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Chapter 3 Automotive Test
53
3.2 Sensor Tests
The sensor is an electronic signal conversion device that converts non-electrical information into voltage signals
and reports various information about changes in the working environment to the car computer. For example, the air
flow meter installed between the air filter and the throttle valve can measure the value of the air flow that is sucked
into the engine through the throttle valve. It converts the air flow value into a voltage signal and sends it to the
engine ECU (control computer), the control computer adjusts the corresponding fuel injection volume according to
the change of air flow to achieve the goal of the best combustion ratio. Another example is a vehicle speed sensor.
Its function is to convert the vehicle speed into a voltage signal and send it to the trip computer. The trip computer
controls the shift timing to achieve upshift or downshift.
With the continuous development of cars in the direction of intelligence and new energy, the number of sensors on
the car body has shown a trend of sharp increase, and there are nearly 100 sensors on the mid-to-high-end cars of
the company. The ATO series special oscilloscope can directly measure the signal waveform of the sensor. By
comparing with the standard waveform during normal operation, it is easy to find whether the sensor is normal. The
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