Electronic Control (Brake, Hydraulic Fan System)
输入
输入描述机器系统的状态。 有两种输入。 输入可以是开关型，也可以是传感器型。 各开关可向控制器输入装置提供开路、接地或蓄电池正极信号。 传感器（频率、脉冲宽度调制 (PWM) 或电压）将信号转变为控制器的传感器输入。
压力传感器
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| 图 1 | g03389651 |
制动器压力传感器/停车制动器压力传感器
制动器压力传感器通知机器控制 ECM 制动器系统压力。 压力传感器输出为脉冲宽度调制信号。 信号的工作负载循环会按照系统压力成比例变化。 这些 PWM 信号都属于机器控制 ECM 的输入。 机器控制 ECM 提供传感器的 8V 电源和 8V 回路。
停车制动器压力传感器通知机器控制 ECM 停车制动器系统压力。 压力传感器输出为脉冲宽度调制信号。 信号的工作负载循环会按照系统压力成比例变化。 这些 PWM 信号都属于机器控制 ECM 的输入。 机器控制 ECM 提供传感器的 8V 电源和 8V 回路。
位置传感器
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| 图 2 | g03389655 |
左侧踏板传感器
踏板位置传感器决定左侧制动踏板的位置。 传感器向 ECM 发送一个脉冲宽度调制 (PWM) 信号。 ECM 监视信号并根据信号计算踏板位置。
输出
按需运转风扇电磁阀
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| 图 3 | g03436816 |
风扇转速电磁阀为比例电磁阀，接收来自控制 ECM 的脉冲宽度调制 (PWM) 信号。 风扇转速电磁阀电流增加，输出压力降低；风扇转速电磁阀电流减小，输出压力提高。
Caterpillar Information System:
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