Vehicle Delayed Accessory Power Mode for Battery Preservation
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Solution Overview
Problem
Vehicles with idle shutdown strategies face battery drainage issues when the ignition switch is left in the ON or RUN position, leading to reduced battery life and increased warranty costs due to repeated deep-cycling, especially in CARB-regulated states where engine shutdown is required.
Innovation Solution
A method is implemented to detect post-idle shutdown conditions and transition the vehicle into a delayed accessory power mode, using network message information to manage the ignition, brake, and engine states, ensuring battery preservation by supplying power to accessories only when necessary, thus preventing unnecessary battery drain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ignition switch is left in the ON or RUN position after engine shutdown, then the electrical system can supply power to accessories, but the battery drains rapidly leading to reduced battery life
Solution Approach 1:
The patent introduces an intermediary control system that mediates between the ignition switch and the electrical load. This system monitors engine shutdown conditions and automatically controls power delivery to accessories, acting as a mediator that prevents direct battery drainage while maintaining accessory functionality when needed.
Solution Approach 2:
The system implements feedback by continuously monitoring engine status, ignition position, and brake pedal state. Based on this feedback, the control system dynamically adjusts power supply to accessories, enabling the battery to be preserved while maintaining operational convenience through automated decision-making.
2Object-generated harmful factors
If the engine is shutdown to meet emissions standards, then green house emissions are reduced, but the battery drains in as little as 2 hours making the vehicle unable to start
Solution Approach 1:
The system uses feedback from engine status, ignition position, and brake pedal state to dynamically control power supply. This feedback mechanism ensures the battery is preserved during idle shutdown while maintaining sufficient charge for vehicle starting, thus preserving reliability without compromising emissions reduction.
Solution Approach 2:
The control system provides self-service by automatically managing power distribution based on detected conditions. It monitors the state of the vehicle and autonomously decides when to supply power to accessories and when to conserve battery charge, eliminating the need for manual driver intervention.
3Duration of action of stationary object
If the delayed accessory power mode is activated to preserve battery, then battery life is extended, but the system complexity increases
Solution Approach 1:
The control system achieves multi-functionality by using a single integrated controller that handles multiple detection functions (engine status, ignition position, brake pedal state) and control functions (power supply management, battery preservation). This universal approach reduces overall system complexity compared to having separate dedicated systems for each function.
Solution Approach 2:
The patent merges the detection and control functions into a unified system. The control system combines monitoring of engine status, ignition position, and brake pedal state with the power supply control logic, creating an integrated solution that manages battery preservation and accessory power supply through a single coordinated mechanism.
Data Source
AI summary
A method for preserving battery operation and life during vehicle post idle shutdown, such vehicle having a delayed accessory power mode operative when an ignition state of the vehicle is in a non-engine running condition while an ignition switch of the vehicle is in the ON position to supply accessories in the vehicle the battery. The method includes: detecting whether the vehicle has been in an post idle shutdown condition and brake pedal not pressed and ignition state unchanged; and placing the vehicle in the delayed accessory power mode after detecting that the vehicle has been in an post idle shutdown condition and while the ignition switch is in the ON position.