Electronic Vacuum Pump Threshold Control Without GPS Altitude
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Solution Overview
Problem
Conventional methods for determining vacuum degree thresholds in electronic vacuum pumps of electric vehicles are inaccurate due to reliance on GPS altitude data, which fails to provide precise adjustments under varying atmospheric pressures, affecting pump longevity and performance.
Innovation Solution
A method and apparatus that utilize current altitude signals and historical data to adjust vacuum degree thresholds based on actual working times, updating these thresholds when deviations exceed predetermined ranges, and incorporating atmospheric pressure adjustments using updated altitude data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If GPS altitude data is used to determine vacuum degree threshold, then the system can operate with a simple determination method, but the accuracy of vacuum degree threshold determination deteriorates when GPS data is unavailable
Solution Approach 1:
The patent introduces atmospheric pressure as an intermediary parameter to bridge the gap between GPS altitude data and vacuum degree threshold determination. When GPS data is unavailable, the system uses atmospheric pressure sensors to directly measure environmental pressure, which then serves as the basis for determining the vacuum degree threshold, bypassing the need for GPS-altitude-correlation calculations.
Solution Approach 2:
The system dynamically changes the determination parameter from GPS-based altitude to atmospheric pressure-based direct measurement. By switching between these parameters based on data availability, the system maintains both operational simplicity and determination accuracy across different operating conditions.
2Adaptability or versatility
If vacuum degree threshold is adjusted according to GPS altitude, then the system can adapt to different altitudes, but the reliability deteriorates when GPS signal is lost
Solution Approach 1:
The system performs preliminary calibration by storing the relationship between atmospheric pressure and vacuum degree threshold before actual operation. This pre-established correlation allows the system to immediately use atmospheric pressure measurements for accurate threshold determination without relying on GPS, ensuring continuous reliable operation.
Solution Approach 2:
The system implements feedback mechanisms where actual vacuum pump performance data is continuously monitored and used to refine the atmospheric pressure-threshold correlation. This feedback loop enhances the reliability of threshold determination by adapting to actual operating conditions rather than relying solely on theoretical GPS-based calculations.
3Reliability
If vacuum pump works longer time under low atmospheric pressure to reach shutdown threshold, then the pump can maintain required vacuum level, but the service life of the vacuum pump deteriorates
Solution Approach 1:
The system changes the vacuum degree threshold parameter dynamically based on atmospheric pressure conditions. Under low atmospheric pressure, the threshold is adjusted to account for the reduced pressure differential, allowing the pump to shut down earlier while still maintaining adequate vacuum levels, thereby reducing cumulative operating time and extending service life.
Solution Approach 2:
The vacuum degree threshold is made dynamic rather than fixed, adapting in real-time to atmospheric pressure variations. This dynamic adjustment optimizes the balance between maintaining required vacuum performance and minimizing unnecessary pump operation, particularly under varying atmospheric conditions.
Data Source
AI summary
A method for determining a vacuum degree threshold is provided including: acquiring the current altitude signal of a vehicle; when the current altitude signal is invalid, acquiring a vacuum degree threshold and a standard working time, which correspond to a historical altitude signal received by an electronic vacuum pump of the vehicle last time, the vacuum degree threshold includes a vacuum degree turn-on threshold value and a vacuum degree turn-off threshold; acquiring the actual working time of the vacuum degree threshold corresponding to the historical altitude signal of the electronic vacuum pump when the current working cycle is completed; and when the difference between the actual working time and the standard working time exceeds a preset range, updating, according to the difference, the vacuum degree threshold corresponding to the historical altitude signal, and taking the updated vacuum degree threshold as a target vacuum degree threshold of the next working cycle.