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1.启动电路推土机发动机启动电路由蓄电池组、启动继电器、启动机、电源开关、点火开关等部件组成,如图1所示。推土机发动机启动时,点火开关闭合,发动机ECU接口得电,启动继电器开关闭合,蓄电池组输出的电流带动启动机旋转,实现发动机启动。以康明斯175 kW发动机启动机为例,其最大启动功率为9k W。该发动机启动时,蓄电池组电压降至18V以下,回路电流可达900A。发动机的启动电阻,是指从蓄电池组至启动机之间正、负回路中的电阻之和。为使
1. Startup circuit Bulldozer engine starting circuit from the battery pack, start the relay, starter, power switch, ignition switch and other components, as shown in Figure 1. When the bulldozer engine starts, the ignition switch is closed, the engine ECU interface is energized, the relay switch is closed, the current output by the battery pack drives the starter to rotate, and the engine starts. Take Cummins 175 kW engine starting machine as an example, its maximum starting power is 9kW. When the engine starts, the battery pack voltage drops below 18V, the loop current up to 900A. The starting resistance of the engine, is the sum of the resistance in the positive and negative circuits from the battery pack to the starter. To make