What is an automated manual transmission in a semi-truck?

Estimated reading time: 4 minutes

Schneider began testing a variety of automated manual transmission (AMT) semi-trucks all the way back in 2007 and started transitioning our fleet from manual to AMT tractors in 2015.

Now, 100% of Schneider semi-trucks are equipped with AMTs instead of manual transmissions, providing a safer and more comfortable experience for drivers.

But what is an automated manual transmission and what are the benefits of driving AMT semi-trucks? Keep reading to find out.

What is an automated manual transmission?

An automated manual transmission (AMT) is a manual transmission system that uses a combination of software and hydraulics to automate the gear-shifting process. Unlike a manual transmission truck that requires the driver to constantly engage the clutch to initiate gear changes, an AMT handles the shifting process for them.

What is the difference between manual transmission and automated manual transmission?

While AMTs might seem similar to manual transmissions, they operate differently. Here’s a quick comparison:

Automated manual transmission

• Gear shifting: AMTs automate gear changes using computer software and hydraulic systems.
• Pedals: Only two pedals are needed (accelerator and brake), similar to a non-commercial vehicle.
• Driver input: Automated shifting reduces the physical strain on drivers.

Manual transmission

• Gear shifting: Drivers manually shift gears using a gear shifter and clutch pedal.
• Pedals: Requires three pedals (accelerator, brake, clutch).
• Driver input: Manual shifting requires a lot of driver effort, especially in stop-and-go traffic and on steep inclines.

Benefits of automated manual transmission semi-trucks

Here are some of the reasons many drivers prefer AMT semi-trucks to manual transmission trucks:

1. Improved driver safety.

Manual transmission semi-trucks require drivers to multi-task while driving. Using one hand to shift gears can cause drivers’ attention to shift away from the road ahead. With AMT, drivers no longer need to manually shift gears, allowing them to keep both hands on the wheel and focus fully on the road.

AMTs can also handle downshifts for extra jake brake power as needed. With extra jake brake power, AMT drivers are better able to keep their service brakes operating at the maximum stopping potential.

Schneider’s number one priority is driver safety. Increasing drivers’ braking abilities and focus are great ways to keep everyone safe on the road.

2. Enhanced ease of operation.

Gone are the days of worrying about missing or grinding gears. With an automated manual transmission, your truck will do the work for you. AMT semi-trucks detect what gear they should be in and automatically shifts gears.

This saves time by eliminating the need to manually change gears and helps drivers in conditions that were traditionally tough to navigate in a fully manual truck, such as:

• Steep road gradients: AMT has “hill descent mode” that gives the driver better control when descending long, steep grades.
• City driving: AMT provides a much smoother experience in start-and-stop traffic conditions, such as when driving through large cities.

3. More driver comfort.

One of the biggest reasons drivers enjoy operating AMT trucks is that they are physically easier to drive than manual transmission semi-trucks.

Most drivers who transition from manual to AMT experience relief in their back and knee because they no longer have to actively engage the clutch every time they change gears. Drivers also say they prefer to drive AMT trucks because they offer a smoother or less jerky ride than a manual transmission vehicle.

4. Increased fuel efficiency.

AMT semi-trucks not only improve the consistency of fuel economy but also improve overall fuel efficiency. This is because AMT semi-trucks rely on computers and electronics to change gears instead of the driver.

This means the truck ensures the automated transmission is always in the proper operating range for the engine. Improved fuel efficiency also helps reduce carbon emissions, helping promote a more sustainable transportation industry.

Why drivers prefer AMT semi-trucks

Hear from Schneider drivers how operating AMT semi-trucks improves their driving experience: