At the IAA Commercial Vehicle Show (Hall 25, Stand C50), Gardner Denver Transport is concentrating on innovative solutions for equipping local transport and commercial vehicles with auxiliary units. Overall, electric drives must be designed to be as effective as possible for use in (partially) electrified drive systems. Here, the compressed air supply for door openers on city buses is just as much a focal point as the use of electrically-driven power steering pumps, for example. The efficiency of the entire system thereby depends on the interaction between the on-board technology and on-board electronics. Undesired effects during later use which are caused by inadequate interface of the subsystems must be prevented.
This is where the Gardner Denver exhibition programme excels, with its core product, the new Hydrovane T02 transit module (figure 1) for compressed air generation. This rotary vane compressor module was specially developed to provide maximum space savings and weight reduction along with the lowest noise possible while ensuring maximum energy efficiency. The technical data is ground breaking: direct drive by means of a 400V AC IEC E-motor in a speed range of 800 to 3000 rpm. With a maximum pressure rating of 13Bar, an air volume flow of 6.7l/min is possible; the power consumption is 1.1. to 4.0 kW. In comparison to the previous compressor stages, this new development achieves double the volume flow and a 30% higher pressure level.
For use in the demanding environment in which local buses operate, rotary vane compression has proved to be an ideal principle for compressed air generation, which surpasses the piston compressors with its quiet vibration- and pulsation-free operation, compact design and low maintenance requirements.
Not only are many of the compressors on the market today still too loud and/or too heavy, they also require extensive cooling equipment. This means additional costs during installation and during vehicle operation.
But there is another way, as demonstrated by the extremely lightweight, compact Hydrovane T02 unit with integrated air dryer, AC electric motor and inverter technology, which is around 50% lighter than conventional DC units. Thanks to the water cooling, the unit can also be mounted in poorly ventilated, confined installation spaces in the vehicle. The inverter works with the Hydrovane Compressor Smart Protocol and precisely adjusts the rotary speed of the compressor to suit the compressed air requirement of the vehicle.
The T02 unit can be configured to suit customer requirements. For example, an air-cooled unit can also be configured with the same core components. This flexible, modular construction can be used in a huge range of vehicle types with different drive concepts and the easy integration of e-motors with even greater energy efficiency makes this compressor unit “future-proof”.
The Hydrovane T02 unit (figure 2) has a proven track record in the diesel-electric hybrid bus market. 3 years of series production manufacture has seen product running in London, Paris and Berlin with a number of other OEMs interested in using the product on their vehicles.
Gardner Denver also plays an active role in the EU Commission sponsored “Ecochamps” Project, which is aimed at creating an efficient, compact, low weight, robust and cost effective hybrid powertrain for both commercial vehicles and passenger cars. The T02 unit is an integral part of the new hybrid vehicle configuration.
Images: Gardner Denver Transport Solutions, Senden, Germany
About the Gardner Denver Industrials Group
The Gardner Denver Industrials Group provides a wide variety of compressed air and vacuum solutions. These cover a wide range of pump and compressor technologies for end and OEM customers around the world. The reliable and energy-efficient machines and systems are used in a variety of production and process applications and are designed to conserve resources through lower energy use and reduce emissions, with greater efficiency.
The varied range of products covers compressors for different systems for low to high pressure applications, as well as blowers and one of the largest pump ranges for vacuum and pressure. Customer-specific solutions are developed for all industries. This includes the steel and automotive industry, aircraft construction and medical technology, as well as the chemical, food and beverages industries, plastics and energy production. In the field of environmental technology, they are used for drinking water production, wastewater treatment, sewer cleaning and biogas production as well as recycling waste and reusable materials.
The product portfolio is complemented by an extensive range of global aftermarket services.
The Gardner Denver Industrials Group is part of Gardner Denver, Inc. The company's headquarters is located in Milwaukee, Wisconsin, USA. Gardner Denver was founded in 1859 and today it has around 7,000 employees in more than 30 countries. You can find out more at www.gardnerdenver.com/industrials