Electrohydraulic unit (EGB) automatic transmission
Purpose:
The EGB is an important component of an automatic transmission and performs the following functions:
* Provides hydraulic pressure to the clutches and clutches that change gears.
* Regulates the volume and pressure of hydraulic fluid, which is necessary for smooth gear shifting.
* Controls the operation of solenoids that activate or deactivate certain channels in the hydraulic system.
Device:
EGB usually consists of the following components:
* Housing: Contains all internal components of the EGB.
* Hydraulic part: Contains channels, valves and plungers that direct and regulate the flow of hydraulic fluid.
* Electronics: Contains solenoids, sensors and an electronic control unit (ECU) that processes input signals and controls the solenoids.
Working principle:
The EGB works as follows:
1. The ECU receives signals from sensors (for example, speed sensor and throttle position sensor).
2. The ECU interprets the signals and determines what pressure and volume of hydraulic fluid is needed to change gears.
3. The ECU activates the appropriate solenoids.
4. Solenoids direct hydraulic fluid to the correct passages.
5. Hydraulic pressure acts on the clutches and clutches to change gears.
Types of EGB:
There are two main types of EHD:
*Hydromechanical: Uses mechanical valves and solenoids to control hydraulic pressure.
* Mechatronic: Uses electronic components (such as ECUs and computer-controlled solenoids) to control hydraulic pressure.
EGB malfunctions:
Common EGB faults include:
* Clogged or dirty passages: Prevents normal flow of hydraulic fluid.
* Failed solenoids: Cannot control hydraulic pressure properly.
* Faulty ECU: Cannot interpret input signals or control solenoids correctly.