Browse Publications Technical Papers 2020-01-0581
2020-04-14

Development of Advanced Idle Stop-and-Go Control Utilizing V2I 2020-01-0581

Previous studies proposed the utilization of Advanced Driver Assistance System (ADAS) for introducing adaptiveness to powertrain control with respect to traffic situation change. When vehicle stops with the engine shut off by Auto Stop/Start function, the controller keeps watching the movement of preceding vehicle using ADAS sensors. Then it restarts the engine automatically as soon as it detects the launch of the vehicle ahead, before the driver releases brake pedal. The control logic also can inhibit Auto Stop/Start under specific driving conditions, for example, stopping for a stop sign or waiting at a roundabout by utilizing the traffic sign recognition function of vision sensor. In the prior studies it was demonstrated through actual vehicle tests that the new control method can improve the Auto Stop/Start performance, thereby mitigating customer complaints regarding the hesitation in engine restart and promoting the usage. However, the previously suggested method based on movement detection becomes useless if there was no target vehicle ahead to follow. The issue arises when the vehicle happens to be the first vehicle from traffic light waiting for green light. If the vehicle could obtain the signal phase and timing (SPaT) of the traffic light, the engine can be restarted automatically a couple of seconds before the traffic light turns green, without having to observe preceding vehicle’s movement. Various kinds of communication methods for connecting vehicle to other vehicles or traffic objects have been vigorously studied and developed as such connectivity became one of mainstream trends in automotive industry. As an example application of the technology to a conventional vehicle powertrain with ICE-only, this paper proposes a new ISG control logic utilizing traffic signal information via V2I network. Two different communication methods are investigated to obtain SPaT information: Dedicated Short Range Communication (DSRC) and 4G-LTE smart phone application. ISG logic is designed to restart engine prior to traffic light change, and its performance is validated through prototype vehicle testing. On-road test results under real-world traffic are provided with descriptions of control algorithm and prototype vehicle system configuration.

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