Driveshaft Locking Pawl for Tamper-Resistant Vehicle Anti-Theft
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Solution Overview
Problem
Existing vehicle anti-theft systems are susceptible to tampering and bypassing, particularly those located within the vehicle cabin, allowing thieves to easily disable or break steering shaft locks, and current solutions do not effectively integrate with electronic alarm systems or prevent towing of vehicles.
Innovation Solution
An anti-theft device that includes a locking member mounted downstream of the power plant, an actuator, and an electronic control unit communicatively linked to receive signals about ignition and drivetrain motion, which locks the driveshaft or transmission when the ignition is off and the handbrake is engaged, and can be remotely controlled, with a tamper-proof casing and wireless communication module for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the locking mechanism is located within the vehicle cabin for easy access, then the ease of operation is improved, but the reliability is worsened due to susceptibility to tampering and breakage
Solution Approach 1:
The locking mechanism is extracted from the vehicle cabin and relocated to the drivetrain area, specifically engaging with the driveshaft or transmission. This removes the vulnerability to tampering while maintaining operational functionality through external actuation via the handbrake system.
Solution Approach 2:
The handbrake cable acts as an intermediary mechanism to transmit the locking action from the driver's input to the locking member. This indirect actuation method allows the locking function to be operated from within the cabin while the actual locking component remains protected in the drivetrain area.
2Reliability
If the locking mechanism is made robust to prevent tampering, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The anti-theft locking function is merged with the existing handbrake system. The locking member utilizes the handbrake cable's existing mechanical pathway and integration points, combining security functionality with an already-present vehicle system rather than adding a separate complex mechanism.
Solution Approach 2:
The handbrake system serves dual functions: its original braking function and the additional anti-theft locking function. This multi-functionality eliminates the need for a separate dedicated locking mechanism, reducing overall device complexity while maintaining reliability.
3Reliability
If the locking member is positioned to prevent driveshaft movement, then the effectiveness against theft is improved, but the ease of manufacture worsens due to integration requirements
Solution Approach 1:
The locking member is designed with dynamic positioning capability, allowing it to engage or disengage from the driveshaft based on handbrake cable tension. This dynamic mechanism uses the existing cable routing and tension variations to achieve locking without requiring complex fixed-position integration.
Solution Approach 2:
The locking mechanism utilizes the natural tension and positioning of the handbrake cable system to automatically engage the locking member in the correct position. The cable's existing mechanical properties serve the dual purpose of brake actuation and locking engagement, eliminating the need for additional positioning mechanisms.
4Reliability
If the system integrates with electronic control units and sensors, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The system incorporates sensors that detect the position of the locking member and the state of the handbrake, providing feedback to the electronic control unit. This feedback mechanism ensures the system only locks when appropriate conditions are met (handbrake engaged, ignition off), improving reliability without requiring complex control logic.
Solution Approach 2:
The electronic control system utilizes existing vehicle data (ignition state, handbrake position) to automatically control the locking mechanism. The system serves itself by making decisions based on readily available vehicle operational data, eliminating the need for separate control inputs or complex decision-making algorithms.
Data Source
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AI summary
An anti-theft device 10 is operatively connected to a vehicle drivetrain, downstream of a power plant. To this end, a gear 12 is mounted for rotation together with a driveshaft 13. The device 10 further includes a pivotally mounted locking pawl 17 which is movable relative to the gear 12 between an open position in which a profiled head 18 of the pawl 17 is spaced away from a periphery of the gear 12 such that the gear 12 is permitted to rotate freely together with the driveshaft 13, and a locked position, in which the profiled head 18 of the pawl 17 engages the gear 12 and prevents rotation thereof, thereby locking the driveshaft 13 in position. The device includes an actuator 23 and ECU 22 in a tamper-proof casing 27. The ECU controls engagement of the pawl depending upon a position of a handbrake and ignition switch.