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The working principle of idle speed motor

2024-07-15

The 4 working states of the idle speed motor itself: under the control of the engine ECU, it can be divided into 4 working states.
State 1: The stator coil AB is energized (CD is de-energized), and the current flows from A to B. According to the electromagnetic induction rate, the direction of the generated magnetic field is N pole on the left and S pole on the right. Because the rotor is a permanent magnet, the rotor will be attracted to a horizontal state by the magnetic field generated by the stator coil, and the left electrode is S, the right electrode is N.
State 2: The stator coil CD is energized (AB is de-energized), and the current flows from C to D. At this time, the direction of the magnetic field generated by the stator coil is N pole on the upper side and S pole on the lower side. When the rotor is attracted by the magnetic field generated by the stator coil, it rotates 90 degrees clockwise from the horizontal state just now to the vertical state, and the upper electrode is S and the lower electrode is N.
In state 3, the stator coil AB is energized (CD is de-energized), and the current flows from B to A. At this time, the direction of the generated magnetic field is the left S pole and the right N pole. The rotor will be attracted to rotate clockwise 90 degrees from the vertical state to the horizontal state, and the left electrode is N and the right electrode is S.
In state 4, the stator coil CD is energized (AB is de-energized), and the current flows from D to C. At this time, the direction of the generated magnetic field is the upper S pole and the lower N pole. The rotor will be attracted to rotate clockwise 90 degrees from the horizontal state to the vertical state, and the upper electrode is N and the lower electrode is S.
In the above four states, according to the cycle of the above sequence, the rotor of the idle speed motor is driven to rotate in the clockwise direction. Through the screw mechanism, the valve core is gradually pushed out to reduce the engine air intake and then reduce the engine speed. Similarly, if the pulse signal sequence sent by the engine ECU is reversed, that is, the state 4. 3. 2. one in turn, the valve core of the idle speed motor is retracted, so the engine idle speed increases.

2025-05-06

Throttle position sensor technology has undergone significant evolution since its introduction in early fuel injection systems. Early potentiometer-style sensors used a wiper arm moving across a resistive track, which proved susceptible to wear and contamination over time. Modern non-contact designs utilizing Hall effect or magnetoresistive principles eliminate mechanical wear points while providing greater accuracy and longevity. These advanced sensors can detect throttle position changes as small as 0.1 degree, enabling more precise engine control than ever before.

Replacing Faulty Throttle Position Sensors

2025-04-28

Identifying a failing throttle position sensor requires systematic diagnostic procedures to distinguish it from other potential engine issues. Technicians typically begin with a visual inspection of the sensor and wiring harness for obvious damage or corrosion, followed by voltage measurements using a digital multimeter or oscilloscope. The sensor should produce a smooth, linear voltage change from about 0.5V at closed throttle to 4.5V at wide-open throttle (WOT) without any erratic fluctuations or dead spots in the sweep.

Throttle Position Sensor is the Engines Vital Communication Link

2025-04-24

The throttle position sensor (TPS) serves as a critical interface between a driver's input and engine management systems in modern vehicles. Mounted on the throttle body shaft, this electronic sensor precisely measures how far the throttle plate opens when the accelerator is pressed. It converts mechanical movement into voltage signals that the engine control unit (ECU) interprets to adjust fuel injection, ignition timing, and transmission shifting. Modern TPS units typically use either potentiometer-based or non-contact Hall effect technology, each offering distinct advantages in accuracy and durability.

The Role of the Throttle Position Sensor in Fuel Efficiency

2025-04-18

The Throttle Position Sensor (TPS) plays a significant role in improving fuel efficiency by helping the Engine Control Unit (ECU) manage the air-fuel mixture more effectively. By monitoring the throttle valve's position, the TPS provides the ECU with precise data on how much air is entering the engine. This allows the ECU to adjust the fuel injection accordingly, ensuring the engine runs at its most efficient level under all driving conditions.

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Address: Wudu Machinery Return Pioneer Park, Xiushui County, Jiujiang City, Jiangxi Province

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