一、前言 在寒冷的冬天,拖拉机的顺利起动,是保证正常使用的首要条件。低温起动试验的目的,就是确定拖拉机能够正常起动的最低气温,即确定它的极限冷起动温度。 目前,不用任何辅助起动措施时,国外柴油机的极限冷起动温度一般在0～-15℃。采用辅助起动措施后,可以在更低的温度下顺利起动。例如,采用较好的进气预热装置、 First, the preface In the cold winter, the smooth start of the tractor, is to ensure the normal use of the primary conditions. The purpose of the low temperature start-up test is to determine the minimum temperature at which the tractor will normally start, ie to determine its ultimate cold start temperature. At present, without any auxiliary starting measures, the extreme cold start temperature of foreign diesel engines is generally 0 ~ -15 ℃. Auxiliary starting measures, you can smooth start at a lower temperature. For example, the use of better air intake preheating device,