The other type of valve body is called the hydraulic valve body. This system works by using hydraulic pressure to control each valve that’s linked to the shifting lever. The controller of the transmission can monitor the throttle position, vehicle speed, anti-lock braking system, and the engine speed. This is what allows the transmission to have more elaborate and advanced control schemes than non-electronically controlled transmissions. However, an electric solenoid valve is used to control each hydraulic circuit. Many newer cars use this electronically controlled transmission (ECT) which has bands and clutches that are operated via hydraulics. The first type is the electronic valve body which uses the electronic system ECT (electronic controlled transmission) as its main control to operate all shifting on an automatic transmission.
For example, the valve body has a 2-3 shift valve which is responsible for up shifting from 2nd gear to 3rd gear.Īnd if there’s going to be a downshift from 4th gear to 3rd gear, then the 4-3 shift valve would be responsible for that. The valves that make up the valve body each serve a different purpose and their names reflect what they do. Think of each channel as a tumbler on a lock which has to perfectly line up so transmission fluid is directed where it should. See Also: What Transmission Does My Car Have? There are dozens of various passages and channels within the valve body which direct the flow of pressurized hydraulic fluid to different valves in order to activate the right clutch pack or band and shift to the most appropriate gear based on the current driving situation.
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