Daido Steel Co., Ltd.

Fuji Jukogyo Kabushiki Kaisha

Jatco Corporation

Hiroki Terada

Takahiro Miyazaki

Makoto Haritani

Yuuki Tanaka

Ayumi Yamazaki

Keiichiro Kamiya

Yasuo Ito

Kohei Yamaguchi

Junya Miyauchi

Ryohei Ishikura

Yusuke Yoshimi

Hiroaki Toyota

Shunsuke Ohshima

Kazumasa Uchida

A high surface-pressure resistant component includes a steel having a composition containing, in mass %, 0.17-0.23% of C, 0.80-1.00% of Si, 0.65-1.00% of Mn, 0.030% or less of P, 0.030% or less of S, 0.01-1.00% of Cu, 0.01-3.00% of Ni, and 0.80-1.00% of Cr, with the remainder being Fe and unavoidable impurities, in which the surface layer C concentration of a carburized and quenched layer is 0.70-0.80% in mass %.

High surface-pressure resistant component and production method therefor

The present invention relates to a part obtained from an age hardening type bainitic microalloyed steel, a process for producing the part, and the age hardening type bainitic microalloyed steel. In particular, the present invention relates to a part which has been controlled so as to have higher values of strength than conventional parts, a process for producing the part, and the age hardening type bainitic microalloyed steel.

Part obtained from age hardening type bainitic microalloyed steel, process for producing part, and age hardening type bainitic microalloyed steel

A failure diagnostic device for an exhaust gas recirculation (EGR) apparatus, which can detect an intake pipe pressure at a high accuracy with a simple control and can prevent false diagnosis of an EGR system. If at least either one of first and second off-mode intake pipe pressures P, Pexceeds a cancel determination value K, an ECU determines that the intake pipe pressures P, Pand Pare not properly detected, and cancels the failure diagnosis of the EGR system. Therefore, the false diagnosis of the EGR system can be avoided with a simplified process without requiring specific determinations on individual abnormal states of the various components other than the EGR system. By setting the cancel determination value K based on the intake pipe pressure P resulting when EGR off-control is executed in a state of an EGR valve being stuck in a fully-open position, each improperly-detected intake pipe pressure can be excluded with reliability.

Diagnostic device for exhaust gas recirculation system

Growing community of inventors

Tokyo, Japan

Hiroki Terada