Vehicle Failsafe Device Emergency Oil Supply Unit
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Solution Overview
Problem
Existing vehicles lack a reliable failsafe mechanism to maintain hydraulic pressure in the transmission when both the electric oil pump and oil pump controller fail, preventing the vehicle from driving safely to a repair location.
Innovation Solution
A failsafe device and control method that omits the mechanical oil pump, using an emergency oil supply unit integrated with the transmission to produce hydraulic pressure via a second oil channel, with dual controllers to switch between normal and emergency oil supply modes, ensuring the vehicle can drive in a limp home mode even when the electric oil pump fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical oil pump is installed to provide failsafe hydraulic pressure, then the vehicle can drive in limp home mode when the electric oil pump fails, but the vehicle weight increases and fuel efficiency decreases
Solution Approach 1:
The invention extracts and removes the mechanical oil pump from the system, eliminating the source of weight and fuel consumption while maintaining the failsafe function through alternative means (electric pump with reservoir and control mechanisms)
Solution Approach 2:
The electric oil pump is designed to perform multiple functions: normal operation during regular driving and emergency operation during failsafe conditions, eliminating the need for a separate mechanical pump dedicated solely to failsafe operations
2Reliability
If a mechanical oil pump is installed to provide failsafe hydraulic pressure, then the vehicle can drive in limp home mode when the electric oil pump fails, but the device complexity increases
Solution Approach 1:
The invention merges the failsafe function into the existing electric oil pump system by integrating a reservoir, control valve, and pressure sensor with the pump, eliminating the need for a separate mechanical pump and its associated mounting, wiring, and control systems
3Weight of moving object
If only an electric oil pump is used to reduce weight and improve fuel ratio, then the vehicle structure is simplified, but the vehicle cannot drive safely when the electric oil pump and oil pump controller fail
Solution Approach 1:
The invention implements beforehand cushioning by providing an oil reservoir that stores hydraulic fluid in advance, along with control mechanisms that can redirect this stored oil to maintain pressure when the pump fails, enabling limp home mode operation
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 the vehicle to drive safely in a limp home mode by maintaining hydraulic pressure, reducing vehicle weight and improving fuel efficiency by eliminating the mechanical oil pump, while providing a stronger failsafe function to prevent accidents due to oil supply system failures.
Implementation Method 1
an emergency oil supply unit that supplies oil to the transmission via a second oil channel and produces the hydraulic pressure
Data Source
AI summary
A failsafe device for a vehicle is provided that includes a transmission of a vehicle and a controller configured to operate an oil supply unit and an emergency oil supply unit. The oil supply unit supplies oil to the transmission via a first oil channel and produces hydraulic pressure and the emergency oil supply unit supplies oil to the transmission via a second oil channel and produces the hydraulic pressure when an oil supply system fails.