SEARCH FOR YOUR PRODUCT
Brand: C.OEFT
OE numbers:0260130108
EAProduct Name: Transmission Valve
Compatible model: 7DCT250
Product status: Remanufactured
Product weight: 0.558 KG
Packaging size: 15*7.5*6 cm
Product packaging:Neutral Package
Car Series: Chinese
Car Type: for Roewe Great Wall Changan
Transmission solenoid valves, as core control components of automatic transmissions, have their product functions divided into the following technical modules:
1. Precise Regulation of Hydraulic Systems
①Oil Circuit Switching and Flow Control
·Drive spool displacement through electromagnetic force to realize on-off switching of hydraulic oil circuits and stepless flow adjustment, thereby completing the engagement and disengagement of clutches/brakes.
·Proportional solenoid valves can precisely control oil pressure (with an error of ±0.1bar) to optimize shift smoothness.
②Main Oil Pressure and Torque Converter Lock-up Control
· Independent pressure-regulating solenoid valves separately control the main oil circuit pressure (which affects shift timing) and the lock-up oil pressure of the hydraulic torque converter (to improve transmission efficiency).
2. Shift Logic Execution
①Multi-gear Coordination
· Different solenoid valves control specific combinations of clutches or brakes to achieve switching between gears (e.g., 1st to 2nd gear is coordinated by solenoid valves A + B).
·Dynamically adjust the opening during shifting to reduce impact by 40%.
②Power Transmission Management
· Cut off or transmit engine power according to TCU instructions to realize switching between working conditions such as idling and acceleration.
·Achieve reverse gear function through reverse oil circuit control.
3. System Protection and Extended Functions
①Fault Protection
·Trigger the TCU degradation mode when oil pressure is abnormal to limit gears and protect the transmission.
·Redundant design can switch to a backup oil circuit to avoid sudden failure.
② Energy Efficiency Optimization
·Optimize the lock-up timing of the hydraulic torque converter to reduce fuel consumption by 3-5%.
·Real-time monitor solenoid valve response through OBD to warn of jamming risks.
As a core control component of automatic transmissions, the product advantages of transmission solenoid valves are mainly reflected in the following technical dimensions:
1、 Precise Control and Response Performance
①Millisecond-level Dynamic Adjustment
·The spool displacement is driven by electromagnetic force to achieve stepless adjustment of hydraulic oil circuit flow and pressure, with a shift response speed of 10-50ms, significantly improving shift smoothness.
·Proportional solenoid valves can precisely control the clutch engagement pressure, reducing shift shock by more than 40% (e.g., General Motors 6AT transmission).
②Multi-working-condition Adaptability
·It works in coordination with the TCU (Transmission Control Unit) to adjust oil pressure in real time according to vehicle speed and load, optimizing transmission efficiency and fuel economy.
2. Integrated and Reliable Design
①Modular Structure
·It integrates the pilot control valve and direct drive valve, simplifying the complexity of the hydraulic system and reducing the failure rate by 30%.
·Some models (e.g., ZF 8HP) adopt an integrated design of solenoid valve and valve body to reduce the risk of leakage.
②Resistance to Extreme Environments
· The valve body is made of hard anodized aluminum alloy, which can withstand high temperatures of 120℃ and corrosion from transmission oil, with a service life of over 150,000 kilometers.
·The redundant oil circuit design can automatically switch to a backup channel when the main oil circuit is blocked.
3. Energy Efficiency and Function Expansion
①Energy Saving and Consumption Reduction
·The optimized lock-up control of the hydraulic torque converter increases transmission efficiency by 5-8% and reduces fuel consumption by 3-5% under NEDC conditions.
②Intelligent Diagnosis
·Equipped with a built-in OBD (On-Board Diagnostics) monitoring function, it can warn of solenoid valve jamming or abnormal oil pressure, reducing the risk of sudden failures.
INQUIRE NOW 
