Automotive Smart Key Housing Grounding Against Electrostatic Noise
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Solution Overview
Problem
The existing smart key system for automobiles experiences performance deterioration due to electrostatic charging of the resin case and resin panel, which increases the strength of noise signals and further enhances electrostatic charging, ultimately impairing vehicle performance.
Innovation Solution
The smart key system includes an on-vehicle device with a transmitter, receiver, control unit, and resin case, where electrostatic charging is removed from either or both of the resin case and resin panel by connecting them to the ground or using an electrostatic-charging removing surfactant layer on the exterior surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the strength of the radio signal transmitted from the on-vehicle device is increased, then the communication reliability with the electronic key is improved, but the resin case and resin panel are electrostatically charged more severely, leading to increased noise signals and performance deterioration
Solution Approach 1:
The patent applies electrostatic charging removal sheets that convert the harmful electrostatic charging effect into a manageable condition by providing a path for charge dissipation. The sheets are positioned to receive charges from the resin case and resin panel, transforming the problematic electrostatic accumulation into a controlled discharge process that prevents performance deterioration while allowing strong radio signal transmission
2Power
If the strength of the radio signal transmitted from the on-vehicle device is increased, then the transmission power is improved, but the electrostatic charging of the resin case and resin panel increases, causing vehicle performance deterioration
Solution Approach 1:
The patent introduces electrostatic charging removal sheets as intermediary elements between the resin case/resin panel and the vehicle body. These sheets act as mediators that provide a controlled path for electrostatic charge dissipation, allowing high transmission power operation without compromising vehicle performance by preventing charge accumulation on critical components
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 effectively prevents or reduces the deterioration of vehicle performance by eliminating electrostatic charging from the resin case and resin panel, thereby maintaining normal traveling performance.
Implementation Method 1
a transmitter configured to transmit a search signal to the electronic key
Implementation Method 2
a receiver configured to receive a response signal transmitted from the electronic key in response to the search signal
Implementation Method 3
electrostatic charging generated by the search signal transmitted from the transmitter is removed from either or both of the resin case and the resin panel
Implementation Method 4
at least one of the resin case and the resin panel, and the body of the automobile electrically connected to a negative electrode of an auxiliary battery may be connected to a ground
Data Source
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AI summary
A key system for an automobile according to the present disclosure includes an on-vehicle device (1) configured to transmit and receive a radio signal to and from an electronic key (2), and a resin panel (3) through which the on-vehicle device (1) is fixed to and held by a body of the automobile. The on-vehicle device (1) includes a transmitter (11) configured to transmit a search signal to the electronic key (2), a receiver (12) configured to receive a response signal transmitted from the electronic key (2) in response to the search signal, a control unit (14) configured to control the transmission of the search signal, and a resin case (15). The smart key system for the automobile according to the present disclosure removes electrostatic charging generated by the search signal transmitted from the transmitter (11) in either or both of the resin case (15) and the resin panel (3).