Control method of two-stage adjustable pressure boost control system

Abstract

The invention discloses a secondary adjustable boosting control system. The secondary adjustable boosting control system comprises a high-pressure booster with a variable-section spray nozzle, and a low-pressure booster, which are connected in series, wherein the low-pressure booster comprises a low-pressure air compressor and a low-pressure turbine; a low-pressure intake by-pass valve and a low-pressure exhaust regulating valve are respectively arranged on by-pass pipelines of the low-pressure air compressor and the high-pressure turbine; the high-pressure booster comprises a high-pressure air compressor and a high-pressure turbine; and the high-pressure turbine is equipped with the variable-section nozzle and a high-pressure exhaust regulating valve is arranged on a by-pass pipeline connected in parallel with the high-pressure turbine. The invention further discloses a control method of the control system, and can realize supercharge pressure adjustment of a diesel engine at different altitudes and under different working conditions through controlling the opening and closing, as well as the opening degree, of all valves and utilizing the MAP value to achieve adjustment in a negative feedback mode so as to achieve the goal that the power of the engine at the altitude of 5,500 calibration point restores to 90 percent of the calibration point under the plain condition.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a control method of a two-stage adjustable supercharging control system. Background technique [0002] As altitude increases, atmospheric pressure decreases and engine power decreases. In order to restore the power of the engine at an altitude of 5500m to reach the goal of 90% of the plain power, the pressure ratio of the compressor should be at least 4.8 in the range from the maximum torque point to the calibration point. If a single-stage supercharging scheme is adopted, there is currently no compressor in the world that can meet such a high pressure ratio and flow range requirements, so a two-stage adjustable supercharging is required. [0003] However, most of the current two-stage supercharging control systems are aimed at various working conditions at fixed altitudes, and there is a large difference in altitude for different regions. When the matching point of the two-stag...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical defects of the existing two-stage supercharging system, the two-stage adjustable supercharging control system provided by the present invention can adjust the opening of each valve of the supercharger and the variable-section nozzle according to the change of the altitude and the engine working condition, so as to Reach the target of 90% of the calibration point of the engine at the calibration point at an altitude of 5500m to restore the power of the plain condition

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