Micsig ATO1000 Series, Руководство пользователя

Страница: 32 / 219

Chapter 3 Automotive Test
29
Figure 3-9 Cranking Current
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
ATO series oscilloscope can test the following types of sensors. The purpose is to compare the real-time waveforms
with the standard waveforms to help users find problems. The following are expanded and explained separately: