H-Bridge Topology for Combined Solenoid and Piezo Injector Control
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Solution Overview
Problem
Current engine control units (ECUs) are often specific to particular engine types and injector configurations, limiting their flexibility and adaptability for use in both research and production environments, especially for advanced diesel engines.
Innovation Solution
The development of a flexible engine control module (ECM) and standalone direct injector driver module (SDIDM) that utilize a novel H-bridge topology for combined solenoid and Piezo injection control, allowing for multiplexing configurations and supporting various types of injectors, including unipolar and bipolar solenoid and Piezo injectors, through a field-programmable gate array (FPGA) and CPU-based control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated ECU is designed for a specific engine type and injector configuration, then control precision and reliability are improved, but adaptability and versatility deteriorate
Solution Approach 1:
The H-bridge circuit is designed to universally control multiple injector types (solenoid and piezo) through a single circuit topology. The circuit can operate in four different modes (unipolar solenoid, unipolar piezo, bipolar solenoid, bipolar piezo) by switching between different terminal connections, eliminating the need for dedicated ECUs for each injector type while maintaining reliable control through proven H-bridge architecture
2Manufacturing precision
If separate control circuits are used for solenoid and piezo injectors, then control precision is improved, but device complexity increases
Solution Approach 1:
The patent merges solenoid and piezo injector control into a single H-bridge circuit that can handle both injector types. The circuit combines multiple functions (unipolar/bipolar control, solenoid/piezo compatibility) into one integrated topology, reducing the number of separate circuits needed while maintaining precise control through mode-specific switching sequences
3Adaptability or versatility
If hardware adjustments are made for different injector configurations, then control adaptability is improved, but ease of operation deteriorates
Solution Approach 1:
The H-bridge circuit employs dynamic switching between different operational modes based on the injector type being controlled. The control system can dynamically reconfigure the circuit connections (A-B, A-C, B-C terminals) and switching sequences adapt to different injector configurations without requiring physical hardware changes, making the system both adaptable and easy to operate
Data Source
AI summary
An engine system may include a specified number of individual injectors, and an engine control unit (ECU) having a specified number of pins coupling to the individual injectors. The ECU may include a controller capable of dynamically switching between different multiplexing configurations, with each multiplexing configuration coupling individual injectors across corresponding pairs of pins. Each pin may internally couple to one half of an H-bridge structure, with an injector coupled across two pins thereby completing a full H-bridge structure, providing the flexibility to achieve combined solenoid and Piezo injection control. Specifically, each pin may be internally coupled to a low-side switch and a set of high-side switches, and the switches may be operated according to the dynamically selected multiplexing configuration and the type of injection control to perform any one or more of unipolar solenoid, unipolar Piezo, bipolar solenoid, and bipolar Piezo injection control, depending on the injector type used.