Signal Sensitivity Control for RKE and PASE Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration of external antennas and low noise amplifier (LNA) circuits in remote keyless entry (RKE) systems interferes with passive entry and starting (PASE) systems, rendering the PASE system non-functional and requiring manual vehicle entry or reducing RKE performance.
Innovation Solution
A method to control the signal sensitivity of the receiver module by temporarily shutting off the external antenna or LNA circuit during PASE activation, reducing interference and allowing simultaneous operation of both RKE and PASE systems without performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If an external antenna is used to increase the operating range of the RKE system, then the RKE system performance is improved, but the PASE system becomes non-functional due to increased noise and signal interference
Solution Approach 1:
The patent applies dynamics by making the antenna system configurable between different states. The receiver module can dynamically switch between using the external antenna for RKE operations and using an internal antenna for PASE operations, allowing both systems to function properly by adapting the antenna configuration to the specific mode of operation.
Solution Approach 2:
The patent segments the antenna functionality by providing separate external and internal antenna paths that can be independently controlled. The receiver module can selectively activate either the external antenna or the internal antenna based on whether RKE or PASE mode is active, thereby resolving the interference problem while maintaining both system types.
2Length of moving object
If an LNA circuit is used to amplify the incoming signal for large operating range, then the RKE system performance is improved, but the PASE system is rendered non-functional due to amplified noise interference
Solution Approach 1:
The LNA circuit is made dynamic by enabling selective activation. The receiver module can turn the LNA on during RKE operations to amplify weak signals from distant transmitters, and turn the LNA off during PASE operations to prevent noise amplification that would interfere with the passive authentication process.
Solution Approach 2:
The signal processing path is segmented into separate processing chains for RKE and PASE modes. The LNA is placed in the RKE signal path where it provides necessary amplification, while the PASE signal path can bypass the LNA or have it disabled, preventing noise interference with the sensitive passive authentication signals.
3Reliability
If the external antenna is unplugged to eliminate interference with the PASE system, then the PASE system functions properly, but the RKE system performance is severely diminished
Solution Approach 1:
Instead of permanently removing the external antenna, the system dynamically configures which antenna to use based on the active mode. During PASE operations, the system switches to the internal antenna to eliminate interference, while during RKE operations, the external antenna is activated to restore long-range functionality. This dynamic switching allows both systems to operate at full capability.
Data Source
AI summary
A method of controlling the signal sensitivity of a receiver module of a remote signal communication system includes initializing a PASE function and actuating a switch from a first position to a second position. The second position represents an open switch wherein either an external antenna or a LNA circuit or both are shut off. The switch is returned to a first position in response to completion of a PASE command.