Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Hitachi Powdered Metals Co., Ltd.

Hayato Matsuda

Tomoki Fukushima

Shinichi Katsuragawa

Yoshinori Maekawa

Takashi Hashizume

Shigeru Saito

Keiichiro Bungo

Takao Tamechika

Soji Kashima

Takashi Suzuki

Hiroshi Mizuguchi

Hiroshi Kobayashi

Hideo Shikata

Sei Watanabe

Hideo Urata

Teruyuki Saitoh

Hideo Shigedomi

Tadayuki Yoneyama

Hiroko Murakami

Yasuhide Ono

Takeshi Fukawa

Jun-ichi Ichikawa

In an apparatus for controlling an air/fuel ratio of a general-purpose internal combustion engine using mixed fuel containing alcohol and gasoline and operated at a desired engine speed inputted by the operator while a throttle opening is regulated such that a detected engine speed converges to the inputted desired engine speed, a fuel injection amount determined for mixed fuel based on fuel injection amount characteristics is increased/decreased when a load is kept constant and the output air/fuel ratio is estimated to correct the fuel injection amount by the estimated air/fuel ratio, while a switch (knob) is installed to be manipulated by the operator to switch the fuel injection amount characteristics.

Air/fuel ratio control apparatus for general-purpose engine

An engine working machine that has an electronically controlled fuel injection system and a fuel tank disposed in an upper portion. The capacity of the fuel tank is effectively used and a complex structure is prevented while reducing the length of the fuel piping. An engine is disposed in a lower portion, and a fuel tank is disposed above the engine. A fuel pump is mounted on a bottom outside surface of the fuel tank, and disposed projecting on a side portion of the crankcase. An extended box is provided on a bottom surface of the fuel tank, and the fuel pump is mounted with a filter and a fuel intake port located inside the extended box. The fuel pump is housed in a pump case that is fixed to a bottom surface of the extended box.

Engine working machine

In an apparatus for controlling an air/fuel ratio of a general-purpose internal combustion engine using mixed fuel containing alcohol and gasoline and operated at a desired engine speed inputted by the operator while a throttle opening is regulated such that a detected engine speed converges to the inputted desired engine speed, a fuel injection amount prepared for mixed fuel is increased/decreased when a load is kept constant and the output air/fuel ratio (at which an output of the engine becomes maximum) is estimated. A rate of alcohol contained in the fuel is estimated from the estimated air/fuel ratio and the fuel injection amount is corrected based on the estimated alcohol rate, thereby determining the fuel injection amount appropriately in accordance with the estimated alcohol rate.

An electronic control system for a carburetor, includes: a transmission device linked to a valve; an electric actuator for driving the valve; and an electronic control unit for controlling operation of the electric actuator, the electric actuator being disposed between the transmission device and the electronic control unit, The transmission device, the electric actuator and the electronic control unit are housed and held in a casing mounted on the carburetor. A ventilation apparatus which places an interior of the casing in communication with an outside atmosphere relative to the carburetor is connected to the casing.

Electronic control system for carburetor

In a blowby gas treatment system for a multiple cylinder engine, in which: a first cylinder and a second cylinder are provided to the engine; a first fuel supply device that always operates during operation of the engine is connected to the first cylinder; and a second fuel supply device that is capable of stopping an operation thereof during the operation of the engine is connected to the second cylinder, first and second branch pipes of an intake manifold are connected to the first and second cylinders, and a blowby gas outlet of a breather chamber and a blowby gas inlet opening into the first branch pipe communicate with each other via a breather pipe, the breather chamber collecting a blowby gas of the engine. Accordingly, when any of the cylinders is stopped, it is possible to easily prevent a blowby gas from flowing toward the stopped cylinder.

Blowby gas treatment system for multiple cylinder engine

In an intake control system for a general-purpose engine, comprising: a motor which is attached to a first side wall, supporting one end portion of a valve shaft of a throttle valve, of a throttle body, and which drives the throttle valve to be opened and closed; a sensor unit which is attached to a second side wall supporting the other end portion of the valve shaft, and which detects an opening degree of the throttle valve; a fuel injection valve which is attached to a third side wall integrally connecting upper end portions of the first and second side walls to each other, and through which a fuel is injected into the intake path at a position downstream of the throttle valve; and an electronic control unit which is attached to a fourth side wall facing the third side wall, the electronic control unit is connected to the motor, the fuel injection valve and the sensor unit with first, second and third conducting wires, respectively. Accordingly, it is possible to allow significant shortening of wires, which electrically connect intake control elements to each other, by completing the wiring only around the throttle body.

Intake control system for general-purpose engine

In a system for controlling a general-purpose air-cooled internal combustion engine having two cylinders each equipped with a throttle valve and a fuel injector, and a cooling fan that selectively directs air onto the cylinders, a throttle driver selectively drives the respective throttle valve of each cylinder to open or close. The system also includes an injector driver that selectively drives the respective injector of each cylinder to open, and a controller that controls operation of the throttle driver and injector driver in such a way that the throttle opening and an amount of fuel to be injected are different for each cylinder, such that an engine speed becomes substantially constant, thereby enabling the engine to obtain desired output characteristics.

Control system for general-purpose engine

A fuel injection control system corrects the amount of fuel injected by fuel injection valves toward an increased side when an acceleration state resulting from operation of a throttle occurs. A control unit includes a detector, an acceleration state determinor, and an acceleration corrector. When an increase in the detected value is a predetermined value or more within a first predetermined time period, the acceleration state determiner determines that a state is an acceleration state and inputs a signal inducing fuel-amount-increase correction to the acceleration corrector. When the state where an amount of change in the detected value reaches a predetermined value or more in an increasing or decreasing direction within a first predetermined time period continuously occurs a predetermined number of times or more before a second predetermined time period expires, determination of the acceleration state is stopped until a third predetermined time period passes.

Fuel injection quantity control system for general-purpose engine

In a lawnmower engine speed control system having an actuator moving a throttle valve and a controller controlling operation of the actuator such that the engine speed becomes equal to a predefined desired engine speed, it is determined whether the lawnmower is under a mowing operation based on a value indicative of a load of the engine including an operation rate or output of the engine, the desired engine speed is changed based on a result of determination, thereby enabling to lower noise, to boost fuel efficiency, and to simplify operation by making manual regulation of engine speed unnecessary, while ensuring stable operation free from engine speed variance.

Speed control system for lawnmower engine

In an engine speed control system mounted on a walk-behind truck having a bed that carries cargo, to power driven wheels through a clutch such that the truck runs and the engine speed is controlled to a desired engine speed, it is detected whether the operator performs operation for disengaging the clutch or for turning the truck, and the desired engine speed is determined to a first value when the operator does not perform any of the operations, while determining it to a second value (lower than the first value) when the operator performs the clutch disengaging or truck turning operation, thereby preventing lurching and sharp turning, protecting cargo against being damaged and falling off, and minimizing fuel consumption and noise.

Engine speed control system for walk-behind truck

In an engine control system mounted on a machine such as a walk-behind truck through a CVT and having an actuator whose operation is controlled such that a detected engine speed becomes equal to a desired engine speed, the output of the engine is estimated based on the detected engine speed and a detected throttle opening, the desired engine speed is changed when the estimated engine output is greater or smaller than output threshold values, and a speed reduction ratio of the CVT is also changed based on the detected engine speed such that a detected speed of the CVT output shaft speed becomes equal to a desired output shaft speed, thereby enabling to reduce the fuel consumption and noise of the engine.

Engine control system

A carburetor choke valve electronic control system includes: a transmission device coupled to a choke valve for opening and closing an intake path of a carburetor; an electric motor for driving the choke valve to be opened and closed via the transmission device; and an electronic control unit for controlling operation of the electric motor. The system further includes: a casing mounted on one side of the carburetor, and housing the transmission device and the electric motor; an operating lever disposed outside the casing; and a choke valve forced closure mechanism that allows the transmission device to be operated in a direction that closes the choke valve by operation of the operating lever.

Carburetor choke valve electronic control system

An electrically-operated automatic choke system of a carburetor includes a choke valve connected to a choke valve closure spring that urges the choke valve in a direction to close it. A wax-type temperature sensitive actuating device is coupled to the carburetor to receive heat generated by an engine. A piston member of the device faces a pivoting member coupled to the choke valve and makes contact with, or moves away from, the pivoting member on a pivoting path to the closed side of the choke valve. While the engine has stopped running, closure of the choke valve by the choke valve closure spring is restricted according to the amount the piston member protrudes.

Carburetor electrically-operated automatic choke system

In a control system of a lawn mower having an internal combustion engine controlled to a desired engine speed by a throttle actuator, a blade connected to the engine to be driven to cut grass, an engine output is estimated based on a detected throttle position and the desired engine speed, and when the estimated engine output exceeds a prescribed value, the grass bag is determined to be full of cut grass. With this, a full grass bag can be detected and the operator informed without providing a dedicated sensor. In addition, a blade switch that inputs a drive instruction to drive the blade and a running switch that inputs a running instruction to propel the lawn mower are provided, and the desired engine speed is set to a first speed when neither the drive instruction nor the running instruction is inputted, but is changed immediately to a second speed, set higher than the first speed, when the drive instruction is inputted, or is changed to the second speed gradually, when the running instruction is inputted, whereby fuel efficiency and operability are improved.

Lawn mower control system

In an engine output condition informing system for a snow remover, the engine speed and the throttle position are detected, the output power rate OPrate of the engine is estimated based thereon, the output power condition of the engine is determined based on the estimated output power rate, and the operator is informed of the determined output power condition by the display (informing) device. With this, the output power condition of the engine can be accurately determined and the operator informed with a simple configuration, whereby the burden on the operator can be lightened. Also, it is possible to minimize situations in which the output power condition of the engine is overpowered and the power train of the engine or of the snow removal mechanism and travel mechanism is damaged, as well as situations in which the output power condition of the engine becomes underpowered, the snow remover is unable to perform, and the operating efficiency decreases.

Growing community of inventors

Wako, Japan

Hayato Matsuda