Electric Suspension Control Reducing Actuator Heat
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Solution Overview
Problem
Conventional electric suspension apparatuses face challenges in reducing the calorific value of electric actuators while maintaining thrust force, leading to increased heat generation and potential insulation deterioration.
Innovation Solution
The electric suspension control apparatus includes a control unit with a required thrust force calculation unit, frequency band determination units, and limiters to distribute and adjust the thrust force across frequency bands, with lower limits in low-frequency bands and higher limits in high-frequency bands, reducing the calorific value and maintaining ride comfort and steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If current supplied to the electric actuator is increased to secure the thrust force, then the thrust force is maintained, but the calorific value increases
Solution Approach 1:
The control apparatus segments the thrust force requirement into multiple frequency bands (low frequency band and high frequency band). By dividing the control signal into frequency components, the system can apply different limit values to each band, allowing thrust force maintenance while reducing overall calorific value through selective limiting.
Solution Approach 2:
The system changes the parameter of limit value based on frequency bands. Different limit values are set for different frequency bands, with the low frequency band having a smaller limit value than the high frequency band. This parameter differentiation allows optimization of thrust force delivery while controlling heat generation.
2Temperature
If the limit value in the low frequency band is set smaller than in the high frequency band, then the calorific value is reduced, but the thrust force distribution must be optimized
Solution Approach 1:
The control system dynamically adjusts limit values based on frequency content of the thrust force requirement. The frequency band determination unit dynamically separates the signal into frequency bands, and the limiters dynamically apply appropriate limit values. This dynamic adaptation reduces calorific value while maintaining ride comfort and steering stability.
Solution Approach 2:
The control apparatus uses feedback from the frequency band determination to adjust the limiting action. The output from the frequency band determination unit feeds into the limiters, creating a closed-loop control system that automatically optimizes thrust force distribution across frequency bands to reduce calorific value.
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
This configuration effectively reduces the calorific value of the electric actuator, preventing insulation deterioration and irreversible flux losses, while ensuring ride comfort and steering stability by optimizing thrust force distribution across frequency bands.
Implementation Method 1
an electric actuator including a stator and a movable element supported so as to be movable relatively linearly to each other
Implementation Method 2
increasing a current supplied to the electric actuator to secure the thrust force leads to an increase in a calorific value
Data Source
AI summary
The controller inputs a required thrust force value calculated by a required thrust force calculation unit, to a low frequency filter and a high frequency filter. Output values of the low frequency filter and the high frequency filter are amplitude-limited by a low frequency limiter and a high frequency limiter, respectively. Output values of the low frequency limiter and the high frequency limiter are added, and the added value is output into an inverter as a thrust force instruction value. In this case, a limit value of the low frequency limiter is set to be smaller than a limit value of the high frequency limiter.