Two-stage supercharging system matching method based on simulation calculation

Abstract

The invention discloses a two-stage supercharging system matching method based on simulation calculation, first-stage electric supercharging and second-stage turbocharging which are arranged in seriesare adopted in two-stage supercharging, and an electric supercharger is provided with a bypass pipeline. During two-stage supercharging matching, firstly, according to the performance development target of an engine, the air inlet flow and pressure requirements of the engine are obtained through analysis, the actual measurement performance Map of a turbine and an air compressor is matched according to the requirements, and the scheme that the low-speed torque, the maximum torque section, the rated power and the plateau power of the engine are comprehensively optimal is selected. On the basis,the bypass branch is closed, two-stage supercharging joint matching is conducted, the rotating speed of the electric supercharger is adjusted to conduct first-stage supercharging, the inlet air pressure of the turbocharger is increased, second-stage supercharging is conducted through the turbocharger, and therefore the effects of increasing the low-speed torque of the engine and expanding the range of the maximum torque section are achieved. And the simulated electric supercharging rotating speed and turbocharging waste gas bypass valve data are used for rack calibration development.

Description

technical field [0001] The invention relates to the technical field of analog control of automotive electronic systems, in particular to a method for matching a two-stage booster system based on simulation calculation. Background technique [0002] With the miniaturization of gasoline engines and the improvement of power requirements, superchargers have become the key technical means of OEMs. Now the relatively mature research is on the control of single-stage supercharging. Due to the more complex and changeable working conditions of the two-stage supercharging system, it is necessary to simulate the switching model between the two-stage supercharging and the control results of the entire working condition. To improve the feasibility of actual electronic control system calibration. Currently existing methods, such as the system and control method described in the Chinese patent "Two-Stage Turbocharger Control System and Method" with the publication number CN103670676A, ado...

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Problems solved by technology

Currently existing methods, such as the system and control method described in the Chinese patent "Two-Stage Turbocharger Control System and Method" with the publication number CN103670676A, adopt a two-stage turbocharger series arrangement, and the matching control needs to be based on The expected pressure determines the duty factor of the first turbocharger, and then determines the duty factor of the second turbocharger. The matching process is complex and slow, and for the same expected pressure, there are multiple groups due to the difference in the first expected pressure. Different duty cycle matching results

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