中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2014年
9期
1268-1272
,共5页
龚金科%颜胜%黄张伟%贾国海
龔金科%顏勝%黃張偉%賈國海
공금과%안성%황장위%가국해
发动机%辅助制动%制动扭矩%排气背压
髮動機%輔助製動%製動扭矩%排氣揹壓
발동궤%보조제동%제동뉴구%배기배압
engine%supplementary brake%brake torque%exhaust back pressure
通过对发动机辅助制动工作过程进行理论分析,建立了发动机辅助制动计算模型,根据辅助制动相关参数(包括排气门开度、发动机转速和排气背压等),对发动机辅助制动进行了单因素和多因素条件下的仿真研究及试验验证。结果表明:随着发动机转速的升高,缸内压力增大,且压力峰值更靠近上止点;制动扭矩随转速的升高而增大,减压制动时制动扭矩最大,发动机制动时制动扭矩最小;发动机转速一定时,泄漏制动和减压制动分别有一对应的最佳排气门开度值,并且转速越高,排气门开度最佳值越大,排气背压越高,制动扭矩越大。
通過對髮動機輔助製動工作過程進行理論分析,建立瞭髮動機輔助製動計算模型,根據輔助製動相關參數(包括排氣門開度、髮動機轉速和排氣揹壓等),對髮動機輔助製動進行瞭單因素和多因素條件下的倣真研究及試驗驗證。結果錶明:隨著髮動機轉速的升高,缸內壓力增大,且壓力峰值更靠近上止點;製動扭矩隨轉速的升高而增大,減壓製動時製動扭矩最大,髮動機製動時製動扭矩最小;髮動機轉速一定時,洩漏製動和減壓製動分彆有一對應的最佳排氣門開度值,併且轉速越高,排氣門開度最佳值越大,排氣揹壓越高,製動扭矩越大。
통과대발동궤보조제동공작과정진행이론분석,건립료발동궤보조제동계산모형,근거보조제동상관삼수(포괄배기문개도、발동궤전속화배기배압등),대발동궤보조제동진행료단인소화다인소조건하적방진연구급시험험증。결과표명:수착발동궤전속적승고,항내압력증대,차압력봉치경고근상지점;제동뉴구수전속적승고이증대,감압제동시제동뉴구최대,발동궤제동시제동뉴구최소;발동궤전속일정시,설루제동화감압제동분별유일대응적최가배기문개도치,병차전속월고,배기문개도최가치월대,배기배압월고,제동뉴구월대。
A mathematical model of the engine supplementary brake was set up through discussing the working processes of engine supplementary brake.According to reference parameters of the sup-plementary brake (including the exhaust valve lash,engine speed,exhaust back pressure,etc.),the engine supplementary brake was analyzed with univariate and multivariate conditions by the method of numerical simulations and experimental tests.The results show that the cylinder pressure increases with speed and the peak pressure phase is more near the top dead center(TDC)under the higher speed conditions.The brake torque increases with the engine speed increase.The de-compressure brake has a maximum brake torque while the engine brake has the minimum brake torque.When the engine speed is constant,the bleeding brake and the de-compressure brake have a corresponding optimal ex-haust valve lash,respectively.The higher the speed is,the bigger the exhaust valve lash is.The higher the exhaust back pressure is,the more the brake torque is.