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Technical Paper

Enhanced Injector Dead Time Compensation by Current Feedback

2016-04-05
2016-01-0088
The constant motivation for lower fuel consumption and emission levels has always been in the minds of most auto makers. Therefore, it is important to have precise control of the fuel being delivered into the engine. Gasoline Port fuel injection has been a matured system for many years and cars sold in emerging markets still favor such system due to its less system complexity and cost. This paper will explain injection control strategy of today during development, and especially the injector dead-time compensation strategy in detail and how further improvements could still be made. The injector current profile behavior will be discussed, and with the use of minimum hardware electronics, this paper will show the way for a new compensation strategy to be adopted.
Technical Paper

Routing methods considering security and real-time of vehicle gateway system

2020-04-14
2020-01-1294
Recently, vehicle networks have increased complexity due to the demand for autonomous driving or connected devices and require high bandwidth. And vehicle manufacturers have begun applying Ethernet protocols, a new network that can replace existing vehicle network protocols. However, it is difficult to replace the entire CAN protocols with Ethernet protocols completely due to safety and reliability issues. Therefore, the vehicle manufacturer introduced a vehicle gateway system. The system uses Ethernet for the external network and the CAN network for communication between internal controllers. The vehicle gateway system provides an interface for constantly connecting and exchanging vehicle data in a heterogeneous communication environment between the existing CAN network protocol and the external Ethernet protocol. Therefore, it is necessary to design the minimum delay time considering the real time.
Technical Paper

The Low Level Driver Design to Improve Dwell Timing of Engine Management System

2015-04-14
2015-01-1621
In Engine Management System, more accurate control is required to improve engine performance. Especially generating the precise ignition signal has a direct effect on better engine performance. In the beginning of this paper, a basic software structure to synchronize the engine crank signal and generate ignition signals will be explained. Several cases which can generate dwell timing error will be introduced based on this software structure. In addition, each impact level for each error case will be described. For cases of major error, compensation ways will be proposed in order to obtain more accurate dwell timing. The compensation ways by both microcontroller hardware and user software will be explained in detail. In conclusion, this paper will show the accuracy of ignition signal which implements proposed compensation ways that can be improved as compared to conventional ignition signal.
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