Electromagnetic Load Controller Fault Diagnosis
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Solution Overview
Problem
Conventional internal combustion engine controllers face challenges in precise fault diagnosis, especially at high engine speeds, due to misdiagnosis of short circuits and noise interference, and are unreliable in regenerating counter electromotive energy.
Innovation Solution
The implementation of a current source or voltage source for controlling diagnosis potential, combined with optimized fault detection timing and noise-resistant averaging, and the use of switching elements and current sources to rapidly attenuate counter electromotive energy, ensures high-precision fault diagnosis and reliable energy regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the drive cycle of the electromagnetic load is shortened to respond to high-speed engine rotation, then the response speed improves, but the fault diagnosis precision deteriorates due to insufficient time for accurate measurement and increased susceptibility to noise
Solution Approach 1:
The diagnosis circuit performs preliminary actions by pre-charging capacitors and preparing measurement circuits before the actual fault diagnosis timing. This allows the system to have measurement-ready circuits that can quickly capture fault signals even during shortened drive cycles, resolving the contradiction between fast response and accurate measurement.
Solution Approach 2:
Capacitors are introduced as intermediary elements to store and stabilize voltage signals during the shortened drive cycle. These capacitors act as buffers that maintain signal integrity long enough for accurate fault diagnosis, enabling both fast response and precise measurement to coexist.
2Productivity
If the drive cycle is shortened for high-speed control, then the control performance improves, but the reliability of fault diagnosis deteriorates due to misdiagnosis of short circuits and noise interference
Solution Approach 1:
The diagnosis circuit uses feedback mechanisms to continuously monitor voltage levels and adjust diagnosis thresholds dynamically. This feedback allows the system to distinguish between actual faults and transient noise, maintaining high reliability even during fast-paced shortened drive cycles.
Solution Approach 2:
The system dynamically changes diagnosis parameters such as voltage thresholds and timing windows based on the current drive cycle conditions. This adaptability allows accurate fault diagnosis regardless of the shortened cycle duration, preventing misdiagnosis while maintaining high control performance.
3Device complexity
If conventional diagnosis timing is used in shortened drive cycles, then the system simplicity is maintained, but the measurement precision deteriorates due to improper timing and noise susceptibility
Solution Approach 1:
The diagnosis timing is made dynamic rather than fixed, automatically adjusting to match the shortened drive cycle duration. This dynamic timing optimization maintains system simplicity while achieving precise measurements by synchronizing diagnosis operations with the actual operational window.
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 solution enables precise fault diagnosis and improved safety by reducing misdiagnosis and heat generation, even at high engine speeds and in noisy conditions, while ensuring reliable energy regeneration.
Implementation Method 1
a switching element for rapidly attenuating counter electromotive energy generated when interrupting the electromagnetic load
Implementation Method 2
which transforms the energy into a heat energy using the Zener diode effect in a drive circuit
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
An internal combustion engine controller (2) that drives an electromagnetic load (5; 103) is provided for improving a fault diagnosis precision of the electromagnetic load (5; 103) and stabilizing a high-speed control without influence of noises (113) even if the drive cycle of the electromagnetic load (5; 103) is short. The internal combustion engine controller (2) has high reliability in a fault diagnosis for a circuit to regenerate counter electromotive energy. The internal combustion engine controller (2) comprises a current source (17, 19, 21) or a voltage source for controlling a potential of the diagnosis position in order to ensure a high-precision fault diagnosis even if the drive cycle of the electromagnetic load (5; 103), such as the fuel injector, in the internal combustion engine is shortened. Diagnosis timing is optimally set or the number of determinations for averaging is increased in order to ensure the high-precision fault diagnosis without being influenced by unexpected disturbance such as noises (113). In the fault diagnosis of the regeneration circuits into the booster circuit (3), an input/output voltage or the regeneration current of a driving switching element of the electromagnetic load (5; 103) is detected.