Vehicular air conditioning control method and vehicular air conditioning device
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Solution Overview
Problem
Existing air-conditioning control methods for vehicles face challenges in stabilizing engine torque when restoring compressor capacity from a minimized state, leading to discomfort for vehicle occupants due to variations in torque profiles during changes in compressor capacity.
Innovation Solution
The method involves setting the air-conditioning compressor discharge capacity to a minimum during fuel cutting, temporarily increasing it to the upper limit capacity, and then adjusting it to match the cabin state after a predetermined time, ensuring a stable torque profile and deceleration rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the compressor capacity is restored directly from minimum capacity to the discharge capacity corresponding to the cabin state, then the air-conditioning response is fast, but the torque profile varies causing occupant discomfort
Solution Approach 1:
The compressor capacity restoration process is segmented into multiple stages: first restoring to upper limit capacity, then after a predetermined time delay, restoring to the final discharge capacity corresponding to the cabin state. This segmentation prevents direct restoration that would cause torque profile variations and occupant discomfort.
Solution Approach 2:
The system performs a preliminary action by first restoring the compressor capacity to the upper limit capacity before restoring it to the final required capacity. This preliminary restoration step prepares the system in advance to avoid sudden torque changes that would affect vehicle deceleration stability.
2Use of energy by moving object
If the compressor capacity is set to minimum during fuel cutting, then fuel consumption is reduced, but the air-conditioning performance may be insufficient
Solution Approach 1:
The compressor capacity is dynamically adjusted based on operating conditions: set to minimum capacity during fuel cutting to reduce energy consumption, and restored to upper limit or required capacity when fuel cutting ends or cabin conditions demand it. This dynamic adjustment balances energy efficiency with air-conditioning performance reliability.
Data Source
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AI summary
In the present invention, during control of air-conditioning for a vehicle in which torque satisfying a total value of drive torque of the vehicle and drive torque of an air-conditioning compressor is outputted to an engine, a discharge capacity of the air-conditioning compressor is set to a minimum capacity when fuel of the engine is cut. When it has been assessed that the discharge capacity needs to be changed from the minimum capacity in accordance with a state inside a cabin, the discharge capacity is changed from the minimum capacity to an upper limit capacity allowed during normal operation, and after a predetermined time has elapsed following the change, the discharge capacity is changed from the upper limit capacity to a discharge capacity that corresponds to the state inside the cabin.