Radar Transmission Output Control for Pedestrian Safety
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Solution Overview
Problem
In-vehicle radar devices face challenges in reducing or stopping transmission output when not needed, particularly during vehicle stops, to comply with regulatory limits and ensure safety by preventing accidental irradiation of pedestrians or environmental impact.
Innovation Solution
A radar device with transmitting and receiving means, target object measurement, and transmission output control mechanisms that determine and adjust the output based on predetermined conditions, including a switch to stop or reduce transmission and an abnormality determination system to ensure compliance with regulatory limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transmission output is increased to improve detection capability, then the detection range and accuracy are improved, but the safety risk to pedestrians and environmental impact increase
Solution Approach 1:
The radar device dynamically adjusts the transmission output based on the detected state of the subject vehicle. When the vehicle is traveling, the radar transmits at normal power levels for optimal detection. When the vehicle stops, the transmission output is automatically reduced or stopped, eliminating unnecessary radiation exposure to pedestrians while maintaining detection capability during motion.
Solution Approach 2:
The invention changes the transmission output parameter based on the vehicle's operational state. By monitoring whether the vehicle is moving or stationary, the system adjusts the electromagnetic wave transmission intensity accordingly, using high power during travel for better detection and low or zero power during stops for safety.
2Object-affected harmful factors
If the transmission output is stopped or reduced during vehicle stop to ensure safety, then pedestrian safety is improved, but the reliability of transmission output control must be ensured
Solution Approach 1:
The radar device incorporates a feedback mechanism that continuously monitors the transmission output control function. The abnormality determining means receives feedback about the transmission state and compares it with the expected state based on vehicle motion. If the transmission output does not properly reduce or stop when the vehicle is stationary, the system detects this abnormality and takes corrective action, ensuring reliable safety control.
Solution Approach 2:
The system performs preliminary determination of the vehicle's stop state before adjusting the transmission output. By detecting whether the vehicle has come to a stop and anticipating the need to reduce transmission, the system proactively adjusts the output to prevent harmful radiation before it can occur, rather than reacting after an incident.
3Adaptability or versatility
If the transmission output is reduced at vehicle stop to comply with regulatory limits, then regulatory compliance is improved, but the complexity of control mechanisms increases
Solution Approach 1:
The determining means serves multiple functions: it detects the vehicle's travel state, controls the transmission output adjustment, and monitors for abnormalities in the transmission control function. By making this single component multi-functional, the invention achieves regulatory compliance without proportionally increasing overall system complexity.
Solution Approach 2:
The invention merges the transmission output control function with the abnormality determination function into an integrated system. The same determining means that controls transmission based on vehicle state also monitors whether the transmission is properly adjusted, combining multiple control and monitoring functions into a unified mechanism to minimize complexity.
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
Effectively stops or reduces transmission output during vehicle stops, ensuring safety and compliance with regulatory limits by confirming the output state and preventing accidental detection or irradiation, thereby enhancing safety and operational reliability.
Implementation Method 1
transmitting means for transmitting an electromagnetic wave
Implementation Method 2
receiving means for receiving the electromagnetic wave reflected by a target object of the transmission electromagnetic wave
Data Source
AI summary
Provided is a radar device includes a transmitting unit, a receiving unit for receiving the electromagnetic wave reflected by a target object of the transmission electromagnetic wave, a target object measuring unit for measuring at least a distance between the radar device and the target object on the basis of the transmission and reception electromagnetic waves, a transmission output control unit (S1, S2) for stopping or reducing a transmission output of the transmitting unit under a predetermined condition, a transmission output control function abnormality determining unit (S3 to S6) for determining that the transmission output control unit is abnormal upon receiving the reception electromagnetic wave having an intensity exceeding a predetermined threshold value even at the time of one of stop and reduction of the transmission output, and an abnormality determination time processing unit (S7) for stopping a power supply of the radar device when an abnormality is determined.