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DEVICE FOR OPERATING AN AIR SUSPENSION LEVEL SYSTEM IN A VEHICLE

IP.com Disclosure Number: IPCOM000232397D
Publication Date: 2013-Nov-06
Document File: 3 page(s) / 82K

Publishing Venue

The IP.com Prior Art Database

Abstract

A device for operating an air suspension level system where all functions provided by the air suspension level system can be operated from a single device. This makes the operation of the air suspension level system easy, and particularly for operating between modes related to axle load distribution.

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device for operating an air suspension level system in a vehicle

The present invention relates to a device for operating an air suspension level system in a vehicle. With a device for operating an air suspension level system, all functions provided by the air suspension level system can be operated from a single device, which makes the operation of the air suspension level system easy, and particularly for operating between modes related to axle load distribution.

Air suspension level systems are commonly used in heavy motor vehicles, such as trucks, for controlling the chassis height level, e.g. when loading or unloading cargo. The air suspension level system can also be used for controlling load distribution between bogie axles , raising/lowering tag axle(s) of the vehicle etc. Hence, the air suspension level system provides a number of functions related to height, load and drive configuration of the air suspension of the heavy motor vehicle.

Usually, the air suspension level system is operated by means of separate buttons arbitrarily mounted on a panel in a cabin of a motor vehicle. Each button corresponds to a function of the air suspension level system, and hence a large number of buttons are arranged on the panel. Also some parameter settings have to be performed to change type of function on the specific buttons at a service workshop.

For vehicles with air suspension on more than one rear axle, the axle load distribution is distributed between the axles using a pressure distribution.

Today there are two kinds of the pressure distribution:

- fixed pressure distribution, which means that the distribution, in percentage terms, is always the same between the axles; and

- flexible pressure distribution, which means that the driving axle always takes up all loads up to the limit of their maximum load.

The air suspension system also has a function, load transfer,  which is independent of the normal pressure distribution. By enabling this feature, the driver makes an active choice to deviate from the normal distribution of pressure and hence maximizes the axle load on the driving axle.

Today there are two types of load transfer functions:

- A load transfer function which is restricted by a legal requirement.  This means that loads up to 130% of the allowed axle pressure is transferre...