The automatic transmission hydraulic control unit (hydraulic unit) is a complex component responsible for controlling the flow of pressurized fluid in an automatic transmission (automatic transmission).
Valve block functions:
* Gear Selection: The valve body directs pressurized fluid to the shift solenoids, which activate the appropriate clutch packs to engage the desired gear.
* Pressure adjustment: The valve body regulates the fluid pressure in the automatic transmission using special valves and throttles, ensuring smooth gear changes and sufficient traction.
* Pressure Modulation: The valve body modulates fluid pressure depending on engine load, vehicle speed and other factors to optimize transmission performance.
* Fluid Filter: The valve body typically contains an automatic transmission fluid filter that traps contaminants and protects transmission components.
* Fluid Flow Control: The valve body directs transmission fluid through a complex system of passages and valves to control various transmission functions.
The valve body is a critical component of the automatic transmission and requires regular maintenance, including changing the automatic transmission fluid and filter. Valve body failures can lead to shifting problems, fluid leaks, and other serious transmission problems.