Toyota Jidosha Kogyo Kabushiki Kaisha

Nippondenso Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Nippon Soken, Inc.

Hiroshi Sami

Nobuhito Hobo

Osamu Ito

Tatehito Ueda

Shizuo Kawai

Teruo Kumai

Kaoru Taira

Takeshi Takahashi

Takashi Yamamoto

Kazuma Matsui

Yoshihiko Tsuzuki

Satoshi Haseda

Tetsuya Nakamura

Jun Tarui

Makoto Shiozaki

Etsuji Nomura

Yukinori Miyata

Takashi Naitou

Toshikuni Miyazaki

Teruo Nishio

Takehito Ueda

A unit injector comprising a plunger, a high pressure fuel chamber, and a needle; the pressure of fuel in the high pressure fuel chamber being increased by the plunger. A spill valve is slidably inserted into a bore and is actuated by an actuator. The spill valve has a first annular fitting portion in tight contact with the inner wall of the bore at one end thereof, and has a second annular fitting portion in tight contact with the inner wall of the bore at the other end thereof. The bore has an annular valve seat formed on the wall thereof, and the spill valve has an annular valve portion between the first annular fitting portion and the second annular fitting portion. A high pressure fuel introduction chamber is formed around the spill valve between the first annular fitting portion and the annular valve portion and is continuously connected to the high pressure fuel chamber. A fuel spill chamber is formed around the spill valve between the second annular fitting portion and the annular valve portion, and when the annular valve portion is moved away from the annular valve seat, fuel under a high pressure is spilled out from the high pressure fuel chamber into the fuel spill and the fuel injection is stopped.

Fuel injection device

The intake pressure and temperature of a Diesel engine equipped with a supercharger are sensed and the sensed intake pressure value is divided by the sensed intake temperature value to obtain an intake density. A value indicative of the intake density is divided by a value indicative of the air-excess ratio computed in accordance with the operating condition of the engine producing a smoke-limit injection amount. The smoke-limit injection amount is compared with the injection amount corresponding to a part-load condition of the engine and the smaller one of the values is applied to a linear solenoid for controlling the fuel injection amount adjusting member in the fuel injection pump of the engine.

Electric control apparatus for a fuel injection pump

An electric control apparatus for a fuel injection pump comprises a fuel flow sensor for detecting the net quantity of fuel supplied to the fuel injection pump, operating condition sensors for detecting operating condition parameters of an engine, a servo device for driving a fuel injection quantity controlling element of the fuel injection pump which controls the fuel injection quantity of the fuel injection pump, and an electric control circuit for receiving detection signals from the fuel flow sensor and the operating condition sensors, computing the actual fuel injection quantity and the desired fuel injection quantity, and determining an error between the computed actual fuel injection quantity and desired fuel injection quantity to drive the fuel injection quantity controlling element of the fuel injection pump through the servo device in accordance with an error representing signal, thereby controlling the actual fuel injection quantity at the desired fuel injection quantity. By ensuring high detection accuracy of the fuel flow sensor, it is possible to accomplish high precision control of the fuel injection quantity without utilizing the position of a moving part of the fuel injection quantity controlling element of the fuel injection pump.

Electric control apparatus for fuel injection pumps

An electrical governor for a fuel injection pump with a spill ring comprises an acceleration pedal operating amount (PA) detector, an engine rotational speed (N) detector, a spill ring displacement detector, a maximum limit injection amount pattern memory for storing the relation between the engine rotational speed (N) and the maximum smoke concentration generating injection amount (Qmax), a partial load injection amount pattern memory for storing the relation between the rotational speed (N) and the partial load injection amount (Qpar) corresponding to the acceleration pedal operating amount (PA) with the acceleration pedal operating amount (PA) as a parameter, a minimum limit injection amount pattern memory for storing the relation between the rotational speed (N) and the minimum limit injection amount (Qmin), a target position pattern memory for storing the relation between the target injection amount (Qf) and the spill ring displacement target position (V.sub.SN), microcomputer means for reading out the values Qmin, Qpar and Qmax for the detected values PA and N and calculating the values Qf' and V.sub.SN ' corresponding to the detected values PA and N by interpolation, and actuator drive means for correcting the spill ring displacement in accordance with the calculated target position V.sub.SN ', thereby correcting the change in the fuel injection amount caused by the change in rotational speed. The governor alternatively includes a target position pattern memory for storing the relation between the values PA, N and V.sub.SN for a corresponding value Qf.

Electrical fuel injection pump governor

In an internal combustion engine equipped with a fuel injection pump which has a movable fuel amount determining element, the position of which determines the amount of fuel provided for injection by the fuel injection pump, a pressure regulating valve is disclosed which is coupled to the movement of the movable fuel amount determining element and which provides an output fluid pressure which represents the position of this element, and therefore represents the load on the engine. The valve comprises a fixed orifice supplied with a constant fluid pressure, a fluid passage downstream of the fixed orifice, a pressure takeoff passage branching from the fluid passage, and a variable orifice downstream of the fluid passage whose effective opening area is varied according to the movement of the fuel amount determining element. Fluid flows from the upstream side of the fixed orifice through it, through the fluid passage, and through the variable orifice, in that order, the pressure of fluid at the point where the pressure takeoff passage branches from the fluid passage varying according to the position of the fuel amount determining element.

Fuel injection amount - fluid pressure conversion system

An exhaust-gas-recirculation system for use in diesel engines, having a valve member adapted to control the flow rate of the exhaust gas recirculated from the exhaust pipe to the intake pipe of the diesel engine. The exhaust-gas-recirculation system has a fly-weight rotatable in synchronization with the engine to produce a centrifugal force, a governor sleeve displaceable in response to a thrust thereon given by the fly-weight, a control spring counteracting the thrust on the governor sleeve and having a spring load changeable in response to the change in the amount of depression of an accelerator pedal, and an actuator operative in response to the displacement of the governor sleeve to actuate the valve member.

Exhaust-gas-recirculation system for use in diesel engines

Disclosed herein is an exhaust gas recirculation control valve for a diesel engine. The valve comprises a valve casing, disposed in the intake line of the engine, of a rectangular cross sectional shape. A valve seat connected to an exhaust line of the engine via an EGR passageway is formed in a side wall of the rectangular shaped valve casing. A valve member of a plate shape is arranged in the casing and is rotated about an axis located upstream of the valve seat in such a manner that the valve member is moved between a position wherein the plate closes the valve seat and another position wherein the plate closes the intake passageway. The valve device is operated by an actuator means including a vacuum actuator connected to the valve plate and a vacuum generator which transmits a vacuum signal into the actuator in accordance with the load of the engine.

Exhaust gas recirculation for a diesel engine

A carburetor equipped with a cooling system composed of cooling fluid passages incorporated in the carburetor flange and/or heat insulator mounted below the flange portion, said cooling system being supplied with cooling fluid only for a predetermined duration from the instant of opening the ignition switch to protect the carburetor casing from being overheated by an intake manifold incorporating exhaust gas heating.

Carburetor equipped with a cooling system

Apparatus for heating an intake manifold in an internal combustion engine comprising a heating chamber for heating an intake manifold, arranged below a riser portion of the latter and communicated with the inside of an exhaust reactor; a by-pass for the exhaust gas provided in the reactor, the upstream end thereof opening into said heating chamber and the downstream end opening into a passage connecting the inside of the reactor to an exhaust pipe; and control valve means provided in said passage adjacent to the downstream end of the by-pass to alternatively divert the flow route of the exhaust gas.

Apparatus for heating an intake manifold in an internal combustion engine

A thermal reactor for an internal combustion engine wherein when the temperature of the engine is low, exhaust gas exhausted from the engine is reacted in an inner core before it is mixed with secondary air and then guided to a riser member where it is heat-exchanged with intake gas mixture and thereafter exhausted through a bypass passage, and when the temperature of the engine is moderate to high the exhaust gas is mixed in the inner core with the secondary air introduced into the inner core through the vicinity of the riser member, whereby unburnt component in the exhaust gas is burnt and exhausted.

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Numazu, Japan

Hiroshi Sami