Adaptive Vacuum Pump Control for Altitude Reliability
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Solution Overview
Problem
Vacuum pumps in motor vehicles fail to switch off at high altitudes due to decreasing absolute switching pressure, leading to prolonged running times and potential damage, as existing control methods either fail to adapt to altitude changes or result in reduced differential pressure, causing operational failures.
Innovation Solution
A method for controlling a vacuum apparatus that determines and adapts pump control signals to ambient pressure, ensuring both switching on and off thresholds are maintained across altitudes by using a controller that compares the accumulator pressure with adapted signals, preventing over-running and optimizing pump operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed switching thresholds are used for pump control, then the control system is simple, but the differential pressure decreases at high altitudes causing pump failure to switch on
Solution Approach 1:
The patent applies parameter changes by adapting the pump switching thresholds based on ambient pressure conditions. Instead of using fixed thresholds, the control system dynamically adjusts the switching parameters according to the detected ambient pressure, ensuring reliable pump operation across different altitudes while maintaining a relatively simple control architecture
2Reliability
If ambient pressure adaptation is implemented, then pump switching reliability improves at all altitudes, but device complexity increases due to additional sensors and control logic
Solution Approach 1:
The patent implements universality by designing a control system that uses a single ambient pressure sensor to serve multiple functions: detecting altitude changes, determining when to switch the pump on and off, and adapting control parameters dynamically. This multi-functional approach improves reliability across all altitudes while minimizing the increase in device complexity
3Duration of action of stationary object
If pump running time is limited to prevent damage, then pump service life is extended, but vacuum supply may become insufficient
Solution Approach 1:
The patent applies dynamics by making the pump control adaptive rather than static. The control system continuously monitors ambient pressure and dynamically adjusts the pump operation timing and thresholds, allowing the pump to run longer when necessary at high altitudes while preventing damage through intelligent time management, thus balancing service life extension with reliable vacuum supply
Data Source
AI summary
Method and device for controlling a vacuum apparatus. A method for controlling a vacuum apparatus that applies vacuum to a vacuum accumulator with a pump of a pneumatically operated servo unit of a motor vehicle. The method comprises the steps of determining the pressure in the vacuum accumulator; determining the ambient pressure; adapting a pump control signal to the ambient pressure; comparing the pressure in the vacuum accumulator with an adapted pump control signal; and outputting a pump actuation signal that is a function of the comparison.