Free piston linear generator matching optimization method based on engine

Abstract

The invention provides a free piston linear generator matching optimization method based on an engine, and belongs to a new energy automobile range extender, the method comprises the following steps: pre-selecting an engine with rated power P1, linear motor power P2 and mover mass m2, P2 = P1; determining the total mass m = m1 + m2 of the system, and determining the output power P actual of the system according to the total mass m; determining whether the following condition is satisfied: |(Pactual-P1) / P1|<=N; if (Pactual-P1) / P1<(-N), reducing the mover mass m2 of the motor, determining the output power P'actual of the system under the optimal mover total mass, reselecting the engine according to the P 'actual, matching new engine power P' 1, and repeating the process; if (P actual-P1) / P1>N, increasing the rotor mass m2 of the motor, determining the system output power P'actual under the optimal rotor total mass, reselecting the engine according to the P 'actual, matching new engine power P' 1, and then repeating the process.

Description

technical field [0001] The disclosure belongs to the technical field of range extenders for new energy vehicles, and in particular relates to an engine-based free-piston linear generator matching optimization method. Background technique [0002] The statements herein merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The free piston linear generator (FPLG) converts the heat energy generated by the internal combustion engine into electrical energy output through the motor, which can replace the auxiliary power unit of the extended-range hybrid electric vehicle. As a new power device, the free piston linear generator is a new energy source in the future. An important research direction of automobile power system. [0004] The internal combustion engine in the FPLG system has similar thermodynamic principles to the traditional internal combustion engine, but the crankshaft and flywheel mechanism are om...

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Problems solved by technology

If the matching between the two is poor, there will be problems such as low system operating frequency, mismatch between the rated power of the engine and the rated power of the motor, resulting in the failure of the engine and the linear motor to work in the best state, and the work efficiency is low. or lack of power” and other phenomena, resulting in the inability of the advantages of FPLG to be brought into play

For example, in a certain FPLG system, when the rated power of the engine used is 3kW, if a linear motor with a rated power of 3kW is designed to match the engine power, there may be "due to the relatively low quality of the motor mover and piston and other mover components." The problem is that the actual FPLG system has a low operating frequency and the actual output of the system is only 1.5kW", which makes the engine and linear motor not work in the best state, and the overall efficiency of the system is low

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