双模式电液全可变气门驱动系统的可控性研究

Investigation on Controllability of Dual-Mode Fully Variable Valve Electro-Hydraulic Actuation System

提出了一种紧凑型双模式电液全可变气门驱动系统方案。系统通过采用驱动-制动循环器和模式转换器,仅需两个供油器和三个电磁阀即可满足内燃机驱动和制动两种模式对气门运行的要求,并实现循环间、气缸间、气门运行参数间独立灵活可调的气门运行模式。采用AVL Hydsim软件对三种控制策略下系统的运行状况进行模拟,并对仿真结果进行相关性分析。研究结果表明:在三种控制策略下,通过控制电磁阀,实现了气门运行参数间的独立或者连续调节,气门运行参数与相应的控制参数之间存在高度线性相关,所有的相关系数均大于0.95,并且各影响系数均随着转速的变化呈现有规律的变化。

A compact dual-mode fully variable valve electro-hydraulic actuation system, consisting mainly of drive-brake condition and mode converters was proposed. Requirements for both engine drive and brake modes were fulfilled with only two oil supplier and three electromagnetic valves. Valves could be ad- justed independently by each cycle, cylinder and operating parameter. Valve events in three control strategies were simulated using AVL Hydsim software and based on the simulated results correlation analysis was car ried out. It is revealed that in three control strategies, valve operating parameters are adjusted independently or continuously by controlling electromagnetic valves, there exist highly linear correlations （correlation coef ficients^0.95） between valve operating parameters and corresponding control parameters, and the influen- cing coefficients change regularly with speed increasing.