Electrical Control Unit Short-Circuit Timing Compensation
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Solution Overview
Problem
In fuel injection control systems, a short-circuit in the circuit elements connecting the ground and boosted voltage paths can delay the start of fuel injection due to the output voltage becoming similar to ground voltage, leading to a delayed valve opening and incomplete fuel injection within a predetermined period.
Innovation Solution
An electrical control unit with a constant voltage supply, a boosted voltage supply, and a control unit that includes a booster circuit, a switching element, a capacitor, and interrupters to detect and manage short-circuits, advancing the power supply start timing when a short-circuit is detected to prevent delays in fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a short-circuit occurs in the circuit element connecting ground and boosted voltage path, then the output voltage becomes substantially the same as ground voltage, but the fuel injection start timing is delayed
Solution Approach 1:
The control unit detects a short-circuit condition in advance through voltage monitoring and proactively compensates by advancing the power supply start timing. This preliminary detection and compensation mechanism prevents the timing delay from occurring in the first place, ensuring that fuel injection starts at the correct time even when a short-circuit is present in the boosted voltage path.
2Reliability
If the capacitor is short-circuited, then the boosted voltage cannot be maintained, but the fuel injection timing is delayed
Solution Approach 1:
The control unit continuously monitors the voltage level at the capacitor and detects when it is short-circuited. Based on this feedback information, the control unit adjusts the power supply start timing to occur earlier than normal. This feedback mechanism allows the system to adapt to the short-circuit condition and maintain correct fuel injection timing despite the capacitor being unable to hold boosted voltage.
3Reliability
If the switching element is short-circuited, then the voltage output to electromagnetic valve is reduced, but the valve opening is delayed
Solution Approach 1:
The control unit detects the short-circuit condition in the switching element through voltage monitoring and proactively compensates by advancing the power supply start timing. This preliminary compensation ensures that the electromagnetic valve receives sufficient voltage to open at the correct time, even though the switching element is short-circuited and cannot provide full boosted voltage.
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 control unit ensures timely fuel injection by interrupting electric current in short-circuited paths, maintaining higher voltage output and reducing the delay in fuel injection start timing, even when short-circuits occur, thereby preventing incomplete fuel injection.
Implementation Method 1
a capacitor (i) disposed in a third current path that leads from a junction of the first current path and the second current path and leads to the reference voltage and (ii) charged by a counter electromotive force that is generated in the coil due to the turning ON and OFF of the switching element
Data Source
AI summary
An electrical control unit includes a constant voltage supply unit which supplies a constant voltage to a fuel injector, a boosted voltage supply unit which supplies a boosted voltage to the fuel injector, a control unit which controls supply timings of the constant voltage supply unit and the boosted voltage supply unit, and an interrupter which interrupts electric current when a short-circuit occurs in the boosted voltage supply unit. When an interruption of the interrupter is not detected, the boosted voltage supply unit supplies boosted voltage to start a fuel injection and the constant voltage supply unit supplies constant voltage to continue the fuel injection. When an interruption of the interrupter is detected, the constant voltage supply unit and the boosted voltage supply unit advance an interrupted power supply start timing relative to a non-interrupted power supply start timing to prevent delay of a fuel injection start timing.