Research and development field

Exhaust heat recovery device (EHRS)

  • Heat recovery devices are used for automobiles and are used for improving fuel efficiency
  • When the engine engine is started, the engine maintains a high RPM condition until it rises to a certain temperature Also, soot remains high. This These actions are called warm up and contribute to the reduction of fuel efficiency.
  • Exhaust heat recovery device’s principle is to shorten the engine warm-up time by raise the cooling water’s temperature using the heat exhaust gas by heat exchanger when Engine starts.
  • Using the Exhaust heat recovery device system, one can expect to improve the fuel efficiency of cars as well as reducing gas consumption.


  • Electronic control Exhaust valve that reduces noise from low output by flowing the exhaust gases inside the muffler and improves the power of the engine at high output by detecting the output of the engine and varying the exhaust gas flow with fusion of electronic / mechanical parts


  • The EGR is a system that recirculates some exhaust gases into the engine combustion chamber without emitting exhaust fumes completely to reduce Nox, PM in automobile exhaust gas
  • The recirculated exhaust gas contains a large volume of CO ₂ compared to N2, which results in a lower temperature increase when burning the same amount of fuel.
  • Also Exhaust gas with low oxygen content is flowed into the combustion chamber, which lowers the maximum temperature, and amount of Nox markedly decrease.
  • Parts requires high precision control which use Engine Recirculation System

Exhaust valve.

  • The exhaust valve for the vehicle is assembled within the muffler silencer. The main function is to reduce exhaust gas emissions and to improve fuel efficiency and engine power.

Ni-Ti (shape memory alloy)

  • Shape memory alloy is an alloy that remembers its original shape and that when deformed returns to its pre-deformed shape when heated .
  • Ni-Ti (Nitinol) is the most representative material of shape memory alloys. It is made of Ni and Ti.
  • The shape memory alloy has a shape recovery temperature that allows it to return to its original shape. Based on this temperature, the alloy changes and returns to its original shape before deformation.
  • Ni-Ti is a shape memory alloy with high affinity for human body and is widely used for medical applications such as stents, implants and orthodontic appliances.
  • Recently, the application range has been expanded not only for medical use but also for various industrial fields.

Ni-Ti 형상기억합금

High-temperature bearing

  • The bearings applied to general passive variable valves are made of thinned wire, knitted into a mold, and then used as a bearing by pressure molding.
  • In this way, the thermal endurance temperature of a bearing using a wire is usually about 450 ° C. So Application in environments requiring high heat-resistant temperature is impossible.
  • A hollow space is formed in the interior of a bearing formed by press-forming a wire mesh knitted wire, depending on the filling rate of the wire and The oxidation of the wire proceeds rapidly in a high temperature oxidizing atmosphere
  • To develop bearings satisfying thermal durability at high temperatures , we fill the empty space inside the existing bearing with grappipe so that the wire is not exposed to high temperature oxidative atmosphere


High temperature heat resistant spring

  • It has been applied to various fields by developing special materials that can be used at high temperatures.
  • Typically, WASPALOY, INCONEL718 and KW60 were developed.
  • torsion springs have been manufactured and applied to automobile mufflers.

고온 내열용 스프링