Electronic Vacuum Pump Alternation for EV Braking Durability
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Solution Overview
Problem
The existing auxiliary vacuum pumps used in internal combustion engine vehicles are not suitable for electric vehicles due to poor durability and insufficient negative pressure provision, which affects the braking performance in electric vehicles.
Innovation Solution
A system and method for controlling a continuously-operable electronic vacuum pump, utilizing two electronic vacuum pumps that operate alternately or concurrently based on vehicle state information, ensuring optimal negative pressure supply to the booster, thereby improving durability, noise reduction, and braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single auxiliary vacuum pump is used in internal combustion engine vehicles, then the device complexity is reduced, but the durability performance deteriorates due to continuous operation requirements in electric vehicles
Solution Approach 1:
The vacuum pump system is segmented into multiple independent vacuum pumps (first vacuum pump and second vacuum pump) that can operate alternately. This segmentation allows each pump to have reduced operating time and cooling periods, thereby improving durability without significantly increasing overall system complexity.
Solution Approach 2:
The system implements periodic action by alternately operating the first and second vacuum pumps based on operating time thresholds. When one pump reaches its maximum operating time, the system switches to the other pump, allowing the first pump to cool down. This periodic operation cycle improves reliability by preventing continuous operation overheating.
2Productivity
If the auxiliary vacuum pump operates continuously to provide sufficient negative pressure, then the braking performance is improved, but the durability performance deteriorates due to excessive operating time
Solution Approach 1:
The continuous operation requirement is segmented across multiple vacuum pumps. The first vacuum pump operates for a limited time threshold, then switches to the second vacuum pump. This segmentation maintains continuous negative pressure provision while limiting individual pump operating time, thereby improving durability.
Solution Approach 2:
The system uses periodic action with alternating operation cycles. Each vacuum pump operates within a defined time threshold, then pauses for cooling while the other pump takes over. This periodic operation ensures sufficient negative pressure is maintained for braking performance while preventing excessive continuous operation that would degrade durability.
3Weight of moving object
If the vacuum pump size is reduced for cost savings and weight reduction, then the manufacturing cost and vehicle weight are improved, but the negative pressure generation capability may deteriorate
Solution Approach 1:
The system segments the negative pressure generation task across multiple smaller vacuum pumps. Each individual pump can be more compact and lighter in weight, but collectively they provide sufficient negative pressure capability. The alternation mechanism ensures that one pump is always available to meet the braking system's negative pressure requirements.
4Device complexity
If a relay-based control system is used to operate the vacuum pump, then the device complexity is reduced, but the durability performance deteriorates due to relay switching limitations
Solution Approach 1:
The system replaces the mechanical relay-based control with an electronic control mechanism implemented in the EVP controller. This electronic control system manages the alternation between vacuum pumps based on operating time thresholds, providing more reliable switching without the durability limitations of mechanical relays, while maintaining acceptable system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances durability and noise reduction by allowing each vacuum pump to cool, reduces size for cost savings and weight, and improves braking performance during rapid deceleration and sudden braking by concurrent operation.
Implementation Method 1
a booster 12 that forms a pressure difference between an atmospheric pressure and a vacuum pressure
Data Source
AI summary
A system for and a method of controlling driving of a continuously-operable electronic vacuum pump includes determining conditions for allowing and disallowing first and second electronic vacuum pumps to operate for each braking situation according to vehicle state information associated with braking. The first and second electronic vacuum pumps are driven individually or concurrently according to the determined braking situation. Thus, an optimal negative pressure optimal suitable for the vehicle state information is easily supplied to a booster.