發(fā)布時(shí)間：2018-04-04 10:39

  本文選題：負(fù)載敏感　切入點(diǎn)：能量回收　出處：《浙江大學(xué)》2013年碩士論文

【摘要】：自上世紀(jì)70年代石油危機(jī)以來(lái),各汽車廠商和工程機(jī)械廠商紛紛開(kāi)始進(jìn)行節(jié)能技術(shù)的研究,很多技術(shù)也已經(jīng)得到了應(yīng)用。在工程機(jī)械領(lǐng)域,負(fù)載敏感液壓系統(tǒng)具有能對(duì)小負(fù)載進(jìn)行壓力補(bǔ)償?shù)奶匦?在擁有非常好的燃油經(jīng)濟(jì)性的同時(shí),極大地改善了多執(zhí)行器工作時(shí)的速度協(xié)調(diào)性問(wèn)題,因此在挖掘機(jī)這種要求很高動(dòng)作協(xié)調(diào)性的工程機(jī)械上應(yīng)用尤為廣泛。但在負(fù)載相差較大的情況下,其在壓力補(bǔ)償閥上會(huì)產(chǎn)生較多的能量和壓力損失。本研究以回油補(bǔ)償負(fù)載敏感液壓系統(tǒng)為例,對(duì)壓力補(bǔ)償閥上的能量損失情況進(jìn)行了研究,設(shè)計(jì)出一種以液壓蓄能器為儲(chǔ)能裝置,能對(duì)壓力補(bǔ)償閥上的能量進(jìn)行回收的回油補(bǔ)償負(fù)載敏感能量回收系統(tǒng)。 回油補(bǔ)償負(fù)載敏感能量回收系統(tǒng)是在一個(gè)典型的負(fù)載敏感系統(tǒng)基礎(chǔ)上,增加了蓄能器、電控?fù)Q向閥、變量馬達(dá)等部件,在不影響原有系統(tǒng)負(fù)載敏感特性的情況下,能對(duì)補(bǔ)償閥上損失的能量進(jìn)行回收。本研究中采用了一種獨(dú)立控制方案,根據(jù)電控?fù)Q向閥檢測(cè)到的補(bǔ)償閥閥前壓力和蓄能器當(dāng)前壓力,獨(dú)立控制各聯(lián)是否切換進(jìn)入能量回收模式。而當(dāng)不滿足壓力回收條件時(shí),又能自行退出能量回收模式。在蓄能器壓力高出需求值的時(shí)候,通過(guò)變量馬達(dá)釋放能量,和主泵通過(guò)扭矩耦合的方式提供能量輸出,以此來(lái)降低主泵的功率消耗,達(dá)到節(jié)能的目的。 根據(jù)回油補(bǔ)償負(fù)載敏感能量回收系統(tǒng)原理,以典型的小型挖掘機(jī)的參數(shù)進(jìn)行參數(shù)匹配。然后用液壓系統(tǒng)仿真軟件AMESim建模仿真,進(jìn)行三種控制策略的研究。最后根據(jù)三種控制策略的仿真結(jié)果來(lái)評(píng)價(jià)此能量回收系統(tǒng)在不同工作狀況下不同控制策略下的能量回收效果。結(jié)果顯示,在設(shè)定的負(fù)載變化情況下,該能量回收系統(tǒng)最多可回收59.9%本該要浪費(fèi)在壓力補(bǔ)償閥上的能量,綜合能量回收率最高可達(dá)9.5%。
[Abstract]:Since the oil crisis in the 1970s, automobile manufacturers and construction machinery manufacturers have begun to study energy-saving technologies, and many technologies have been applied.Therefore, it is widely used in excavator, which requires high coordination of movement.But in the case of large load difference, it will produce more energy and pressure loss on the pressure compensation valve.Taking the sensitive hydraulic system of oil recovery compensation as an example, the energy loss on the pressure compensation valve is studied, and a kind of energy storage device based on hydraulic accumulator is designed.Oil recovery load sensitive energy recovery system which can recover energy from pressure compensation valve.On the basis of a typical load sensitive system, the recovery-oil compensation load sensitive energy recovery system includes accumulator, electrically controlled directional valve, variable motor and so on, without affecting the load sensitive characteristics of the original system.The energy lost on the compensation valve can be recovered.In this study, an independent control scheme is used to independently control whether each connection can switch into the energy recovery mode according to the pressure in front of the compensation valve and the current pressure of the accumulator detected by the electronically controlled reversing valve.When the pressure recovery condition is not satisfied, the energy recovery mode can be withdrawn by itself.When the accumulator pressure is higher than the required value, the energy output is provided by the variable motor and the main pump through torque coupling, so as to reduce the power consumption of the main pump and achieve the purpose of energy saving.According to the principle of oil recovery compensation load sensitive energy recovery system, the parameters of a typical small excavator are matched.Then the hydraulic system simulation software AMESim is used to model and simulate the three control strategies.Finally, according to the simulation results of three control strategies, the energy recovery effect of the energy recovery system under different working conditions and different control strategies is evaluated.The results show that the energy recovery system can recover up to 59.9% of the energy that should have been wasted on the pressure compensation valve under the condition of the load change, and the highest comprehensive energy recovery rate can reach 9.5%.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU621

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本文編號(hào)：1709593