How the throttle position sensor works

Underneath the throttle valve is the throttle sensor.

Fully open contacts and idle contacts. When the throttle is in the idle position, the idle contact is closed, and the idle condition signal is output to the computer; When the throttle is in other positions, the idle contact is opened, and the voltage signal is output relative to the different angles of the throttle, and the computer will identify the load of the engine according to the signal voltage value; According to the change rate of signal voltage in a certain period of time, the increase or decrease rate is determined whether it is an acceleration or deceleration condition. Based on this information, the computer can be used to correct the amount of fuel injected or to control the oil cut-off.

By moving the throttle position, the resistance is increased or decreased, and the amount of current passed through is fed back to the computer, similar to the working principle of a fuel tank.

The principle of the throttle position sensor is actually a sliding rheostat, when the throttle is pressed, the idle signal line is disconnected, the sliding rheostat also rotates, the computer detects the voltage value, and the data obtained is compared and analyzed by the computer to control the basic fuel injection.

The function of the resistance plate of the throttle position sensor is to convert the position or opening of the throttle into a voltage signal, which is transmitted to the electronic control unit, which is used as the basis for the electronic control unit to judge the operating condition of the engine, and realizes the control of the amount of fuel injection under different throttle openings. There are three types of throttle position sensors: linear, switched, and integrated (with both switching and linear variable resistors). The throttle position sensor is installed on the throttle body, and the throttle is linked, and the resistance sheet of the throttle position sensor is a kind of sliding potentiometer inside, and the sliding contact of the potentiometer is driven by the throttle shaft, and the resistance value of the potentiometer is different for different throttle openings, so that the opening of the throttle is converted into a resistance or voltage signal and transmitted to the microcomputer.

Through the throttle position sensor, the microcomputer can obtain the analog signal representing the continuous change of all opening angles of the throttle from full closure to full opening, as well as the change rate of the throttle opening, so as to more accurately determine the operating condition of the engine and improve the control accuracy and effect. In order to accurately detect the signal in the idle condition (throttle fully off), the integrated throttle position sensor has an idle contact. When the throttle valve is fully closed, the idle output contact is turned on, and the sensor outputs an idle signal, at which point the electronic control unit instructs the injector to increase the amount of fuel injected to thicken the mixture.

Photo by Cao Bo) @2019

The principle of the throttle position sensor is actually a sliding rheostat. When the throttle is pressed, the idle signal line is disconnected and the sliding rheostat rotates with it. The computer detects the voltage value and compares and analyzes the obtained data through the computer to control the basic injection volume.

The function of the throttle position sensor resistance is to convert the position or opening of the throttle into a voltage signal, which is transmitted to the electronic control unit, which is used as the basis for the electronic control unit to judge the engine working condition, so as to realize the control of fuel injection under different throttle openings. There are three types of throttle position sensors: linear, switched, and integrated (switching and linear variable resistors).

The throttle position sensor is mounted on the throttle body and connected to the throttle. Inside the resistor of the throttle position sensor is a sliding potentiometer. The sliding contacts of the potentiometer are actuated by the throttle shaft.

Different throttle openings and potentiometers have different resistance values, which can convert the throttle opening into resistance or voltage signals and send them to the microcomputer. Through the microcomputer throttle position sensor, the analog signal representing the continuous change of all opening angles of the throttle from full closure to full opening can be obtained, as well as the rate of change of the throttle opening, so that the working condition of the engine can be judged more accurately and the control accuracy and effect can be improved. In order to accurately detect the signal of the idle state (throttle full open), the integrated throttle position sensor has an idle contact.

When the throttle is completely closed, the idle output contact is turned on and the sensor outputs an idle signal. At this point, the electronic control unit instructs the injector to increase the amount of fuel injected to thicken the mixture.

The function of the throttle position sensor is to detect whether the engine is in idle or load conditions, acceleration conditions, and deceleration conditions.

Throttle position sensors are also known as throttle opening sensors or throttle switches. Its main function is to detect whether the engine is in idle or load condition, acceleration or deceleration condition. It is essentially a variable resistor and several switches, which are mounted on the throttle body, and the shape and internal structure are shown in the figure below.

The throttle valve of a car engine is operated by the driver through the accelerator pedal to change the amount of air intake into the engine, thereby controlling the operation of the engine. Different throttle openings indicate different operating conditions of the engine.

How the throttle position sensor works

The shaft of the resistor is linked to the throttle, and it has two contacts: a fully open contact and an idle contact.

When the throttle is in the idle position, the idle contact is closed, and the idle working condition signal is output to the computer; When the throttle is in other positions, the idle contact is opened, and the voltage signal is output relative to the different angles of the throttle, and the computer will identify the load of the engine according to the signal voltage value; According to the change rate of signal voltage in a certain period of time, the increase or decrease rate is determined whether it is an acceleration or deceleration condition. Based on this information, the computer can correct the amount of sparrow oil or control the oil cut-off.

The purpose of the throttle position sensor is to detect whether the engine is in idle or load condition, acceleration or deceleration condition. Essentially a potentiometer and some switches, mounted on the throttle body, its shaft is connected to the throttle valve, and there are two contact points full open contact and idle contact.

Throttle features:When the throttle is in a different position, the idle contact opens, and the voltage information at different angles relative to the throttle is exported, and the computer can identify the load of the engine based on the information voltage value. According to the interval of the information voltage within a certain period of time, guess the increase and decrease rate, and identify whether it is a grip acceleration condition or a deceleration condition.

Based on this information, the computer can correct the amount of fuel injected or cut off the fuel, and it has two contacts, the no-load contact branch IDL and the full-load contact PSW. The cam coaxial with the throttle valve controls the opening and closing of the two switch contacts, and when the throttle is in the idle position, the idle contact is closed, and the idle work information is output to the computer.

The throttle valve of the car will be equipped with a position sensor, if the position sensor is damaged, it will affect the use of the vehicle, so what is the role of the throttle position sensor?

The throttle position sensor, also known as the throttle opening sensor, is commonly known as the throttle switch, which is a device used to detect the status of the engine. The main function of the throttle position sensor is to detect whether the engine is idle or loaded, and whether it is accelerating or decelerating. The throttle position sensor, which is essentially a variable resistor and switch, is installed on the throttle valve of the car, with two contacts, the fully open contact and the idle contact.

When the car is idling, the idle contacts are closed and the sensor signals the idle state to the computer, and if the car is in other states, the idle contacts open and the sensor sends other signals to the computer. Based on the signals sent by the sensors, the computer recognizes the load state of the engine and controls the amount of fuel injected in the car.