Switch Detection Device Low Power Mode Energy Conservation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle switch detection systems face challenges in conserving energy when the vehicle is not in operation, as they continue to draw current from the battery, leading to battery depletion, and existing solutions do not effectively manage current drain during low power modes.
Innovation Solution
A switch detection device with configurable parameters such as threshold voltages, output currents, and polling time intervals allows for reduced quiescent and load current consumption, enabling it to enter a low power mode by selectively activating detection circuits and using multiple polling intervals to minimize energy usage, while maintaining noise immunity and accommodating various switch types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch detection device continuously monitors switch states in normal mode, then the reliability of switch state detection is improved, but the current drain on the battery increases
Solution Approach 1:
The switch detection device dynamically transitions between normal mode and low power mode based on vehicle operation status. In normal mode, the device continuously monitors all switches for reliable detection. In low power mode, the device reduces monitoring frequency and disables non-essential functions to minimize current drain, thereby resolving the contradiction between detection reliability and energy consumption.
Solution Approach 2:
The device implements periodic sampling of switch states with configurable polling intervals. Instead of continuous monitoring, the device samples switches at predetermined time intervals, significantly reducing current drain while maintaining adequate detection capability. The polling rate can be adjusted based on priority levels of different switches.
2Use of energy by moving object
If the switch detection device enters low power mode with reduced polling frequency, then the current drain on the battery is reduced, but the response time to detect switch state changes increases
Solution Approach 1:
The device assigns different priority levels to different switches and applies different polling strategies accordingly. High-priority switches (e.g., safety-critical switches) are polled more frequently even in low power mode, while low-priority switches are polled less frequently. This localized differentiation resolves the contradiction by ensuring critical detections remain timely while overall energy consumption is reduced.
Solution Approach 2:
The device configurable parameters such as polling intervals, threshold voltages, and output currents are adjusted based on operating conditions. In low power mode, the device uses longer polling intervals for non-critical switches to reduce current drain, while maintaining shorter intervals for high-priority switches. This parameter adjustment resolves the contradiction between energy savings and detection response time.
3Use of energy by moving object
If the switch detection device uses multiple polling time intervals for different priority switches, then the current drain on the battery is reduced, but the device complexity increases
Solution Approach 1:
The device segments switches into different priority groups (e.g., high priority, normal priority, low priority) and assigns different polling intervals to each group. This segmentation allows the device to manage complexity by organizing switches into discrete categories with predefined polling strategies, making the system manageable despite multiple polling intervals.
Solution Approach 2:
The device implements a universal polling management mechanism that handles multiple priority levels through a single configurable framework. The microcontroller unit manages all polling operations using a unified approach with configurable parameters, reducing the need for separate dedicated circuits for each priority level and thereby limiting the increase in device complexity.
Data Source
AI summary
A method of switch detection is disclosed that comprises, enabling a low power mode on a switch detection device, activating a first detection circuit for detecting, at a first expiration of a first polling time interval, a first switch state of a first switch having a first priority level, the first switch state including one of a first open state and a first closed state, comparing the detected first switch state with a prior first switch state, and activating a second detection circuit for detecting, at a second expiration of a second polling time interval, a second switch state of a second switch having a second priority level, the second switch including one of a second open state and a second closed state, and the second polling time interval being greater than the first polling time interval, and the second priority level being different from the first priority level.