Vehicle Suspension Damping Control for Left-Right Wheel Phase Inputs

Solution Overview

Problem

Existing damping control systems fail to appropriately reflect left and right wheel anti-phase and in-phase inputs due to excessive filtering, leading to degraded control effectiveness.

Innovation Solution

Implement a method using a control map with filtering processing that includes a first high-pass filter to retain left and right wheel anti-phase inputs, and optionally additional high-pass filters to manage in-phase inputs, calculating actuator control amounts based on these inputs to maintain effective damping control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a high-pass filter is used to cut out extremely low frequency components from vertical motion data, then elevation change interference is reduced, but left and right wheel anti-phase input is also cut out

Engineering Contradiction:

Improvevertical motion parameter accuracyVSAvoidleft and right wheel anti-phase input

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent segments the vertical motion parameters into two distinct components: left and right wheel in-phase input (representing elevation changes) and left and right wheel anti-phase input (representing road surface irregularities). By separating these components through coordinate transformation, the system can apply different filtering strategies to each component, preserving the anti-phase input while removing excessive low-frequency content from the in-phase input.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different filtering characteristics to different components of the vertical motion data. Specifically, a first high-pass filter with a first cutoff frequency is applied to the in-phase input to remove elevation change effects, while a second high-pass filter with a second cutoff frequency (higher than the first) is applied to the anti-phase input to preserve road surface information. This localized filtering approach resolves the contradiction by treating different frequency components differently.

Inventive Principle:

Principle #3Local quality

2Loss of information

If a weak high-pass filter is used to preserve left and right wheel anti-phase input, then anti-phase input is retained, but left and right wheel in-phase input from elevation change remains

Engineering Contradiction:

Improveleft and right wheel anti-phase inputVSAvoidelevation change interference

Core Design Contradiction:

Loss of informationVSObject-affected harmful factors

Solution Approach 1:

The patent segments the vertical motion parameters into two distinct components: left and right wheel in-phase input (representing elevation changes) and left and right wheel anti-phase input (representing road surface irregularities). By separating these components through coordinate transformation, the system can apply different filtering strategies to each component, preserving the anti-phase input while removing excessive low-frequency content from the in-phase input.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different filtering characteristics to different components of the vertical motion data. Specifically, a first high-pass filter with a first cutoff frequency is applied to the in-phase input to remove elevation change effects, while a second high-pass filter with a second cutoff frequency (higher than the first) is applied to the anti-phase input to preserve road surface information. This localized filtering approach resolves the contradiction by treating different frequency components differently.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If excessive filtering is applied to create the control map, then low frequency noise is reduced, but control effectiveness degrades due to loss of wheel input information

Engineering Contradiction:

Improvecontrol map accuracyVSAvoiddamping control effectiveness

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent segments the vertical motion parameters into two distinct components: left and right wheel in-phase input (representing elevation changes) and left and right wheel anti-phase input (representing road surface irregularities). By separating these components through coordinate transformation, the system can apply different filtering strategies to each component, preserving the anti-phase input while removing excessive low-frequency content from the in-phase input.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different filtering characteristics to different components of the vertical motion data. Specifically, a first high-pass filter with a first cutoff frequency is applied to the in-phase input to remove elevation change effects, while a second high-pass filter with a second cutoff frequency (higher than the first) is applied to the anti-phase input to preserve road surface information. This localized filtering approach resolves the contradiction by treating different frequency components differently.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20260061796A1Vehicle damping control method and damping control system

Publication Date: 2026.03.05 TOYOTA JIDOSHA KK

AI summary

A method includes calculating a predicted passing position of each wheel of a vehicle after a preview period from a current time, acquiring a parameter related to vertical motion of each wheel at the predicted passing position from a parameter map, calculating a left and right wheel in-phase input of a first wheel and a second wheel and a left and right wheel anti-phase input of the first wheel and the second wheel, and calculating each control amount of an actuator that controls suspension strokes of the first and second wheels based on the left and right wheel anti-phase input and the left and right wheel in-phase input.