27200-PWR-013

1. Dual-Power Source Collaborative Oil Circuit Control for Seamless Hybrid Shifting

The 27200-PWR-013 solenoid valve adopts a hybrid-specific dual-oil-circuit interactive design (engine clutch control circuit + motor drive pulley control circuit for eCVT, and high-gear clutch control circuit for 10-speed AT) to achieve seamless coordination between the engine and motor in hybrid mode, as well as rapid gear shifting in high-end fuel models. When the TCU detects a working mode switch (e.g., switching from pure electric mode to hybrid mode in i-MMD system), it sends a high-precision frequency-modulated electrical signal to the solenoid valve’s coil. The coil generates a dynamically adjustable magnetic field with microsecond-level response, driving the spool to move axially in a segmented manner—this not only controls the engine clutch to engage at a gradient pressure (0.3-1.8 MPa) but also synchronously adjusts the motor pulley oil pressure to match the power output, ensuring no obvious jitter during mode switching.

For example, in a Honda Accord Hybrid (11th generation) equipped with the i-MMD hybrid system (compatible with the 27200-PWR-013 solenoid valve), when accelerating from 60 km/h to 90 km/h (triggering pure electric to hybrid mode switch), the TCU coordinates this solenoid valve to complete the engine clutch engagement and motor pulley pressure adjustment. The entire process takes merely 0.18 seconds, with a jerking amplitude of less than 3.5 m/s²—far below the industry average of 5 m/s² for hybrid models. When de-energized, the high-elasticity carbon fiber composite return spring (stiffness 16 N/mm) resets the spool in 8 ms, promptly closing the target oil circuit to prevent residual pressure from causing power source interference, thus ensuring stable transmission operation during frequent hybrid mode switching.

2. Intelligent Pressure Regulation for Complex Hybrid Working Conditions

A prominent functional advantage of the 27200-PWR-013 solenoid valve is its hybrid-optimized intelligent pressure regulation capability, which can balance hybrid efficiency, torque transmission, and driving comfort under diverse complex working conditions (pure electric driving, hybrid power output, regenerative braking, high-speed cruising). It adopts a closed-loop control mode with quadruple sensors (pressure sensor + oil temperature sensor + torque sensor + power source status sensor): the TCU adjusts the coil current duty cycle (0%-100%) in real time based on comprehensive parameters such as vehicle speed, engine/motor torque, battery SOC (State of Charge), and driving mode (Eco/Sport/Normal), controlling the clutch/pulley oil chamber pressure with an accuracy of ±0.04 MPa—meeting the high-performance requirements of Honda’s flagship hybrid models.

During pure electric low-speed driving (e.g., 30 km/h in urban areas), the solenoid valve maintains the engine clutch pressure at 0.1 MPa (disengaged) and the motor pulley pressure at 1.0-1.2 MPa, ensuring the motor drives the vehicle efficiently with minimal energy loss. In hybrid high-load output (e.g., accelerating from 0 to 100 km/h), it increases the engine clutch pressure to 1.8-2.2 MPa and the motor pulley pressure to 1.5-1.7 MPa, coordinating the dual-power output to transmit a maximum torque of 330 N·m without slipping. During regenerative braking (e.g., decelerating from 80 km/h to 40 km/h), the solenoid valve reduces the motor pulley pressure to 0.6-0.8 MPa, allowing the motor to switch to generator mode smoothly and recover energy with a efficiency of up to 85%. In high-temperature environments (ambient temperature above 40℃), it adjusts the oil pressure to 1.2-1.4 MPa, reducing clutch/pulley friction heat generation by 20% and preventing transmission overheating.