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Brand: C.OEFT
OE numbers: 7701208174
Product Name:Transmission Valve
Compatible model:/
Product status: Remanufactured
Product weight:0.06KG
Packaging size: 15X7.5X6 cm
Product packaging: Neutral Packaging
Car Series: Franch
Car Type: for Peugeot
1. Accurate Oil Circuit Switching and Gear-Shifting Control
The 7701208174 solenoid valve serves as the "command executor" for the transmission's gear-shifting process, relying on real-time signals from the Transmission Control Unit (TCU) to control the on-off of key oil circuits. When the TCU detects the need for gear shifting (such as when the vehicle accelerates or decelerates), it sends a pulsed electrical signal to the solenoid valve's coil. The coil then generates a magnetic field that overcomes the resistance of the return spring, driving the spool to move axially. This movement either connects or disconnects the oil passages leading to specific clutches and brakes, enabling the engagement of the target gear and the disengagement of the current gear.
For example, in a European-brand sedan equipped with a 6-speed automatic transmission (to which the 7701208174 solenoid valve is adapted), when the driver shifts from "Neutral (N)" to "Drive (D)", the TCU sends a dedicated signal to this solenoid valve. The valve quickly opens the oil circuit leading to the 1st gear clutch, allowing hydraulic oil to enter the clutch chamber and compress the friction plates, thereby smoothly engaging the 1st gear. When de-energized, the return spring promptly resets the spool, closing the corresponding oil circuit to prevent abnormal oil pressure buildup, ensuring the transmission's standby state is stable and reliable.
2. Dynamic Hydraulic Pressure Regulation for Smooth Operation
A key functional advantage of the 7701208174 solenoid valve lies in its linear pressure regulation capability, which directly addresses the issue of gear-shifting 顿挫 (jerking) and improves driving comfort. During the gear-shifting process, the TCU does not simply switch the solenoid valve on or off; instead, it adjusts the duty cycle of the electrical signal (ranging from 0% to 100%) to control the magnetic force of the coil. This, in turn, changes the opening degree of the spool (from fully closed to fully open), thereby precisely regulating the flow rate and pressure of hydraulic oil in the oil circuit.
When the transmission shifts at low speeds (e.g., from 1st gear to 2nd gear), the TCU initially reduces the duty cycle of the signal sent to the 7701208174 solenoid valve, keeping the spool in a partially open state. This limits the hydraulic oil pressure to a low level, allowing the 2nd gear clutch to engage gradually rather than abruptly. As the gear-shifting process progresses, the TCU gradually increases the duty cycle, increasing the spool opening and oil pressure until the clutch is fully engaged. This "soft engagement" mechanism controls the pressure fluctuation within ±0.15 bar, significantly reducing the impact between mechanical components during gear shifting and eliminating the sense of 顿挫. Additionally, during the vehicle's constant-speed cruising, the solenoid valve maintains a stable medium pressure output, ensuring the clutch remains engaged tightly without slipping, while avoiding excessive oil pressure that would increase energy consumption.
1. Wide Adaptability to European and Domestic Joint-Venture Models
The 7701208174 solenoid valve is primarily designed for automatic transmissions used in European-brand vehicles and domestic Sino-foreign joint-venture models, covering a broad range of vehicle types and transmission configurations:
European-Brand Adaptation: It is a core component for the 6-speed and 8-speed automatic transmissions of mainstream European brands such as Peugeot, Citroën, and Renault. For example, it is fully compatible with the EAT6 automatic transmission (used in Peugeot 508, Citroën C6) and the Renault JH3 automatic transmission (used in Renault Kadjar). Its structural dimensions and electrical parameters (e.g., coil resistance of 12±0.5 Ω) are perfectly matched to the original transmission systems, eliminating the need for modification during replacement.
Domestic Joint-Venture Adaptation: It is also widely used in domestic joint-venture models equipped with imported or localized European transmissions, such as the Dongfeng Peugeot 408, Dongfeng Citroën C5, and Dongfeng Renault Koleos. These models often adopt the same transmission platforms as their European counterparts, and the 7701208174 solenoid valve meets the strict quality standards of joint-venture manufacturers, ensuring consistent performance with the original parts.
Transmission Version Compatibility: It can adapt to different torque versions of the same series of transmissions (e.g., the EAT6 transmission has low-torque versions for 1.6T engines and high-torque versions for 2.0T engines) through minor adjustments to the spool's flow coefficient. This avoids the need for developing multiple solenoid valve models, reducing the inventory pressure for repair shops and manufacturers.
2. High Response Speed and Energy-Saving Performance
Millisecond-Level Action Response: The 7701208174 solenoid valve adopts a high-conductivity copper coil and a lightweight spool (made of aluminum alloy), significantly reducing the inertia of the moving parts. When the TCU sends a control signal, the coil can generate a sufficient magnetic field within 8-15 milliseconds, and the spool can complete the full-stroke movement (typically 3-5 mm) in 20-30 milliseconds. This ultra-fast response speed ensures that the transmission's gear-shifting process is completed within 0.25 seconds, avoiding delays in power delivery during rapid acceleration and improving the vehicle's dynamic performance.
Low-Power Consumption Design: The solenoid valve's coil uses a high-efficiency silicon steel sheet core, which reduces magnetic hysteresis loss and eddy current loss by 20% compared to ordinary iron cores. In the fully energized state, its power consumption is only 8-10 W, which is 30% lower than that of traditional solenoid valves. During stable operation (e.g., maintaining a fixed gear), the TCU automatically reduces the duty cycle of the signal to 30%-50%, further reducing the power consumption to 3-5 W. For a vehicle that travels 15,000 kilometers per year, this energy-saving design can reduce the transmission control system's electricity consumption by approximately 6-9 kWh annually, contributing to the vehicle's overall fuel efficiency.
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