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在汽车电子及电器系统中,蓄电池负极电缆通过金属车身或悬架作为搭铁线,承担用电设备电流回路作用,且保证了用电设备电源相对于一个共同的参考点有正极12 V电压。如图1所示,丰田汽车发动机电控单元(ECU)包含以下3种基本搭铁电路:E1端子是发动机ECU搭铁端子,通常与发动机进气室相连;E2和E21端子是传感器搭铁端子,与ECU内部电路中的E1相连,使传感器搭铁电位与发动机ECU搭铁电位有相同值,防止传感器探测电压值的
In the automotive electronics and electrical systems, the battery negative cable through the metal body or suspension as a ground wire, bear the current loop of the electric equipment, and to ensure that the power supply with respect to a common reference point with a positive 12 V voltage. As shown in Figure 1, the TOYOTA ECU includes the following three basic ground circuits: E1 terminal is the engine ECU ground terminal, usually connected to the engine intake chamber; E2 and E21 terminals are sensor ground terminals , Connected with the E1 in the ECU internal circuit, so that the sensor ground potential and the engine ECU ground potential have the same value to prevent the sensor to detect the voltage value