Vehicle Stopping Control Apparatus for Shock Mitigation

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Solution Overview

Problem

Conventional vehicle stopping control systems fail to effectively mitigate the shock experienced during automatic vehicle stopping, as they struggle to control deceleration accurately and respond to varying vehicle speeds.

Innovation Solution

A control apparatus that includes a speed detector, target setting means for setting target acceleration based on actual vehicle speed, and control means for managing acceleration to prevent excessive deceleration, using feedback and feedforward control to match actual acceleration with the target, and employing a vehicle model to adapt to different speed patterns and response characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional brake actuator control is used to stop the vehicle when target speed becomes equal to or lower than stop control starting speed, then the vehicle can be stopped reliably, but the shock in stopping the vehicle cannot be mitigated

Engineering Contradiction:

Improvereliability of vehicle stoppingVSAvoidshock in stopping the vehicle

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The control apparatus initiates deceleration control before the vehicle reaches the stop position by detecting approaching distance. The deceleration amount is calculated based on the approaching distance, ensuring that the vehicle slows down gradually before stopping. This preliminary deceleration action prevents sudden braking shock while maintaining reliable stopping, as the vehicle is already moving at reduced speed when it reaches the stop position.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control apparatus dynamically adjusts the deceleration amount based on the detected approaching distance. When the approaching distance is large, a larger deceleration amount is applied; when the distance is small, a smaller deceleration amount is applied. This dynamic adjustment optimizes the stopping process to mitigate shock while ensuring reliable stopping at the appropriate position.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If the absolute value of target acceleration is decreased as actual speed decreases to mitigate shock, then shock mitigation is improved, but stopping time may be prolonged

Engineering Contradiction:

Improveshock in stopping the vehicleVSAvoidstopping time

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The control apparatus implements periodic control cycles where it detects the approaching distance, calculates the appropriate deceleration amount, and applies braking force in a structured sequence. This periodic action ensures that deceleration is applied in controlled phases rather than continuously, optimizing the balance between shock mitigation and stopping time by adjusting the intensity and timing of deceleration phases.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS8660767B2Apparatus and system for controlling automatic stopping of vehicle

Publication Date: 2014.02.25 DENSO CORP

AI summary

A control apparatus is provided to control the stopping of a vehicle. The control apparatus comprises a speed detector that detects a speed of a vehicle, speed acquiring means, target setting means, and control means. The speed acquiring means acquires an actual speed of the vehicle from detected results of the speed detector. The target setting means sets a target acceleration of the vehicle depending on the actual speed when the vehicle is stopped automatically. The control means controls an actual acceleration of the vehicle at the target acceleration.