介紹了一種快速、簡便地確定內燃機缸內工作過程循環變動的方法——瞬時轉速法, 闡述了它的原理并給出了應用實例。瞬時轉速的測量采用雙傳感器法, 闡明了其結構及工作原理, 并對其測量精度進行分析。提出了利用瞬時轉速確定內燃機循環變動的兩種參數。將利用瞬時轉速法估計的結果同利用氣缸壓力確定的結果進行比較, 結果表明, 瞬時轉速法確定內燃機的缸內工作過程循環變動是簡便、可行的。
敘詞: 內燃機　瞬時轉速　測定　方法
AbstractA qu ick and simp lem ethod of determ in ing the cyclic variab ility of wo rk ing p rocess in in ternal com bu st ion engines w as in t roduced, that is, t ran sien t speed m ethod, and it s p rincip le and actual app licat ion s w ere described. The t ran sien t speed w asm easu red by dual sen so rsm ethod, of w h ich the st ructu re and con st itu t ion w ere described and the m easu rem en t accu racy w as analyzed. Two k inds of param eters to determ ine the cyclic variab ility w ere given. The resu lt s f rom t ran sien t speed w ere compared w ith tho se f rom cylinder p ressu re, w h ich show ed that it is simp le and feasib le to determ ine the cyclic variab ility of wo rk ing p rocess w ith t ran sien t speed.
Key words　In ternal com bu st ion engines, T ran sien t speed, Determ inat ion, M ethods