Honda Giken Kogyo Kabushiki Kaisha

Other

Nobuo Arai

Naoyuki Enjoji

Hiroyuki Goto

Katsunori Nakamura

Shigeru Aoki

Kazuki Ishikawa

Kazuhiro Ueda

Yoshio Saito

Yoji Nakajima

Shigeo Hidai

Atsushi Kato

Toshiyuki Nishida

Akira Murakami

Eisaku Gosho

Hiroyuki Iwasaki

Ryuichi Noseyama

Kenichiro Ishibashi

Yoshikazu Ohshima

Shuichi Togasawa

A gas pressure-reducing valve in which a valve member to be seated on a valve seat having a valve hole opened at its central portion and leading to a pressure-reducing chamber between a body and a diaphragm is fixed on a valve stem connected to the central portion of the diaphragm and arranged coaxially with the valve axis. A bottomed mounting bore which is aligned with the valve axis and opened toward the pressure-reducing chamber is formed in the body. A cylindrical valve seat member forming a valve chamber between itself and the closed end of the mounting bore for accommodating the valve member and inserted into the mounting bore is fixed on the body. A valve seat facing the valve chamber is formed on the inner surface of the end portion of the valve seat member on the side of the pressure-reducing chamber. This arrangement makes it possible to reduce the number of parts and to enhance the degree of freedom for the arrangement of the parts in the body.

Gas pressure-reducing valve

A regulator for compressed natural gas is prevented from being frozen and from being heated to higher than a degree appropriate for prevention of the freezing. A hot-water passage 11 for circulating a portion of the engine cooling water is provided adjacent to a gas passage 24 equipped with a reducing valve 21 in the primary decompression section A of the regulator. A hot-water outlet member 10 is provided at the outlet aperture of the hot-water passage 11. A temperature sensitive valve 42 is mounted in the hot-water outlet member 10 and is set so that the hot-water passage 11 is closed with the valve body 48 when the temperature of the hot-water exceeds the degree appropriate for prevention of the freeze at the outlet aperture.

Regulator for gas fuel engine

Supply of fuel is stopped when fuel pressure sensed by a pressure sensor provided upstream of a regulator is at a predetermined value or less to avoid abnormal combustion caused by improper adjustment of air/fuel ratio. Even slight variation of the fuel pressure is sensed by monitoring the fuel pressure in an interval after closing a fuel shut-off valve once opened to re-opening of it. In addition, an abnormal state in the fuel system is detected by comparing an accumulated value of amount of injected fuel and an estimated value of fuel consumption in the tank. Furthermore, the peak current value of the fuel injection valve is controlled so that, when the engine at a low temperature is started, lift load of the injection valve is larger than sticking force of the injection valve, thereby preventing such situation where the injection valve is frozen so that it cannot supply fuel to the engine. In this case, the engine can be smoothly started by simultaneously controlling the valve open time. Furthermore, the temperature of the regulator is properly maintained so that optimum function can be exhibited by controlling the flow rate of cooling water flowing through a water passage provided in the regulator for regulating the fuel gas pressure.

Gas fuel supply system for vehicle

Growing community of inventors

Wako, Japan

Nobuo Arai