Engine Clutch Transfer Torque Determination During Vehicle Operation
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Solution Overview
Problem
Conventional methods cannot accurately determine engine clutch transfer torque in environmentally-friendly vehicles while they are running, leading to reduced accuracy and frequency of clutch torque determination, especially under conditions like low battery charge or steep slopes.
Innovation Solution
An apparatus and method that monitor the relationship between clutch hydraulic pressure and clutch input torque from the onset of slip to when the slip releases, using a vehicle controller to control clutch engagement and release, calculate a correction factor, and determine the transfer torque based on detected torques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional method determines transfer torque only in P gear and N gear, then the determination process is simple, but the transfer torque cannot be determined while running the vehicle, resulting in insufficient determination opportunities and reduced accuracy
Solution Approach 1:
The patent applies dynamics by enabling transfer torque determination during vehicle operation rather than only in stationary P/N gear states. The system dynamically monitors clutch hydraulic pressure and clutch input torque during running conditions, allowing continuous update of transfer torque values based on actual operating parameters, thereby improving accuracy without requiring additional hardware complexity
Solution Approach 2:
The patent implements continuous determination of transfer torque during vehicle operation by continuously monitoring clutch hydraulic pressure and clutch input torque. This continuous measurement approach replaces the conventional intermittent determination method, ensuring that transfer torque data is always current and accurate for slip control operations
2Reliability
If the vehicle runs under low battery charge, high temperature, or steep slope conditions, then slip control of the engine clutch is required for proper operation, but very accurate pressure control is needed which is difficult to achieve with conventional determination methods
Solution Approach 1:
The patent implements feedback by using the determined transfer torque values to continuously adjust and optimize clutch slip control. The system monitors actual clutch performance during slip conditions and uses the accumulated transfer torque data to refine pressure control, creating a closed-loop system that improves reliability under adverse conditions through continuous learning and adjustment
Solution Approach 2:
The patent applies preliminary action by determining and storing transfer torque values during normal operating conditions before adverse conditions occur. This pre-characterization of clutch behavior allows the control system to have accurate transfer torque data readily available when slip control is needed during low battery charge, high temperature, or steep slope conditions, eliminating the need for real-time determination under stressful conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for improved accuracy and frequency of engine clutch transfer torque determination while the vehicle is running, enhancing drivability and torque management.
Implementation Method 1
a transfer torque of the engine clutch is a torque that is transferred when a friction surface of both ends of the engine clutch physically contact one another
Implementation Method 2
releases a clutch hydraulic pressure in the engine clutch
Data Source
AI summary
An engine clutch transfer torque determining apparatus of a vehicle includes: a power source including an engine and a driving motor; an engine clutch that is located between the engine and the driving motor to selectively connect the engine to the driving motor; and a vehicle controller that controls release or engagement of the engine clutch to implement a driving mode, wherein the vehicle controller releases a clutch hydraulic pressure in the engine clutch when a running state of the vehicle satisfies a transfer torque determining advancing condition, controls a speed of the motor and a speed of the engine while maintaining a speed difference between the motor and the engine in a predetermined relative speed range, and determines a transfer torque of the engine clutch based on a clutch hydraulic pressure and a clutch input torque when the engine clutch slips.