Key fob

Abstract

The present application belongs to the technical field of vehicle control, and particularly relates to a kind of remote keys, remote key includes control unit, signal transmitting unit and signal detection unit, signal transmitting unit receives the instruction of control unit and sends radio frequency signal, signal detection unit collects radio frequency signal, control unit analyzes the radio frequency signal collected by signal detection unit and feeds back analysis result;Control unit identifies the radio frequency signal collected by signal detection unit, and sends signal normal prompt, when control unit cannot identify the radio frequency signal collected by signal detection unit, signal abnormal prompt is sent.User can observe the signal emission condition of remote key in real time after operating control remote key, knows whether remote key sends effective control signal, thereby judges the working state of remote key, and improves the reliability of remote key control vehicle.

Description

Technical Field

[0001] This invention belongs to the field of vehicle control technology, and specifically relates to a remote control key. Background Technology

[0002] Car remote keys enable remote locking and unlocking of vehicles. To ensure reliability, reliability testing is required during the development phase, and the signal transmission circuit needs to be tested during production to guarantee the reliability of the remote key's control function. With the widespread adoption of remote keys, instances of remote key malfunctions during daily use have gradually increased. Users often cannot determine whether the problem lies with the remote key failing to send a valid signal or with the vehicle's unlocking system failing to respond, necessitating the sending of the vehicle and key for inspection and troubleshooting. This inefficient troubleshooting process severely impacts the user experience. Summary of the Invention

[0003] The purpose of this invention is to provide a remote control key that can display the working status of the remote control key to the user, which helps the user troubleshoot remote control failures.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a remote control key, comprising a control unit, a signal transmitting unit, and a signal detection unit. After the signal transmitting unit receives the instruction from the control unit and transmits a radio frequency signal, the signal detection unit collects the radio frequency signal. The control unit analyzes the radio frequency signal collected by the signal detection unit and feeds back the analysis results. After the control unit recognizes the radio frequency signal collected by the signal detection unit, it issues a signal normal prompt. When the control unit cannot recognize the radio frequency signal collected by the signal detection unit, it issues a signal abnormality prompt.

[0005] Compared with the prior art, the present invention has the following technical effects: After operating the remote key, the user can observe its signal transmission status in real time at the remote key, know whether the remote key has issued a valid control signal, thereby judging the working status of the remote key and improving the reliability of remote key vehicle control. Attached Figure Description

[0006] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings in the drawings:

[0007] Figure 1 This is a schematic diagram of the present invention. Detailed Implementation

[0008] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0009] A remote control key includes a control unit 10, a signal transmitting unit 20, and a signal detection unit 30. After the signal transmitting unit 20 receives the instruction from the control unit 10 and sends out a radio frequency signal, the signal detection unit 30 collects the radio frequency signal. The control unit 10 analyzes the radio frequency signal collected by the signal detection unit 30 and feeds back the analysis results.

[0010] After the control unit 10 recognizes the radio frequency signal collected by the signal detection unit 30, it issues a signal normal indication. If the control unit 10 cannot recognize the radio frequency signal collected by the signal detection unit 30, it issues a signal abnormality indication. The signal indication can use indicator lights or graphic symbols to indicate the working status of the remote control key.

[0011] In a preferred embodiment, the signal detection unit 30 collects the frequency and output power of the radio frequency signal to allow the user to initially determine abnormal conditions such as insufficient battery power or no radio frequency signal output of the remote control key. The control unit 10 determines whether the frequency of the radio frequency signal collected by the signal detection unit 30 matches a preset frequency range. If the frequency of the radio frequency signal collected by the signal detection unit 30 matches the preset frequency range, a normal signal frequency indication is issued, and an indicator light is illuminated. If the frequency of the radio frequency signal collected by the signal detection unit 30 does not match the preset frequency range, a signal frequency abnormality indication is issued, and the indicator light is not illuminated. In other embodiments, a red indicator light can also be set as a frequency abnormality indicator light; when a signal frequency abnormality is detected, the red indicator light is illuminated. The control unit 10 determines whether the output power of the radio frequency signal collected by the signal detection unit 30 matches a preset output power range. If the output power of the radio frequency signal acquired by the signal detection unit 30 matches the preset output power range, a normal signal output power prompt will be issued, and an antenna graphic symbol will be displayed on the display screen on the remote control key. If the output power of the radio frequency signal acquired by the signal detection unit 30 does not match the preset output power range, an abnormal signal output power prompt will be issued, and an antenna abnormality graphic symbol will be displayed on the display screen on the remote control key, or the antenna graphic symbol may not be displayed. Of course, the frequency of the radio frequency signal acquired by the signal detection unit 30 can also be displayed on the display screen to show its working status.

[0012] Specifically, after receiving a user command, the control unit 10 sends a command to drive the signal transmitting unit 20 to start the radio frequency circuit and generate a radio frequency carrier. Simultaneously, it sends a command to drive the encryption chip to generate a key. The key is modulated onto the radio frequency carrier and transmitted outward via the transmitting antenna. The radio frequency signal collected by the receiving antenna of the signal detection unit 30 is first filtered, then sent to the radio frequency amplifier circuit for amplification, and then demodulated and filtered by the detection circuit and converted into a DC voltage. The control unit 10 compares this DC voltage with a preset voltage. When the DC voltage output by the signal detection unit 30 matches the preset voltage, it determines that the signal frequency and output power are normal; when the DC voltage output by the signal detection unit 30 does not match the preset voltage, it determines that the signal frequency is normal but the output power is abnormal; when the signal detection unit 30 fails to output a DC voltage, it determines that the signal frequency is abnormal.

[0013] Furthermore, in this embodiment, the DC voltage output by the signal detection unit 30 is electrically connected to the indicator light. A higher DC voltage results in a brighter indicator light, while a lower DC voltage results in a dimmer indicator light. The DC voltage output by the signal detection unit 30 is converted by the circuit and then electrically connected to the display screen. The display screen displays corresponding graphic symbols based on the magnitude of the DC voltage to distinguish the strength of the detected radio frequency signal.

[0014] The signal detection unit 30 is located at the end of the circuit where the signal transmitting unit 20 is located, and the signal detection unit 30 shares a power supply with the signal transmitting unit 20. This allows for monitoring the entire signal link of the remote key from the button to the antenna output. The indicator light will only illuminate when the battery and button are normal, the chip circuit is normal, the RF circuit is normal, the key modulation state is normal, the RF circuit's transmission frequency and power are normal, and the antenna's electromagnetic radiation is normal. Otherwise, the key indicator light will not illuminate, thus warning of a potential key malfunction. In this embodiment, the signal transmitting unit 20 includes a transmitting antenna, and the signal detection unit 30 includes a receiving antenna, which is a microstrip antenna or a high-frequency wire-wound inductor. To ensure the acquisition of RF signals, the receiving antenna and the transmitting antenna are arranged parallel and spaced apart to avoid interference between adjacent antennas. The receiving antenna can be located on one side of the transmitting antenna, or several groups can be arranged at intervals around the transmitting antenna to ensure that the RF signal strength acquired by the receiving antenna meets the requirements.

[0015] In this embodiment, when the user presses the lock or unlock button on the remote key panel, the remote key's control chip activates the signal transmission unit 20. The signal transmission unit 20 generates an radio frequency (RF) carrier. Simultaneously, the control chip identifies the command corresponding to the operation button, generates a key, and loads the key onto the RF carrier. The RF carrier loaded with the key is transmitted outward via the transmitting antenna as radio waves. At this time, the signal detection unit 30 collects the RF signal and first sends the collected signal to a filter to remove noise. Then, the filtered RF signal is sent to the RF amplifier circuit for amplification and conversion into DC voltage. Under stable operating conditions of the RF signal detection unit and the key's transmission, the magnitude of the DC voltage converted by the detection circuit is related to the RF output power of the key. If the remote key's RF circuit has no power output, or the key data is not modulated by the carrier, or the antenna circuit is detuned, causing the radio waves to not radiate effectively, the RF signal detection unit will have no DC voltage output, resulting in the indicator light not illuminating or an alarm sounding.

Claims

1. A remote control key, characterized in that: The remote control key includes a control unit (10), a signal transmitting unit (20), and a signal detection unit (30). After the signal transmitting unit (20) receives the instruction from the control unit (10) and sends out a radio frequency signal, the signal detection unit (30) collects the radio frequency signal. The control unit (10) analyzes the radio frequency signal collected by the signal detection unit (30) and feeds back the analysis results. After the control unit (10) recognizes the radio frequency signal collected by the signal detection unit (30), it issues a signal normal prompt. When the control unit (10) cannot recognize the radio frequency signal collected by the signal detection unit (30), it issues a signal abnormal prompt. The signal detection unit (30) is located at the end of the circuit where the signal transmitting unit (20) is located, and the signal detection unit (30) and the signal transmitting unit (20) share the same power supply; The signal detection unit (30) acquires the frequency and output power of the radio frequency signal. The control unit (10) determines whether the frequency of the radio frequency signal collected by the signal detection unit (30) matches the preset frequency range. If yes, it issues a signal frequency normal prompt; otherwise, it issues a signal frequency abnormal prompt or does not issue a prompt. The control unit (10) determines whether the output power of the radio frequency signal acquired by the signal detection unit (30) matches the preset output power range. If yes, it issues a normal signal output power prompt; otherwise, it issues an abnormal signal output power prompt or does not issue a prompt. The signal transmitting unit (20) includes a transmitting antenna, and the signal detection unit (30) includes a receiving antenna. The receiving antenna is a microstrip antenna or a high-frequency wire-wound inductor. The receiving antenna and the transmitting antenna are arranged in parallel and spaced apart. After receiving the user's instruction, the control unit (10) issues an instruction to drive the signal transmitting unit (20) to start the radio frequency circuit and generate a radio frequency carrier. At the same time, it issues an instruction to drive the encryption chip to generate a key. The key is modulated and loaded onto the radio frequency carrier and transmitted outward via the transmitting antenna. The radio frequency signal collected by the receiving antenna of the signal detection unit (30) is first filtered by a filter, then sent to the radio frequency amplifier circuit for amplification, and then demodulated and filtered by the detection circuit and converted into DC voltage. The control unit (10) compares the DC voltage with the preset voltage. When the DC voltage output by the signal detection unit (30) matches the preset voltage, it determines that the signal frequency is normal and the output power is normal. When the DC voltage output by the signal detection unit (30) does not match the preset voltage, it determines that the signal frequency is normal and the output power is abnormal. When the signal detection unit (30) fails to output DC voltage, it determines that the signal frequency is abnormal.

2. The remote control key according to claim 1, characterized in that: The receiving antennas are arranged in several groups around the transmitting antennas at intervals.

3. The remote control key according to claim 1, characterized in that: The DC voltage output by the signal detection unit (30) is electrically connected to the indicator light. A higher DC voltage results in a brighter indicator light, while a lower DC voltage results in a dimmer indicator light. Alternatively, the DC voltage output by the signal detection unit (30) is converted by the circuit and then electrically connected to the display screen. The display screen displays the corresponding graphic symbol according to the magnitude of the DC voltage to distinguish the strength of the detected radio frequency signal.

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