Toyota Jidosha Kabushiki Kaisha

Nippondenso Co., Ltd.

Toyota Jidosha Kogyo Kabushiki Kaisha

Nippon Soken, Inc.

Hiroshi Koide

Kazuo Shinoda

Masahiko Miyaki

Toshihiko Igashira

Yasuyuki Sakakibara

Seiko Abe

Yoshihiko Tsuzuki

Nobuhito Hobo

Akira Masuda

Fumiaki Kobayashi

Toshiaki Konomi

Yoshimune Konishi

Noritaka Ibuki

Takio Tani

Narutoshi Kameoka

Atsusi Taguchi

A high-pressure fluid control solenoid valve assembly for use with a spill type fuel injection pump of an internal combustion engine, comprises an actuator portion (101) including a solenoid (8, 9), a stator (7) and an armature (14), and a valve portion (102) including a pilot valve (40, 41) and a main valve (42, 43) where the valve portion (102) is spaced apart from the actuator portion (101) and is responsive to the movement of the armature (14) via a rod (14) connected to the armature (14) and extends axially in a bore of the stator (7) which is cylindrical hollow. The pilot valve (40, 41) is coaxial with and telescopically received in the main valve (42, 43) so that two fluid chambers (54, 51) are formed inside and outside, respectively a spool (42) of the main valve such that the main valve is continuously kept closed irrespective of the fluid pressure in these chambers as long as the pilot valve is closed. The pilot valve comprises a needle (40) which is arranged to be pressed by the rod (13) to close the pilot valve on energization of the solenoid (8, 9), where the needle (40) is normally biased in valve-opening direction. On deenergization, the pilot valve opens causing the main valve to spill fuel thus terminating the fuel injection.

High-pressure fluid control solenoid valve assembly with coaxially

Disclosed is a fuel injection quantity control system incorporated with a fuel injection pump with a solenoid-operated spill valve wherein a control signal is generated for cutting off a fuel supply to engine cylinders when a rotational phase angle of a drive shaft of the fuel injection pump is coincident with a desired spill phase angle determined in accordance with engine operating conditions. The desired spill phase angle, i.e., the opening timing of the spill valve is controlled in accordance with the rotational variations of the fuel injection pump. The desired spill phase angle is divided by unit angle corresponding to a detection period of rotational angle signals produced in accordance with the rotation of the pump drive shaft, obtaining a quotient and a remainder angle. The remainder angle is converted into a time on the basis of an engine speed. The generation of the control signal basically occurs upon the elapse of the converted time after the count of rotational angle signals is coincident with the quotient. If the engine operating condition varies immediately prior to the coincidence therebetween, the control signal is generated immediately after the coincidence or upon the elapse of a predetermined time period thereafter.

Method and apparatus for controlling fuel injection quantity into a

In a fuel injection apparatus for an internal combustion engine, the fuel injection is ended by a spill mechanism provided in a spill passage communicating with a pumping chamber. A piston opening and closing the spill passage is a free piston, and a solenoid valve to open and close a cylinder in which the free piston is disposed, is also provided. As the solenoid valve closes the cylinder, the free piston closes the spill passage, thus enabling the fuel feed to the fuel injection valve. When the solenoid valve opens the cylinder, the free piston opens the spill passage. Thus, the fuel flows through the spill passage to the fuel reservoir.

Fuel injection apparatus

A fuel injection pump of the distribution type is provided with an electromagnetic valve for escaping the fuel in the pump chamber of the fuel injection pump. The fuel injection pump is also provided with a sensor for detecting the rotary angle of a pump shaft. This sensor is attached to a roller ring of a converter mechanism which also comprises a face cam, for example, and which also serves to convert the rotation of the pump shaft the reciprocate with that of a pump plunger. The sensor generates signals which represent the rotary angles of the pump shaft. The operation of the electromagnetic valve is controlled to escape the fuel in the pump chamber, depending upon the signals supplied from the sensor.

Fuel injection pump of the distributor type

An apparatus for supplying cooled fuel to the fuel injection valves of a fuel injected internal combustion engine. In the engine, there is a distribution tube having a fuel passage for fuel and a coolant passage for a cooling medium such as water or air. The fuel passage is provided in close proximity to the coolant passage, whereby the fuel in the fuel passage is cooled by the coolant in the coolant passage. Consequently, the cooled fuel is supplied to fuel injection valves.

Apparatus for supplying cooled fuel to an engine

An air-fuel ratio adjusting device in an internal combustion engine having a carburetor, comprising an oxygen sensor whereby oxygen concentration in the exhaust gas is detected and control means whereby the detected oxygen concentration is compared with the air-fuel ratio in the mixture and an output signal corresponding to the difference therebetween is produced, the output signal being applied to an electromagnetic fuel injection system provided in the carburetor. A regulator is provided between the main fuel supply system and the electromagnetic fuel injection system in the carburetor. Also, a cold start nozzle which is controlled on engine starting is provided in the intake system.

Air-fuel ratio adjusting device in an internal combustion engine having

An air-fuel ratio control device for internal combustion engines including a passage having air for adjusting the air-fuel ratio and which flows into an intake manifold disposed downstream of the carburetor, and a control valve in the passage, the control valve having two operating mechanisms for controlling the open area of the valve, one of the operating mechanisms being controlled in response to the throttle valve opening and the other operating mechanism being controlled in response to the exhaust gas composition.

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Okazaki, Japan

Hiroshi Koide