What is the function of throttle body?

The throttle body of Pacific Auto Network is used to control the intake flow of the engine. Throttle is a controllable valve, which controls air to enter the engine and determines the working conditions of the engine. After the air enters the intake pipe, it is mixed with gasoline (the mixing parts of different models of cars are different) to become combustible mixture, which participates in combustion and does work. The driver controls the throttle opening by operating the accelerator pedal.

From: Engine Oil Forum Yun Dan _ The wind is light. The accelerator we are talking about is actually the accelerator, which is controlled by the accelerator pedal.

Used to adjust the air intake.

At present, there are two main types: one is mechanical.

Step on the accelerator pedal and open and close the accelerator by driving the steel cable connected to the accelerator under the pedal.

This structure is being phased out.

The latest is the electronic throttle. There is no traditional cable connection between accelerator pedal and accelerator, but it is controlled by electronic sensor, which has higher control accuracy and improves accelerator hysteresis.

The role of the throttle The role of the throttle is to control the intake flow of the engine and the air entering the engine. It is a controllable valve and determines the working condition of the engine. After air enters the intake pipe, it is mixed with gasoline (different types of cars have different design mixing parts) to become combustible mixture, which participates in combustion and does work. The driver controls the throttle opening by operating the accelerator pedal.

Whether it is a carburetor car or an EFI car, the function of the throttle is the same, that is, to control and adjust the air intake of the engine. After air enters through the throttle, it is mixed with gasoline to form an oil-gas mixture.

The fuel injection of carburetor model is to suck the gasoline in the carburetor through the negative pressure formed by the airflow in the intake pipe, and then mix it and enter the cylinder.

This method is extensive and unevenly distributed, which affects emissions.

On the other hand, the electronic signals provided by the air flow sensor and air pressure sensor near the throttle valve are used by the EFI vehicle, and the fuel injector in the intake manifold is controlled by the driving computer to inject fuel according to various parameters.

Therefore, the intake of air determines the intake of air-fuel mixture. From this perspective, the opening of throttle valve also determines the intake of air-fuel mixture.

The role of the throttle The ordinary throttle is controlled by the throttle cable, which consists of the valve position sensor and the stepping motor. Idle speed is controlled by stepping motor. When refueling, the throttle position sensor rotates (it is a variable resistor), changes its resistance value, and then outputs a variable voltage signal to ECU. In order to control the opening and closing of the accelerator by stepping on the accelerator pedal, a linkage device is needed between the accelerator pedal and the accelerator. This device is the cable.

The traditional cable accelerator is connected with the accelerator pedal at one end and the throttle valve at the other end through a steel wire, and its transmission ratio is 1: 1, that is to say, the opening of the throttle valve is how much we step on it with our feet.

The traditional throttle adopts rigid connection, that is, the mechanical connection between the throttle pedal and the throttle is driven by a pull rod or a cable, so the throttle opening depends entirely on the position of the throttle pedal, that is, the driver's operation intention. However, from the perspective of power and economy, the engine is not always in the best running state, and the driver's misoperation also brings hidden dangers to safety.

In the hybrid electric vehicle, because the engine and battery constitute a multi-energy power system, the rigid connection mode can not realize each power source.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)