Air conditioner, and device and method for preventing cold air during heating of air conditioner
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Solution Overview
Problem
Existing air conditioner systems fail to accurately determine the load during heating, leading to potential overpressure and safety hazards, and lack intelligent control over the blower fan and air deflector, resulting in uncomfortable user experiences and inefficient cold air prevention.
Innovation Solution
A device and method that integrate temperature detection, compressor operation duration, and current intensity to determine the optimal timing for entering and exiting cold air prevention modes, adjusting the blower fan speed and air deflector position accordingly, based on predefined temperature ranges and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the blower fan is delayed from starting to prevent cold air, then cold air blowing is prevented, but the indoor high pressure rises faster and the system cannot accurately determine load
Solution Approach 1:
The patent implements feedback control by continuously monitoring the evaporator temperature and comparing it with preset thresholds. The control unit adjusts the blower fan operation based on real-time temperature feedback, ensuring accurate load determination while preventing cold air blowing. This closed-loop feedback mechanism resolves the contradiction by providing precise measurement capability during the delayed fan operation period.
Solution Approach 2:
The patent replaces traditional mechanical delay timers with an electronic control system that uses temperature sensors and microprocessor-based logic. This substitution enables precise measurement of evaporator temperature and accurate determination of system load, eliminating the measurement imprecision that would result from simple mechanical delay mechanisms.
2Measurement precision
If the blower fan is started immediately, then the system can determine load accurately, but cold air will be blown causing discomfort
Solution Approach 1:
The patent applies preliminary action by pre-heating the evaporator before starting the blower fan. The control unit monitors evaporator temperature and only initiates fan operation after the evaporator reaches a preset temperature threshold, ensuring that no cold air is blown. This preliminary heating action resolves the contradiction by preparing the system in advance to meet both measurement accuracy and comfort requirements.
Solution Approach 2:
The patent implements preliminary anti-action by preventing the blower fan from operating during the period when the evaporator temperature is below the threshold. This preliminary restriction on fan operation counteracts the potential harmful effect of cold air blowing before it can occur, while the control system continuously monitors temperature to ensure accurate load determination throughout the process.
3Ease of operation
If fixed temperature threshold is used for cold air prevention, then control is simple, but it cannot adapt to different temperature ranges and load conditions
Solution Approach 1:
The patent implements dynamic control by using multiple temperature thresholds corresponding to different operating conditions. The control unit dynamically selects the appropriate threshold based on the current temperature range and system state, allowing the system to adapt to various load conditions while maintaining straightforward control logic. This dynamic threshold adjustment resolves the contradiction between simplicity and adaptability.
Solution Approach 2:
The patent changes the temperature threshold parameter based on operating conditions. Different preset thresholds are applied for different temperature ranges and load scenarios, allowing the system to adapt to varying conditions. This parameter change strategy maintains control simplicity through predefined thresholds while achieving versatility across different operating situations.
4Device complexity
If current intensity monitoring is not implemented, then the control system is simpler, but system abnormalities cannot be detected leading to overpressure hazards
Solution Approach 1:
The patent implements feedback control by continuously monitoring current intensity and comparing it with preset thresholds. The control unit uses this current feedback to detect system abnormalities such as overpressure conditions and adjusts operation accordingly. This feedback mechanism enhances system reliability without significantly increasing complexity, as it uses standard sensing and comparison logic.
Solution Approach 2:
The patent enables the system to self-monitor its own operational state through current intensity sensing. The control unit automatically detects abnormalities and takes corrective action without external intervention, improving reliability through self-diagnosis capabilities. This self-service approach adds minimal complexity while significantly enhancing system safety.
Data Source
AI summary
An air conditioner, and a device and method for preventing cold air during heating of the air conditioner are provided, including: detecting an indoor ambient temperature and an outdoor ambient temperature respectively; determining whether an evaporator inner-tube temperature satisfies an evaporator inner-tube temperature condition, or whether a duration reaches an operating duration, or whether a current intensity continuously reaches a first preset current intensity threshold for a predetermined duration; when if so, starting an inner blower fan at a first preset wind speed; determining whether the evaporator inner-tube temperature satisfies the evaporator inner-tube temperature condition, or whether the current intensity continuously reaches a second preset current intensity threshold for a predetermined duration, or whether a duration, for which the inner blower fan operates at the first preset wind speed, reaches a first preset duration; and if so, switching the inner blower fan to operate at a second preset wind speed.