Engine Clutch Torque Detection via Motor Current Deviation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing environmentally friendly vehicles face challenges in precisely controlling engine clutch delivery torque, leading to decreased drivability and fuel efficiency due to characteristic deviations in solenoid valve operation and friction member degradation, which are not effectively addressed by current detection technologies.
Innovation Solution
A system and method for detecting engine clutch delivery torque in environmentally friendly vehicles, involving a hybrid controller that maintains a predetermined relative speed between the motor and engine, engages the clutch with control pressure above a contact point, measures torque, and calculates torque deviation to detect and compensate for delivery torque, improving control precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If engine clutch control is performed based on estimated delivery torque from friction coefficient and pressure, then the control system can operate without additional sensors, but the measurement precision deteriorates due to characteristic deviations from solenoid valve aging and friction member degradation
Solution Approach 1:
The patent introduces an intermediary detection system that measures the actual delivery torque of the engine clutch through a sensor that detects the torque transmitted from the engine to the motor. This intermediary measurement bridge connects the control system to the actual torque state, allowing correction of the estimated torque values and compensating for characteristic deviations without fundamentally changing the entire control architecture.
Solution Approach 2:
The patent implements a feedback mechanism where the detected delivery torque is fed back to the controller, which then corrects the estimated torque values and adjusts the clutch control pressure accordingly. This closed-loop feedback system continuously compensates for deviations caused by solenoid valve aging and friction member degradation, maintaining measurement precision over time.
2Reliability
If engine clutch control pressure is increased to compensate for friction member degradation, then the reliability of torque transmission is improved, but the device complexity increases due to additional correction mechanisms
Solution Approach 1:
The patent changes the control parameter from fixed pressure control to dynamic pressure control based on detected delivery torque. The controller adjusts the clutch control pressure in real-time according to the actual torque transmission state, compensating for friction member degradation through parameter adjustment rather than adding complex mechanical correction mechanisms.
3Ease of operation
If delivery torque detection is implemented to compensate for characteristic deviations, then the drivability and fuel consumption are improved, but the measurement precision requirement increases, demanding more sophisticated detection systems
Solution Approach 1:
The patent replaces complex mechanical measurement mechanisms with an electrical detection system that measures delivery torque through current and voltage signals from the motor. This substitution maintains high measurement precision while simplifying the overall detection system architecture, as electrical measurements can achieve high precision without complex mechanical components.
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 enhances drivability and fuel efficiency by accurately detecting and compensating for torque deviations, ensuring precise engine clutch control and improved responsiveness during starting conditions.
Implementation Method 1
an inverter controlled by a hybrid controller to operate the motor
Implementation Method 2
The delivery torque of the engine clutch, which is torque (e.g., load at both ends of the engine clutch) transmitted by physical contact between the friction surfaces of both ends of the engine clutch
Data Source
AI summary
Disclosed is a detecting method of engine clutch delivery torque of a vehicle including: determining, by a controller, when the position of a shift lever satisfies a detecting condition of engine clutch delivery torque; converging, by the controller, to a predetermined target speed by operating a motor without load; measuring, by the controller, motor torque without a load at the target speed and engaging the engine clutch with a control pressure above a contact point (contact point+α) according to a control logic; detecting, by the controller, motor torque including the delivery torque of the engine clutch, when the speed and the torque of the motor converge according to engagement of the engine clutch; calculating, by the controller, torque deviation by comparing the motor torque without load and the motor torque including the engine clutch delivery torque; and detecting, by the controller, a compensation factor by comparing a model value of the engine clutch delivery torque with the torque deviation.