2.9 可变电阻对于燃用含铅汽油的汽车,用来进行感测空燃比稀浓的不是氧传感器,而是可变电阻。可变电阻固定于右减振器上方(从车前向后看,见图31)。可变电阻供手动调整怠速混合气用,当可变电阻轴转动时,输出电压改变,电子控制装置根据此信号进行燃油喷射率控制(图32)。图33为可变电阻的电路连结。 2.9 Variable resistance For vehicles with leaded gasoline, the sensor used to sense the lean air-fuel ratio is not an oxygen sensor but a variable resistor. The variable resistor is fixed above the right shock absorber (looking back from the front of the car, see Figure 31). The variable resistor is used to manually adjust the idle mix. When the variable resistance shaft rotates, the output voltage changes. The electronic control unit controls the fuel injection rate based on this signal (Figure 32). Figure 33 shows the circuit of the variable resistor.