Vehicle Compressor Speed Control for Cooling and NVH Balance
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Solution Overview
Problem
Air conditioning systems in hybrid electric vehicles face noise, vibration, and harshness (NVH) issues at certain compressor operating speeds, which are influenced by vehicle status and environment, affecting driver perception and tolerance.
Innovation Solution
A control system that uses environment and vehicle status sensors to determine a maximum operating speed for the compressor, adjusting its speed based on sensed parameters to optimize performance and reduce NVH, by comparing a target speed with a maximum speed determined by both environment and status parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compressor speed is increased to improve cooling efficiency, then cooling performance is improved, but NVH (noise, vibration, and harshness) increases
Solution Approach 1:
The patent applies dynamics by making the compressor operating speed variable rather than fixed. The control system dynamically adjusts the compressor speed based on real-time conditions including vehicle speed, cabin temperature, and driver preferences, allowing the system to optimize between cooling efficiency and NVH reduction by selecting appropriate speed levels under different operating conditions
Solution Approach 2:
The patent changes the operating parameters of the compressor by adjusting its rotational speed based on multiple inputs including ambient temperature, cabin temperature, vehicle speed, and driver tolerance settings. This parameter adjustment allows the system to achieve optimal cooling performance while minimizing NVH by operating at lower speeds when full cooling capacity is not required
2Loss of time
If compressor speed is increased to cool the cabin more quickly, then cooling speed is improved, but driver tolerance to NVH decreases
Solution Approach 1:
The system dynamically adjusts compressor speed based on the time-sensitive nature of cooling requirements and driver tolerance. When rapid cooling is needed and driver tolerance is high, the system operates at higher speeds to reduce cooling time. When driver tolerance is low or vehicle speed is high (masking NVH), the system reduces compressor speed to minimize perceived NVH while maintaining adequate cooling
Solution Approach 2:
The control system changes the compressor operating parameters by adjusting speed levels based on driver tolerance settings and environmental conditions. This allows the system to optimize the trade-off between cooling speed and driver comfort, selecting appropriate speed parameters that balance rapid cooling with acceptable NVH levels
3Object-affected harmful factors
If vehicle speed is low, then driver sensitivity to NVH increases, but cooling demand may still be high
Solution Approach 1:
The system uses feedback from multiple sensors including vehicle speed sensors, temperature sensors, and driver preference inputs to continuously monitor operating conditions. When vehicle speed is low and driver sensitivity to NVH is high, the feedback loop triggers reduced compressor speed operation, while still maintaining cooling function through optimized lower-speed operation and climate control adjustments
Data Source
AI summary
A vehicle compressor is controlled based on an environment parameter and a vehicle status parameter. In at least one embodiment, a temperature control system for a vehicle including an engine is provided. The system includes a compressor having a target operating speed. The system also includes an environment sensor arrangement configured to sense an environment parameter and a vehicle status sensor arrangement configured to sense a vehicle status parameter. The system further includes a control module that determines a maximum operating speed of the compressor as a function of both the environment parameter and the vehicle status parameter. The control module limits an operating speed of the compressor to the maximum operating speed if the target operating speed is greater than the maximum operating speed.