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Automotive teaching equipment maintenance knowledge

Nov 12, 2021

The vehicle sensor is an input device of the computer system of the automobile teaching equipment. It converts various operating condition information such as vehicle speed, the temperature of various media, engine operating conditions, etc. during the operation of the car into electrical signals and outputs them to the computer so that the engine Best working condition. There are many sensors for automotive teaching equipment. When judging a sensor's failure, you should not only consider the sensor itself but the entire circuit where the failure occurs. Therefore, when looking for faults, in addition to the sensors, check the wiring harness, connectors, and related circuits between the sensors and the electronic control unit. Let's take a look at the main sensors on equipment.

Airflow sensor

The airflow sensor converts the sucked air into an electric signal and sends it to an electronic control unit (ECU) as one of the basic signals for determining fuel injection. According to different measuring principles, it can be divided into four types: rotary-wing airflow sensor, Karman vortex airflow sensor, hotwire airflow sensor, and hot-film air flow sensor. The first two are volume flow types and the latter two are mass flow types. Currently, there are mainly two types of hot-wire airflow sensors and hot-film airflow sensors.

Intake pressure sensor

The intake pressure sensor can measure the absolute pressure in the intake manifold according to the load state of the engine, and convert it into an electric signal and a speed signal to send to the computer together, as a basis for determining the basic fuel injection quantity of the injector. This pressure sensor is used in domestic Audi 100 cars (V6 engine), Santana 2000 cars, Beijing Cherokee (25L engine), Toyota Crown 3.0 car, etc. Currently widely used are semiconductor piezoresistive intake air pressure sensors.

"In foggy weather, the sight becomes worse and the road condition cannot be judged." Automotive trainers teachers said that drivers should control their speed and use lights reasonably, which can enhance driving safety.

Automobile training equipment teacher introduced that when the visibility is less than 500 meters and greater than 200 meters, the speed should be controlled within 80 kilometers; when the visibility is less than 200 meters and greater than 100 meters, the speed should be controlled within 60 kilometers; when the visibility is less than 100 meters and greater than 50 meters, The speed should be controlled at 40 kilometers per hour; when the visibility is within 30 meters, the speed should be controlled below 20 kilometers; when the general line of sight is about 10 meters, the speed should be controlled at about 5 kilometers per hour. If you can't see clearly even 10 meters away, it is recommended to drive to the roadside safety zone or parking lot in time, wait for the fog to clear or the visibility to improve before continuing on the road.