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徐松华同志的文章分析了“D”档位时Ⅱ、Ⅲ档的自动切换情况。当对整个自动变速器换档图(图1)进行分析,就可发现,不管司机将换档杆置于何档位,自动变速器都会出现“循环跳档”的现象。下面分析以“D”档位爬长坡时,Ⅰ、Ⅱ档的变化情况(“2”档位同此)。若发动机以大负荷运行(节气门开度一定,暂截取80%的开度值),而车速并不很高(假设为50km/h)时,随着上坡行驶阻力的增加,车
Comrade Xu Songhua’s article analyzes the automatic switching situation of the files “Ⅱ” and “Ⅲ” when the “D” gear is used. When the entire automatic transmission shift map (Figure 1) is analyzed, you can find, regardless of the driver will be placed in what gear shift lever, automatic transmission will appear “cycle jump file” phenomenon. The following analysis of the “D” stalls climb climbing, Ⅰ, Ⅱ file changes (“2” stalls with the same). If the engine runs at a heavy load (the throttle opening is fixed and the opening degree is 80%) and the vehicle speed is not very high (assuming 50km / h), as the resistance increases, the car