Process for the load-dependent control of a hydraulic drive for a compressor arranged at an internal-combustion engine

US4803969A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Hermann Hiereth · Eßlingen, DE
• Dieter Messerschmidt · Ditzingen, DE

Key dates

• Filing date: Jul 1, 1987
• Grant date: Feb 14, 1989
• Expiry date: Jul 1, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A process for the load-dependent control of a hydraulic drive for a compressor arranged at an internal-combustion engine, the compressor being driven by a hydraulic motor that, in turn, is acted upon by pressure from a hydraulic pump, the internal-combustion engine itself driving the hydraulic pump. In order to ensure a relatively high compressor speed as early as during the idling operation of the internal-combustion engine, and have available an optimal torque for a positive load change, while keeping minimal the additional fuel consumption required for the hydraulic drive, during the idling operation of the internal-combustion engine, the hydraulic pump is adjusted into the full-delivery position and the hydraulic motor is adjusted into the minimum intake position. Upon a subsequent positive load change, after an indicated hydraulic motor control pressure is reached, the hydraulic motor is guided into the maximum intake position, and after an indicated hydraulic pump control pressure is reached, the hydraulic pump is guided into the direction of the minimum delivery position. After an indicated charging pressure limit is reached, the hydraulic drive is disconnected from the comp…