JF010

1. Central Control of CVT Hydraulic System

As the "hydraulic command center" of the CVT, the JF010 valve body precisely controls the flow direction, pressure, and flow rate of hydraulic oil through built-in components such as pressure valves, flow valves, and solenoid valves. When the TCU issues a speed ratio adjustment command, the valve body quickly switches the oil circuit (oil circuit response time ≤40ms), driving the torque converter lock-up clutch and steel belt/chain clamping mechanism to act, realizing continuous speed ratio adjustment. It is a core component ensuring "gap-free" power transmission of the CVT, guaranteeing smooth power transmission from the engine to the wheels and avoiding power interruption caused by speed ratio adjustment deviations.

2. CVT-Specific Intelligent Speed Ratio Adjustment

It receives real-time data commands from the TCU (data transmission rate of 800kbps) and dynamically optimizes the speed ratio adjustment strategy based on the transmission characteristics of the CVT: In "Economy Mode", it targets the lowest engine speed, adjusts the speed ratio in advance (e.g., when the vehicle speed is 60km/h, the speed ratio is stabilized at 0.8-1.0), prioritizing fuel efficiency; In "Sport Mode", it maintains a higher engine speed (2000-3500rpm) and achieves "explosive" acceleration by delaying speed ratio increase; It supports "Manual Mode" 

(simulating 6-8 fixed gears), accurately responding to the driver's shifting operations (response delay ≤80ms). At the same time, it has a speed ratio protection function (e.g., prohibiting speed ratio reduction when the speed exceeds 6000rpm) to avoid overload damage to the CVT drive mechanism.

3. Dynamic Management of System Pressure and Flow

Through a built-in pressure feedback mechanism (sampling frequency of 80Hz), it real-time monitors and maintains the stable pressure of the CVT hydraulic system (normal working pressure range of 5-30MPa): When the oil pressure is too high (exceeding 32MPa), it automatically opens the pressure relief valve to release pressure, avoiding excessive wear of the steel belt/chain due to excessive clamping force; When the oil pressure is too low (below 4MPa), it activates the booster pump to increase the oil pressure, preventing speed ratio adjustment failure and transmission slipping; Meanwhile, it precisely controls the hydraulic oil supply through the flow control valve (flow adjustment range of 4-18L/min), ensuring the timeliness and accuracy of spool movements, reducing speed ratio adjustment delay, and improving the overall transmission efficiency of the CVT (measured transmission efficiency can reach 90%-92%), thereby reducing power loss.

4. Protection of CVT Core Components and Fault Diagnosis

It has multiple CVT-specific protection functions: When detecting that the temperature of the steel belt/chain exceeds 110℃, it automatically reduces the clamping force oil pressure (by 3-5MPa) to reduce frictional heat generation, and at the same time triggers the TCU to issue an "overheating warning"; When there is slight blockage in the oil circuit (flow rate drop exceeding 15%), it opens the bypass oil circuit (bypass flow of 6-10L/min) to maintain basic speed ratio adjustment functions, avoiding sudden shutdown of the CVT; When the vibration amplitude of the valve body exceeds 0.4g, it triggers a buffer mechanism (damping coefficient adjusted to 0.7) to protect internal precision components. In addition, it can real-time monitor its own working status, convert problems such as abnormal oil pressure, spool jamming, and sensor failures into 16-bit fault codes (complying with the ISO 15031 protocol) and transmit them to the TCU. Maintenance personnel can quickly locate fault points through diagnostic equipment, improving maintenance efficiency by 35%.