Injection Control Device Charge Noise Management
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Solution Overview
Problem
The existing injection control devices for internal combustion engines face challenges with charge noise generation during boosting control, leading to deteriorated current monitoring accuracy, which affects injection amount and fuel consumption, and prohibiting boosting control temporarily reduces charge possible time, while high-speed booster circuits increase costs and circuit size.
Innovation Solution
An injection control device with a charge control setting unit that selectively permits or prohibits charging of the booster circuit based on injection type, allowing charge prohibition during valve-closing detection learning to improve accuracy and permitting charging for other injections to secure chargeable time, thus avoiding the need for high-speed circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If boosting control is performed continuously, then charge possible time is sufficient, but charge noise is generated and current monitoring accuracy deteriorates
Solution Approach 1:
The patent applies dynamics by making the boosting control state changeable based on operational conditions. The boosting control unit switches between performing boosting control and not performing it, depending on whether valve-closing detection learning is being executed. This dynamic adjustment resolves the contradiction by adapting the charging behavior to the current operational phase, ensuring high current monitoring accuracy during learning while maintaining sufficient charge time during normal operation.
Solution Approach 2:
The patent changes the parameter of boosting control execution status based on the injection type. When valve-closing detection learning is required, the system changes the boosting control parameter to 'not perform', thereby eliminating charge noise during critical measurement periods. This parameter change approach allows the system to maintain both sufficient charge time and high measurement precision under different operating conditions.
2Measurement precision
If boosting control is prohibited for a certain time, then valve-closing detection learning accuracy is improved, but charge possible time is reduced
Solution Approach 1:
The patent applies preliminary action by determining in advance whether valve-closing detection learning is required and setting the appropriate boosting control state before operation begins. The charge control setting unit pre-configures whether boosting control should be performed based on the injection type, ensuring that charge noise is prevented during learning operations while maintaining sufficient charge time during normal fuel injection operations.
Solution Approach 2:
The system dynamically adjusts the boosting control execution based on the detected injection type. When valve-closing detection learning is required, the system switches to a state where boosting control is not performed, thereby improving measurement precision. When normal operation occurs, the system switches back to performing boosting control, ensuring sufficient charge possible time. This dynamic adaptation resolves the time-precision contradiction.
3Loss of time
If high-speed booster circuit is used, then charge possible time is ensured, but circuit size and cost increase
Solution Approach 1:
The patent extracts the charge noise generation mechanism from the boosting control function by separating the timing of boosting control execution from continuous operation. Instead of requiring a high-speed circuit to handle simultaneous charging and monitoring, the system extracts the charging function to specific time periods when monitoring is not critical, thereby reducing circuit speed requirements and overall system complexity.
Solution Approach 2:
The patent applies periodic action by implementing boosting control in periodic intervals rather than continuously. The boosting control unit performs charging operations during periods when valve-closing detection learning is not required, and suspends charging during learning periods. This periodic operation pattern ensures sufficient charge possible time while using a standard-speed circuit, avoiding the need for expensive high-speed booster circuits.
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 enhances injection accuracy by learning valve-closing detection time and ensuring sufficient charge possible time without increasing circuit size or cost, while preventing charge noise and maintaining current monitoring accuracy.
Implementation Method 1
a booster circuit for boosting a battery voltage to be a reference power supply voltage of a power supply circuit and a boosting control unit for boosting and controlling the booster circuit
Data Source
AI summary
An injection control device opens and closes a fuel injection valve by driving the fuel injection valve with a current to control fuel injection to an internal combustion engine. The injection control device includes: a booster circuit that boosts a battery voltage; a boosting control unit that performs boosting control on the booster circuit; and a charge control setting unit that sets charge permission or charge prohibition for the booster circuit to the boosting control unit.