SIMULATION OF OPERATION OF THE AUTOMATED SYSTEM OF LOCAL MULTI-CIRCUIT COOLING OF PARTS OF AUTOTRACTOR DIESEL ENGINE

Q4 Engineering
А.В. Триньов, D. Sivykh
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Abstract

The results present the intermediate stage of the study of the thermal state of individual heat-stressed parts and units of a forced tractor diesel engine in the conditions of their local air cooling (LAC), which is regulated in automatic mode. Possibilities of practical implementation on the basis of microprocessor control systems of multi-circuit local cooling of parts of valve exhaust unit, bearing unit of turbocharger, if necessary, additional air cooling of the upper part of cylinder blocks in the area of cylinder liners are considered and evaluated. The listed parts, as evidenced by the results of many engine tests, differing in the values of the maximum critical temperatures, which in turn depend on the course of heat exchange processes in the corresponding interfaces, nodes. At the same time, in the conditions of operation with the use of the LAC system on the diesel engine there are additional problems associated with the complication of the cooling control algorithm, the need to move to multi-circuit options with their critical temperature values and required cooling air costs. At this stage of the study, a test was performed in the test mode of the algorithm for supply control and shutdown of the coolant supply, the corresponding circuit solutions for its implementation. In the engineless experiment, previously specially designed and thermocoupled units were used, which were heated separately with the set test temperatures, as well as a series-produced unit, which is part of the 4th generation gas cylinder equipment (GCE) of modern engines. The unit consists of four sections with solenoid valves, which dose the gas supply to the injectors according to a given algorithm (Valtek type 30). At the input of the engineless experiment, this unit was used to turn on and off the supply of compressed cooling air in separate circuits (from 2 to 4). The moments of operation of the valves (opening-closing) corresponded to the set test temperatures. In addition to the dynamics of temperature changes at the control points of the research units during the cooling process, the pressure, temperature, and coolant flow rates on individual circuits were also monitored. The conducted engineless experiment confirmed the correctness of the adopted circuit solutions, and also proves the possibility of further application of serial GCE units in LAC systems.
汽车拖拉机柴油机零件局部多回路冷却自动化系统运行仿真
研究结果表明,在自动调节的局部空气冷却条件下,强制拖拉机柴油机单个热应力部件和机组的热状态研究处于中间阶段。考虑并评价了基于微处理器控制系统对气门排气单元、涡轮增压器轴承单元部分进行多回路局部冷却,必要时对缸体上部气缸套区域进行额外空气冷却的可行性。正如许多发动机试验结果所证明的那样,所列部件的最高临界温度值不同,而最高临界温度又取决于相应接口、节点的热交换过程。与此同时,在柴油发动机上使用LAC系统的操作条件下,还存在与冷却控制算法的复杂性相关的其他问题,需要转向具有临界温量值的多回路选项,以及所需的冷却空气成本。在本阶段的研究中,在测试模式下对该算法进行了供应控制和冷却剂供应关闭的测试,并对其实施了相应的电路解决方案。在无发动机实验中,使用了先前专门设计的热电偶单元,它们在设定的测试温度下单独加热,以及批量生产的单元,这是现代发动机第四代气瓶设备(GCE)的一部分。该装置由四个带有电磁阀的部分组成,根据给定的算法(Valtek 30型)向喷射器提供气体供应。在无发动机实验输入时,该装置用于在单独的回路(从2到4)中打开和关闭压缩冷却空气的供应。阀门的操作时刻(打开-关闭)对应于设定的测试温度。除了在冷却过程中研究单元控制点的温度变化动态外,还监测了各个回路的压力、温度和冷却剂流量。进行的无发动机实验证实了所采用电路方案的正确性,也证明了串行GCE单元在LAC系统中进一步应用的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
1.00
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3050
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