Vehicle Power Supply Fail-Safe Controller Switch Malfunction
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Solution Overview
Problem
The existing vehicle power supply apparatus faces difficulties in controlling the generator motor when a switch is rendered inoperative in an OFF state, leading to inappropriate functioning.
Innovation Solution
The vehicle power supply apparatus includes a first and second power supply system, switches, and a fail-safe controller, which allows for appropriate control of the generator motor by coupling and isolating the systems and inhibiting the powering state of the motor generator in case of a malfunctioning switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second switch is controlled to the second turn-off state to isolate the generator motor and the second electrical energy accumulator, then the generator motor can be protected from inappropriate discharge, but the generator motor cannot be properly controlled when the switch malfunctions
Solution Approach 1:
The fail-safe controller performs preliminary detection of the second switch state before controlling the generator motor to the powering state. By checking whether the second switch is in the second turn-off state beforehand, the controller prevents inappropriate powering state activation when the switch is malfunctioning, thus maintaining reliability while avoiding unnecessary restrictions on normal operation
Solution Approach 2:
The fail-safe controller continuously monitors the state of the second switch and provides feedback to determine whether to allow generator motor powering. This feedback mechanism ensures that the generator motor is only controlled to the powering state when the switch is functioning properly, resolving the contradiction between switch reliability and motor controllability
2Power
If the generator motor is controlled to the powering state to provide power, then the power supply capability is improved, but the state of charge of the second electrical energy accumulator degrades
Solution Approach 1:
The fail-safe controller checks the switch state before allowing the generator motor to enter the powering state. This preliminary verification ensures that power extraction from the second electrical energy accumulator only occurs when the switch is functioning correctly, preventing unauthorized or inappropriate discharge that would degrade battery state of charge
Solution Approach 2:
The fail-safe controller acts as an intermediary between the second switch and the generator motor control system. It mediates the control signal by verifying switch functionality before permitting powering state activation, thus controlling both power supply capability and battery state of charge protection
Data Source
AI summary
A vehicle power supply apparatus includes first and second power supply systems, first and second switches, and a fail-safe controller. The second power supply system includes a generator motor coupled to an engine, and a second electrical energy accumulator able to be coupled to the generator motor. The fail-safe controller inhibits a powering state of the motor generator on the condition that the second switch is in a malfunctioning state in which the second switch is rendered inoperative in a second turn-off state. The second turn-off state includes isolating the generator motor and the second electrical energy accumulator from each other.