英语翻译The previous control methods are feasible only when the

英语翻译
The previous control methods are feasible only when the fuel cells model is accurate enough and the controllers were developed assuming a perfect knowledge of the operating conditions for the fuel cell system.Plant uncertainties,such as changes in the membrane properties over time or variation in the ambient temperature,can affect the performance of the resulting control system,and,hence,more robust control design techniques should be investigated to guarantee system performance.In addition,most of the mentioned control algorithms are aimed at the PEMFC electrical power control,while the PEMFC temperature control is taken as supplement for power control,not even to consider the coolant circuit control design.Therefore,it is necessary to develop an accurate and simple coolant circuit model,and find suitable control method for dynamic temperature control.Generally,circulating coolant can be applied in removing the excess heat of the PEMFC whose electrical power exceeds 5 kW [23].In order to efficiently control the PEMFC temperature,a coolant circuit of a PEMFC is modeled based on the physical molar conservation principles and the energy balance theory.However,the performance of the generalized controller largely depends on the availability of an accurate model.As a consequence,the application of conventional control strategies may lead to unacceptable closed loop performances.The controller must be robust to uncertainty in a non-conservative manner and must meet closed loop objectives such as tracking,regulation and disturbance attenuation.Compared with conventional control strategies,fuzzy control is appropriate to use in temperature control applications because it is faster and cheaper to develop and easier to implement.It takes the advantage of the synthesis of the knowledge which is provided by human expertise (in the form of IFeTHEN rules),especially when the process model is unknown [24].So the incremental fuzzy control with integrator technique is designed according to the established model and control experience rule.The PEMFC temperature and coolant inlet temperature are controlled by regulating the circulating coolant flux and bypass valve factor respectively.

人工翻译,供参考.
The previous control methods are feasible only when the fuel cells model is accurate enough and the controllers were developed assuming a perfect knowledge of the operating conditions for the fuel cell system.
如果拥有足够精确的燃料电池模型,并在完全弄清楚该模型操作条件的情况下开发出控制装置,则前述的控制方法是可行的.
Plant uncertainties, such as changes in the membrane properties over time or variation in the ambient temperature, can affect the performance of the resulting control system, and, hence, more robust control design techniques should be investigated to guarantee system performance.
但是,厂房（工作环境）的不确定性,如随着时间的推移产生的膜变以及环境温度的变化,可能对控制系统的性能造成影响,所以,应研究出更强大的控制设计技术以保证系统的性能和运行.
In addition, most of the mentioned control algorithms are aimed at the PEMFC electrical power control, while the PEMFC temperature control is taken as supplement for power control, not even to consider the coolant circuit control design.
此外,前面提到的大多数控制技术仅着眼于质子交换膜燃料电池的电动控制,而质子交换膜燃料电池的温度控制仅是电动控制的一个方面,它甚至没有考虑冷却液的回路控制设计.
Therefore, it is necessary to develop an accurate and simple coolant circuit model, and find suitable control method for dynamic temperature control.
因此,开发一个简单和准确的冷却液回路模型,并找到动态温度控制方法是十分必要的.
Generally, circulating coolant can be applied in removing the excess heat of the PEMFC whose electrical power exceeds 5 kW.
通常,冷却液的循环流动可带走质子交换膜燃料电池产生的、电功率超过5千瓦的余热.
In order to efficiently control the PEMFC temperature, a coolant circuit of a PEMFC is modeled based on the physical molar conservation principles and the energy balance theory.
为了有效控制质子交换膜燃料电池的温度,质子交换膜燃料电池的冷却回路模型采用物质质量守恒定理和能量交换原理而进行设计.
However, the performance of the generalized controller largely depends on the availability of an accurate model.
然而,广义控制装置的性能在很大程度上取决于一个准确模型的建立.
As a consequence, the application of conventional control strategies may lead to unacceptable closed loop performances.
而采用常规控制技术则可能会导致一种无法预料的结果,即回路关闭.
The controller must be robust to uncertainty in a non-conservative manner and must meet closed loop objectives such as tracking, regulation and disturbance attenuation.
若采用非常规方式来消除不确定性,控制装置的功能就必须足够强大以应对回路的关闭,如必须具有跟踪、 调节和衰减控制等功能.
Compared with conventional control strategies, fuzzy control is appropriate to use in temperature control applications because it is faster and cheaper to develop and easier to implement.
与常规控制技术相比,由于开发时间短、成本低且容易实现,模糊控制技术在温度控制方面的应用非常广泛.
It takes the advantage of the synthesis of the knowledge which is provided by human expertise (in the form of IFeTHEN rules), especially when the process model is unknown.
该技术采用专家综合分析系统（运用IFeTHEN推定法则）,特别是当过程模型未知时应用该技术效果会更理想.
So the incremental fuzzy control with integrator technique is designed according to the established model and control experience rule.
鉴于此,通过建立控制法则和经验模型,研发设计出了增量模糊控制与集成技术.
The PEMFC temperature and coolant inlet temperature are controlled by regulating the circulating coolant flux and bypass valve factor respectively.
这样,对质子交换膜燃料电池温度和冷却液入口温度的控制,分别通过对回路中冷却液流量和分流系数的调节而得以实现.