Arrangement for regulating the response of an internal combustio

Details Arrangement for regulating the response of an internal combustio Arrangement for regulating the response of an internal combustio

1992-05-26

1993-06-01

Koczo, Michael

Power plants

Fluid motor means driven by waste heat or by exhaust energy...

With supercharging means for engine

F02B 3712

Patent

active

052149196

DESCRIPTION:

BRIEF SUMMARY
The invention relates to an arrangement for regulating the charge air pressure in an internal combustion engine having a turbo-charger.


PRIOR ART

For regulating the charge air pressure in the internal combustion engine of a vehicle, it is already known to use manual controls which, upon actuation by the driver, provide different degrees of regulation of the charge air pressure received from the compressor.
In turbo systems with a compressor arranged in the intake system of the engine and driven by a turbine arranged in the exhaust gas system of the engine and driven by exhaust gas, the charge air pressure can be regulated by a valve which is arranged in a bypass line bypassing the turbine and which regulates the exhaust gas flow through the bypass line and thus the turbine. This valve can be controlled directly by the engine intake pressure in such a way that, when the charge air pressure exceeds a certain value, the valve opens, whereupon the increase in the charge air pressure is reduced.
German patent application DE-A-2,362,133 shows such a system in which it is possible manually to increase the charge air pressure level at which the bypass valve opens. This results in an increase in the maximum charge air pressure and thus the torque to a higher level, which is maintained over the entire speed range and at all throttle positions. This means, however, that the engine must be dimensioned for the highest mechanical load occurring in the engine speed range and that the torque characteristic of the engine is increased uniformly over the entire speed range of the engine.
In German patent DE-C-2,928,902, the opening of the bypass channel is controlled, on the one hand, by the charge air pressure following the compressor and, on the other hand, by the pressure behind the throttle valve of the engine. The bypass valve opens here when the charge air pressure following the compressor exceeds an upper pressure level and when the pressure downstream of the throttle valve lies below a lower pressure level. In order to give a quicker response on acceleration from lower speeds when the charge air pressure has not had time to develop to a level exceeding the lower pressure level, the driver can manually cut out the effect of the pressure downstream of the throttle valve.
American patent U.S. Pat. No. 4,598,549 shows another system for manual turbo regulation in which the charge air pressure is ventilated off at selectable charge air pressure levels. By means of a change-over switch actuable by the driver, the turbo function can be regulated either in economy state or normal state where the charge air pressure is ventilated off at different levels for the respective turbo function state. This manual regulation too provides a uniform adaptation of the turbo pressure and thereby the engine torque over the entire speed range and at all throttle applications.
However, these previously known alternatives for manual regulation have had the disadvantage that the driver can only choose between different fixed supercharging levels which, for the turbo unit in question, give a similar appearance to the engine's speed-dependent torque characteristic or give a charge air regulation which is not affected by the throttle position or actual engine load.
The known regulating systems for supercharged internal combustion engines have only been able to act on the charge air pressure in a defined manner over the entire speed range or have only been active from the regulating point of view at certain speed ranges. The driver has therefore had limited possibilities of acting on the torque character of the engine as a function of the engine load.


OBJECT OF THE INVENTION

An object of the present invention is to improve, in a supercharged internal combustion engine, the possibility of regulating the response of the internal combustion engine to acceleration by means of a manually actuable regulating member which can be used to affect how the charge pressure builds up as a function of the engine load.
In an advantageous embodiment of the a

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