Vehicle Deceleration Support Control for Driver Intent Matching
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Solution Overview
Problem
Existing vehicle controllers may cause the actual deceleration of a vehicle to deviate from the driver's intended deceleration, leading to discomfort due to inappropriate execution of deceleration support control based on fixed accelerator pedal positions.
Innovation Solution
A vehicle controller that adjusts deceleration based on peripheral information, driver intention, and vehicle state by using a CPU, RAM, ROM, and microcomputer to control a braking device, determining deceleration support conditions through change in accelerator opening degree and driving force, and updating deceleration accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deceleration support control is executed based on fixed accelerator pedal positions, then the control can be simplified and executed reliably, but the actual deceleration may deviate from the driver's intention causing discomfort
Solution Approach 1:
The patent applies dynamics by transitioning from static accelerator pedal position thresholds to dynamic monitoring of accelerator opening degree changes over time. The control system now adapts to the driver's actual deceleration intention by continuously tracking the rate of change of accelerator opening degree, ensuring the vehicle responds naturally to driver input while maintaining reliable deceleration support control.
2Productivity
If deceleration support control is executed when accelerator pedal is returned, then braking force can be generated to support deceleration, but the control may execute inappropriately during accelerator pedal operation causing deceleration deviation
Solution Approach 1:
The patent implements feedback by continuously monitoring the accelerator opening degree and its rate of change over time. This feedback mechanism allows the control system to distinguish between genuine deceleration intentions (where accelerator opening degree changes slowly) and normal accelerator operations (where changes are rapid), thereby executing deceleration support only when appropriate and maintaining accurate deceleration control.
3Device complexity
If the starting condition for deceleration support is based only on accelerator pedal position, then the control logic is simpler, but it cannot accurately determine driver's deceleration intention
Solution Approach 1:
The patent applies parameter changes by introducing the rate of change of accelerator opening degree as a new control parameter. Instead of relying solely on absolute accelerator pedal position, the system now monitors how quickly the accelerator opening degree changes over time. This additional parameter enables accurate detection of driver deceleration intention while keeping the control logic relatively simple through clear threshold-based decision making.
Data Source
AI summary
A vehicle controller includes: an acquisition unit for obtaining peripheral information of the vehicle, a calculation unit for calculating a basic request deceleration, a support unit for executing a deceleration support control by controlling a requested deceleration when a starting condition is satisfied; and a control unit for controlling a braking device. Further, the starting condition refers to a case where the change amount per unit time of the accelerator opening degree is less than a predetermined change threshold, and the requested driving force is less than a predetermined deceleration threshold, and the support unit updates the requested deceleration to the basic request deceleration if the accelerator pedal is being operated in a direction in which it is returned during an execution of the deceleration support control, and maintains the requested deceleration if the accelerator opening degree does not change during the execution of the deceleration support control.