Vehicle Air Conditioning Control Clock Synchronization
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Solution Overview
Problem
Existing air conditioning control devices for vehicles face issues with erroneous operation due to time differences between the clock of a portable information terminal and the vehicle's clock, leading to unintended air conditioner activation.
Innovation Solution
An air conditioning control device that senses the vehicle's ignition off time and communicates with a portable information terminal to determine the presence of a pre-air-conditioning setting, then calculates and compares the time difference between the two clocks, preventing air conditioner operation if the difference exceeds a predetermined threshold (typically 30 minutes to 2 hours).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-air-conditioning control is executed based on time set at a portable information terminal, then convenience of remote operation is improved, but reliability deteriorates due to clock time differences causing erroneous operation
Solution Approach 1:
The system obtains the vehicle's clock time through communication between the portable information terminal and the vehicle, compares it with the terminal's clock time, and uses this feedback to determine whether to execute pre-air-conditioning control. This feedback mechanism ensures that the system operates reliably even when clock times differ, preventing erroneous activation while maintaining remote operation convenience.
2Device complexity
If clock time difference is not checked, then device complexity is reduced, but harmful factors increase due to unintended air conditioner activation
Solution Approach 1:
The system performs a clock time difference check before executing pre-air-conditioning control. This preliminary action prevents erroneous operation by verifying that the time difference between the portable terminal and vehicle clocks is within an acceptable range, thereby eliminating harmful factors without significantly increasing device complexity.
3Productivity
If pre-air-conditioning is activated without time verification, then productivity is improved by pre-cooling/pre-heating cabin, but loss of information occurs when operation does not match user intent
Solution Approach 1:
The system uses feedback from clock time comparison to verify whether pre-air-conditioning activation aligns with user intent. By checking the time difference between the portable terminal and vehicle clocks, the system ensures that pre-cooling or pre-heating operations are performed only when they match the user's intended timing, preventing loss of information regarding user preferences.
Data Source
AI summary
An air conditioning control device senses a turning off of an ignition or a power supply of a vehicle, and stores a time of the turning off that is sensed at the vehicle, and stores a time of the turning off that is acquired by communication of a portable information terminal with the vehicle, and senses an advance setting command for pre-air-conditioning that operates an air conditioner of the vehicle, and determines absence or presence of the advance setting command, and, in a case in which it is determined that there is the advance setting command, instructs of execution of pre-air-conditioning control of the air conditioner on the basis of the time of the turning off that is sensed at the vehicle and the time of the turning off that is acquired by the communication of the portable information terminal with the vehicle.