Vehicle Alternator Field Current Control for High Temperature Durability
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Solution Overview
Problem
Existing vehicle alternating current generators face challenges in maintaining durability in high temperature environments without altering mechanical design specifications, leading to decreased output power across various rotation and temperature ranges.
Innovation Solution
A power generation control device that intermittently controls the field current of a vehicle alternating current generator using a limit deactivation signal from an external control unit, deactivating the field current limit when the generator rotation speed is above a predetermined value and the temperature is lower, and keeping it activated otherwise, to manage output power effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical design specifications are changed to reduce heat generation, then durability in high temperature environment is improved, but output power decreases over the whole rotation speed range
Solution Approach 1:
The patent implements dynamic control of field current through a control device that adjusts the electricity supply continuity rate based on operating conditions (rotation speed, temperature, load). This allows the generator to operate at different field current levels dynamically, achieving high temperature durability when needed while maintaining full output power capability when conditions permit
Solution Approach 2:
The control device changes the parameter of field current (specifically the electricity supply continuity rate) based on detected operating conditions. By adjusting this electrical parameter dynamically, the system achieves temperature control without permanent mechanical modifications, thereby avoiding the output power reduction that would result from changing mechanical design specifications
2Temperature
If field current is restricted to reduce heat, then temperature is controlled, but output power decreases invariably over the whole range of use
Solution Approach 1:
The system dynamically adjusts field current restriction based on real-time detection of rotation speed, temperature, and electrical load conditions. The control device increases electricity supply continuity rate when rotation speed increases or electrical load increases, thereby maintaining output power when conditions permit while controlling temperature when necessary
Solution Approach 2:
The control device implements periodic or intermittent field current supply by controlling the electricity supply continuity rate. This allows the field current to be applied in controlled intervals, managing heat generation while maintaining the capability to deliver full power when operating conditions require it
3Use of energy by moving object
If electricity supply continuity rate is restricted during cruising, then regenerative energy is obtained during deceleration, but generator temperature rises abnormally when regenerative power generation is carried out frequently
Solution Approach 1:
The control device continuously detects generator temperature and uses this feedback to adjust the electricity supply continuity rate. When temperature rises abnormally due to frequent regenerative power generation, the control device restricts field current supply to allow cooling, preventing temperature damage while still enabling regenerative energy recovery when conditions are appropriate
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
This approach allows for increased durability in high temperature environments without depreciating generator characteristics, enabling the device to respond to regeneration and sudden electrical load increases without mechanical design changes, while restricting output power only where necessary for durability.
Implementation Method 1
a rotation speed detection unit that detects generator rotation speed
Implementation Method 2
a temperature detection unit that detects temperature of the power generation control device
Implementation Method 3
an electromagnet that generates a magnetic field in accordance with a magnetic field generation command
Data Source
AI summary
The invention enables durability in a higher temperature environment to be ensured without changing mechanical design specifications. A power generation control device for controlling generator output to a predetermined range by intermittently controlling a field current of a vehicle alternating current generator, includes a limit deactivation signal reception unit that receives a limit deactivation signal of the field current from an exterior, a rotation speed detection unit that detects generator rotation speed, a temperature detection unit that detects temperature of the power generation control device, and a limit activation/deactivation determination unit that, when the limit deactivation signal is input, deactivates the field current limit under predetermined rotation speed and temperature conditions.