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What difficulties do car heat management system have?
Apr 13, 2017

Thermal management is a concept of integration, if decomposed into minutiae, it will be a very large topic. At present, the starting point of the whole vehicle heat management is more inclined to "no heat hazard risk", it is not the starting point of low technical content, standing in a relatively low technical position. In fact, because every car project behind, there will be different expectations, so the general layout is also good, the performance and cost of each component is always different. such as the distance between the suspension and the catalytic converter, this project is 20mm, the project may be 30mm, so the suspension of the thermal damage is a relatively large difference, perhaps this project solves the problem, but other parts of the space is limited, but therefore compressed the security margin, are all. This is a long, the whole car of many contradictions, the last is nothing but a compromise solution, as to how to compromise, is a great learning. But today's vehicle heat management begins to ascend to the level of "energy management". To avoid flooding, do you want to build the dam hundreds of meters tall? In order to avoid the primitive, is not home to tuen several tons of rice? The answer is negative. In the process of avoiding heat damage, we will also prefer not to waste unnecessary energy. Here are a few things to include: 1. Under harsh conditions, the vehicle has no heat hazard risk; 2. Low load working conditions, water pumps, fans reduce power consumption, avoid waste; 3. The heating process avoids energy dissipation, improves emission, and improves the thermal efficiency of engine wall temperature appropriately and partly loads. The relationship between these three points is progressive. In addition, it is the passenger's demand for air-conditioning, on the control of the heater. In order to take into account these aspects of the content, it will involve a lot of specific problems. If the risk of heat damage is solved, the use of higher power, better performance fans, water pumps, heat sink, worry about overheating parts, or the heat source itself is worried about causing other parts of overheating, such as the above-mentioned catalytic converter and suspension, consider increasing the heat shield, or use of heat-resistant materials, or auxiliary circulating water cooling, such as turbocharger &EGR independent auxiliary pumps, and so on. If you want to avoid unnecessary power consumption, you need to design a good grasp of the performance of each component is not high, just right, in addition to the calibration data is done well, fans can not open. If you want to quickly heat car, reduce emissions, improve thermal efficiency, you need higher degrees of freedom, such as demand adjustable speed electronic fans, electronic pumps, electronic thermostat, etc., these technologies behind, is more complex control logic and more sophisticated calibration craft. The control logic also involves calculating methods of some parameters, and the sensors are chosen for the application condition and the precision of the measurement. If the warm wind is also to be taken into account on these foundations, to ensure that passengers are comfortable enough to perceive the ambient temperature, how the scheme of the cooling system, the direction of the waterway, how much flow each way water is, resistance, and so on, another topic, a deeper step, the whole vehicle driving, due to changes in the working conditions caused by the pump changes, resulting in changes in the flow, resulting in the wind temperature changes in the air conditioning in the car, and so on, are required to adjust the work of the school. So, if in a very high temperature environment, the whole car has a high risk of overheating, but also to use excess flow to meet air-conditioning? If you turn on the air conditioner in a very low temperature environment, do you need to open the heatsink fan? If these answers are known, how are these extreme conditions defined? If the design of parts can not be changed, then can reduce the engine output power to recover? Behind this sentence is the most painful, and the root of all the problems ... calibration. Therefore, the automotive thermal management, problems and technical difficulties are very much, but if you want to summarize in a word, it must be "multiple parts of the relationship between", because in the whole vehicle development process, each component is often independent and split, particularly in the inexperienced mainframe factory this phenomenon is common, often difficult to take into account the possible impact on their own, may be affected by other parts of the situation, and responsible for the whole vehicle Heat management team, it is difficult to understand the details of each component. Trying to get an optimum solution in hundreds of parts is a very difficult problem. Besides, this topic breaks down to minutiae, has more detail, detailed to each sub question, has the ability to solve, there are those who can sacrifice, what is needed to improve, in the limited development cycle, what kind of options can be selected, what kind of program can be done, and what the newer technologies can be used, and these new technologies will bring about how much more work, need the project team choice. As for the simulation, the test is the same. The precise requirements, the setting of the boundaries, the limitations of the environment, the conditions of the test are difficult, but both are ultimately analytical and validated. As long as you want to get is not difficult, difficult is some unimaginable things.