Fuel injection system of internal combustion engine

Abstract

Abstract PURPOSE:To compensate decrease of an injection quantity due to a rise of fuel temperature, by detecting the fuel temperature in a fuel pipe and increasing a settig value of a pressure regulator when the fuel temperature is increased higher than a prescribed value. CONSTITUTION:A pressure difference between the first diaphragm chamber 421, introducing negative pressure in an intake pipe 6 or the atmosphere, and the second diaphragm chamber 422, introducing fuel in a fuel pipe 2, is adjusted to prescribed pressure by a pressure regulator 4, and the pressure regulator 4, switch 5, detecting fuel temperature in the pipe 2, and negative pressure selector valve 7, selectively introducing the negative pressure in the intake pipe or the atmosphere to the chamber 421, are provided. Then a system is constituted such that when fuel temperature is increased higher than a prescribed value, prescribed pressure of the pressure regulator is increased. If the fuel temperature exceeds the prescribed value, the switch 5 is opened, and conduction of an electric current in a solenoid 74 of the valve 7 is stopped to introduce the atmosphere to the chamber 421. Then the regulator 4 controls a pressure difference, between the atmosphere and fuel pressure, to a prescribed level, for instance, about 2.5kg/cm<2>, and fuel is injected to the intake pipe 6 at the pressure difference about 2.5kg/cm<2> with the atmosphere despite pressure in the intake pipe 6.

Inventors

• 👤 Toshihiko Ito
• 👤 猪頭　敏彦
• 👤 Takeshi Nomura
• 👤 健 野村
• 👤 Hisashi Kawai
• 👤 寿 河合
• 👤 Toshikazu Ina
• 👤 伊奈　敏和
• 👤 「よし」田　政一
• 👤 Masaichi Yoshida
• 👤 Takao Komoda
• 👤 孝夫 菰田
• 👤 Makio Hamanishi
• 👤 浜西　万亀夫

Bibliographic Details