Investigation of Waste Heat Recovery Systems for a Series Hybrid Electric Vehicle with a Lean Burn SI Engine (Second Report)

Masaki Naruke･Takaaki Kitamura (JARI)

Recovering the waste heat is important to improve fuel efficiency of a hybrid electric vehicle. In this study, waste heat recovery (WHR) systems with phase change cooling (PCC) concept were applied to a series hybrid electric vehicle with a lean burn SI engine that can be operated at an excess air ratio of 2.0. The effects of combining WHR and PCC systems on fuel economy were evaluated by using one-dimensional numerical simulation.

Improved Mechanical Properties and Conversion Efficiency of Thermoelectric Power Generator for Automobile

Michihiro Ohta･Kishor Kumar Johari (AIST)･Masaki Naruke (JARI)･Yoshinori Tsuchiya (The Research association of Automotive Internal Combustion Engines)･Kazuki Imasato･Sauerschnig Philipp･Takao Ishida･Atsushi Yamamoto (AIST)

In this work, the thermoelectric device have been developed for waste heat (~200 degrees Celsius) recovery generated from automobile. The Mg3(Sb,Bi)2-based thermoelectric materials was used in our device, because their mechanical strength is better than that of the conventional Bi2Te3-based thermoelectric materials. The thermoelectric figure of merit of Mg3(Sb,Bi)2 at 200 degrees Celsius was successfully improved by tuning the chemical composition ratio of Sb and Bi.

Development of a Compact Rankine Cycle Generator with an Integrated-Component Structure (Fifth Report: Reconsideration of Pump and Waste Heat Recovery Section)

Katsuyuki Tanaka･Takashi Izumida･Nana Tonooka･Hiroki Kato･Chigusa Nakagawa･Tetsuhiro Wakiyama･Kenya Ohtsuka (Nihon University)

We reported the compact Rankine cycle generator with an integrated-component structure as the first report at this conference last year. After this structure was reconsidered, we found better to change the position of the pump and to separate the section of waste heat recovery. We will report the progress of the developments.

Study of Optimal Thermal Management System for Battery Based on Vehicle System 1D Simulation Model

Yuya Hato･Toshio Hirota･Yushi Kamiya (Waseda University)･Kiyotaka Sato (Mazda)

When using the electric power of the lithium-ion battery in the electric vehicle, it is necessary to take measures against battery voltage drop and degradation. To accomplish this, the system needs to be designed to manage the battery temperature appropriately and efficiently. We studied more efficient optimal thermal management system for mass-produced electric vehicle, which is used in charging and driving situation using the vehicle system 1D simulation model.

A Study on the Diagnostic Logic of Insufficient Coolant using Coolant Temperature Sensor

Suho Lee (Hyundai Motor)

In order to control the integrated flow control valve using the variable separation cooling technology, a total of three coolant temperature sensors are applied at the inlet of the engine, the outlet of the engine, and the location of the block, but there is no way for the driver to know about poor coolant filling or the leak of the coolant.
we developed a new logic to diagnose the lack of coolant by using three coolant temperature sensors that are already being applied without a separate increase in cost. If the flow rate decreases when the coolant is insufficient, The principle of increasing the coolant temperature difference was used. the principle evaluation was also conducted simultaneously on the metal surface temperature and fuel efficiency effect of the head/block.