Vehicle Speed Control for Curves Beyond Sensor Range
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Solution Overview
Problem
Conventional vehicle control systems fail to ensure safety when obstacles outside the detection range of external environment sensors, particularly on curved routes, leading to potential hazards.
Innovation Solution
A vehicle control device that calculates a target speed using a first speed for stopping before the sensor's range and a second speed for following the route, selecting the minimum speed from these calculations to ensure safe travel and obstacle avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle travels at a higher speed on curved routes, then productivity is improved, but safety deteriorates due to undetected obstacles outside sensor range
Solution Approach 1:
The system performs preliminary calculations of the first speed (based on sensor detection range and stopping distance) and second speed (based on curve geometry and friction) before the vehicle enters the curve. The target speed is determined in advance by comparing these two calculated speeds, ensuring safety constraints are met before high-speed travel begins
Solution Approach 2:
The system proactively counteracts potential safety risks by calculating speed limits that prevent the vehicle from traveling faster than what can be safely stopped within sensor range or navigated through curves. This preliminary anti-action establishes speed constraints before hazardous conditions can develop
2Reliability
If the vehicle speed is reduced to ensure safety, then safety is improved, but productivity deteriorates due to slower travel
Solution Approach 1:
The system dynamically adjusts the target speed parameter based on real-time conditions by changing the calculation parameters (sensor range, friction coefficient, curve radius) and selecting the appropriate speed constraint (first or second speed) that satisfies both safety and efficiency requirements
3Reliability
If the target speed is set based on sensor range and curve geometry, then safety is improved, but device complexity increases due to multiple speed calculations
Solution Approach 1:
The speed control function is segmented into two independent calculation paths: first speed calculation (based on sensor range and stopping distance) and second speed calculation (based on curve geometry and friction). This segmentation allows each calculation to focus on specific safety aspects, making the overall system more manageable and transparent
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
Enhances vehicle safety by preventing collisions with undetected obstacles and maintaining stable vehicle control on curved routes.
Implementation Method 1
a frictional force received by a host vehicle in a direction opposite to a centrifugal force when the host vehicle travels on a curve is larger than the centrifugal force received by the host vehicle
Implementation Method 2
a centrifugal force received by the host vehicle when the host vehicle travels on the curve
Data Source
AI summary
The present disclosure provides a vehicle control device capable of improving safety of a vehicle. A vehicle control device according to the present disclosure includes a target speed calculation unit 126 that calculates a target speed of a vehicle. The target speed calculation unit 126 includes a first speed calculation unit 126a, a second speed calculation unit 126b, and a target speed setting unit 126f. The first speed calculation unit 126a calculates, by using a friction coefficient of a road surface and a route length of a target route to an outer edge of a sensing range of an external environment sensor of the vehicle, a first speed at which the vehicle can stop at a stop position before the outer edge. The second speed calculation unit 126b calculates, by using a curvature radius of the target route of the vehicle and the friction coefficient, a second speed at which the vehicle can follow the target route. The target speed setting unit 126f selects the minimum speed of the first speed and the second speed, and sets the minimum speed as the target speed.