How Electric Power Steering Works

Here's a detailed look inside the electric power steering (EPS) system in your car and how it works!

In this video, an EPS rack and pinion is cut apart to show how each individual component works. The steering column takes input from the driver at the steering wheel and inputs it to the torque sensor. The torque sensor, sends a signal out to the EPS computer to power up the electric motor using MOSFETs, based on the amount of assist required. The pinion gear turns the rack, with the electric motor rotating about the rack via a recirculating ball system, providing assist.

The vehicle in this video is a 2005 Honda Accord Hybrid.

For more information on how hydraulic steering racks work, check out this video here:

Here's how a steering rack works:

Here's how to replace a tie rod:

Skip to section in the video:
0:00 Introduction
1:41 Torque Sensor
5:35 Steering Motor
10:19 Conclusion

This is the Camera I use:

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[benjaminsmith]

Sheesh, everything from a full mechanical disassembly to a complete view of the underlying electronics. Thanks again for a great video!

[Builtit]

I love this guy because he puts work into his explanations.
Also his nonchalant jokes about his brothers hat or toothbrush.
Very underrated

[amdstrollo]

"So I'm going to use my special security bit to take these off..." *Angle grinder fires up*

[keithcurtis]

Just wanted to drop a thank you. You give the absolute best expalination of how systems work, with a great addition of humor and quirkiness!

[staterafukumoto]

thank you for creating educational content that’s very approachable and beginner-friendly, while also not feeling condescending. as a car enthusiast who is in no way a mechanic; i appreciate you.

[Miata]

Rapid fire details. I love it.
Everything I ever learned about how things work has come from taking things apart. The best way to learn.

[toyorobo]

This guy is amazing! Also, I've started using a toothbrush to point to everything while I teach. It's been very effective.

[joemikos]

You are amongst the very best few automotive video producers on You Tube.
My guess is you have an engineering background as well as being a mechanic.
I am grateful for the time you put into these educational videos.

[irvinslagter]

This explanation is really good, but think of how talented the people were that designed that steering and made it work flawlessly. Kudos to them and their ingenuity.

[rocki_bb]

I'm kind of a tinkerer. There are multiple projects I've wanted to make that have been beyond my price range due to the cost of parts. Yesterday it occurred to me to see if I could use parts from junked cars. You helped me see it's totally possible. Thank you!

[mikechiodetti]

My 2020 RAV4 has this electric assist. I really like it! So smooth, center's real well, no pump, hoses, fluid and valves in the rack. Oh ya, no pump whine at full turn lock!
Thank you for this video!

[MrWoody]

And now I put it back video, great explanations.

[scdevon]

I feel like I've been to college on EPS in 10 minutes. Thanks!

[ChiliStyles]

#3. Cut off wheel is such a wonderful tool.

[jamesking]

You are a very good teacher straight talking and no if and but could listen to you all day thanks

[torizaemon]

I wish all tech. videos were as clear and fast and accurate as yours is. Well done.

[fxworld]

You seriously deserve more subscribers, great job as always

[TEKMOTION]

Bravo ! Very well done. I thought I had seen enough steering box's to last a life time. I was wrong.

[barjan]

I'm working in the automotive industry, especially in the EPS electronics R&D field. The way you opened the PCB at 9:25 simply brought tears to my eyes 😂😂😂😂😂

[bumpstart]

Thanks for taking time to dissect the system for everyone. Looking at the substantial motor armature I see why this system tends to damp rack movement. Good for passenger cars and trucks.