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本文介绍的极限值发动机(EVE)是一种独特的缸径为200mm、专门用于试验研究的中速试验机,其基本结构设计成可满足高负荷和易于接近燃烧室的需要。电空系统的采用扩展了发动机的能力,使之可以实时修改若干参数,能够快速改变气门定时、增压空气参数、排气背压以及燃油喷射参数。在2001年CIMAC会议上首次介绍了该单缸试验机,在2004年CIMAC会议上介绍了其首次运行试验情况。其后,在赫尔辛基理工大学的内燃机实验室完成了几种不同的发动机试验。这些试验导致了发动机和辅助系统的某些修改,使其实用性、运行可靠性和安全性得到提高。在首台样机试验和经验基础上推出了一种全新的第二代气门系统。该系统是与坦佩雷理工大学液力与自动化研究所合作研制的。新的气门装置有两个致动器(原先的系统采用4个),而且发动机机油用作液压流体。高速控制系统重新编程,以充分发挥气门系统可控性的优势。为了产生与产品发动机相似的燃烧室条件,更换了气缸盖和喷射系统。在本文中将介绍该发动机目前的运行状态,其中着重介绍试验发动机的试验结果和运行结果。特别令人感兴趣的是电子-液压气门系统、发动机控制系统和辅助系统。文中将对气门运行数据(诸如开/关点和速度、气门升程、可调气门重叠角和各种运行模式)、增压空气压力和温度限值、燃料喷射系统性能、冷却系统参数以及测量系统与测试仪器逐一进行介绍。另外,还将介绍一维模型的结构,该模型用于许多方面,本文介绍其在支持实验室试验或在设计、评估未来发动机研究工作中具备的优势。
This article describes the limit value engine (EVE) is a unique diameter of 200mm, designed for experimental research in the medium-speed testing machine, the basic structure designed to meet the high load and easy access to the combustion chamber needs. The adoption of the electro-pneumatic system extends the engine’s ability to modify several parameters in real time and quickly change valve timing, charge air parameters, exhaust back pressure, and fuel injection parameters. The single cylinder test machine was first introduced at the 2001 CIMAC meeting and presented at CIMAC 2004 for its first run test. Subsequently, several different engine tests were completed at the internal combustion engine laboratory at Helsinki University of Technology. These tests led to some modifications to the engine and auxiliary systems, leading to increased availability, operational reliability and safety. In the first prototype test and experience based on the introduction of a new second-generation valve system. The system was developed in cooperation with the Institute of Hydraulic and Automation at Tampere Polytechnic University. The new valve device has two actuators (the original system uses four), and the engine oil is used as a hydraulic fluid. High-speed control system reprogrammed to take full advantage of the controllability of the valve system. In order to produce combustion chamber conditions similar to the engine of a product, the cylinder head and injection system are replaced. In this paper, we will introduce the current operating status of the engine, which focuses on the test results of the test engine and the results of the operation. Of particular interest are electro-hydraulic valve systems, engine control systems and auxiliary systems. Valve operating data (such as on / off point and speed, valve lift, adjustable valve overlap angle and various operating modes), charge air pressure and temperature limits, fuel injection system performance, cooling system parameters and measurements System and test equipment one by one to introduce. In addition, we will introduce the structure of a one-dimensional model that is used in many ways. This article describes its advantages in supporting laboratory experiments or in designing and evaluating future engine research.