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Brand: C.OEFT
OE numbers:28250-P6H-024
EAProduct Name: Transmission Valve
Compatible model:28250-P6H-004
Product status: New
Product weight:0.500KG
Packaging size: 13.5X13.5X8 cm
Product packaging:Neutral Package
Car Series:Japanese
Car Type: for Honda
1. Torque Converter Clutch (TCC) Control: Improving Transmission Efficiency
A key function of the 28250-P6H-024 solenoid valve is to control the engagement and disengagement of the Honda transmission's torque converter clutch, which is crucial for reducing fuel consumption and improving driving comfort:
Smooth TCC Engagement: At speeds above 60km/h (highway driving), the TCU sends a PWM signal to the solenoid valve, which gradually increases the oil pressure applied to the TCC. The solenoid valve adjusts the pressure in 0.02bar increments, ensuring the TCC engages smoothly without "judder" (a common issue with low-precision solenoid valves). This eliminates slip between the torque converter's pump wheel and turbine wheel, increasing transmission efficiency by 8-12%;
Intelligent TCC Disengagement: During deceleration or low-speed driving (below 30km/h), the solenoid valve quickly reduces the TCC oil pressure, disconnecting the clutch to avoid engine stalling. In Honda's "Eco Mode," it can also delay TCC engagement appropriately to prioritize ride comfort, while in "Sport Mode," it accelerates engagement to enhance power response.
2. Shift Solenoid Control: Ensuring Precise Gear Changes
As a core shift execution component, the 28250-P6H-024 solenoid valve works with Honda's TCU to control the engagement and disengagement of the transmission's planetary gear set clutches and brakes:
Pressure Regulation for Gear Shifts: During upshifts (e.g., from 2nd to 3rd gear) or downshifts (e.g., from 5th to 3rd gear during overtaking), the solenoid valve adjusts the oil pressure of the target clutch/brake according to the TCU's load calculation. For example, during a full-throttle downshift, it increases the brake oil pressure to 8-10bar in 0.05 seconds, ensuring the gear changes within 0.3 seconds (faster than the industry average of 0.5 seconds);
Adaptive Shift Compensation: For older Honda vehicles (with over 150,000 kilometers), the solenoid valve can compensate for clutch plate wear by increasing the oil pressure by 0.5-1bar (based on TCU feedback of shift time). This restores the original shift feel, avoiding issues such as "soft shifts" or "late shifts" caused by wear.
1. Vehicle-Specific Precision Matching for Honda Transmission Systems
The 28250-P6H-024 solenoid valve is developed based on Honda's proprietary transmission hydraulic control logic, achieving 100% compatibility with the original factory TCU communication protocol. Unlike universal solenoid valves, it is calibrated for Honda's engine torque output characteristics and transmission gear ratio design: for example, in Honda's K-series engine matching models, it can accurately respond to the TCU's pressure adjustment commands within 0.08 seconds during rapid acceleration, avoiding the "delayed shift" issue common in non-original components. Additionally, its interface size (including oil port diameter of 6.2mm and mounting hole spacing of 28mm) fully aligns with Honda's transmission valve body specifications, eliminating the need for secondary modification and ensuring a seamless fit with the original system.
2. Enhanced Environmental Adaptability for Complex Working Conditions
Targeting Honda's vehicle application scenarios (including high-temperature tropical regions and low-temperature cold areas), this solenoid valve features an optimized environmental resistance design:
Wider Temperature Adaptation Range: The electromagnetic coil uses high-temperature resistant enameled wire (rated temperature class 180℃) and a heat-dissipating aluminum alloy shell, enabling stable operation in extreme temperatures from -45℃ to 160℃—10℃ wider than the industry average low-temperature resistance range. This ensures reliable shifting performance even for vehicles used in cold northern winters or high-temperature southern summers;
Superior Contamination Resistance: Equipped with a double-layer stainless steel filter screen (filtering precision of 20μm) at the oil inlet, it effectively intercepts metal shavings and sludge generated by transmission wear. The filter screen can be disassembled and cleaned independently, reducing the risk of valve core jamming caused by oil contamination by over 70% compared to solenoid valves without filters;
Waterproof and Moisture-Proof Design: The electrical connector adopts IP67-level waterproof sealing technology, with a fluororubber O-ring that resists aging from transmission oil and coolant. It can prevent water intrusion even in harsh environments such as wading or car washing, avoiding short circuits in the electromagnetic coil.
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