Electromechanical

Technology Trend - eSteering Enables Greener Buses and Coaches

Technology Trend - eSteering Enables Greener Buses and Coaches-GettyImages-486964652 Bus Shanghai Financial District-Electromechanical and Drives Division Europe-Automation Group-Parker Hannifin CorporationThe world is quickly moving towards more hybrid and electric vehicles, which reduce toxic emissions. This trend is leading to an overall improvement in the quality of the air we breathe, especially in congested inner city locations. During this evolution, bus and coach manufacturers can get ahead by taking advantage of the latest electro-hydraulic steering systems to reduce the size of their internal combustion engine (ICE).

Replacing hydraulic variable displacement pumps with more efficient electrically-driven systems allows ICE downsizing and emission reductions to begin.

A brief history of power steering systems

The first power steering systems for buses and coaches were designed with a variable displacement hydraulic pump, which was driven by a belt connected to the ICE. Originally, the required size of the ICE was dependent upon the amount of power needed to propel the bus or coach as well as the additional auxiliary power needed for hydraulic and pneumatic functions. As these gave way to the power take-off (PTO) system—and then the electric generator powered by the ICE—steering systems slowly began to become more efficient and engines could get smaller.

The electro-hydraulic steering pump

The most recent iteration of power steering systems is an electric generator driven by the ICE with an electro-hydraulic pump for the steering function. A new range of permanent magnet AC (PMAC) motors dedicated to mobile applications are currently the most efficient available on the market, and this efficiency level combined a smaller motor size allows it to be installed at the front of the bus, improving system efficiency further by shortening hydraulic connections from pump to steering box.

Future trends

These systems will continue to improve as time goes by. Designing a more ergonomic system to provide the hydraulic power for steering is one direction for future development by OEMs. The introduction of electro-hydraulic pumps is a first step in the vehicle hybridization process that will one day lead to complete electrification for transport systems in large cities.

By understanding that each vehicle electrification application has its own unique requirements, we can support your vehicle development by delivering high performance solutions in electro-hydrostatic systems, electric and hybrid drivetrain systems and auxiliary vehicle systems.

Learn more

Download our white paper to discover the four steps to improving operational efficiency on bus and coach applications

Technology Trend - Bruno Jouffrey-Electromechanical and Drives Division Europe-Automation Group-Parker Hannifin CorporationArticle contributed by Bruno Jouffrey, market development manager - mobile, Electromechanical and Drives Division Europe, Parker Hannifin Corporation.

 

 

 

 

Related content

The Hydraulic Solution for the Evolution of Electric Drives

Series Hybrid Vehicle System Design

Series Hybrid Vehicle Electrical Systems

Hydraulic Hybrid Fleet Approaches One Million Miles of Operation

 

Categories
Recent Posts by Author

You Don’t Need a Cloud for IIoT! Just a Centralized Control Scheme

Centralized machine control is more than a control architectural scheme, it’s the first step to enabling Industrial Internet of Things (IIoT). The Parker Automation Controller (PAC) provides...

Overcoming Motor Inertia - The Five Things You Need to Know

Most engineers recognize that gearheads can be used to create a better inertia match between the object that is being moved and the motor being driven. Put simply, it is dictated by the gearhead ratio...

Can Lighter, Greener Heavy-Duty Trucks Become a Reality?

Today, virtually everything we buy has at some point been on a commercial freight truck, traversing countries and even continents to reach us, the consumer. Commercial vehicle manufacturers are...
Comments

Comments for Technology Trend - eSteering Enables Greener Buses and Coaches


Please note that, in an effort to combat spam, comments with hyperlinks will not be published.

Leave a comment





Captcha