Ignition Overcurrent Switching for Reliable Emergency Starting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automotive starting systems face issues with abnormal operations and potential damage due to short circuits or improper connections during emergency starting, leading to failed ignition and potential harm to the starting power system.
Innovation Solution
An ignition overcurrent protection device with a switch, current detection circuit, and controller that determines current ranges and corresponding time thresholds to trigger overcurrent protection, ensuring normal ignition and preventing damage by controlling the switch based on current duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emergency starting power is used to restart the automobile, then the automobile can be restarted after flameout, but short circuits or improper connections may occur causing failed ignition or damage to the starting power system
Solution Approach 1:
The patent applies preliminary action by detecting current values before abnormal operations cause damage, and by setting predetermined time thresholds in advance for different current ranges. The controller continuously monitors current during the starting process and is prepared to cut off power supply when abnormal conditions are detected, preventing short circuits and improper connections from causing failed ignition or damage to the starting power system.
Solution Approach 2:
The patent implements feedback by continuously detecting the current value flowing from the starting power through the power-on connector and comparing it against predetermined time thresholds. The controller receives real-time current feedback, determines the current range, and adjusts the power supply state accordingly - maintaining power supply for normal current ranges while cutting off supply when current exceeds safe thresholds, thus ensuring reliable starting while protecting against overcurrent damage.
2Device complexity
If overcurrent protection is implemented with fixed time threshold, then protection is simple to implement, but it cannot adapt to different current levels during ignition start process
Solution Approach 1:
The patent applies segmentation by dividing the current detection range into multiple current ranges, each with its own predetermined time threshold. Instead of using a single fixed threshold, the system segments the protection mechanism to handle different current levels appropriately, allowing the controller to select the suitable time threshold based on the detected current range during the ignition start process.
Solution Approach 2:
The patent implements dynamics by making the time threshold adaptive rather than fixed. The controller dynamically adjusts the time threshold based on the detected current value - when current falls within a specific range, the corresponding predetermined time threshold is applied. This dynamic adaptation allows the protection mechanism to respond appropriately to varying current conditions during different stages of the ignition start process.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
This present disclosure discloses an ignition overcurrent protection device, which includes an overcurrent protection switch, a current detection circuit, and a controller. The overcurrent protection switch is electrically coupled between a starting power and a power-on connector; the power-on connector is configured for connecting to the automotive power. The current detection circuit is configured for detecting a current value flowing between the starting power and the power-on connector. The controller is coupled to the overcurrent protection switch and the current detection circuit. The controller is configured to determine a current range where the current value is located, and determine a preset time threshold corresponding to the current range, and control the overcurrent protection switch to be turned off when a duration of the current value reaches the preset time threshold. The present disclosure also provides a starting power equipment and ignition overcurrent protection. This present disclosure can set different trigger times of overcurrent protection according to difference in current during an ignition and start process. Therefore, it can be ensured that the automobile can be fired and started when there is no abnormality, and the overcurrent protection is effectively performed when there is an abnormality.