Device for charging a truck pneumatic system

Pumps – Motor driven – Internal-combustion engine

Patent

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Details

60609, F02B 3704, F04B 1705

Patent

active

059064803

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a device in a motor vehicle with an internal combustion engine supercharged by a compressor and with a compressed air system comprising an air-compressor.
Todays trucks are often provided with different types of auxiliary systems to assist the driver and to make his work-place more comfortable. One of these auxiliary systems consists of an air-compressor which is designed to provide the truck pneumatic brake system, for example, with sufficient compressed air. Technical developments have brought forth more and more possibilities for utilizing compressed air for various purposes, which were not originally intended, such as air spring systems or suspension-level control both for transport/driving and unloading and loading purposes, both for the tractor and trailer. Increasing insight into the utility and use of compressed air has accompanied the increase in the capacity or available volume per unit of time for compressed air systems. To a certain extent, the problem which this has posed has been solvable by using more or larger tanks, which are mounted on the truck frame. Such tanks, however, take up a large amount of space and increase the weight of the vehicle, not to mention being costly. Increasing demands on the transport economy, load capacity and equipment packing, at the same time as there has been an increased need for compressed air, it has not been possible to increase pump capacity for reasons of both cost and space, particularly since high capacity is generally required at low engine rpm and with the truck standing still. The volume of compressed air which is possible to store in the tanks is seldom sufficient.
It is previously known to draw off combustion air from turbo-compressors to precharge compressed-air compressors. In such systems it has, however, proved difficult to achieve sufficient precharging pressure from the turbocompressor at low rpm, and thus there will be only a marginal contribution from precharging. All of these known systems thus function best at high engine rpm and high load.
The purpose of the present invention is to achieve a device of the type described by way of introduction which provides more effective precharging of the air-compressor at low engine rpm than what has been achieved in systems known up to now.
This is achieved according to the invention by virtue of the fact that the compressor for supercharging the engine is mechanically driven and its pressure side is connectable via valve means to the suction side of the compressor for compressed air.
A great advantage of the invention is that in vehicles with air springs and in which it is possible to regulate the chassis to adapt it to different heights of loading docks, for example, it is possible for the driver, without delay, to raise the chassis/suspension of the unit immediately after starting the engine at low engine rpm and load.
Another advantage of the invention is that the installation can be completed when the engine is manufactured. This is possible by virtue of the fact that only one extra line needs to be drawn for system compressor air. One less airfilter is required since the system compressor air can always be drawn via a "clean" air line with the device according to the invention.
An additional advantage of the invention is that otherwise normally occurring unintentional introduction of oil into the pneumatic compressor can be minimized with a device according to the invention, because the pneumatic compressor can be continuously held under overpressure.
The invention with control equipment will be described in more detail below with reference to the accompanying FIGURE, which shows a preferred embodiment of the device according to the invention, applied to an engine with both a mechanical supercharger and a turbocharger.
In the FIG., 1 designates a four-stroke internal combustion engine of diesel type, 2 designates the intake line to the engine and 3 the exhaust line. A turbosystem comprising a turbine 4 and a turbocompressor 5 is connected in a conventional manne

REFERENCES:
patent: 2350896 (1944-06-01), Jde
patent: 2489540 (1949-11-01), Priess
patent: 3204859 (1965-09-01), Crooks

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