摘 要: 汽車(chē)胎壓監(jiān)測(cè)系統(tǒng)(TPMS)被譽(yù)為新一代汽車(chē)高科技安全配備用品。針對(duì)當(dāng)前汽車(chē)胎壓監(jiān)測(cè)系統(tǒng)（TPMS）不能全天候監(jiān)測(cè)輪胎狀況以及車(chē)輛不能進(jìn)行遠(yuǎn)程報(bào)警的問(wèn)題，提出了一種基于nRF9E和GSM模塊的新型胎壓監(jiān)測(cè)系統(tǒng)的設(shè)計(jì)方案。介紹了系統(tǒng)的總體結(jié)構(gòu)，從軟硬件兩方面描述了系統(tǒng)的設(shè)計(jì)實(shí)現(xiàn)方法，重點(diǎn)描述了系統(tǒng)的低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" 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title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" 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title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)" title="低功耗設(shè)計(jì)">低功耗設(shè)計(jì)和按鍵顯示輪胎定位的方法。該系統(tǒng)不僅能夠?qū)崟r(shí)監(jiān)測(cè)輪胎狀況，對(duì)異常情況進(jìn)行報(bào)警提示，并能通過(guò)GSM模塊通信通知車(chē)主,而且具有車(chē)載CAN網(wǎng)絡(luò)接口，在低功耗、可靠性以及安全性方面具有一定優(yōu)勢(shì)。
　　關(guān)鍵詞：TPMS；nRF9E；輪胎定位；GSM；實(shí)時(shí)監(jiān)測(cè)

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　　隨著我國(guó)汽車(chē)工業(yè)的發(fā)展和人民生活水平的提高，汽車(chē)越來(lái)越多地進(jìn)入普通家庭，汽車(chē)的安全防盜性能也越來(lái)越為人們所重視。在汽車(chē)高速行駛過(guò)程中,輪胎故障是突發(fā)性交通事故的重要原因。據(jù)統(tǒng)計(jì),在高速公路上發(fā)生的交通事故中約有70%是由爆胎引起的^[1]。而保持標(biāo)準(zhǔn)的車(chē)胎氣壓行駛和及時(shí)發(fā)現(xiàn)車(chē)胎漏氣是防止爆胎的關(guān)鍵,因此對(duì)汽車(chē)輪胎壓力、溫度等參數(shù)的監(jiān)控是安全駕駛的重要保障。開(kāi)發(fā)和研究汽車(chē)輪胎壓力監(jiān)測(cè)系統(tǒng)TPMS(Tire Pressure Monitoring System)是確保行車(chē)安全的有效技術(shù)措施,也是當(dāng)前值得研究的重要課題。本文研究的汽車(chē)胎壓監(jiān)測(cè)系統(tǒng)，不僅能夠解決目前的汽車(chē)胎壓檢測(cè)系統(tǒng)不能全天候檢測(cè)輪胎狀況和車(chē)輛不能進(jìn)行遠(yuǎn)程報(bào)警的問(wèn)題，而且低投入、高效率的特性使其具有較好的使用價(jià)值和廣闊的市場(chǎng)前景。
1 系統(tǒng)的總體設(shè)計(jì)
1.1 系統(tǒng)的總體結(jié)構(gòu)
　　系統(tǒng)的總體結(jié)構(gòu)框圖如圖1所示。系統(tǒng)主要由輪胎檢測(cè)模塊、無(wú)線接收模塊、人機(jī)交互模塊和GSM模塊組成。輪胎檢測(cè)模塊采用氣門(mén)嘴外置式安裝方法安裝在汽車(chē)的輪胎上，對(duì)輪胎的溫度、壓力電壓、加速度參數(shù)進(jìn)行實(shí)時(shí)測(cè)量，并將測(cè)量的數(shù)據(jù)通過(guò)射頻（RF）通信接口發(fā)送，無(wú)線接收模塊接收到有效數(shù)據(jù)后，通過(guò)CAN通信接口將數(shù)據(jù)傳送到人機(jī)交互模塊來(lái)進(jìn)行處理和顯示，如發(fā)現(xiàn)異常，及時(shí)報(bào)警提示。當(dāng)車(chē)主遠(yuǎn)離車(chē)輛時(shí)，如果車(chē)輛遭到非法破壞，啟動(dòng)GSM模塊以短消息的形式將具體情況發(fā)送到車(chē)主手機(jī)，車(chē)主收到消息后，可及時(shí)采取防范措施。更重要的是，由于系統(tǒng)使用GSM網(wǎng)絡(luò)作為系統(tǒng)通信的媒介，凡是GSM網(wǎng)絡(luò)能覆蓋的地方就能保證系統(tǒng)正常運(yùn)行，所以系統(tǒng)基本不受距離的限制^[2]。

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1.2 輪胎定位功能的設(shè)計(jì)
　　系統(tǒng)輪胎檢測(cè)模塊定位功能設(shè)計(jì)的出發(fā)點(diǎn)是采用可靠、便捷、低成本的輪胎檢測(cè)模塊定位技術(shù)^[3]。本系統(tǒng)采用的是按鍵顯示輪胎定位技術(shù)，此方法最大好處在于完全利用已有的硬件資源，不需要添加任何其他的硬件設(shè)備，完全由軟件實(shí)現(xiàn)。定位時(shí)，可以同時(shí)設(shè)置報(bào)警閥值。
　　定位功能設(shè)計(jì)要考慮兩種情況:一是輪胎置換保養(yǎng)時(shí)的定位;二是當(dāng)更換1個(gè)或同時(shí)更換2個(gè)及以上輪胎檢測(cè)模塊時(shí)的定位。輪胎置換保養(yǎng)時(shí)的定位非常容易實(shí)現(xiàn),由于輪胎檢測(cè)模塊采用氣門(mén)嘴外置式安裝方式,當(dāng)輪胎更換位置時(shí),將模塊從輪胎氣門(mén)嘴卸下重新安裝到原來(lái)的位置即可,而當(dāng)模塊損壞需要更換時(shí),則通過(guò)將輪胎檢測(cè)模塊直接連到控制中心的顯示模塊上進(jìn)行設(shè)置來(lái)實(shí)現(xiàn),其具體步驟如下:
　　（1）將新的輪胎檢測(cè)模塊旋入顯示模塊的串口，中心模塊的LED亮表示可以進(jìn)行定位設(shè)置;
　　（2）按設(shè)置鍵進(jìn)入設(shè)置界面，通過(guò)移動(dòng)鍵選擇輪胎定位設(shè)置進(jìn)入設(shè)置界面，選擇定位位置時(shí),相應(yīng)的輪胎指示燈點(diǎn)亮，當(dāng)按下確定鍵后,輪胎定位的位置已經(jīng)確定，接著設(shè)置報(bào)警閥值，再次按下確認(rèn)鍵后，顯示模塊便把此位置信息通過(guò)串口存儲(chǔ)到輪胎檢測(cè)模塊中,同時(shí)輪胎檢測(cè)模塊將自身的傳感器ID碼傳送到顯示模塊;
　　（3）旋出輪胎檢測(cè)模塊并安裝到相應(yīng)的位置。
　　顯示模塊通過(guò)串口發(fā)送給輪胎檢測(cè)模塊的位置信息為簡(jiǎn)單的二元編碼00、01、10和11,它們分別代表一個(gè)輪胎位置。這種有線的設(shè)置方式可靠性高,避免了無(wú)線方式的干擾問(wèn)題,操作簡(jiǎn)便,成本低。
1.3 系統(tǒng)的低功耗設(shè)計(jì)
　　系統(tǒng)的低功耗設(shè)計(jì)包括硬件和軟件設(shè)計(jì)兩個(gè)方面。硬件設(shè)計(jì)與元器件的選擇有關(guān),而軟件設(shè)計(jì)則主要是采用高效的算法協(xié)調(diào)工作與睡眠模式的切換,以及各模塊間的通信連接及通信效率。
1.3.1 硬件低功耗設(shè)計(jì)與實(shí)現(xiàn)
　　在硬件的設(shè)計(jì)上,主要是選擇使用低功耗、具有睡眠模式的器件,并進(jìn)行有效的電路設(shè)計(jì)。
　　(1)發(fā)射芯片的選擇與低功耗設(shè)計(jì)
　　考慮到模塊的體積，選擇MCU和發(fā)射芯片集成的器件nRF9E5,既能進(jìn)一步降低PCB成本,又能降低各模塊間的通信能耗。nRF9E5是Nordic VLSI公司推出的系統(tǒng)級(jí)RF芯片，適用于汽車(chē)工業(yè)領(lǐng)域。它內(nèi)置高性能增強(qiáng)型51單片機(jī)(4 clock)，單片機(jī)全速運(yùn)行功耗1 mA@4M。工作電壓1.9～3.6 V，待機(jī)功耗2 μA，具有完全的低功耗設(shè)計(jì)，可以直接使用電池工作。它存在發(fā)送、接收、待機(jī)（空閑）和掉電（睡眠）4種狀態(tài)。從耗電情況來(lái)看，在發(fā)送狀態(tài)的能量消耗最大，典型電流為30 mA；接收狀態(tài)次之，典型電流為12.5 mA；待機(jī)狀態(tài)典型電流為32μA；而在掉電狀態(tài)下能量消耗最小，其典型電流為2.5μA^[5]。因此，提高通信效率、減少不必要的發(fā)送和接收，無(wú)需通信時(shí)盡快進(jìn)入睡眠狀態(tài)是降低設(shè)備能耗的有效措施之一。另外，nRF9E5是一款發(fā)射功率可變的無(wú)線芯片，在保證通信質(zhì)量的前提下，可以盡量降低信號(hào)的發(fā)射功率。信號(hào)發(fā)射功率的降低會(huì)使發(fā)送節(jié)點(diǎn)的功耗下降，可以節(jié)省能量。
　　(2)傳感器的選擇與低功耗設(shè)計(jì)
　　對(duì)于傳感器,需要選擇實(shí)時(shí)性高,穩(wěn)定性強(qiáng),具備喚醒功能的低功耗器件。本系統(tǒng)采用英飛凌公司的SP12多功能傳感器。該傳感器具有喚醒瞬態(tài)工作模式,即每6s輸出一個(gè)喚醒信號(hào),每50 min輸出一個(gè)復(fù)位信號(hào)；工作在睡眠模式時(shí),電流消耗僅0.6μA/s。該傳感器還集成有加速度傳感器模塊,利用加速度啟動(dòng)喚醒機(jī)制。輪子轉(zhuǎn)速大,離心力大,離心加速度也大；反之,離心加速度小。當(dāng)檢測(cè)到加速度很小時(shí)(表示汽車(chē)沒(méi)有運(yùn)動(dòng)),讓系統(tǒng)進(jìn)入睡眠狀態(tài)；加速度比較大時(shí),喚醒傳感器工作。由車(chē)輪轉(zhuǎn)速可計(jì)算出車(chē)輪轉(zhuǎn)動(dòng)的角速度ω,其加速度(輪子轉(zhuǎn)動(dòng)的離心加速度) a=ω²r(r為發(fā)射模塊相對(duì)于輪軸的距離)也可方便地測(cè)量出來(lái)。通過(guò)判斷加速度的大小,在程序中設(shè)定不同的測(cè)試時(shí)間間隔和發(fā)射數(shù)據(jù)時(shí)間間隔,可以有效地控制傳感器模塊與MCU的通信次數(shù)和通信速度,以便最大限度地節(jié)約電池?fù)p耗,延長(zhǎng)電池的使用壽命^[6]。
　　(3)中央微處理器的選擇與節(jié)能設(shè)計(jì)
　　ATmega128是基于AVRRISC結(jié)構(gòu)的8位低功耗CMOS微處理器。它可由軟件配置成6種不同省電模式，而各種低功耗模式又可以通過(guò)中斷方式回到工作模式。利用ATmega128的這種特性通過(guò)編程，適當(dāng)?shù)貙?duì)其設(shè)置；當(dāng)沒(méi)有數(shù)據(jù)接收處理時(shí)，將MCU置于低功耗模式；而當(dāng)有任務(wù)需要處理時(shí)，將它從低功耗模式下喚醒，進(jìn)行工作；當(dāng)工作完成以后重新進(jìn)入低功耗模式，從而節(jié)約能量。
1.3.2 軟件低功耗設(shè)計(jì)與實(shí)現(xiàn)
　　系統(tǒng)軟件的低功耗設(shè)計(jì)是實(shí)現(xiàn)系統(tǒng)低功耗設(shè)計(jì)的另一個(gè)重要方面。軟件設(shè)計(jì)中，重要的是要充分保證模塊間通信的可靠性,模塊的穩(wěn)定性和各模塊的協(xié)調(diào)性。
　　在輪胎檢測(cè)模塊中，利用喚醒和加速度傳感器相結(jié)合的方法來(lái)實(shí)現(xiàn)低功耗設(shè)計(jì)。由于汽車(chē)大部分時(shí)間處于靜止?fàn)顟B(tài),讓系統(tǒng)進(jìn)入休眠模式可以極大地延長(zhǎng)電池使用壽命。輪胎檢測(cè)模塊從休眠模式轉(zhuǎn)為工作模式可以通過(guò)傳感器SP12的wakeup信號(hào)實(shí)現(xiàn)。當(dāng)測(cè)試的加速度為0時(shí)，說(shuō)明汽車(chē)處于停止?fàn)顟B(tài)，模塊進(jìn)入休眠狀態(tài)，當(dāng)喚醒5次的時(shí)候，再次測(cè)試加速度若加速度還為0，測(cè)試氣壓，如果氣壓正常,進(jìn)入休眠模式；如果氣壓異常，說(shuō)明輪胎遭到破壞，繼續(xù)測(cè)試其他參數(shù)等待發(fā)射;當(dāng)加速度大于0并且大于設(shè)定的閥值時(shí)，汽車(chē)處于高速運(yùn)行狀態(tài)，每隔1 s測(cè)量一次輪胎的參數(shù)，當(dāng)加速度小于設(shè)定的閥值時(shí)，汽車(chē)處于低速行駛狀態(tài)，以較長(zhǎng)時(shí)間間隔測(cè)試輪胎的參數(shù)。
　　由于射頻信號(hào)的發(fā)射功耗是胎壓檢測(cè)模塊電量消耗最多的部分。為了有效減少能耗，當(dāng)汽車(chē)進(jìn)入行駛狀態(tài)時(shí)，通過(guò)檢測(cè)壓力來(lái)決定發(fā)送輪胎信息的頻率。當(dāng)測(cè)量的壓力值正常時(shí)，較長(zhǎng)時(shí)間發(fā)射數(shù)據(jù)一次；由于汽車(chē)的工作環(huán)境復(fù)雜多變，采集到的信號(hào)有可能出現(xiàn)尖峰毛刺現(xiàn)象，特別是輪胎壓力信號(hào)。因此，當(dāng)壓力值超標(biāo)時(shí)，為了防止誤報(bào)警，采取中值濾波的方法來(lái)確認(rèn)壓力值，若確實(shí)超標(biāo)，進(jìn)入快速發(fā)送模式，立即發(fā)射數(shù)據(jù)，接收到返回的確認(rèn)信號(hào)后，進(jìn)入待機(jī)模式，等待下一次的喚醒。
　　同樣，中央控制器采取中斷方式操作，當(dāng)有有效數(shù)據(jù)顯示時(shí)，中斷喚醒MCU進(jìn)行數(shù)據(jù)處理并顯示，完成之后，繼續(xù)進(jìn)入省電模式，等待下一次的喚醒。
2 系統(tǒng)的硬件實(shí)現(xiàn)
　　輪胎檢測(cè)模塊采用鋰亞電池供電，SP12的喚醒信號(hào)向單片機(jī)提供外部中斷,定時(shí)喚醒單片機(jī)工作。通過(guò)SPI接口與nRF9E5實(shí)現(xiàn)信號(hào)的采集與傳輸。其電路框圖如圖2所示。

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　　其中，狀態(tài)字節(jié)前6位分別用于確認(rèn)壓力、溫度、電壓值是否超標(biāo)、是否報(bào)警提示和啟動(dòng)GSM通信，剩余的2位用來(lái)確認(rèn)輪胎位置，加上前面的輪胎ID確認(rèn)，提高了系統(tǒng)的可靠性。
3.2 輪胎檢測(cè)模塊流程
　　整個(gè)模塊流程如圖3所示。當(dāng)汽車(chē)靜止時(shí)，傳感器每隔一段時(shí)間測(cè)試輪胎的壓力參數(shù)，如果氣壓正常，不發(fā)送數(shù)據(jù)，待機(jī)一段時(shí)間后繼續(xù)測(cè)試；如果氣壓異常，即輪胎遭到破壞時(shí)，數(shù)據(jù)采集后立即發(fā)送，所以，在靜止時(shí)，nRF9E5大部分時(shí)間處于待機(jī)模式；當(dāng)汽車(chē)進(jìn)入行駛狀態(tài)時(shí)，通過(guò)檢測(cè)輪胎的氣壓來(lái)決定發(fā)送輪胎信息的頻率。當(dāng)測(cè)量的壓力值正常時(shí)，每1 min發(fā)送一次數(shù)據(jù)；當(dāng)壓力值超標(biāo)時(shí)，進(jìn)入快速發(fā)送模式，立即發(fā)送數(shù)據(jù)，當(dāng)接收到返回的確認(rèn)幀信號(hào)后進(jìn)入休眠模式，否則，一直重發(fā)數(shù)據(jù)。

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　　當(dāng)中央監(jiān)控模塊接收到有效數(shù)據(jù)后進(jìn)行處理顯示，如數(shù)據(jù)異常，進(jìn)行報(bào)警。當(dāng)汽車(chē)遭到破壞而車(chē)主遠(yuǎn)離車(chē)輛時(shí)，報(bào)警并啟動(dòng)GSM模塊通信，及時(shí)通知車(chē)主，以便車(chē)主同時(shí)采取防范措施。
　　本文所設(shè)計(jì)的汽車(chē)胎壓監(jiān)測(cè)系統(tǒng)，不僅能全天候檢測(cè)輪胎狀況，進(jìn)行遠(yuǎn)程報(bào)警；而且整個(gè)系統(tǒng)在低功耗、穩(wěn)定性以及安全性方面具有一定的優(yōu)勢(shì)。系統(tǒng)提出的按鍵顯示輪胎定位方法，抗干擾性能高、操作簡(jiǎn)便、成本低廉，具有很高的實(shí)用價(jià)值。另外,系統(tǒng)還具有CAN網(wǎng)絡(luò)接口,采用GSM網(wǎng)絡(luò)進(jìn)行遠(yuǎn)程防盜報(bào)警，符合未來(lái)汽車(chē)車(chē)載網(wǎng)絡(luò)發(fā)展和智能車(chē)輛研究的發(fā)展趨勢(shì)。

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