Control method and system for top dead center position of free piston linear generator

Abstract

The invention provides a control method and system for the top dead center position of a free piston linear generator. A relation MAP graph of a rotor and the top dead center position is obtained based on the corresponding relation between the movement speed of the rotor at a certain position before the top dead center position and the ignition moment when the FPLG rotor can move to the top dead center position; and according to the MAP graph and the actual speed of the rotor at a certain position before the top dead center position or the deviation between the actual speed and the target speed, the optimal ignition moment is calculated through interpolation, an engine spark plug is controlled to ignite according to the optimal ignition moment based on the optimal ignition moment, it is guaranteed that the actual top dead center position where the rotor can reach is close to the set top dead center position, and accordingly, the stable operation of the FPLG is ensured. According to thedisclosed technical scheme, the generator load is adjusted according to the real-time combustion condition, the rotor can reach the position near the designed top dead center, the rotor speed monitoring at a certain position in front of the top dead center is combined, and the next optimal ignition moment is determined according to the actual speed and the target speed difference at the position;and accordingly, it is guaranteed that a piston can more stably run to the next top dead center, the position fluctuation of the top dead center is smaller, and stable running of the FPLG is furtherrealized.

Description

technical field [0001] The disclosure belongs to the technical field of controlling the top dead center position of a free-piston linear generator, and in particular relates to a control method and system for a top dead center position of a free-piston linear generator. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] At present, the common free-piston linear generator (FPLG) structures are mainly divided into three types: single-piston type, opposed double-piston type (referred to as opposed type) and back-mounted double-piston type (referred to as back-mounted type). Compared with the traditional internal combustion engine, FPLG reduces the crank connecting rod mechanism, has a simple structure, low friction, and improved thermal efficiency, and has a good application prospect. However, FPLG has the difficulty of controlling the piston m...

AI Technical Summary

Problems solved by technology

[0004] Due to the influence of engine combustion cycle changes, if the load of the linear motor is not controlled, the mover may not be able to reach the top dead center position or exceed the top dead center position, resulting in problems such as knocking or misfire, resulting in shutdown

If only the generator load is adjusted during operation, there may be adjustment errors due to problems such as adjustment methods or sensitivity, resulting in large fluctuations in the possible position of the top dead center

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