Driving Control Device Deceleration Adjustment for ACC Comfort
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Solution Overview
Problem
Adaptive cruise control (ACC) systems face challenges in maintaining a safe inter-vehicle distance and comfort during deceleration, particularly when the rate of change of deceleration of the preceding vehicle differs from that of the own vehicle, leading to discomfort for the driver due to premature deceleration.
Innovation Solution
A driving control device equipped with a radar system and a computer system that adjusts target deceleration based on the inter-vehicle distance and relative deceleration, using a deceleration correction part to minimize the difference in deceleration between vehicles and reduce discomfort by increasing deceleration when the inter-vehicle distance is less than a predetermined value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the deceleration start timing is advanced to ensure safe deceleration when the preceding vehicle has higher braking response characteristics, then the safety of deceleration control is improved, but the driver comfort deteriorates due to excessive early deceleration
Solution Approach 1:
The patent changes the parameter of deceleration timing based on the detected deceleration jerk of the preceding vehicle. When high deceleration jerk is detected, the system adjusts the deceleration start timing to ensure safety while limiting the maximum deceleration value to maintain comfort. This dynamic parameter adjustment resolves the contradiction by adapting the control strategy to the specific braking characteristics of the preceding vehicle.
Solution Approach 2:
The system dynamically adjusts deceleration control parameters based on real-time detection of the preceding vehicle's deceleration characteristics. By continuously monitoring deceleration jerk and adapting the deceleration profile, the system transitions from static to dynamic control, allowing it to balance safety and comfort based on actual driving conditions rather than using fixed conservative timing.
2Productivity
If the target deceleration is increased to maintain a smaller inter-vehicle distance, then the productivity of the following control is improved, but the driver comfort deteriorates due to harsh deceleration
Solution Approach 1:
The patent dynamically changes the target deceleration parameter based on the inter-vehicle distance and the deceleration characteristics of the preceding vehicle. By adjusting the deceleration profile to match the preceding vehicle's behavior while maintaining appropriate spacing, the system achieves efficient following control without imposing harsh deceleration on the driver, thus resolving the contradiction between productivity and comfort.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively maintains a safe inter-vehicle distance and reduces driver discomfort by adjusting deceleration to match the preceding vehicle's deceleration, suppressing the increase in inter-vehicle distance and minimizing the maximum deceleration value, providing a more comfortable driving experience.
Implementation Method 1
The object detection part such as a radar device captures front view images including objects in front of the own vehicle
Data Source
AI summary
A driving control device has a target-following driving control part performing a target-following driving control of a preceding vehicle in front of a vehicle, and a target acceleration setting part setting a target acceleration/deceleration of the vehicle to maintain a inter-vehicle distance between the vehicle and the preceding vehicle within a target inter-vehicle distance during the target-following driving control. The target acceleration setting part increases the target deceleration of the vehicle according to increasing of a difference between the inter-vehicle distance and the target inter-vehicle distance. A deceleration correction part increases the target deceleration when a period during which the preceding vehicle has been continuously recognized is more than a predetermined period and the inter-vehicle distance is less than a predetermined distance.