Phase Angle Detector Diagnosis in Motor Vehicle Drive Devices
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Solution Overview
Problem
Existing methods for diagnosing phase angle detectors in motor vehicle drive devices are complex and costly, and cannot effectively distinguish between detector defects and situations where the vehicle is stationary or unable to generate torque.
Innovation Solution
A method that initiates a diagnostic operating mode by interrupting the connection between the electric machine and output shaft, adjusting the electric machine to a defined rotational speed, and using rotational speed sensors to determine the phase angle detector's functionality, allowing for efficient and cost-effective diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the phase angle detector is continuously monitored during normal operation, then detector functionality can be assessed, but it is impossible to distinguish between detector defects and situations where the vehicle is stationary or torque is insufficient
Solution Approach 1:
The patent applies preliminary action by performing a diagnostic test before normal operation continues. The control device initiates a diagnostic operating mode that temporarily interrupts the operative connection between the electric machine and output shaft, then activates the electric machine at a defined rotational speed specifically for testing the phase angle detector. This preliminary diagnostic action allows accurate detection of detector functionality independent of vehicle operating conditions.
2Reliability
If additional sensors or complex retooling is implemented to improve diagnosis accuracy, then detector defects can be reliably distinguished from operational conditions, but the cost and complexity of the system increases
Solution Approach 1:
The patent applies self-service by using the existing electric machine and control device to perform the diagnostic function. The control device utilizes the electric machine's ability to generate rotational movement and controls the interruptible operative connection to create test conditions. No additional sensors or external diagnostic equipment are required - the system uses its own components to diagnose the phase angle detector, thereby maintaining simplicity while achieving reliable diagnosis.
3Measurement precision
If the electric machine is continuously operated at defined rotational speed for testing, then phase angle detector functionality can be accurately assessed, but normal vehicle operation and productivity are reduced
Solution Approach 1:
The patent applies periodic action by implementing the diagnostic test as an intermittent operation rather than continuous operation. The control device periodically initiates the diagnostic operating mode at defined rotational speed to assess the phase angle detector, then returns to normal vehicle operation. This periodic testing approach ensures accurate detector assessment while minimizing impact on vehicle productivity and normal operation.
Data Source
AI summary
A method for operating a drive device of a motor vehicle which has at least one electric machine with a phase angle detector and an output shaft operatively connectable with the electric machine, includes: when a return value of the phase angle detector of the electric machine is constant, performing a first diagnostic operating mode of the drive device, in which the operative connection between the electric machine and the output shaft is interrupted, subsequent, the electric machine is controlled by open lop control to a defined rotational speed, and when the return value continues to be constant after controlling the electric machine to the defined rotational speed, a first operating state of the phase angle detector is recognized and otherwise a correct function of the phase angle detector is recognized.