Electronic Suspension Control for Smooth Short-Circuit Transition
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Solution Overview
Problem
Existing electronic suspension systems experience abrupt changes in stroke position when switching to short circuit control, leading to uncomfortable rides for occupants due to sudden changes in thrust force.
Innovation Solution
An electronic suspension control apparatus that gradually decreases the thrust force command and performs short circuit control when the thrust force falls below a predetermined value, preventing abrupt changes in stroke position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If short circuit control is switched on abruptly in existing electronic suspension systems, then the response speed and control efficiency are improved, but the stroke position changes abruptly to the natural length causing uncomfortable ride for occupants
Solution Approach 1:
The control device gradually decreases the thrust force command value before switching to short circuit control, preparing the suspension system in advance for the transition. This preliminary action prevents abrupt changes in stroke position by reducing the thrust force to a predetermined value or lower before the short circuit control is activated, thereby maintaining ride comfort while still achieving timely control response.
2Object-affected harmful factors
If thrust force is decreased gradually before short circuit control, then ride comfort is improved, but the transition time increases
Solution Approach 1:
The control device decreases the thrust force command value gradually only to the extent necessary to prevent abrupt stroke position changes, rather than reducing it completely. This partial action approach maintains ride comfort by avoiding sudden transitions while minimizing the transition time, achieving an optimal balance between comfort and response speed.
3Reliability
If power supply is stopped suddenly, then energy consumption is reduced and safety is improved, but the stroke position changes abruptly causing uncomfortable ride
Solution Approach 1:
Before stopping the power supply to the electric motor, the control device first performs short circuit control by decreasing the thrust force command value to a predetermined value or lower. This preliminary action ensures that the suspension system is prepared for the power interruption, preventing abrupt changes in stroke position when power is cut off, thereby maintaining ride comfort while still achieving safety and energy efficiency goals.
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
Ensures a smooth transition to short circuit control, maintaining ride comfort and reducing vibrations, even when power supply is stopped or emergency conditions arise.
Implementation Method 1
an electromagnetic actuator that, using an electric motor, generates a driving force
Implementation Method 2
The electromagnetic actuator is configured including a ball screw mechanism in addition to the electric motor. This electromagnetic actuator operates to generate a driving power for attenuating vibrations of the vehicle by converting rotational motion of the electric motor into linear motion of the ball screw mechanism.
Implementation Method 3
an electromagnetic actuator that, using an electric motor, generates a driving force for attenuating vibrations of the vehicle
Data Source
AI summary
An electronic suspension control apparatus of the invention is an apparatus that controls an electronic suspension having an electric motor, and under a predetermined operation condition, gradually decreases a thrust force command for the electronic suspension and performs short circuit control on the electric motor once the thrust force command falls to or below a predetermined value. The operation condition is either detection of a command giving a prior notice of stopping power supply to the electronic suspension, a short circuit command as a measure against a collision, detection of a predetermined decelerating vehicle speed, or detection, by a preview sensor, of a change in a road surface which is equal to or above a predetermined value.