Piezoelectric Fuel Injection Trigger Circuit Continuous Fault Monitoring
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Solution Overview
Problem
Existing electric circuits for fuel injection systems in motor vehicles require time to check for faults before charging or discharging piezoelectric elements, which reduces the accuracy of injecting small fuel amounts.
Innovation Solution
The electric circuit connects two transistors and a second measuring shunt in series, allowing current to flow through both measuring shunts during charging or discharging, enabling continuous monitoring and eliminating the need for a pre-check, with a control unit detecting faults by summing currents through these shunts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fault check is performed prior to charging or discharging operation, then the reliability of the piezoelectric element is improved, but the time available for charging or discharging is reduced, worsening the injection accuracy for small fuel amounts
Solution Approach 1:
The patent implements continuous fault monitoring during the entire charging or discharging operation by connecting the measuring shunt in series with the transistors. This allows the control unit to detect faults in real-time without interrupting or delaying the piezoelectric element operation, thereby maintaining both reliability and time efficiency
Solution Approach 2:
The measuring shunt continuously monitors the current flowing through the piezoelectric element during normal operation, allowing the system to self-diagnose faults without requiring separate check operations. The monitoring is integrated into the operational workflow itself
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 solution enhances the reliability of the electric circuit during fuel injection, ensuring accurate injection of small fuel amounts without time penalties for fault checking, and allows for continuous monitoring without disrupting the charging or discharging process.
Implementation Method 1
a plurality of series circuits having a piezoelectric element and a transistor are connected in parallel
Implementation Method 2
A first measuring shunt is grounded in series with the parallel circuit
Data Source
AI summary
An electric circuit for triggering a piezoelectric element, a fuel injection system of a motor vehicle in particular, is described. A first measuring shunt connected in series to the piezoelectric element is provided. Provided are two transistors connected in series whose shared connecting point is connected to the piezoelectric element. A second measuring shunt is also provided. The two transistors and the second measuring shunt are connected in series.