Driveline Disconnect Clutch Position Detection Using Actuator Current
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Solution Overview
Problem
Existing driveline disconnect assemblies often fail to reliably achieve the desired two positions of the clutch, leading to erroneous states where the disconnect device may be either connected or disconnected unexpectedly.
Innovation Solution
A method is introduced to determine the status of a clutch in a driveline disconnect device by detecting the termination of an activation signal, applying a detection current of lower magnitude, and determining the clutch position based on the current in the actuator after the detection current is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clutch actuation mechanism is used to selectively transmit torque, then the driveline disconnect device can achieve engaged and disengaged states, but the clutch may fail to positively achieve two positions on command, resulting in erroneous states
Solution Approach 1:
The system continuously monitors the actual clutch position and compares it with the desired position. When a mismatch is detected (erroneous state), the controller automatically commands the actuator to correct the position, ensuring the clutch achieves the intended engaged or disengaged state reliably
Solution Approach 2:
The patent replaces mechanical position sensing mechanisms with electronic detection methods. The controller uses electrical signals and current measurements to determine clutch position, eliminating the need for complex mechanical switches or sensors while improving detection accuracy and reliability
2Ease of operation
If the clutch actuator is commanded to change position, then the clutch should move to the desired state, but the actuator may fail to achieve the correct position, resulting in the clutch being in an unexpected state
Solution Approach 1:
The controller implements closed-loop control by continuously monitoring the clutch position and comparing it with the commanded position. If the clutch fails to reach the desired state, the controller detects the discrepancy and issues corrective commands to the actuator, ensuring reliable position achievement
Solution Approach 2:
The system automatically detects and corrects erroneous clutch states without external intervention. The controller monitors position continuously and self-corrects any position mismatches by commanding the actuator, making the system self-regulating and improving operational reliability
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 method effectively ensures that the clutch is accurately determined to be in either the engaged or disengaged position, preventing erroneous states and enhancing the reliability of the driveline disconnect assembly.
Implementation Method 1
The actuator includes a coil and a plunger that moves relative to the coil
Implementation Method 2
a spring is provided that resists movement of the second clutch member toward the first clutch member
Data Source
AI summary
A vehicle driveline disconnect device and a method of determining the status of a clutch of a driveline disconnect device includes steps to positively determine a position of the clutch. The steps may include detecting termination of an activation signal for an actuator of a clutch through which torque is selectively transmitted to one or more axles of a vehicle, determining that the clutch is in a second position and not the first position, applying a detection current to the actuator, wherein the detection current is of a lower magnitude than the current of the activation signal, and determining the position of the clutch as a function of the current in the actuator after application of the detection current.