“The ease of operation allows the drivers to concentrate on driving not shifting.”
A Fleet Owner
Fleets should expect to see improved fuel economy from automatic transmissions, which have full power shifts and a torque converter to seamlessly transition between gears. They are most valuable in city driving where a significant amount of shifting is required.
Improved driver recruitment and retention are big factors behind many fleet owners’ decision to specify these transmissions over manual transmissions. In addition, they reduce the variability in fuel economy from one driver to the next.
Although it is too early to predict the payback for automatic transmissions, their business case is expected to be strong over time.
Note: All benefits and consequences are the same for automated manual transmissions (AMTs) and automatic transmissions except for the fuel economy performance. AMTs offer 1-3% fuel economy improvements and enable even higher levels of performance in future with features such as downspeeding, and the use of GPS to better manage hills and valleys. Fuel savings from automatic transmissions are yet to be determined.
Industry studies show that a driver can affect a truck’s fuel efficiency by 30%. Automatic transmissions take the driver out of the shifting decision-making process and allow technology to determine the proper time to shift gears.
Many driver recruits have no experience operating vehicles with manual transmissions. Specifying trucks with automatic transmissions enlarges the driver pool, which is a key advantage given the current driver shortage. Since these transmissions make the trucks easier to drive, drivers will be less tired at the end of the day, which should help fleets with driver retention.
Since drivers are already familiar with automatic transmissions, driver-training time will be shortened and the driver will be able to start working more quickly.
Automatic transmissions decrease the variability in the fuel economy of trucks or drivers in a fleet, compared to the variability in fleets using manual transmission. Electronically controlled transmissions make poor drivers much better, average drivers better and good drivers slightly better.
Electronically controlled transmissions improve driver safety because they allow the driver to concentrate on the road ahead rather than having to worry about shifting. The driver can keep both hands on the wheel.
Electronically controlled engines, transmissions, and other powertrain components offer the opportunity for improved and fine-tuned performance for various duty cycles and terrains.
Automatic transmissions are estimated to cost more than automated manuals, but market cost data is not yet available because the product used in Class 8 applications has not been on the market long enough.
Expectations are that residual values will be on a par with trucks equipped with manual transmissions.
Electronically controlled transmissions have more moving parts and require software to operate. As a result, fleets can expect a small increase in maintenance cost.
To get the most from electronically controlled transmissions, care needs to be taken in the specification of the engine, transmission, axle, tires, and road speed combination of the entire vehicle.
Fleets are increasingly investing in electronically controlled transmission. Many fleets have said that going forward all of their vehicles will be spec’ed with electronically controlled transmissions. Fleets have indicated these transmissions improve fuel economy but also help with driver recruitment and retention efforts. Fleet owners believe spec’ing electronically controlled transmissions makes them more attractive to younger drivers who have no experience driving standard transmissions. Learnings from automated manual transmissions show that use of electronically controlled transmissions can be touted in recruitment efforts, and can improve the driving experience.
Executives from 19 large fleets were personally interviewed to find out about their experience with electronically controlled transmissions.
- All of the fleets had experience with automated manual transmissions, but very few with automatics.
- The fleets unanimously said that while at first their drivers did not like the automated manual transmissions, they later agreed that the technology has a positive impact on their work life.
- Fleets were unanimous in the fact that they would try automated manual transmissions in the future. Many mentioned that automated manual transmissions are the choice for the future.
Michelin Fleet Forum
In conjunction with Michelin, the study team surveyed 200+ members of Michelin’s Fleet Forum about their opinions of electronically controlled transmissions.
- According to one survey respondent, “[They provide] better efficiency and drivers actually like them better after they get used to them.”
- “I like the idea of assisting newer and older drivers by removing the manual gearbox and clutch pedal,” said one survey respondent. “Additionally, if the claims of increased fuel mileage are correct, it’s worth investigating, since it would be easier to buy this equipment than try to force drivers to modify their driving habits.”
The study team developed several tools to help fleets in making their decision about electronically controlled transmissions.
Currently one supplier makes automatic transmissions.
After 25 years of development globally, electronically controlled transmissions are: