Process for controlling the boost pressure in an internal-combus

Details Process for controlling the boost pressure in an internal-combus Process for controlling the boost pressure in an internal-combus

1991-08-15

1992-12-29

Koczo, Michael

Power plants

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

With supercharging means for engine

F02B 3712

Patent

active

051741199

ABSTRACT:
A process for adjusting the boost pressure in an internal-combustion engine, supercharged by an exhaust-gas turbocharger with adjustable turbine diffuser, to a predetermined desired boost-pressure value dependent on the operating point. To improve the efficiency of the internal-combustion engine in the non-steady-state mode, especially after a positive load change out of low load and speed ranges, or, after a positive load change during the non-stead-state mode, below a predetermined threshold value for the exhaust-gas counterpressure upstream of the turbine the boost pressure is regulated according to a first characteristic corresponding to the instantaneous true deviation of the actual boost-pressure value from the desired boost-pressure value. After this threshold value has been exceeded, the exhaust-gas counterpressure is regulated predetermining hypothetical control deviations for the boost-pressure control circuit according to a special characteristic.

REFERENCES:
patent: 2944786 (1960-07-01), Angell et al.
patent: 4765141 (1988-08-01), Hirabayashi
patent: 4773225 (1988-09-01), Bachschmid et al.
"Variable-Geometry Turbo Increases Power, Minimizes Response Lag"-Automotive Engineering, Sep. 1985, pp. 70-72.

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