Accumulator Control Valve B

Accumulator Control Valve B

Outline
^ Accumulator control valve B reduces the line pressure according to the operation of the 2-4 brake solenoid valve and adjusts to the accumulator control pressure. The accumulator control pressure is applied to the 2-4 brake accumulator and increases the line pressure at optimal timing according to the driving conditions.

Operation
^ Spring force and 2-4 brake solenoid valve pressure (18) are applied to the bottom end of the valve and push the valve upward. Conversely, accumulator control pressure (22) is applied to the top end of the valve and pushes the valve downward.
^ Accumulator control pressure (22) and 2-4 brake solenoid valve pressure (18) maintain the balance. By this balance, line pressure (5) is depressurized and adjusted to accumulator control pressure (22). When accumulator control pressure (22) is lower than 2-4 brake solenoid valve pressure (18), the valve moves upward and opens line pressure oil passage (5) (See figure). This causes the line pressure to flow through oil passage (5) to oil passage (22) and pressurizes accumulator control pressure (22). Pressurized accumulator control pressure (22) moves the valve downward and closes line pressure (5) oil passage. This causes accumulator control pressure (22) to not be pressurized.
^ When accumulator control pressure (22) is higher than 2-4 brake solenoid valve pressure (18), the valve moves downward and opens drain port (X). This causes accumulator control pressure (22) to depressurize. When accumulator control pressure (22) is depressurized, the force to push the valve downward decreases, the valve moves upward and closes drain port (X). This causes accumulator control pressure (22) to not depressurize. Thus, accumulator control pressure (22) according to the change in the 2-4 brake solenoid valve pressure.