Parking Assistance Steering Delay Compensation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing parking assistance systems face deviations between target and actual routes due to response delays between electric power steering and actual tire angles, leading to increased reverse turning and discomfort for the driver.

Innovation Solution

A parking assistance device and method that includes a setting unit for setting a vehicle's movement route, a generation unit for generating control data considering response delays in steering and tire angles, and a control unit for adjusting the electric power steering, using tire angle and steering delay calculations to prevent route deviations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If steering control is performed based on a predicted movement locus, then parking assistance is provided to the driver, but a deviation between the target route and actual route occurs due to response delay between steering angle and actual tire angle

Engineering Contradiction:

Improveparking assistanceVSAvoidroute accuracy

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The system calculates the required steering angle in advance, considering the response delay characteristics of the electric power steering system. By determining the steering angle that accounts for the time lag between command and actual tire angle change, the system performs preliminary compensation to ensure the vehicle follows the target route accurately.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system pre-calculates and applies compensation values for the response delay before it causes actual route deviation. By anticipating the delay and adjusting the steering angle command accordingly, the system cushions against the expected deviation, maintaining route accuracy throughout the parking maneuver.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Manufacturing precision

If the steering angle is adjusted to compensate for response delay, then route accuracy is improved, but the control system complexity increases

Engineering Contradiction:

Improveroute accuracyVSAvoidcontrol system

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The system modifies the steering angle parameter by adding a calculated compensation value that accounts for response delay. This parameter change approach allows the system to maintain route accuracy through mathematical adjustment rather than adding complex physical components or multiple control loops.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3124361B1Parking assistance device, parking assistance method, and non-transitory computer readable medium storing program

Publication Date: 2018.08.29 AISIN SEIKI KK

Figure 1~2
Figure 3
Figure 4

AI summary

A parking assistance device (100) includes: a setting unit (206) that sets a movement route of a vehicle (1) with an electric power steering (13) when parking assistance is activated in the vehicle; a generation unit (14) that generates control data equivalent to a changed steering angle curve which has taken into consideration a response delay between the output steering angle of the electric power steering and an actual tire angle in advance, based on the set movement route; and a control unit (13) that controls the electric power steering based on the control data.