOUT US:
Weber State University (WSU) - Automotive Technology Department - Automatic Transmission Lab. A technical discussion of On-Off and Pulse-Width Modulated Solenoids in an automatic transmission. This video covers the basic operation and function of On-Off and Pulse-Width Modulated Solenoids in automatic transmissions. We teach current vehicle technologies to our automotive students at Weber State University and online. For more information visit: www.weber.edu/automotive
This video was created and edited by John D. Kelly at WSU. For a full biography, see www.weber.edu/automotive/J_Kel...
Visit my other youtube channel / vibratesoftware to see the amazing NVH app for vibration diagnosis!
DONATE TO OUR DEPARTMENT
Please consider a donation to the Department of Automotive Technology at Weber State University here: advancement.weber.edu/Automotive
Пікірлер: 53
Good to have a proper professional description of the various seals from a qualified engineer. Thank you very much professor, it's much appreciated.
@WeberAuto
4 жыл бұрын
Thank you
I'm hooked on this channel, thanks to you Professor Kelly
Awesome information Professor! I really like solenoids and electronic control , it makes understanding of control of Auto-transmissions much more easier , than governor assembly - throttle valve used in older transmissions. Мuch obliged for doing these educational videos !
@WeberAuto
4 жыл бұрын
Thank you!
Need more KZreadrs like you!
@WeberAuto
4 жыл бұрын
Thank you
You should be charging money for these videos! Great principles being applied. I have been watching your transmission series trying to prepare for the A2 exam.
Great teacher - makes concept so clear.... god bless.
@WeberAuto
3 жыл бұрын
Thank you kindly!
Sir , You post videos after a long time . I always wait for your documentation
@WeberAuto
4 жыл бұрын
Thank you
Another great video, from a great teacher!
@WeberAuto
2 жыл бұрын
Thanks again! Thanks for watching
Thanks for sharing... Cheers.
World-class video.
@WeberAuto
4 жыл бұрын
Thank you
I love this job!
@WeberAuto
3 жыл бұрын
Thank you
@Ademann
3 жыл бұрын
@@WeberAuto I have to thank you because I repaired automatic transmissions for several years sitting in a wheelchair and if there weren't any personal reasons I would have done this job until today. In the end, I specialized in valve body diagnostics and repairs! I love this technic!
This channel is gold, thanks for your work. Any chance of of Twizy EV transmission and battery video ?
@PeakCivilization
2 жыл бұрын
@WeberAuto, any chance ? :)
I'd like to see the PWM solenoid in action also. Especially for the lockup converter clutch.
@WeberAuto
4 жыл бұрын
Thank you, it is on my list
Hello professor. thank you for your great educational videos. I have a question about my 2010 ford expedition. When the car comes to a full stop second before stopping sometimes it jerks like a hiccough, and right after stopping it clicks. Sometimes hursh, sometimes soft. Sometimes it only clicks, or it only jerks. It may not do anything for a while, then comes back again on and off. On reverse if I don't wait for a few seconds and push the accelerator pedal, it bangs. Or from almost stopping I accelerate sometimes it will click. Otherwise during the drive all gears shift good. Different technicians told me different things "1.Speed sensor 2.Solenoid 3.TCM update, Flash PCM, ECM, Erase clear the Adaptive tables" so on and so forth. In 2021 I changed the transmission fluid and then again in january 2022 with gasket and filter each time, but nothing changed. If I can have your opinion on this matter I will appreciate. thank you again. God bless.
Nice video sir
My transmission is a 1986 Toyota pick up no identification on the transmission but I gotta stick her on the door and does it show that
Thanks very interesting
@WeberAuto
4 жыл бұрын
Thank you
Hi sir, i have a question. I learned a lot from your video's. I have a volvo v70 with an aisin Warner 55-50sn and i was driving normally, no issues before that, and suddenly the gear goes into nutral. DPRN doesnt work anymore and no faultcodes. What could it be?
@cck0728
Жыл бұрын
It could be a selector issue? What was the problem? Thanks.
love this video. would like to get a tool, found it online but it doesn't come with the quick "connect valves??) to connect to shop air. did you just get these separately?
@WeberAuto
3 жыл бұрын
Yes, I bought them at Home Depot
Proffesor why do you think they dont use solenoids to open and close the valve train on acombustion engine . Thank you really enjoy your presentations
@WeberAuto
4 жыл бұрын
Thank you. Long-term reliability
Could you listen for a variation of air pressure to test a PWM solenoid?
@WeberAuto
4 жыл бұрын
I was planning on that, but they wont let me back in my shop until the COVID-19 Pandemic is over in our area. I am trying to figure out a way to do it from home.
I look forward to a video demonstration of that 10 speed in the background
@WeberAuto
4 жыл бұрын
Thank you, it is coming
I would love to see a more detailed description of how the the PWM solenoids work.
@WeberAuto
4 жыл бұрын
Thanks, it is on my list
@everythingisnothing7905
4 жыл бұрын
Good
@FirstLast-tx3yj
2 жыл бұрын
@@WeberAuto the pwm solenoids are the ones that control the clutches in zf8hp?? So in the case of zf8hp it has 3states fully open half closed and fully closed and this gives sevral gear ratios for the same planetary gear set? Or is it a smooth transition between open and closed??
@WeberAuto
2 жыл бұрын
@@FirstLast-tx3yj It is a smooth transition between closed and open.
Hi I was wondering if you could please help I am doing a degree in automotive engineering I was wondering if you have any lectures on battery arrangement on how to get range and what the formula for working out power I am doing a major project on electric vehicles if you could help I would really appreciate it thanks
Could I use ohm meter to test resistance on the terminal?
@WeberAuto
4 жыл бұрын
Yes, that would check the solenoid coil resistance
I would love to see the solenoids operate electrically on a scope, please.
also noticed you using clips instead where did you get those
@WeberAuto
3 жыл бұрын
The clips are from the valve body where the solenoids were clipped in place there
SIR I like your channel im from Saudi Arabia we need moor information about 10 speed trans thinks شكرا لك على هذه المعلومات
@WeberAuto
4 жыл бұрын
Thank you. I will provide 10 speed information later this year.