Accumulator Control Valve A

Accumulator Control Valve A

Outline
^ Accumulator control valve A reduces line pressure according to the throttle pressure and adjusts to the accumulator control valve. The accumulator control pressure is applied to the low clutch accumulator and increases the line pressure at optimal timing according to the driving conditions.

Operation
^ Spring force and throttle pressure (11) are applied to the bottom end of the valve and push the valve upward. Conversely, accumulator control pressure (21) is applied to the top end of the valve and pushes the valve downward.
^ Accumulator control pressure (21) and throttle pressure (11) maintain the balance. By this balance line pressure (8) is depressurized and adjusted to accumulator control pressure (21). When accumulator control pressure (21) is lower than the throttle pressure, the valve moves upward and opens line pressure (8) oil passage (See figure). This causes the line pressure to flow through oil passage (8) to oil passage (21) and pressurizes accumulator control pressure (21). Pressurized accumulator control pressure (21) moves the valve downward and closes line pressure (8) oil passage. This causes the accumulator control pressure to not pressurize.
^ When accumulator control pressure (21) is higher than throttle pressure (11), the valve moves downward and opens drain port (X). This causes accumulator control pressure (21) to depressurize. When accumulator control pressure (21) is depressurized, the force to push the valve downward is less, the valve moves up and drain port (X) closes. This causes accumulator control pressure to not depressurize. Thus, accumulator control pressure (21) is adjusted according to throttle pressure (11).