Design Of Hardware And Software For GDI Engine’s Electronic Control Unit Based On TC1782

The gasoline direct injection(GDI) engines can achieve great benefits in thetorque and power output and the huge potential to reduce the emission and fuelconsumption, have became the next mainstream models of the gasoline enginesfor a period of time. Engine electronic control technology as a key technology incylinder direct injection gasoline engine, will be one of the key research. Aimed at aGDI engine with the double VVT, ETC, turbocharger technology, etc., thehardware and the underlying driver software and its calibration systemsoftware of the engine electronic control unit(ECU) for experiments wasdeveloped, so that the ECU can real-time detect engine sensor signal, andrealize the control of various actuators. The main study contents are as follows:(1) The hardware design of the ECU. By analyzing functional requirements ofthe GDI engine ECU used in the bench test, the configuration of the sensorsand actuators were determined, and the overall scheme design of the GDIengine ECU was proposed. According to different signal characteristics of thesensors and the driving principle of the actuators, the ECU hardware system wasdesigned based on the Infineon32-bit MCU TC1782with Tricore kernel, thesignal conditioning of the sensors and the hardware driving of fuel injectors,ignition coil, intake and exhaust VVT phase regulator, high pressure oil pumpactuator and so on, were achieved. The hardware debugging results show that, theECU hardware circuits with good reliability and anti-interference ability meet thedesign requirements.(2) Software design of the ECU driving layer. The general structure of theECU software was formulated, and the software system tasks were defined andthe task priorities were assigned based on task scheduling mechanism andinterrupt handling mode. The underlying drivers programs of the ECU softwaresystems were developed, mainly including acquisition, analysis and physicalquantity conversion of various sensors input signals, injection timing control,ignition timing control, throttle valve position control, adjusting of the inlet andexhaust VVT phase regulating valve, fuel rail pressure control, CCP protocol analysis,and so on, which lay the foundation for implementation of application layer controlstrategy and control algorithm. The software debugging results shows that, the software can accurately calculate actual physical values according to thecorresponding sensor signals, and can accurately calculate the control signal ofthe actuator, such as injectors, ignition coil, etc, so the design the requirements ofcan be met basically.(3) Software development of the ECU calibration system. The calibrationsystem software with the man-machine dialogue interface was developed basedon Visual Basic development environment. Through the CAN bus communication,the control parameters for the engine operation can be set online, and the stateparameters during the engine running can be monitored in real-time, and thefunctions to upload, modify, save and download the MAP data can also berealized. The debugging results shows that, the calibration software has moreflexibility and versatility, and is able to satisfy the requirements of the ECUcalibration and monitoring task.By debugging combined the hardware system with the software system, to acertain extent, the feasibility and reliability of the hardware and software of theECU for experiment are verified, and the test tool for studying the combustionprocess and performance of GDI gasoline engine is provided.