Fuel Injection Booster Circuit Control for Longer ECU Life
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Solution Overview
Problem
Existing in-vehicle electronic control devices face increased load on booster circuits due to continuous multi-stage fuel injection, leading to reduced device life and increased energy consumption, particularly when injection intervals fluctuate independently of engine speed.
Innovation Solution
The system includes a booster circuit with a boost setting controller that adjusts boost current based on engine temperature and injection commands, reducing boost current when not needed for rapid voltage increase, thus minimizing load on the booster circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the boost current of the booster circuit is increased to provide sufficient energy for multi-stage fuel injection, then the fuel injection can be performed in multiple stages, but the load on the booster circuit increases and device life is reduced
Solution Approach 1:
The patent applies dynamics by making the boost control current variable rather than fixed. The boost setting controller dynamically adjusts the boost control current based on real-time engine temperature and injection stage information, increasing current only when needed for rapid voltage boosting and reducing it during normal operation, thereby extending booster circuit life while maintaining multi-stage injection capability
Solution Approach 2:
The patent changes the parameter of boost control current based on engine temperature conditions. When engine temperature is below the threshold value, the boost control current is set to a first value for rapid voltage increase; when engine temperature is above the threshold, it is set to a second value to reduce load. This parameter adaptation resolves the contradiction between injection performance and circuit life
2Productivity
If the boost control current is increased to ensure sufficient energy supply for each injection stage, then the fuel injection can be performed continuously, but heat generation in the booster circuit increases and component life is reduced
Solution Approach 1:
The patent implements periodic action by controlling the booster circuit to operate at high current only during specific periods when energy accumulation is needed (cold engine conditions or between injection stages), and reducing current during normal operation. This periodic high-load operation reduces overall heat generation while maintaining continuous injection capability
Solution Approach 2:
The dynamic adjustment of boost control current based on engine temperature and injection stage information allows the system to optimize energy supply timing, providing high current only when necessary for voltage recovery and reducing it during steady-state operation, thereby controlling heat generation
3Manufacturing precision
If the boost control current is increased to reduce fuel injection variation, then the injection precision is improved, but the load on the booster circuit increases
Solution Approach 1:
The patent applies preliminary action by accumulating energy in the booster circuit before fuel injection events. The boost setting controller pre-charges the capacitor to the required voltage level when engine temperature is low, ensuring sufficient energy is available for precise injection without requiring continuously high power from the booster circuit during injection
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 extends the life of the electronic control device by reducing load on the booster circuit and electrolytic capacitors, particularly during low engine temperature or low-stage injections, thereby preventing deterioration.
Implementation Method 1
a booster circuit (1) that boosts battery voltage
Implementation Method 2
an electrolytic capacitor for smoothing a current of the booster circuit (1)... deterioration of the electrolytic capacitor
Data Source
AI summary
Provided is an electronic control device that drives and controls a fuel injection valve, the electronic control device increasing a boost current of a booster circuit only in a scene where boosting energy needs to be increased by short-time boosting, and reducing the boost current of the booster circuit in other scenes. The electronic control device including; a booster circuit; a boost setting controller that holds boost control information of the booster circuit; a boost controller that controls an energizing current of the booster circuit based on a current setting value from the boost setting controller; and a fuel injection circuit that supplies current to a fuel injection valve using voltage generated by the booster circuit, in which the boost setting controller reduces a boost speed of the booster circuit when information on engine temperature is higher than a predetermined value.