Vehicle Temperature Controller Using Motor Phase for Refrigerant Heating
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Solution Overview
Problem
Existing vehicle-mounted air-conditioners struggle to accurately control the heat generated by the electric motor and compressor output in accordance with the blower's operation, leading to inadequate temperature control within the passenger compartment.
Innovation Solution
A vehicle-mounted temperature controller that adjusts the current phase of the drive motor to optimize heat generation, using inefficient drive operations when the blower is off to increase refrigerant temperature and precise control when the blower is on, by shifting the current phase to advanced or retarded sides based on the blower's state, ensuring efficient heat transfer and temperature management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electric motor is driven without the blower performing a blowing operation to raise the temperature of the refrigerant, then the temperature of the refrigerant increases, but the precision of control of the electric motor output deteriorates
Solution Approach 1:
The patent applies dynamics by making the current phase control strategy changeable based on the blower's operation state. The motor control part dynamically selects between two different current phase control modes: one optimized for heat generation when the blower is off, and another optimized for precise output control when the blower is on. This dynamic adaptation resolves the contradiction by allowing the system to optimize for temperature rise when needed while maintaining precise control when the blower is actively cooling or heating the passenger compartment.
2Temperature
If the current phase is controlled to optimize heat generation when the blower is off, then the refrigerant temperature rises effectively, but the control precision of the compressor output deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the current phase parameter of the electric motor based on the blower's operation state. When the blower is off, the current phase is adjusted to a value that maximizes heat generation and refrigerant temperature rise. When the blower is on, the current phase is adjusted to a value that ensures precise compressor output control. This parameter adaptation allows the system to achieve both effective temperature control and precise compressor control under different operating conditions.
3Use of energy by moving object
If the electric motor generates more heat to raise refrigerant temperature when the blower is not blowing, then the heating efficiency improves, but the energy consumption increases
Solution Approach 1:
The patent applies periodic action by alternating between different motor control modes based on the blower's periodic operation. When the blower is off, the system enters a high heat generation mode to efficiently raise refrigerant temperature. When the blower is on, the system switches to a precise control mode that reduces unnecessary heat generation and energy consumption. This periodic switching between control modes optimizes the balance between heating efficiency and energy consumption throughout the air conditioning cycle.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for effective control of heat generation and compressor output, enhancing the precision of temperature control within the passenger compartment by optimizing motor efficiency and heat transfer processes, thereby improving heating and cooling performance.
Implementation Method 1
the electric motor is driven without the blower performing a blowing operation so as to raise the temperature of the refrigerant etc.
Implementation Method 2
a compressor having a compression part compressing a refrigerant and a drive motor driving the compression part and using waste heat accompanying driving of the drive motor to make the temperature of the refrigerant rise
Implementation Method 3
a blower blowing air to a heat exchanger raised in temperature by receiving heat of the refrigerant and blowing air exchanged in heat with the heat exchanger to the inside of the passenger compartment
Data Source
AI summary
A vehicle-mounted temperature controller 100 provided with a compressor 2 having a compression part 2a compressing a refrigerant and a drive motor 2b driving the compression part 2a and using waste heat accompanying driving of the compression part 2a to make the temperature of the refrigerant rise, a blower 61 blowing air to a heater core 145 raised in temperature by receiving heat of the refrigerant and blowing air exchanged in heat with the heater core 145 to the inside of the passenger compartment, and an electronic control unit 51 controlling a current phase of the drive motor 2b to a phase by which a ratio of change of an output of the drive motor 2b to a change of the current phase becomes relatively larger to thereby drive the drive motor 2b by an inefficient drive operation when the blower 61 is in a nondriven state and controlling the current phase to a phase by which a ratio of change of an output of the drive motor 2b to a change of the current phase becomes relatively smaller to thereby drive the drive motor 2b by an inefficiently drive operation when the blower 61 is in a driven state.