What is the function of the automobile intake manifold pressure sensor?
2 Answers
The function of the automobile intake manifold pressure sensor is equivalent to that of an air flow meter, mainly used to measure the amount of air entering the engine. Here is some relevant information about the automobile intake manifold pressure sensor: 1. Description: The intake manifold pressure sensor, abbreviated as MAP, is a key component of the D-type fuel injection system in gasoline engines. 2. Working principle and explanation: It determines the air density by measuring the absolute pressure in the intake pipe and, in conjunction with the engine speed, calculates the amount of air entering. It should be noted that in ordinary engines, the manifold between the throttle valve and the intake valve is generally in a vacuum state, except for turbocharged engines. The intake power of a standard gasoline engine comes from the suction of the piston, meaning the piston end is the active side, while the throttle valve is normally closed. This creates a situation where demand exceeds supply, resulting in a vacuum in the manifold.
As an ordinary car owner, I've experienced sensor failure before. This pressure sensor is installed near the intake port, primarily monitoring the pressure of the engine's air intake. When the car is running, changes in air volume affect the air-fuel mixture ratio. The sensor transmits data to the computer, which then adjusts the fuel injector's output to ensure more uniform and efficient engine combustion. If it fails—due to aging or carbon buildup, for example—the car may experience rough idling, poor acceleration, and significantly increased fuel consumption. I remember discovering this issue during a long-distance trip when the engine light came on the dashboard, prompting me to visit a repair shop immediately. The mechanic used a diagnostic tool to read the fault code, confirmed it was a sensor issue, and replaced it with a new one. The car ran much smoother right away. For regular maintenance, it's advisable to pay attention to the engine bay to prevent dust and grime buildup, extending the sensor's lifespan.
