• Transactions of the Korean Society of Automotive Engineers
• /
• v.22 no.1
• /
• pp.71-76
• /
• 2014

This Research focuses on how to maximize fuel economy improvement of I.S.G. while keeping 12V system. With 12V system the maximum gain of fuel economy with I.S.G. is known to be about 3~5% in FTP-75 mode because engine stop is only conducted in standstill idle. But in this study deceleration engine stop (engine speed is zero) has been tried additionally and the optimum condition for deceleration engine stop was found to maximize fuel economy improvement in practical point of view, the result of which is about 8.8% in FTP-75.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.9 no.7
• /
• pp.1601-1606
• /
• 2005

In this study, an automatic idle stop control system was developed, which automatically stops the idle state engine as it detects the stop state of the car for several seconds and restarts the stopped engine with the driver's electrical signal. It is composed of microprocessor and the related electronic circuits and communicates with ECU and TCU. With accurate and confirmed operating performance, the control system was equipped in the test car which was proceeded the ECE15+EUDC mode test. It is confirmed that the control system, ASG has much favourable effects on reducing the fuel consumption and harmful exhaust emissions.

• Journal of Korean Society of Transportation
• /
• v.32 no.5
• /
• pp.421-430
• /
• 2014

The greenhouse gas emission generated by idling vehicles is a critical issue in the greenhouse gas reduction from the transportation sector. Recently, the mandatory application of the Idle Stop and Go (ISG) for buses, trucks and taxis is in the process of legislation. Focusing on the regulation is about to apply to passenger cars, this study analyzed the quantitative economic effects of the ISG installation by passenger car types in Seoul metropolitan area to support proper policy making. The benefit cost ratio of ISG installation on commercial passenger car of Seoul is the most effective, calculated as 8.55. Accordingly, the amount of 660 liters (per year per vehicle) of fuel and 1,606 kg (per year per vehicle) of $CO_2$ could be reduced. The results of this study might be used as an index for judgment of policy such as determining appropriate subsidy for ISG installation on passenger cars.

• Proceedings of the KIPE Conference
• /
• 2013.07a
• /
• pp.61-62
• /
• 2013

최근 EV(Electric Vehicle), PHEV(Plug-in Hybrid Electric Vehicle), HEV(Hybrid Electric Vehicle) 등 친환경 차량의 개발 및 출시가 진행되고 있고 이들 친환경 차량의 궁극적 목적은 엔진과 배터리 혹은 배터리 단독 사용에 의한 고연비, 배기가스 배출 저감 등을 목적으로 하고 있다. 하지만 기존 내연기관 차량과 비교시 차량가격이 높게 형성되어 시장 활성화는 다소 시간이 소요될 것으로 판단된다. 이러한 친환경 차량 기술은 신차에만 국한되어 적용되고 있고 현재 도로상에서 운행중인 대부분의 차량은 기존의 저연비, 다량의 배기가스 배출문제를 여전히 내포하고 있는 실정이다. 이에 대한 대안으로 기존의 차량 보조배터리에 지능형 배터리 센서(IBS, Intelligent Battery Sensor)를 장착하고 이를 통해 ISG(Idle Stop&Go)을 수행하는 Mild HEV 형태의 차량이 개발되고 있다.

• Journal of the Korean Applied Science and Technology
• /
• v.33 no.1
• /
• pp.83-91
• /
• 2016

We studied the effect of battery deep cycle according to the way of active materials formation and the creation condition of electrode material, 3BS ($3PbO{\cdot}PbSO_4{\cdot}H_2O$) and 4BS ($4PbO{\cdot}PbSO_4$), in order to develop the batteries for Idle Stop & Go system. During the curing with active materials of anode and cathode, we found that the final creased active material was deformed by temperature control and it effects the durability of batteries. AGM battery and Flooded battery with 3BS active materials have excellent initial performance. And AGM battery with 4BS active materials shows the lower performance relatively. To compare and analyze of the formation efficiency of active materials, we tested the formation chagging steps with 3 steps and 9 steps differently. The results are that AGM battery with 4BS active materials is better on initial performance than AGM battery with 3BS. After the comparison of durability by DOD 17.5% life test, AGM battery is more suitable than flooded battery for the ISG system which needs the frequent deep cycle. In conclusion, AGM battery is the most suitable for ISG system and the life performance shows 80% difference according to the way of formation and curing of AGM batteries.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.11
• /
• pp.6830-6837
• /
• 2014

Since the advent of global warming and energy depletion, there has been great interest in eco-driving (energy-efficient driving). In this paper, a system is proposed to monitor the idle running of an engine and steady driving for a vehicle equipped with an ISG (Idling Stop & Go system). The system consists of a G/W device to acquire the vehicle operation data, a smartphone app for monitoring eco-driving and a server system. The main contribution of this paper is that it defines the integrated functions, the architecture and operation mechanisms of a system for monitoring eco-driving including the prohibition of running idle. The system enables the users to check the idling stop times, driving speeds, fuel savings, and $CO_2$ emissions, resulting in the driving style for eco-driving. The server system, which is a part of this system, provides OpenAPI-style web services for the storage and retrieval of car operation data, which facilitates the development of applications.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.21 no.4
• /
• pp.120-127
• /
• 2013

Hybrid electric vehicles have applied electric parts for saving fuel consumption and reducing levels of environmental pollution. Electrification of automobiles is indispensable for entering into global market because of enhanced environment restriction. ISG (Integrated Starter & Generator) system is one of main electric parts and can improve fuel efficiency more than other components by using Idle Stop & Go function and regenerative braking system. However, if ISG motor and inverter work under the continuously high load condition, it will make them the decrease of performance and durability. So the ISG motor and inverter need to properly design the cooling system of them. In this study, we suggested the enhancement points by modifying the thermal design of ISG motor and then confirmed the improvement of the cooling performance.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.806-807
• /
• 2015

Integrated Starter-Generator(ISG)는 스타터(Starter)와 발전기(Generator)를 하나의 장치로 통합한 형태의 자동차 부품 시스템이다. ISG는 높은 토크로 엔진을 돌려주어 차량의 원활한 Idle Stop & Go 가능하게 하고 차량 제동 시에는 발전기 역할을 하여 배터리를 충전한다. 본 논문에서는 ISG용 WFSM (Wound Field Synchronous Motor)의 초기모델에 반응표면법을 적용하여 계자 유기 전압 및 토크 리플 저감을 목표로 최적화 설계를 진행하였다.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.21 no.1
• /
• pp.19-26
• /
• 2016

In this study, a bidirectional DC-DC converter for idle stop and go (ISG) is developed to reduce fuel consumption. A three-phase non-isolated half-bridge converter is selected through a design method by considering efficiency and volume. According to the state of charge of the batteries at both the low-voltage and high-voltage sides, buck mode, which charges a low-voltage battery from the generated motor energy, and boost mode, which provides power to the motor from the low- and high-voltage battery sides, are required in the ISG system. Hence, an autonomous and seamless bidirectional control method using a variable current limiter is proposed for mode change. A 1.8 kW engineering sample of the proposed converter has been built and tested to verify the validity of the proposed concept. The maximum efficiencies, including gate driver and control circuit losses, are 96.4% in charging mode and 96.1% in discharging mode.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.22 no.1
• /
• pp.59-64
• /
• 2014

Integrated Starter Generator (ISG) system improves the fuel economy of hybrid electric vehicles by using idle stop and go function, and regenerative braking system. To obtain the high performance and durability of ISG motor under continuously high load condition, the motor needs to properly design the cooling system (cooling fan and cooling structure). In this study, we suggested the enhanced design by modifying the thermal design of the ISG motor and then analyzed the improvement of the cooling performance under high-speed condition and generating mode by CFD simulation. The temperatures at the coil and the magnet of the enhanced model were decreased by about $4^{\circ}C$ and $6^{\circ}C$, respectively, compared to those of the conventional model. Therefore, we verified the cooling performance enhancement of the novel thermal design in the case of core loss increment due to the higher speed condition.