Pulse-Width Rectifier Emergency Generator Mode
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Solution Overview
Problem
Conventional pulse-width modulation rectifiers in hybrid vehicles fail to maintain energy supply and prevent overcharging when communication connections are disturbed, leading to rapid discharge of energy storage devices and potential vehicle shutdown.
Innovation Solution
The pulse-width rectifier automatically switches to an emergency generator operating mode, producing a prespecified power level to sustain essential electrical consumers and includes a separate control line for the control device to monitor and manage energy storage device states, preventing overcharging by deactivating the rectifier when excessive voltages or currents are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pulse-width rectifier switches to a safe state when communication connection is disturbed, then overcharging of the energy storage device is prevented, but electrical energy production stops completely causing rapid discharge and potential vehicle shutdown
Solution Approach 1:
The rectifier dynamically adapts its operating mode based on communication status. When communication is disturbed, it transitions from normal controlled operation to emergency generator mode, automatically adjusting its function to maintain essential energy supply while preventing overcharging through monitored control line signals.
Solution Approach 2:
The rectifier serves itself by autonomously detecting communication disturbances and switching to emergency mode without external intervention. It monitors its own operational state and independently maintains energy production at reduced levels while protecting the energy storage device from overcharging.
2Use of energy by moving object
If the pulse-width rectifier continues producing electrical energy during communication disturbances, then energy supply to consumers is maintained, but the energy storage device may become overcharged
Solution Approach 1:
The system implements feedback through a control line that provides real-time information about the state of the energy storage device to the rectifier. This feedback mechanism allows the rectifier to adjust its energy production dynamically, stopping or reducing generation when the energy storage device reaches adequate charge levels, thus preventing overcharging while maintaining supply during communication disturbances.
3Ease of operation
If a separate control line is added for emergency mode control, then precise control of energy production is achieved, but device complexity increases
Solution Approach 1:
The control system is segmented into distinct functional channels: the CAN bus for normal communication and a separate control line for emergency mode control. This segmentation allows independent operation of each control path, enabling precise control of energy production during disturbances without compromising the overall system architecture or requiring complete redesign of the control infrastructure.
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
Ensures continued vehicle operation by supplying essential electrical consumers with energy and preventing overcharging of the energy storage device, even during communication disturbances, allowing the driver to reach a service station safely.
Implementation Method 1
In the generator operating mode, the kinetic energy that is released during deceleration of the vehicle is converted into electrical energy (recuperation)
Implementation Method 2
Certain conventional pulse-width modulation rectifiers (PWR) standardly contain a power electronics stage as well as a computing core that is integrated into the PWR
Data Source
AI summary
A pulse-width rectifier for operating an electric machine in motor operating mode or in generator operating mode, includes a terminal for a control device that communicates with the pulse-width rectifier via a data connection. In order to safeguard the supply of energy in the case of a disturbance in the data transmission between the control device and the pulse-width rectifier, the pulse-width rectifier is constructed such that it automatically switches into an emergency generator operating mode in which it produces at its direct-voltage output a prespecified power with which it is possible to maintain at least an emergency operation of electrical consumers.