Excessive Power Consuming Circuit for EV Regenerative Energy Management
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Solution Overview
Problem
In electric powered vehicles, abrupt changes in power balance during harsh braking or skidding can lead to overcharging of the power storage device due to excessive regenerative power generation, necessitating a control structure to manage and consume this excess energy efficiently to prevent overcharge.
Innovation Solution
A power supply system with a controller that activates an excessive power consuming circuit to manage excess regenerative power, determining when the power is acceptable for the storage device by monitoring voltage, current, and elapsed time, and using sensors to calculate the regenerative power and adjust the operation of the circuit accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the excessive power consuming circuit is continuously operated to prevent overcharge, then the power storage device is protected from overcharge, but power loss increases due to consuming more power than the original excess power
Solution Approach 1:
The controller continuously monitors the regenerative power level and uses this feedback to dynamically control the excessive power consuming circuit. When regenerative power exceeds the power storage device's capacity, the circuit is activated; when it falls within acceptable limits, the circuit is deactivated. This feedback mechanism ensures the circuit operates only when necessary, preventing both overcharge and unnecessary power loss.
Solution Approach 2:
The system transitions from a static, continuous operation mode to a dynamic, condition-based operation mode. The excessive power consuming circuit's operational state is continuously adjusted based on real-time power conditions, allowing the system to adapt its power consumption behavior to match actual excess power levels, thereby minimizing energy loss while maintaining protection.
2Reliability
If the excessive power consuming circuit is activated to consume excess regenerative power, then overcharge is prevented, but determining the appropriate activation timing requires complex control logic
Solution Approach 1:
The controller uses real-time feedback from power sensors to automatically determine when to activate or deactivate the excessive power consuming circuit. By continuously monitoring regenerative power levels and comparing them against the power storage device's capacity, the system simplifies the control logic to a straightforward conditional response: activate when power exceeds capacity, deactivate when it does not.
Solution Approach 2:
The control system monitors its own operational conditions and automatically makes decisions about circuit activation without requiring external intervention or complex predetermined logic. The controller assesses the current power state and self-determines the appropriate action, reducing the need for elaborate control structures while ensuring reliable overcharge protection.
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
The system effectively prevents overcharge of the power storage device by consuming excess regenerative power, minimizing power loss and ensuring the power storage device operates within safe charging limits.
Implementation Method 1
an excessive power consuming circuit for consuming, when driven on, excess power not charged to the storage device of the regenerative power
Data Source
AI summary
If it is determined that excess power is generated based on overcharge information of a power storage device, a controller starts an operation of consuming the excess power by an excessive power consuming circuit. The controller counts elapsed time from the time point when the power consuming operation started, and if the counted elapsed time exceeds a minimum on-time set in advance, switches the excessive power consuming circuit from active to inactive state. The minimum on-time is set based on a pattern that is expected to cause generation of excessive regenerative power from an AC electric motor because of abrupt change in running status of an electric powered vehicle mounting a motor drive system.