Method and system for restraining torsional vibration of three-cylinder engine type range extender system
A torsional vibration and engine technology, which is applied in the field of automotive power transmission and safety, can solve the problems of large engine vibration and radiation noise, crankshaft first-order reciprocating inertia moment, second-order reciprocating inertia moment and centrifugal inertia moment imbalance, etc., to achieve improvement The effect of better uniformity and suppression effect
Pending Publication Date: 2022-04-05
HEBEI UNIV OF TECH
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[0007] Due to the structure of the crankshaft of the three-cylinder engine itself, the first-order reciprocating moment of inertia, the second-order reciprocating moment of inertia and the centrifugal moment of inertia of the crankshaft are unbalanced, resulting in technical problems such as large vibration and radiated noise of the engine.
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Embodiment 1
[0099] Embodiment 1: For the reasons of the crankshaft structure of the three-cylinder engine itself, the first-order reciprocating moment of inertia, the second-order reciprocating moment of inertia and the centrifugal moment of inertia of the crankshaft are unbalanced, resulting in large vibration and radiation noise of the engine. The invention proposes a fuzzy PID control algorithm, which utilizes the output torque of the generator to actively suppress the torsional vibration. Taking the torque of the motor as the control variable and the mean square acceleration as the control target, PID and fuzzy PID controllers are used to actively control the rotational speed and torsional angular acceleration of the shafting system respectively, and the simulation calculation is carried out. The mean squared angular acceleration is proposed as the evaluation index of torsional vibration, and the active control effects of the three control methods are compared.
[0100] 1. Range exten...
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The invention discloses a method and system for suppressing torsional vibration of a three-cylinder engine type range extender system, and the method comprises the steps: building an 8-degree-of-freedom shafting forced vibration model, taking rotation speed fluctuation as an observation object, and verifying the precision of a simulation model through an experiment; and then taking the angular acceleration and the rotating speed as control targets, taking the motor torque as a control variable, and adopting a fuzzy PID controller to actively suppress torsional vibration. The mean square angular acceleration is used as an evaluation index of torsional vibration; analyzing the torsional vibration active suppression effect under the steady state and transient state working conditions; a simulation result shows that compared with a PID (Proportion Integration Differentiation) control mode which only takes the rotating speed as a control target under a steady-state working condition, the mean square angular acceleration is reduced by 68.3%; compared with a traditional PID control method, the mean square angular acceleration is reduced by 29.0%. The method provided by the invention can effectively inhibit the torsional vibration of the range extender shafting.
Description
technical field [0001] The invention relates to the technical field of automobile power transmission and safety, in particular to a method and system for suppressing torsional vibration of a three-cylinder engine type range extender system. Background technique [0002] Range Extended Electric Vehicle (REEV) has the advantages of low emission, low pollution and long battery life, and is regarded as an ideal transitional vehicle in the development of new energy vehicles. The significant difference between it and a battery electric vehicle (BEV) is the addition of a range extender coupled by a low-power engine and a generator to provide power for the power battery and extend the endurance. [0003] Torsional vibration will not only reduce the life of components, but also affect the NVH performance of the vehicle. The main power source of the range extender is the engine, and in a working cycle of the engine, each cylinder is ignited in turn to generate intermittent torque and...
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Login to View More IPC IPC(8): B60W30/20B60W50/00
Inventor 魏长银陈勇白书杰李彦林刘彩霞刘海陈光
Owner HEBEI UNIV OF TECH