Push-Button Switch Circuit for Fault Detection in Motor Control
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Solution Overview
Problem
Current push-button switch assemblies in vehicles lack the ability to accurately diagnose faults, leading to potential unintentional motor starts or impeded stops, which can increase emissions and inconvenience drivers.
Innovation Solution
A push-button switch assembly with a circuit design comprising resistors and switches in series and parallel configurations, along with a controller that determines operational conditions by measuring voltages across these circuits, allowing for fault detection and prevention of unintended engine operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional push-button switch assembly is used, then the device complexity is low, but the measurement precision of fault detection is insufficient
Solution Approach 1:
The switch assembly is segmented into multiple independent circuits (first circuit with first switch, second circuit with second switch) each with distinct resistor configurations. This segmentation allows independent monitoring of different switch states and fault conditions, improving measurement precision without creating a single complex monolithic circuit.
Solution Approach 2:
Different resistor values are assigned to different positions in the circuit (first resistor in series with first switch, second resistor in parallel, third resistor in series with second switch, fourth resistor in parallel). This local differentiation creates unique electrical characteristics for each switch circuit, enabling precise local fault detection while maintaining overall circuit simplicity.
2Reliability
If fault detection capability is added to the push-button switch assembly, then the reliability of motor control improves, but the device complexity increases
Solution Approach 1:
The circuit is designed with predetermined resistor configurations and multiple measurement points before operation begins. The controller is pre-programmed with expected voltage ranges for normal operation, allowing it to detect faults by comparing actual measurements against these pre-established parameters, thereby improving reliability without adding complex real-time decision logic.
Solution Approach 2:
The controller continuously measures voltages across the resistor circuits and compares them against expected ranges. When voltage measurements fall outside predetermined ranges, the controller identifies specific fault conditions (switch failure, resistor failure, short circuit). This feedback mechanism provides reliable fault detection while maintaining relatively simple circuit architecture by using software-based monitoring rather than additional hardware sensors.
3Adaptability or versatility
If multiple circuits with different resistor configurations are used, then the diagnostic capability improves, but the manufacturing precision requirements increase
Solution Approach 1:
The system uses predetermined voltage ranges that account for normal variations in resistor values during manufacturing. By establishing acceptable voltage measurement ranges for each switch state, the system can tolerate reasonable manufacturing tolerances in resistor values while still providing accurate fault diagnosis. This approach enables versatile diagnostic capability without requiring extremely tight manufacturing precision.
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
The solution enables accurate fault detection and prevention of unintended engine starts or stops, reducing emissions and improving driver convenience by ensuring reliable motor control.
Implementation Method 1
control circuitry configured to determine a voltage across a first circuit comprising a first resistor arranged in series with a first switch, and a second resistor arranged in parallel with the first resistor and the first switch. The control circuitry is configured to determine a voltage across a second circuit comprising a third resistor arranged in series with a second switch, and a fourth resistor arranged in parallel with the third resistor and the second switch.
Data Source
AI summary
Systems and methods are described for a push-button switch assembly with the ability to diagnose faults. The push-button switch assembly comprises a first circuit comprising a first resistor arranged in series with a first switch, and a second resistor arranged in parallel with the first resistor and the first switch, and a second circuit comprising a third resistor arranged in series with a second switch, and a fourth resistor arranged in parallel with the third resistor and the second switch, wherein the first switch and the second switch are each closable by displacement of a push-button of the push-button switch assembly.