Dynamic Acceleration Control in Motor Vehicle Driver Assistance
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Solution Overview
Problem
Existing driver assistance systems for motor vehicles are limited in their ability to dynamically change target acceleration in response to driver input, leading to discomfort and reduced convenience, particularly when sudden maneuvers are required, as they often deactivate when the brake or accelerator pedals are actuated, necessitating reactivation.
Innovation Solution
A driver assistance system that allows for dynamic adjustment of target acceleration by adding or subtracting additional acceleration based on actuation time, with a control element generating digital signals to change the target acceleration, ensuring the system remains active without reactivation needed, and allowing for both acceleration and deceleration adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver assistance system limits maximum acceleration values to ensure comfortable driving, then driving comfort is improved, but the system cannot respond adequately to sudden maneuvers or emergency situations
Solution Approach 1:
The system dynamically adjusts the maximum acceleration limit based on the actuation time of the accelerator or brake pedal. When the pedal is actuated beyond a first threshold position for longer than a first time period, the system permits acceleration values exceeding the normal maximum limit, while maintaining the normal limit for shorter actuations to ensure comfort
2Reliability
If the driver assistance system deactivates when the brake or accelerator pedal is actuated, then driver intervention is recognized, but the system requires reactivation which reduces convenience
Solution Approach 1:
The driver assistance system remains active and continues to function when the accelerator or brake pedal is actuated beyond the first threshold position. The system seamlessly transitions to permit higher acceleration values during extended pedal actuation without deactivation or requiring reactivation, ensuring continuous operation
3Speed
If the system allows strong acceleration or deceleration to enable overtaking or rapid response, then maneuverability is improved, but driving comfort deteriorates due to sudden jerks
Solution Approach 1:
The system dynamically changes the maximum acceleration limit based on the duration of pedal actuation. For actuation times exceeding the first time period, the system permits acceleration values above the normal maximum, while maintaining the lower comfort-oriented limit for shorter actuations, thus adapting performance to driver intent
Data Source
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Figure 6~7
AI summary
The vehicle (1) has a driver assistance system (6) and a motor (2) to regulate speed of the vehicle. The system (6) controls the motor and/or a brake system (35) based on an estimated acceleration. An operating unit (7) communicates with the system (6), and a digital signal is produced during operation of the operating unit. The system (6) is formed depending on the signal that is transmitted by the operating unit, for changing the estimated acceleration and for controlling the motor and/or the brake system based on the changed estimated acceleration, during operation of the operating unit.