METHOD FOR REGULATING OR CONTROLLING A SUPERCHARGED INTERNAL COMBUSTION ENGINE

• Main Author: SCHMID, WOLFRAM
• Format: Patent
• Language: English; French; German
• Published: 19.11.2003
• Edition: 7
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

In a method for the closed-loop or open-loop control of a forced-induction internal combustion engine that includes an exhaust turbocharger with an exhaust turbine with varible turbine geometry for the varible adjustment of the effective turbine cross section and with a boost-air compressor, different operating states of the engine are assigned different characterisitic maps with engine-operating and/or engine-state varibles and the turbine geometry is adjusted in accordance with the characteristic maps between an open position and a pressure build-up position. When there is a change in a significant engine parameter, the system switches between two characteristic maps.To optimize the operating behaviour of the engine over all load and engine-speed ranges, two load/engine-speed ranges are defined above and below a specifiable limiting value and each load/engine-speed range is assigned a characteristic map, the current load/engine-speed range is identified by means of the engine parameter, in the lower load/engine-speed range adjustment of the variable turbine geometry is performed by means of open-loop control as a function of the characteristic map assigned to the lower load/engine-speed range, and in the upper load/engine-speed range adjustment of the variable turbine geometry is performed by means of closed-loop control as a function of the charateristic map assigned to the upper load/engine-speed range.