Throttle position sensor. Free Technical Library article

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Throttle position sensor

Free technical library

Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic fuel injection

Comments on the article

The throttle position sensor is required in the system for accurate fuel metering. Based on the TPS signal, the controller determines the current position of the throttle valve, the rate of change of the signal monitors the dynamics of pressing the accelerator pedal, which in turn is a determining factor for accurate fuel metering. In the engine start mode, the controller monitors the throttle angle and, if the throttle is open more than 75%, it switches to the engine purge mode. On the TPS signal of the throttle end position (<0.7V), the controller starts to control the idle speed controller (IAC) and, thus, provides additional air to the engine bypassing the closed throttle.

The throttle position sensor is a potentiometric type sensor (see photo-1) and includes a single turn variable and fixed resistors. Their total resistance is about 8 kOhm. A reference voltage (5V) is supplied from the controller to one of the extreme terminals of the potentiometer, and the other terminal is connected to ground.

From the middle output of the potentiometer, through a resistor, a signal is sent to the controller about the current throttle position. The value of this signal with a voltage less than 0.7V is perceived as a fully closed throttle. If this voltage is more than 4V, the control unit considers that the throttle valve is fully open.

TPS is mounted on the throttle body (see Photo-2) and is connected to its axis of rotation.

The throttle valve axis has a special groove, which enters the cross-shaped socket of the throttle position sensor (see photo 3 and photo 4).

The TPS is fixed with two screws. Installing the sensor on its seat should be offset (see photo 5) and through a protective gasket in the form of a ring.

After installing the TPS, it must be turned until the mounting holes of the sensor itself are aligned with the holes on the damper body and fixed with screws. It is easier to set the initial position of the sensor directly on the car. After installing the TPS, connect the sensor connector (with the ignition off), turn on the ignition and check the voltage at the signal output. The voltage value must be less than 0.7V. If it is higher, orient the sensor to the desired value by loosening the fixing screws. If the self-diagnosis system detects errors in the throttle position sensor, codes "21" or "22" will be written to the error RAM buffer, and if there is a permanent error, the "CHECK ENGINE" lamp lights up.

It should be borne in mind that these codes only indicate errors in the throttle position sensor circuit and do not always indicate a malfunction of the sensor itself, but only determine the direction of troubleshooting. When a TPS error is fixed, the controller switches to injection control according to the emergency program and calculates the current throttle position using the sensor crankshaft position and sensor mass air flow. Typical malfunctions of the circuit and the throttle position sensor include the following symptoms: 1. Uneven engine speed at idle. 2. Stopping the engine with a sharp reset of the accelerator pedal. 3. Limiting the maximum engine power. 4. Jerks when driving with a constant throttle opening angle.

TPS malfunctions

Publication: cxem.net

See other articles Section Automobile. Electronic fuel injection

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive

Miniature Tissue Fluid Sensor for Wearable Electronics 21.06.2014

Patients who resort to expensive and relatively time-consuming procedures for laboratory analysis of tissue fluid, in the future, will be able to use a wearable device that quickly and painlessly analyzes the balance of electrolytes in body tissues.

Such devices will be useful to athletes involved in sports related to endurance, as well as military personnel, since they can be used to quickly receive data on the physical condition and take the necessary measures in time to improve performance. In the human body, solutions of potassium, calcium, magnesium and other electrolytes play a key role in the passage of nerve impulses that control the work of the heart and other muscles.

The tissue fluid sensor prototype was designed and built by the Sandia National Laboratory. A sensor that can detect the levels of various electrolytes in tissue fluid can be installed in a watch-sized device.

Since a non-invasive method for analyzing tissue fluid cannot be feasible, it is necessary to penetrate into the tissues. In the case of using the new sensor, this task was assigned to microneedles that do not injure the nerves, so the procedure is painless. Because the interstitial fluid is analyzed, the intervention is non-destructive and the transducer is suitable for long-term wear.

The developers believe that such sensors of this type are the future of personalized healthcare. They are confident that the development will definitely reach the commercialization stage.

News feed of science and technology, new electronics

We recommend downloading in our Free technical library:

▪ site section Regulators of current, voltage, power

▪ magazines Modeler-constructor (annual archives)

▪ book pocket radios. Rakhteenko A.M., 1952

▪ article How much does the atmosphere weigh? Detailed answer

▪ article Reflex radio receiver. Encyclopedia of radio electronics and electrical engineering

▪ article Turn counter for winding a transformer using a computer LPT port. Encyclopedia of radio electronics and electrical engineering

▪ reference Entering the foreign TV service mode. Book #34

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews