Powertrain No-Start Diagnostics via Starter Resistance Analysis
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Solution Overview
Problem
Conventional diagnostic approaches for powertrain no-start faults fail to accurately distinguish between various fault modes, such as faulty starter control relay, battery, solenoid, motor, or fuel delivery system, complicating maintenance and repair efforts.
Innovation Solution
A method and system that utilize a starting sequence to record starter data, derive resistance ratios or resistances using a controller, and execute control actions based on identified fault modes, allowing for precise fault isolation and diagnosis in a powertrain with a controller-enabled starter system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional diagnostic approaches are used, then the diagnostic system is simple, but the fault mode identification is inaccurate
Solution Approach 1:
The diagnostic method segments the fault identification process into distinct phases: initial assessment phase (checking basic system states), detailed diagnostic phase (measuring specific electrical parameters), and fault isolation phase (determining exact fault location). This segmentation allows accurate fault mode identification without requiring all diagnostic components to be active simultaneously, thus managing system complexity.
Solution Approach 2:
The system performs preliminary diagnostic actions by checking basic system states and parameters before initiating more complex diagnostic procedures. This preliminary assessment prepares the diagnostic system by identifying obvious faults early and configuring the diagnostic approach based on initial findings, improving overall diagnostic accuracy while avoiding unnecessary complex measurements.
2Reliability
If multiple fault candidates are considered, then the diagnostic coverage is comprehensive, but the maintenance and repair process becomes complicated
Solution Approach 1:
Instead of starting with all possible fault candidates and eliminating them one by one, the system inverts the approach by first measuring specific electrical parameters (voltage drops, resistance values) that directly indicate fault modes, then confirming the exact fault location. This inversion reduces the number of fault candidates that need to be considered by focusing measurements on discriminating parameters.
Solution Approach 2:
The system replaces manual fault isolation procedures with automated electrical parameter measurements and analysis. By using the controller to automatically measure voltage drops across starter components and analyze resistance values, the system eliminates the need for manual testing and complex maintenance procedures, achieving comprehensive diagnostic coverage while simplifying the repair process.
3Productivity
If starter control relay is enabled, then the engine should start, but no-start conditions still occur due to other faults
Solution Approach 1:
The system introduces electrical parameter measurements (voltage drops, resistance values) as intermediary indicators that mediate between the starter control relay enablement and the actual engine starting. By measuring these intermediary parameters during the starting attempt, the system can detect faults in battery, solenoid, motor, or wiring without requiring the engine to successfully start, thus improving fault detection capability while maintaining engine start reliability.
4Measurement precision
If detailed starter data is recorded, then the fault diagnosis is accurate, but the data processing complexity increases
Solution Approach 1:
The system extracts only the critical electrical parameters (voltage drops across specific components, resistance values, current measurements) needed for fault diagnosis from the overall starter system operation. By focusing on these specific extracted parameters rather than recording all possible starter data, the system achieves accurate fault diagnosis while minimizing data processing complexity through selective measurement.
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 accurate isolation of no-start fault modes and execution of corresponding control actions, facilitating efficient maintenance and repair by distinguishing between different fault modes within the starter system.
Implementation Method 1
The received request closes a solenoid control relay, which in turn causes an electrical current to be delivered to a starter solenoid
Implementation Method 2
The starter system includes a battery
Implementation Method 3
The starter motor stops and the pinion gear disengages from the flywheel. The internal combustion process is thereafter sustained via operation of the fuel delivery system
Data Source
AI summary
A method diagnoses a no-start condition in a powertrain having an engine and a starter system operable for starting the engine. The starter system includes a battery, solenoid relay, starter solenoid, and starter motor. The method includes recording starter data over a calibrated sampling duration in response to a requested start event when the solenoid relay is enabled, including a cranking voltage and engine speed. If no battery current sensor is used, the method derives a resistance ratio using an open-circuit voltage and a minimum cranking voltage of the battery. When such a sensor is used, the method derives a battery and starter resistance. A fault mode of the starter system is then identified via a controller using the starter data and either the resistance ratio or the battery and starter resistances. A control action executes that corresponds to the identified fault mode.