Cellular Phone Dual Transceiver Passive Entry Control
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Solution Overview
Problem
Existing mobile phones lack efficient mechanisms for directly and securely controlling safety device functions of motor vehicles, such as passive entry systems, due to limitations in communication protocols and energy efficiency.
Innovation Solution
Incorporating a second transceiver unit with LF and HF modules in mobile phones, allowing direct switching to active mode upon receiving specific radio signals, enabling the transmission of authorization codes for safety device control via UHF interfaces, and using low-frequency signals for extended range and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional connection protocols are used for mobile phone to control safety devices, then connection stability is improved, but response time increases significantly (taking several seconds)
Solution Approach 1:
The system divides communication into two separate channels: a first transceiver unit for reliable connection establishment via mobile radio network, and a second transceiver unit for rapid authorization code transmission via short-range radio. This segmentation allows each channel to be optimized for its specific function, resolving the contradiction between stable connection and fast response.
Solution Approach 2:
The mobile phone预先 establishes a reliable connection through the first transceiver unit before needing to control the safety device. When a control command is needed, the already-established connection enables immediate transmission through the second transceiver unit without negotiation delays, achieving both stability and speed.
2Loss of information
If high-frequency signals are used for transceiver communication, then information transmission capability is improved, but energy consumption increases
Solution Approach 1:
The system applies different frequency characteristics to different communication needs: the first transceiver unit uses conventional mobile radio frequencies for reliable connection setup, while the second transceiver unit uses optimized radio frequencies specifically tuned for low-energy, short-range authorization code transmission. This local optimization of frequency properties resolves the energy-capability contradiction.
3Device complexity
If passive entry system is implemented without direct action capability, then device simplicity is maintained, but control efficiency decreases
Solution Approach 1:
The mobile phone is enhanced with a second transceiver unit that enables it to perform multiple functions: maintaining reliable network connection via the first transceiver unit, and simultaneously providing direct, immediate control capability for passive entry systems through the second transceiver unit. This multi-functionality allows the phone to act as both a communication device and a direct control key, improving efficiency without significantly increasing 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
Enables fast, secure, and energy-efficient remote control of safety device functions, including central locking and immobilizers, by bypassing conventional connection protocols and utilizing low-frequency signals for longer range and reduced energy consumption.
Implementation Method 1
a second transceiver unit, as a result of which a first radio signal can be received. The mobile radio telephone is able to be switched to an active mode when the first radio signal is received
Implementation Method 2
a second radio signal with an authorization code for controlling the function of the safety device is transmitted by the second transceiver unit
Implementation Method 3
A connection to the cellular network for mobile communication or a mobile data connection via the cellular network can be set up via a UHF interface (ultra high frequency interface)
Data Source
Figure 1~3
Figure 4
AI summary
The invention relates to a cellular phone (10) for remotely controlling at least one function of a security device (12) of a motor vehicle (11). The cellular phone (10) has a first transceiver unit (14), whereby a connection can be established to a cellular network (16). According to the invention, the cellular phone (10) has a second transceiver unit (18), by means of which a first radio signal (20) can be received. The cellular phone (10) can be switched into an active mode by means of the received first radio signal (20), and a second radio signal (22) with an authorization code (21) can be transmitted by means of the second transceiver unit (18) in the switched active mode in order to control the function of the security device (12).