Vehicle Power Supply Switch Control for Accumulator Protection
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Solution Overview
Problem
Existing vehicle power supply apparatuses face the challenge of preventing excessive discharge of accumulators when executing motor assistance control, as they often isolate one accumulator from the electric motor, which can lead to uncontrolled discharge.
Innovation Solution
The vehicle power supply apparatus includes a switch controller and an assistance controller that manage the coupling and isolation of two accumulators with an electric motor, ensuring the switch is closed only when necessary to prevent excessive discharge by monitoring the charge and discharge states of the accumulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the switch is closed to couple the first power supply system and the second power supply system during motor assistance control, then the electric motor can receive power from both accumulators to provide assistance to the engine, but the first electrical energy accumulator may discharge excessively without proper monitoring
Solution Approach 1:
The switch controller closes the switch in advance when motor assistance control is about to be executed, ensuring the first power supply system is ready to provide power. This preliminary action prevents excessive discharge by establishing proper coupling before the motor draws power, rather than allowing uncontrolled discharge to occur first.
Solution Approach 2:
The assistance controller monitors the charge and discharge states of the first electrical energy accumulator and provides feedback to the switch controller. When the charge state becomes ungraspable or excessive discharge is detected, the controller inhibits motor assistance control and opens the switch, creating a feedback loop that prevents reliability issues while enabling power output when conditions are safe.
2Reliability
If the switch is opened to isolate the first power supply system from the second power supply system, then the first electrical energy accumulator is protected from excessive discharge, but the electric motor cannot receive additional power from the first accumulator for motor assistance control
Solution Approach 1:
The switch dynamically changes its state based on real-time monitoring of the first electrical energy accumulator's charge state. The switch closes when the accumulator is in a safe state to enable motor assistance, and opens when the charge state becomes ungraspable or excessive discharge is detected. This dynamic switching optimizes both protection and power availability rather than maintaining a fixed state.
Solution Approach 2:
The control system automatically monitors the charge state of the first electrical energy accumulator and self-regulates the switch state without external intervention. When the accumulator reaches unsafe discharge levels, the system automatically opens the switch to isolate the first power supply system, and can automatically reclose when conditions improve, enabling the system to protect itself while maintaining power availability when safe.
3Reliability
If the switch controller continuously monitors the charge state of the first electrical energy accumulator to prevent excessive discharge, then the reliability of the power supply system is improved, but the complexity of the control system increases
Solution Approach 1:
The switch controller performs multiple functions: it controls the coupling between power supply systems, monitors the charge state of the first electrical energy accumulator, determines when motor assistance control should be executed, and opens the switch when excessive discharge is detected. By consolidating these multiple functions into a single controller, the system achieves reliable charge state monitoring without proportionally increasing overall system complexity.
Solution Approach 2:
The control functions for switch management, charge state monitoring, and motor assistance control are merged into an integrated control system. The switch controller and assistance controller work as a unified system where the switch controller handles both switching operations and charge state determination, reducing the need for separate dedicated components and simplifying the overall control architecture while maintaining comprehensive monitoring capabilities.
Data Source
AI summary
A vehicle power supply apparatus includes a first power supply system, a second power supply system, a switch, a switch controller, and an assistance controller. The first power supply system includes a first electrical energy accumulator and an electric device coupled thereto. The second power supply system includes an electric motor coupled to an engine, and a second electrical energy accumulator able to be coupled to the electric motor. The switch controller controls the switch to an electrically conductive state on the condition that a motor assistance control is about to be executed. The assistance controller inhibits the motor assistance control on the condition that a charge state and a discharge state of the first electrical energy accumulator become ungraspable.