System and method for starting-up a vehicular air-conditioning system
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Solution Overview
Problem
Vehicular air-conditioning systems face component failure due to simultaneous energization of electrically driven components, leading to potential health risks and discomfort for drivers, especially in high heat conditions where continuous operation is necessary.
Innovation Solution
A method for starting up a vehicle air-conditioning system that sequentially measures and ramps up power to the blower fan, condenser fan, and compressor, using predefined current thresholds to determine proper operation and prevent excessive load, thereby detecting and preventing component failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If all electrically driven components (blower fan, condenser fan, compressor) are energized simultaneously when the air-conditioning system is turned on, then the system starts up quickly, but component failure risk increases due to excessive load
Solution Approach 1:
The system performs preliminary actions by sequentially energizing components in a specific order (blower fan first, then condenser fan, then compressor) rather than simultaneously. Current measurements are taken at each stage to verify proper operation before proceeding to the next component, preventing excessive load and component failure.
2Measurement precision
If the system uses sequential startup with current measurements to detect component failure, then component failure detection accuracy improves, but system complexity increases
Solution Approach 1:
The system incorporates feedback mechanisms by measuring current at each startup stage and comparing it against expected values. The controller adjusts system operation based on these measurements, enabling accurate component failure detection while managing complexity through structured sequential control.
Data Source
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AI summary
The invention includes methods, devices, and systems for starting-up a vehicle air-conditioning system. A method is performed at a vehicle air-conditioning system including a blower fan, a condenser fan, and a compressor electrically coupled to a battery system. The method includes: (408) starting the blower fan; (410) after starting the blower fan, measuring a first current drawn from the battery system, the first current indicative of current drawn by the blower fan; (412) in accordance with a determination that the first current meets predefined criteria, starting the condenser fan; (414) after starting the condenser fan, measuring a second current drawn from the battery system, where the difference between the second current and the first current is indicative of current drawn by the condenser fan; and (416) in accordance with a determination that the second current meets predefined second criteria, starting the compressor.