Object Detection Device Current Control Unit Noise Resistance
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Solution Overview
Problem
In object detection devices, increasing electrostatic capacitance to improve resistance to electrical noise results in prolonged charging times, leading to communication disruptions between the ECU and sensors due to excessive current exceeding communicable limits during capacitor charging.
Innovation Solution
An object detection device configures a current control unit to manage current flow after powering the driver circuit, allowing for the use of larger capacitors by controlling the current through a communication line, thereby shortening the time until communication is resumed and enhancing noise resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrostatic capacitance of the capacitor is increased to improve resistance to electrical noise, then the resistance to electrical noise is improved, but the charging time of the capacitor is prolonged
Solution Approach 1:
The capacitor is charged to a predetermined voltage level before the driver circuit is activated. This preliminary charging action ensures that the capacitor has sufficient charge capacity to handle electrical noise interference, while the charging is performed in advance during periods when communication current limits are not restrictive.
Solution Approach 2:
The system employs periodic control where the capacitor is charged during specific time periods when communication is not required, and then used to suppress electrical noise during driver circuit operation. This periodic charging approach allows the use of larger capacitors without continuously restricting communication.
2Reliability
If the electrostatic capacitance of the capacitor is increased to improve resistance to electrical noise, then the resistance to electrical noise is improved, but communication disruption time is prolonged due to current exceeding communicable limits
Solution Approach 1:
The capacitor is pre-charged to the required voltage level before the driver circuit is activated. This preliminary action ensures that the capacitor can immediately provide noise suppression capability without causing prolonged communication disruption, as the charging is performed in advance when communication constraints are less critical.
Solution Approach 2:
The control unit acts as an intermediary that manages the charging process of the capacitor, coordinating between the power supply, the capacitor, and the communication system. It ensures that charging current is controlled to not exceed communicable limits while still achieving sufficient charge capacity for noise resistance.
3Reliability
If a larger capacitor is used to improve noise resistance, then the resistance to electrical noise is improved, but the time required to charge the capacitor increases
Solution Approach 1:
Larger capacitors are charged in advance to predetermined voltage levels before the driver circuit operates. This preliminary charging allows the system to utilize the full noise suppression capability of larger capacitors without experiencing prolonged charging delays during critical operational periods.
Solution Approach 2:
The system dynamically adjusts the charging strategy based on operational requirements. During periods when noise suppression is not immediately needed, larger capacitors are charged at optimal rates. When the driver circuit is activated, the pre-charged capacitors immediately provide the required noise resistance without delay.
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 configuration enables prompt resumption of communication between the ECU and sensors, allows for the use of larger capacitors with longer charging times, and improves resistance to electrical noise.
Implementation Method 1
drive a piezoelectric vibrator in a predetermined control period to transmit a survey wave, and receive a wave reflected by an object
Implementation Method 2
a capacitor connected in parallel with a driver circuit configured to drive the piezoelectric vibrator
Data Source
AI summary
An object detection device is applied to an object detection system configured such that connection to a control device is made via a communication line to perform power supply via the communication line and a signal is superimposed on current flowing through the communication line to transfer information. The object detection device is configured to drive a piezoelectric vibrator in a predetermined control period and transmit a survey wave and receive a wave reflected by an object. The object detection device includes a capacitor connected in parallel with a driver circuit configured to drive the piezoelectric vibrator, and a current control unit configured to control the current value of the communication line after the end of supplying power to the driver circuit.