Diagnostic Device for Control Signal Line Defect Detection
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Solution Overview
Problem
Current diagnostic systems for motor vehicles cannot effectively determine whether a defect in the control signal line between the controller and the charging terminal is due to the vehicle or the charging infrastructure, making it difficult to diagnose and address issues outside of the charging process.
Innovation Solution
A diagnostic device is implemented with a first resistor connecting the control signal line to ground and a second resistor in parallel on the charging connection side, using a current or voltage source to measure defects, and a diode to prevent interference, allowing for diagnostic testing outside of charging operations and compliance with standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single resistor is used in the controller to connect the control signal line to ground, then the charging communication function is maintained, but the ability to diagnose control signal line defects is insufficient
Solution Approach 1:
The single resistor in the controller is divided into two resistors: a first resistor remaining in the controller and a second resistor placed in the charging connection. This segmentation enables independent measurement of control signal line defects while maintaining the original charging communication function, resolving the contradiction between enhanced diagnostic capability and device complexity.
2Reliability
If diagnostic testing is performed during charging operations, then real-time defect detection is possible, but interference with charging current and signal evaluation may occur
Solution Approach 1:
The patent enables diagnostic testing to be performed before charging operations begin (during vehicle operation with open load). The evaluation device measures current or voltage indicating defects using the resistor network prior to charging, eliminating interference from charging current while maintaining reliable defect detection capability.
Solution Approach 2:
The diode connected in series with the resistors acts as an intermediary that blocks current flow from ground to the control signal line during charging operations. This prevents interference with signal evaluation while allowing diagnostic measurements to be performed, resolving the contradiction between diagnostic accuracy and charging interference.
3Object-affected harmful factors
If the control signal line defect diagnosis is performed outside charging operations, then interference with charging is avoided, but real-time defect detection capability is reduced
Solution Approach 1:
The vehicle's controller performs self-diagnosis of the control signal line during normal operation outside charging operations. The evaluation device uses the existing resistor network to autonomously detect defects without requiring external diagnostic equipment or interrupting charging operations, enabling continuous monitoring while avoiding charging interference.
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
Enables regular, out-of-charge diagnostic testing to identify control signal line defects within the vehicle, enhancing diagnostic capabilities and ensuring compliance with standards by using a combination of resistors and a voltage or current divider circuit.
Implementation Method 1
a first resistor in the control device connects the control signal line to ground and a second resistor connected in parallel with the first resistor is provided on the charging-connection-side
Implementation Method 2
an evaluation device of the control device has a current source and/or a voltage source for supplying a current and/or a voltage outside a charging operation and is configured to measure a current indicating a control signal line defect or a voltage indicating a control signal line defect
Implementation Method 3
wherein a diode blocking a current flow from ground to the control signal line is connected in series with the first and the second resistor
Data Source
AI summary
A diagnostic device for checking a control signal line between a control device of a motor vehicle and a motor-vehicle-side charging connection for a battery of the motor vehicle, includes a first resistor disposed at the charging connection and connecting the control signal line to ground, a second resistor connected in parallel with first resistor to form a parallel circuit, an evaluation device associated with the control device and comprising a current source and/or a voltage source for supplying a corresponding current or voltage outside a charging operation, and a diode connected in series with the first and second resistors and blocking a current flow from ground to the control signal line. The evaluation device is configured to measure, by using the first and second resistor, a current indicating a control signal line defect or a voltage indicating a control signal line defect.