直接關(guān)系到車輛信息技術(shù)服務(wù)中心服務(wù)質(zhì)量的高低,也影響著車主是否大量采用這個(gè)系統(tǒng),所以收集,整理專家知識(shí)的工作特別重要,其難點(diǎn)主要在于專家知識(shí)的收集與表述。因?yàn)楝F(xiàn)在的汽車制造廠商十分繁多,具體的車系更多。雖然現(xiàn)在大部分車輛都提供obd-ii接口,但是從接口中讀出的故障碼的信息十分有限;各大汽車生產(chǎn)廠商檢測(cè)故障用的手持設(shè)備與obd-ii通信的協(xié)議也各不一致,而且得到的故障碼包含的信息大量的是靠維修工人的經(jīng)驗(yàn)來(lái)判讀。所以專家知識(shí)的積累與整理顯得十分重要。
廈門岳航計(jì)算機(jī)工程有限公司
聯(lián)系人:李素云
企業(yè)QQ:2851195446,2851195466
手機(jī):18965423501
座機(jī):0592-5165501
在歸納知識(shí)時(shí)要考慮的因素很多, 為了充分利用專家系統(tǒng)的符號(hào)推理能力, 凡是能用數(shù)學(xué)公式描述的知識(shí), 均作為具體求解器的方法實(shí)現(xiàn),
其余的作為規(guī)則存儲(chǔ)于知識(shí)庫(kù)。
規(guī)則知識(shí)的表示形式為:
規(guī)則號(hào) if (前提) then (結(jié)論)
前提是一個(gè)條件或幾個(gè)條件的“and”形式,若是后一種情況,只有在幾個(gè)條件都成立時(shí),結(jié)論才被接受。每個(gè)條件可以是若干項(xiàng)的“or”形式。
發(fā)動(dòng)機(jī)噴油嘴故障嚴(yán)重,需馬上修理。
推理機(jī)設(shè)計(jì)時(shí)本系統(tǒng)采用了兩級(jí)es推理控制策略。結(jié)合領(lǐng)域知識(shí),將總體故障分析求解任務(wù)分解為不同的子任務(wù),如發(fā)動(dòng)機(jī)故障分析子任務(wù)、輪胎故障診斷子任務(wù)等。每個(gè)子任務(wù)有各自的目標(biāo)求解變量,服從不同的求解方法,彼此之間既相互獨(dú)立又存在著相互聯(lián)系。通過(guò)正向推理求解其目標(biāo)變量,并將所求結(jié)果顯示給車主。
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