Hydraulic Control

Hydraulic Control:

GENERAL
The valve body includes the main valve body, the regulator valve body, the throttle valve body, the secondary valve body, the servo body and 1st/2nd accumulator body. The ATF pump is driven by splines on the right end of the torque converter which is attached to the engine. Fluid flows through the regulator valve to maintain specified pressure through the main valve body to the manual valve directing pressure to each of the clutches. The shift control solenoid valves A/B and the lock-up control solenoid valves A/B are bolted on the outside of the torque converter housing.





MAIN VALVE BODY
The main valve body houses the manual valve, the 1-2 shift valve, the 2-3 shift valve, the lock-up control valve, the lock-up shift valve, the cooler relief valve, the modulator valve, the clutch pressure control (CPC) valve, and the main orifice control valve. The primary functions of the main valve body are to switch fluid pressure on and off and to control the hydraulic pressure going to the hydraulic control system.





REGULATOR VALVE BODY
The regulator valve body is located on the main valve body. The regulator valve body consists of the regulator valve, the torque converter check valve, and the lock-up timing valve.





REGULATOR VALVE
The regulator valve maintains a constant hydraulic pressure from the ATF pump to the hydraulic control system, while also furnishing fluid to the lubricating system and torque converter. The fluid from the ATF pump flows through B and B'. The regulator valve has a valve orifice. The fluid entering from B flows through the orifice to the A cavity. This pressure of the A cavity pushes the regulator valve to the right side, and this movement of the regulator valve uncovers the fluid port to the torque converter and the relief valve. The fluid flows out to the torque converter, and the relief valve and regulator valve moves to the left side. According to the level of the hydraulic pressure through B. the position of the regulator valve changes and the amount of the fluid from B' through D and C also changes. This operation is continued, maintaining the line pressure.





STATOR REACTION HYDRAULIC PRESSURE CONTROL
Hydraulic pressure increases according to torque are performed by the regulator valve using the stator torque reaction. The stator shaft is splined with the stator in the torque converter, and its arm end contacts the regulator spring cap. When the vehicle is accelerating or climbing (Torque Converter Range), the stator torque reaction acts on the stator shaft, and the stator arm pushes the regulator spring cap in the direction of the arrow in proportion to the reaction. The stator reaction spring compresses, and the regulator valve moves to increase the line pressure which is regulated by the regulator valve. The line pressure reaches its maximum when the stator torque reaction reaches its maximum.





SECONDARY VALVE BODY
The secondary valve body is located on the main valve body. The secondary valve body houses the servo control valve, the orifice control valve, the 2nd orifice control valve, the 4th exhaust valve, the 3-4 shift valve, and the 3rd kick-down valve.





THROTTLE VALVE BODY
The throttle valve body is located on the regulator valve body. The throttle valve body contains the throttle valve B. the throttle long valve and the relief valve.





SERVO BODY
The servo body is located on the secondary valve body. The servo valve is integrated with the shift fork shaft, the 3rd accumulator piston, the 4th accumulator piston and the 1st-hold accumulator piston, which are all assembled in the servo body.





1ST/2ND ACCUMULATOR BODY
The 1st/2nd accumulator body is located on the torque converter housing beside the main valve body. This body contains the 1st and 2nd accumulator pistons.