Variable Displacement Compressor Control to Reduce Torque Disturbances
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Solution Overview
Problem
Vehicle air conditioning systems experience noticeable torque disturbances when mechanically coupling and decoupling the air conditioner compressor to the energy source, affecting driver comfort and fuel efficiency.
Innovation Solution
The method involves adjusting the air conditioner compressor displacement command before engaging or disengaging it from the energy supply, reducing refrigerant pressurization capacity to minimize torque changes, thereby reducing the noticeable impact on the driveline and engine load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air conditioner compressor is mechanically coupled and decoupled to the energy source, then the cabin temperature can be controlled, but noticeable torque disturbances occur on the driveline
Solution Approach 1:
The compressor displacement is adjusted to a reduced position before the clutch is engaged or disengaged. This preliminary action ensures that torque disturbances are minimized at the critical moment of coupling/decoupling, while still allowing the compressor to provide necessary cooling capacity after engagement.
Solution Approach 2:
The compressor displacement parameter is dynamically adjusted based on operating conditions. By changing the displacement parameter to a reduced position before clutch engagement/disengagement, the system optimizes the balance between cooling performance and driveline torque stability.
2Temperature
If the air conditioner compressor operates at high cooling capacity, then driver comfort is improved, but fuel efficiency decreases due to increased engine load
Solution Approach 1:
The compressor displacement is made dynamically adjustable rather than fixed. The system can switch between reduced displacement (for fuel efficiency) and full displacement (for maximum cooling) modes, allowing optimization of the balance between cooling performance and energy consumption based on real-time conditions.
Solution Approach 2:
The compressor displacement parameter is varied to match actual cooling demands. By reducing displacement when full cooling capacity is not needed, the system decreases engine load and improves fuel efficiency while maintaining adequate cabin temperature control.
Data Source
AI summary
A method for controlling torque of an air conditioner compressor is disclosed. In one example, the air conditioner compressor is a variable displacement compressor. The method may provide smooth transitions between different air conditioner compressor torques.