DE202016001308U1 - System for compression of combustion air for internal combustion engines - Google Patents

Abstract

System for intake and compression of combustion air for an internal combustion engine, characterized in that the compression of the combustion air is multi-stage and intercooled and completely outside the cylinder. For weight reasons, at least a multiple higher speed for the compressors, as provided in the internal combustion engine.

Description

FIELD OF THE INVENTION

The invention is a system for compressing combustion air from combustion air outside of a four-stroke internal combustion engine. More precisely, it is about a multi-stage compression with intermediate cooling of the air for the internal combustion engine. The energy either from the internal combustion engine (in mobile machines) or a power storage via an electric motor (stationary machines) is related. For example, in cars or trucks, the electric energy is used to drive the vehicle.

BACKGROUND OF THE INVENTION - PROBLEM TO BE SOLVED

Four-stroke internal combustion engines compress the combustion air in the cylinder via the piston. Even with a pre-compression via turbocharger, the piston compresses the combustion air in one operation to the necessary pressure.

The problem with this is that every compression process requires work, since one-stage takes a lot of power out of the internal combustion engine. For this purpose, the compression in the cylinder requires the use of mechanical valves which are driven by a camshaft. The valve drive via the camshaft increases the effort and weight of the engine, leads to further power losses due to friction in the bearings and the increased probability of damage due to the increased number of installed parts. In contrast, when compressed in several stages with intermediate cooling, less energy is required.

In order to compensate for the turbo lag resulting in the lower speed range, an exhaust gas turbocharger requires electronic boost pressure control with variable turbine geometry and bleed valves. This increases the effort and due to the increased number of installed parts increases the probability of damage.

STATE OF THE ART

So far, several methods, systems or devices are known which make a pre-compression outside of the combustion chamber.

So describes DE3931379A1 an internal combustion engine with pre-compression by a rotary compressor, wherein in the cylinder chamber still takes place a re-compression.

US 8499747 B2 deals with the pre-compression of an internal combustion engine through an exhaust turbine with variable turbine geometry, the driving force of the exhaust gas turbine is used directly for pre-compression. In the cylinder chamber, the combustion air is still recompressed.

TASK

The invention has for its object to completely compress the combustion air before the combustion chamber to the necessary operating pressure to reduce the weight of the engine and to increase the efficiency of the overall system.

SOLUTION

According to the invention this is achieved by an external, multi-stage, intercooled and complete compression of the combustion air via compressors outside the internal combustion engine. The power storage is powered, inter alia, by the operated by an exhaust gas expansion turbine generator.

The camshaft is replaced by solenoid valves, because they can open and close without seams. The inlet valve for the fresh air is spring-amplified according to the requirements of the high pressure. A compressed air compensation is also in question.

DESCRIPTION ACCORDING TO THE DRAWING

1 shows the inlet of the combustion air ( 1 ), which supplies the air of the first compression stage from admission pressure compressor ( 2 ) and intermediate cooling ( 5 ) feeds. After the intermediate cooling, the precompressed combustion air enters the second compression stage from the final pressure compressor ( 3 ) and intermediate cooling ( 6 ).

The compressed combustion air is at about 70% of half the crank rotation, which otherwise for the compression in the cylinder ( 14 ) of the internal combustion engine is required. The crankshaft is then about 30% away from the TDC.

After ignition, at the BDC of the piston ( 13 ) in the cylinder ( 14 ) the outlet solenoid valve ( 9 ) and the exhaust gases reach an expansion turbine ( 10 ), which has a generator ( 11 ), the electrical energy in the power storage ( 12 ) feeds.

The admission pressure compressor ( 2 ), which removes its air from the filter ( 1 ), and the final pressure compressor ( 3 ) are operated by the internal combustion engine or by an electric motor. The air is cooled by cooling water ( 7 ) cooled from the internal combustion engine.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3931379 A1 [0006]
• US 8499747 B2 [0007]

Claims (4)

System for intake and compression of combustion air for an internal combustion engine, characterized in that the compression of the combustion air is multi-stage and intercooled and completely outside the cylinder. For reasons of weight, at least a multiple higher speed for the compressors, as provided in the internal combustion engine. System according to claim 1, characterized in that the inlet and outlet of the combustion air for the internal combustion engine via magnets and electronics is controlled. System according to claim 1 and 2, characterized in that at the inlet valve of the internal combustion engine, a back pressure to the air pressure is necessary. System according to claim 1, 2 and 3, characterized in that the exhaust gases of the internal combustion engine operate an expansion turbine, which mechanically coupled operates a generator which feeds a power storage. For the utility model, claims 1 to 3 must be fulfilled together. The claim 4 is useful but not necessarily important for the utility model.

Images