Vehicular Differential Power Control Circuit for Locked State Transition
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Solution Overview
Problem
Vehicular differentials remain in an unlocked state after the vehicle power is switched off, potentially causing accidents on sloped terrains due to wheel rotation, despite the parking brake being engaged.
Innovation Solution
A device comprising an input voltage pin, output voltage pin, input voltage regulation circuit, trigger circuit, driving circuit, and relay is used to detect the power switch and parking brake signals, generating a trigger signal to activate the relay and restore power to the differential speed controllers for a preset time, ensuring they transition to a locked state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the power switch is switched off to save energy, then power consumption is reduced, but the differential speed controller stops operation and the differential remains unlocked causing safety hazards
Solution Approach 1:
The trigger circuit detects the parking brake signal before power is completely cut off, and generates a trigger signal to activate the driving circuit. This preliminary action ensures the differential speed controller receives power extension signal to lock the differential before the power switch fully disconnects power, preventing the safety hazard of unlocked differential at parking state
Solution Approach 2:
The patent introduces intermediate circuits including trigger circuit, driving circuit, and relay as mediators between the power switch and the differential speed controller. When the parking brake is activated, these intermediate circuits detect the signal and control the relay to extend power supply to the differential speed controller, ensuring it transitions to locked state even after the main power switch is turned off
2Use of energy by moving object
If the differential speed controller stops operation immediately when power is switched off, then power consumption is reduced, but the differential remains in unlocked state allowing wheel rotation on sloped terrains
Solution Approach 1:
The trigger circuit generates a trigger signal upon detecting the parking brake signal, before the power switch completely cuts off power. This preliminary action activates the driving circuit and relay to extend power supply to the differential speed controller, ensuring it has sufficient time to lock the differential and prevent vehicle movement on sloped terrains
Solution Approach 2:
The patent implements a power extension mechanism that cushions the abrupt power cutoff by maintaining power supply to the differential speed controller for an additional period after the main power switch is turned off. This beforehand cushioning ensures the differential has adequate time to complete the locking transition, eliminating the harmful effect of unintended vehicle movement
Data Source
AI summary
A device for controlling power to a vehicular differential speed controller is applied to control a differential speed controller inside a vehicle, and has an input voltage regulation circuit, a trigger circuit, a driving circuit and a relay. The input voltage regulation circuit converts an input voltage into an operating voltage and supplies the operating voltage to the trigger circuit. The trigger circuit generates a trigger signal after receiving a parking brake signal, such that the driving circuit activates the relay according to the trigger signal and supplies an output voltage to the differential speed controller. Accordingly, the present invention can automatically provide a sufficient power supply time to the differential speed controller to switch an operation state of a vehicle differential to a locked state when the vehicle power is switched off and the parking brake is activated.