Asymmetric Motor Drive Control for Vehicle Electric Pump Noise Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor drive systems for vehicle electric pumps are prone to erroneous control and delayed fluid transfer due to noise in the communication signal, which can lead to step-out issues in synchronous motors and operational failures in transmission systems during engine stoppages.
Innovation Solution
A motor drive device and method that sets a faster control response for increasing motor control amounts compared to decreasing amounts, using a response setting unit to manage target values and actual motor rotation speeds, thereby suppressing noise-induced errors and maintaining hydraulic pressure in vehicle transmission systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If delay processing is applied to suppress noise-induced erroneous control, then reliability of motor control is improved, but response speed of fluid transfer amount and fluid pressure increases
Solution Approach 1:
The patent applies dynamic adjustment of control response characteristics by switching between two different delay periods (first delay period for increase instructions, second delay period for decrease instructions) based on the direction of control amount change. This dynamic approach allows the system to optimize between noise suppression and response speed for different operational scenarios, resolving the contradiction between reliability and speed.
Solution Approach 2:
The patent changes the parameter of delay period duration based on the direction of control amount change (increase vs. decrease). By setting different delay periods for different directions, the system adapts the noise suppression strength according to operational needs, allowing faster response when pressure needs to increase while maintaining reliability during pressure decrease, thus resolving the contradiction between reliability and response speed.
2Reliability
If uniform delay processing is applied to both increase and decrease instructions, then noise suppression is improved, but fluid pressure response during engine stoppage deteriorates
Solution Approach 1:
The patent introduces asymmetry in the control system by applying different delay periods for increase instructions versus decrease instructions. The first delay period (for increase) is set shorter than the second delay period (for decrease), creating an asymmetric response that prioritizes fast pressure buildup during engine stoppage while still providing noise suppression. This asymmetric approach resolves the contradiction between noise suppression capability and hydraulic pressure response time.
Data Source
AI summary
A motor drive device and a motor drive method for a vehicle electric pump. The device and the method set a target value according to an instruction value of a motor control amount and control the motor of the vehicle electric pump based on the target value. When the instruction value is greater than an actual control amount, the instruction value is set to the target value. Meanwhile, when the instruction value is less than the actual control amount, the actual control amount is set to the target value when the actual control amount is less than a value less than a previous target value by a predetermined value, and the value less than previous target value by predetermined value is set to the target value of this time when the actual control amount is greater than the value less than previous target value by predetermined value.