Vehicle Control Apparatus Feedforward Acceleration Zeroing
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Solution Overview
Problem
Existing vehicle control apparatuses face challenges in accurately maintaining inter-vehicle distance when the own vehicle sensor cannot detect the preceding vehicle, leading to potential excessive decrease in inter-vehicle distance due to incorrect acceleration control.
Innovation Solution
The control apparatus includes an own vehicle sensor, a wireless communication device, and an acceleration/deceleration control device with first, second, and third calculation means to calculate feedback and feedforward requested accelerations, setting the feedforward requested acceleration to zero when the preceding vehicle is not detected to prevent excessive inter-vehicle distance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the own vehicle sensor cannot detect the preceding vehicle (due to guardrail reflection or other reasons), then the conventional apparatus cannot obtain accurate inter-vehicle distance information, but the feedforward control continues to execute acceleration based on received acceleration information, causing excessive decrease in inter-vehicle distance
Solution Approach 1:
The control apparatus continuously monitors detection status of the own vehicle sensor and uses this feedback to dynamically adjust the feedforward requested acceleration. When detection fails, the system sets feedforward acceleration to zero, preventing harmful acceleration while maintaining system stability.
Solution Approach 2:
The system dynamically adjusts the feedforward requested acceleration based on real-time detection conditions. The acceleration value changes from normal operation to zero when detection fails, creating a dynamic control system that adapts to changing environmental conditions.
2Ease of operation
If the own vehicle sensor receives reflected waves from both the preceding vehicle and guardrail simultaneously, then detection accuracy deteriorates temporarily, but the system needs to maintain smooth following control
Solution Approach 1:
The system prepares by continuously monitoring detection status and pre-sets the feedforward acceleration to zero before actual detection failure occurs. This preliminary action ensures smooth transition and prevents abrupt control changes when detection temporarily fails due to guardrail reflections.
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
This solution ensures accurate following of the preceding vehicle while maintaining a stable inter-vehicle distance, preventing excessive decrease and ensuring smooth restart of vehicle detection and travel control.
Implementation Method 1
The own vehicle sensor outputs an output wave ahead of the own vehicle and when a preceding vehicle, which is a vehicle traveling in front of the own vehicle, exists, the own vehicle sensor receives a wave reflected by the preceding vehicle.
Data Source
AI summary
The invention relates to a control apparatus of a vehicle. The apparatus calculates a requested acceleration of an own vehicle on the basis of feedback and feedforward requested accelerations and executes a following travel control for causing the own vehicle to travel following a communicating preceding vehicle by controlling an acceleration of the own vehicle such that the acceleration of the own vehicle corresponds to the requested acceleration. The apparatus sets the feedforward requested acceleration to zero when an own vehicle sensor device has not detected the preceding vehicle and the feedforward requested acceleration is larger than zero after starting an execution of the following travel control.