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Brand: C.oeft
OE numbers: K313
Product Name: Transmission Valve
Compatible model: K312
Product status: Remanufactured
Number of teeth on the product: /
Product weight: 0.183KG
Packaging size: 15*7.5*6 cm
Product packaging: Neutral Packaging
Car series: Japanese
Car type: For Toyota
1. Torque Converter Clutch (TCC) Control for Improved Transmission Efficiency (for Automatic K313 Transmissions)
For automatic versions of the K313 transmission, one of the important functions of the K313 transmission solenoid valve is to control the engagement and disengagement of the torque converter clutch, which is crucial for reducing fuel consumption and improving driving comfort:
Smooth Engagement of TCC: When the vehicle speed exceeds 60km/h (such as highway driving), the TCU sends a PWM (Pulse Width Modulation) signal to the solenoid valve. The solenoid valve gradually increases the oil pressure applied to the TCC, adjusting the pressure in 0.02bar increments. This ensures that the TCC engages smoothly without "judder" (a common problem with low-precision solenoid valves), eliminating slip between the torque converter's pump wheel and turbine wheel, and increasing transmission efficiency by 7-10%.
Intelligent Disengagement of TCC: During deceleration (such as slowing down at traffic lights) or low-speed driving (vehicle speed below 28km/h), the solenoid valve quickly reduces the TCC oil pressure to disconnect the clutch, avoiding engine stalling. In the vehicle's "Eco Mode", it can appropriately delay the engagement of the TCC to prioritize driving comfort; in scenarios requiring rapid acceleration (such as overtaking), it accelerates the engagement of the TCC to enhance power response, meeting the daily driving needs of users.
2. Shift Control for Stable Gear Changes
As a core shift execution component of the K313 transmission, the K313 transmission solenoid valve cooperates with the TCU to control the engagement and disengagement of the clutch and brake in the transmission's planetary gear set (for automatic transmissions) or the gear selection mechanism (for manual transmissions), ensuring stable gear changes:
Oil Pressure Regulation for Shifting: For automatic K313 transmissions, during upshifting (such as shifting from 2nd gear to 3rd gear) or downshifting (such as shifting from 4th gear to 2nd gear during overtaking), the solenoid valve adjusts the oil pressure of the target clutch/brake according to the TCU's calculation of engine load, vehicle speed, and other parameters. For example, during full-throttle downshifting, it can increase the brake oil pressure to 8-10bar in 0.06 seconds, ensuring that the gear change is completed within 0.35 seconds, which is faster than the industry average of 0.55 seconds for similar economical transmissions, improving the vehicle's power response. For manual K313 transmissions, it assists in regulating the hydraulic pressure during gear shifting, reducing the difficulty of gear selection and improving shifting smoothness.
Adaptive Compensation for Shifting Wear: For vehicles with a mileage of more than 150,000 kilometers, due to the wear of the transmission clutch plate (for automatic transmissions) or gear synchronizer (for manual transmissions), the shift feel may deteriorate. The K313 solenoid valve can, based on the shift time or resistance feedback from the TCU (for automatic) or transmission sensor (for manual), increase the oil pressure by 0.5-1.0bar to compensate for the wear, restoring the original shift feel and avoiding problems such as "difficult gear shifting" and "late shifting" caused by wear.
1. High Compatibility with K313 Transmission Systems
The K313 transmission solenoid valve is developed specifically for the hydraulic control system and TCU (Transmission Control Unit) logic of the K313 transmission, achieving seamless compatibility with the original K313 transmission system. Unlike universal solenoid valves, it is calibrated based on the K313 transmission's gear ratio design (with a first gear ratio of approximately 3.85-4.2 and a top gear ratio of 0.72-0.78) and the torque output characteristics of matching engines (such as 1.5L and 1.6L naturally aspirated engines commonly used in economical vehicles). During daily driving scenarios like starting and accelerating, it can respond to the TCU's pressure adjustment commands within 0.09 seconds, effectively avoiding issues such as "shift delay" and "shift jitter" that often occur with non-original solenoid valves.
Additionally, its interface dimensions (including an oil port diameter of 5.5mm and a mounting hole spacing of 24mm) are completely consistent with the K313 transmission valve body, eliminating the need for secondary modifications and ensuring a smooth fit with the original transmission system.
2. Strong Adaptability to Daily Driving Conditions
Targeting the common usage scenarios of vehicles equipped with the K313 transmission (such as urban commuting, suburban driving, and long-distance highway travel), the K313 transmission solenoid valve has optimized environmental adaptability:
Wide Temperature Adaptation Range: The electromagnetic coil of the K313 solenoid valve uses high-quality high-temperature resistant enameled wire (rated temperature class 155℃) and a lightweight aluminum alloy heat dissipation shell. It can operate stably in extreme temperatures ranging from -35℃ to 145℃. This wide temperature range ensures reliable shifting performance even in cold northern winters (where temperatures often drop below -20℃) and hot southern summers (with high temperatures exceeding 35℃). In high-temperature environments, the aluminum alloy heat dissipation shell can quickly transfer the heat generated by the coil, preventing coil burnout due to overheating.
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